AMT / American Tower Corporation - SEC-Einreichungen, Jahresbericht, Proxy Statement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2026 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2026 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 27, 2026 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 27, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee U.S. Bank Europe DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 2 Dated as of May 27, 2026 BASE INDENTURE Dated as of June 2, 2025 €750,000,000 Principal A

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and U.S. Bank Europe DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 2 Dated as of May 27, 2026 to BASE INDENTURE Dated as of June 2, 2025 €750,000,000 Principal Amount €750,000,000 4.000% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

As filed with the Securities and Exchange Commission on May 26, 2026

S-8 As filed with the Securities and Exchange Commission on May 26, 2026 Registration No.

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 AMERICAN TOWER CORP /MA/ Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Common stock, par value $0.

AMERICAN TOWER CORPORATION 2026 EQUITY INCENTIVE PLAN

Exhibit 10.1 AMERICAN TOWER CORPORATION 2026 EQUITY INCENTIVE PLAN 1.Purpose. The purpose of the American Tower Corporation 2026 Equity Incentive Plan is to provide a means through which the Company and the other members of the Company Group may attract and retain key personnel and to provide a means whereby directors, officers, employees, consultants and advisors of the Company and the other memb

Terms of Restricted Stock Units

Exhibit 10.2 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Employee / Time) American Tower Corporation ID: 65-0723837 222 Berkeley Street Boston, MA 02116 Administrator 222 Berkeley Street Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), pursuant to its 2026 Equity Inc

Terms of Restricted Stock Units

Exhibit 10.4 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Executive / Time) American Tower Corporation ID: 65-0723837 222 Berkeley Street Boston, MA 02116 Administrator 222 Berkeley Street Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), pursuant to its 2026 Equity In

Terms of Restricted Stock Units

Exhibit 10.5 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-Employee Director / Time) American Tower Corporation ID: 65-0723837 222 Berkeley Street Boston, MA 02116 Administrator 222 Berkeley Street Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), pursuant to its 20

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — May 21, 2026 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.79 per share on shares of the Company’s common stock. The distributio

Terms of Performance-Based Restricted Stock Units

Exhibit 10.6 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (Executive / Performance) American Tower Corporation ID: 65-0723837 222 Berkeley Street Boston, MA 02116 Administrator 222 Berkeley Street Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), pursu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 20, 2026 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 20, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Terms of Restricted Stock Units for Non-U.S. Participants

Exhibit 10.3 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement for Non-U.S. Participants (Employee / Time) American Tower Corporation ID: 65-0723837 222 Berkeley Street Boston, MA 02116 Administrator 222 Berkeley Street Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), pursu

Security Type

Calculation of Filing Fee Tables S-3 AMERICAN TOWER CORP /MA/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation €750,000,000 4.000% Senior Notes due 2033

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-287714 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 €750,000,000 American Tower Corporation €750,000,000 4.000% Senior Notes due 2033 We are offering €750,000,000 of 4.000% Senior Notes due 2033 (the “notes”). We will pay cash interest on the notes on September 1 of each year, beginning on September 1, 2026. Th

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 19, 2026 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2033 in an aggregate principal amount of €750.0 million (approximately

SUBJECT TO COMPLETION, DATED MAY 19, 2026. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation €    % Senior Notes due 2033

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-287714 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 19, 2026. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 €    American Tower Corporation €    % Senior

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 19, 2026 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 19, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Final Term Sheet AMERICAN TOWER CORPORATION May 19, 2026 Issuer: American Tower Corporation (“AMT”) Coupon: 4.000% Senior Notes due 2033 Principal Amount: €750,000,000 Maturity Date: September 1, 2033 Offering Format: SEC registered (Registration No.

FWP Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 7, 2026 AMERICAN TOWER CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 7, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2026 FINANCIAL RESULTS

Exhibit 99.1 Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2026 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS First Quarter 2026 ● Total revenue increased 6.8% to $2,738 million ● Total property revenue increased 7.3% to $2,670 million ● Net income increased 76.2% to $879 million(1)(2) ● Adjusted EBITDA increa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2026. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 28, 2026 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 28, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

ARS

2025 Annual Report2 | American Tower Corporation Corporate PŋĬƌĞê Founded in 1995, American Tower is one of the largest global real estate investment trusts (REITs) and a leading independent owner, operator and developer of multitenant communications real estate.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 6, 2026 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 6, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 5, 2026 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 5, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — March 5, 2026 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.79 per share on shares of the Company’s common stock. The distributi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 25, 2026 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 25, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Anti-Insider Trading Policy

Exhibit 19.1 Anti-Insider Trading Policy 1. Purpose This policy provides all Company Persons and Directors with the restrictions and necessary guidelines for anti-insider trading. Superseding all established and existing company guidelines and/or policies and procedures on anti-insider restrictions, this policy is effective January 1, 2003 and remains in effect subject to any amendments or restate

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2025 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Fourth Quarter 2025 Full Year 2025 ● Total revenue increased 7.5% to $2,738 million(3) ● Total revenue increased 5.1% to $10,645 million(3) ● Total property revenue increased 7.6%

AMERICAN TOWER CORPORATION COMPENSATION RECOVERY POLICY

Exhibit 97 AMERICAN TOWER CORPORATION COMPENSATION RECOVERY POLICY 1.Purpose. This Policy (defined in Section 3) describes the circumstances in which each Executive Officer (defined in Section 3) must repay or return Erroneously Awarded Compensation (defined in Section 3) to members of the Company Group (defined in Section 3) in accordance with the Clawback Rules (defined in Section 3). Each Execu

SUBSIDIARIES OF AMERICAN TOWER CORPORATION

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware Adquisiciones y Proyectos Inalámbricos, S.

January 23, 2026

Exhibit 10.32 January 23, 2026 Paul Blanchett Dear Paul: I am pleased to confirm our offer to join American Tower Corporation (“American Tower” or the “Company”) as a Senior Vice President, Chief Accounting Officer in the Corporate Boston Finance organization, reporting to Rod Smith. This employment offer is contingent upon American Tower reviewing and approving, at its sole discretion, the result

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

Exhibit 4.35 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 17, 2026, American Tower Corporation has 14 classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.950% senior notes due 2026 (the “1.950% Notes”); (3) our

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 24, 2026 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 24, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 26, 2026 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 26, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 28, 2026 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 28, 2026 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2025 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 1 Dated as of December 5, 2025 BASE INDENTURE Dated as of June 2, 2025 $850,000,000 Principal Amount $850,000,000 4.700% SENIOR NOTES DUE 2

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 1 Dated as of December 5, 2025 to BASE INDENTURE Dated as of June 2, 2025 $850,000,000 Principal Amount $850,000,000 4.700% SENIOR NOTES DUE 2032 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.01. Definitions 1 Section 1.02.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 4, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 4, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — December 4, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distrib

Security Type

Calculation of Filing Fee Tables S-3 AMERICAN TOWER CORP /MA/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation $850,000,000 4.700% Senior Notes due 2032

424B2 Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-287714 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 $850,000,000 American Tower Corporation $850,000,000 4.700% Senior Notes due 2032 We are offering $850,000,000 of 4.700% Senior Notes due 2032 (the “notes”). We will pay cash interest on the notes on June 15 and December 15 of each year, beginning on June 15, 2026

Final Term Sheet AMERICAN TOWER CORPORATION December 2, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 4.700% Senior Notes due 2032 Principal Amount: $850,000,000 Maturity Date: December 15, 2032 Benchmark Treasury: 3.750% due November 30, 2

FWP Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 2, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 2, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

SUBJECT TO COMPLETION, DATED DECEMBER 2, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation $     % Senior Notes due 2032

424B5 Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-287714 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED DECEMBER 2, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 $    American Tower Corporation $     % Senio

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - December 2, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2032 in an aggregate principal amount of $850.0 million. The 20

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 5, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 5, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2025. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 28, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 28, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Third Quarter 2025 ● Total revenue increased 7.7% to $2,717 million(3) ● Total property revenue increased 5.9% to $2,616 million(3) ● Net income increased 216.9% to $913 million, primarily due to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 23, 2025 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 23, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 16, 2025 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 16, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — September 18, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distr

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 16, 2025 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 16, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissi

Security Type

Calculation of Filing Fee Tables S-3 AMERICAN TOWER CORP /MA/ Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation $200,000,000 4.900% Senior Notes due 2030 $375,000,000 5.350% Senior Notes due 2035

424B2 Filed Pursuant to Rule 424B2 Registration No. 333-287714 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 $575,000,000 American Tower Corporation $200,000,000 4.900% Senior Notes due 2030 $375,000,000 5.350% Senior Notes due 2035 We are offering $200,000,000 of 4.900% Senior Notes due 2030 (the “2030 notes”) and $375,000,000 of 5.350% Senior Notes due 2035 (the “2035 notes” and, togeth

AMERICAN TOWER CORPORATION September 11, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 4.900% Senior Notes due 2030 (the “2030 Notes”) 5.350% Senior Notes due 2035 (the “2035 Notes”) Principal Amount: 2030 Notes: $200,000,000 (which will be

FWP Final Term Sheet Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 11, 2025 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 11, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - September 11, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2035 in aggregate principal amounts of $200.0 millio

SUBJECT TO COMPLETION, DATED SEPTEMBER 11, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 2, 2025 American Tower Corporation $      4.900% Senior Notes due 2030 $      5.350% Senior Notes due 2035

424B5 Table of Contents This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 3, 2025 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 3, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 22, 2025 AMERICAN TOWER COR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 22, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF GENE REILLY TO BOARD OF DIRECTORS

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF GENE REILLY TO BOARD OF DIRECTORS Boston, Massachusetts – August 25, 2025 – American Tower Corporation (NYSE: AMT) announced that its Board of Directors has elected Gene Reilly as a director. Mr. Reilly most recently served as the Vice Chairman

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2025. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Kate Reeb Senior Director, Investor Relations Telephone: (617) 375-7565 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Second Quarter 2025 ● Total revenue increased 3.2% to $2,627 million(3) ● Total property revenue increased 1.2% to $2,527 million(3) ● Net income decreased 58.1% to $381 million, primarily due to foreign

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 29, 2025 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 29, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Form of Subordinated Indenture between American Tower Corporation and U.S. Bank National Association, as Trustee.

EX-4.36 Exhibit 4.36 AMERICAN TOWER CORPORATION SUBORDINATED INDENTURE Dated as of [    ], 20[ ] [ ] Trustee Article I DEFINITIONS 6 SECTION 1.01. Certain Terms Defined 6 Article II SECURITY FORMS 10 SECTION 2.01. Forms Generally 10 SECTION 2.02. Form of Trustee’s Certificate of Authentication 10 Article III ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 11 SECTION 3.01. Amount Unlimited; I

As filed with the Securities and Exchange Commission on June 2, 2025.

Table of Contents As filed with the Securities and Exchange Commission on June 2, 2025.

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of U.S. Bank Trust Company, National Association, as trustee under the Indenture dated June 2, 2025.

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

Filing Fee Exhibit

EXHIBIT 107 Calculation of Filing Fee Table FORM S-3 (Form Type) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee  Rate  Amount of Registration Fee Carry Forward  Form Type Carry Forward  File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Equity  Common Stock, par value $0.

Indenture dated as of June 2, 2025, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee.

Exhibit 4.34 AMERICAN TOWER CORPORATION INDENTURE Dated as of June 2, 2025 U.S. Bank Trust Company, National Association Trustee ARTICLE 1 DEFINITIONS 1 SECTION 1.01 Certain Terms Defined 1 ARTICLE 2 SECURITY FORMS 4 SECTION 2.01 Forms Generally 4 SECTION 2.02 Form of Trustee’s Certificate of Authentication 9 ARTICLE 3 ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 10 SECTION 3.01 Amount Un

NYSE CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com June 2, 2025 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The New York Stock Exchange certifies its approval for listing and registration of the 3.625% senior notes due 2032 of American Tower

Form of Underwriting Agreement for non-convertible debt securities.

Exhibit 1.1 AMERICAN TOWER CORPORATION [Principal Amount / Title of Securities] UNDERWRITING AGREEMENT [Date] To the Representatives of the Several Underwriters named in Schedule A hereto, Dear Ladies and Gentlemen: 1. Introductory. American Tower Corporation, a Delaware corporation (the “Company”), subject to the terms and conditions set forth herein, agrees with the several Underwriters named in

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 30, 2025 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 30, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Supplemental Indenture No. 9, dated as of May 30, 2025, by and among American Tower Corporation, U.S. Bank Trust Company, National Association, as trustee, and U.S. Bank Europe DAC, UK Branch, as paying agent

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and U.S. Bank Europe DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 9 Dated as of May 30, 2025 to BASE INDENTURE Dated as of June 1, 2022 €500,000,000 Principal Amount 3.625% SENIOR NOTES DUE 2032 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.01.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt  3.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €500,000,000 3.625% Senior Notes due 2032

Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €500,000,000 American Tower Corporation €500,000,000 3.625% Senior Notes due 2032 We are offering €500,000,000 of 3.625% Senior Notes due 2032 (the “notes”). We will pay cash interest on the notes on May 30 of each year, beginning on May 30, 2026. The notes will mature on May 30, 203

SUBJECT TO COMPLETION, DATED MAY 21, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €    % Senior Notes due 2032

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 21, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €    American Tower Corporation €    % Senior Notes

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 21, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2032 in an aggregate principal amount of €500.0 million (approxi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 21, 2025 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 21, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Final Term Sheet AMERICAN TOWER CORPORATION May 21, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 3.625% Senior Notes due 2032 Principal Amount: €500,000,000 Maturity Date: May 30, 2032 Offering Format: SEC registered (Registration No. 333-

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 14, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — May 15, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distribu

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) First Quarter 2025 ● Total revenue increased 2.0% to $2,563 million(3) ● Total property revenue increased 0.2% to $2,488 million(3) ● Net income decreased 45.9% to $499 million, primarily

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 29, 2025 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 29, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2025. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

EX-99.25

EX-99.25 2 ruleprovisionnotice.htm NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on April 15, 2025, pursuant to the provisions of Rule 12d2-2 (a). [ X ] 17 CFR 240.12d2-

ARS

AME RIC AN T O WE R CORP OR A TION Annual Report 2024 AME RIC AN T O WE R CORP OR ATION 2024 ANN U AL RE P OR T Building a more connected worldFounded in 1995, American Tower is one of the largest global real estate investment trusts (REITs) and a leading independent owner, operator and developer of multitenant communications real estate.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 17, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 14, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

Supplemental Indenture No. 8, dated as of March 14, 2025, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 8 Dated as of March 14, 2025 to BASE INDENTURE Dated as of June 1, 2022 $1,000,000,000 Principal Amount $650,000,000 4.900% SENIOR NOTES DUE 2030 $350,000,000 5.350% SENIOR NOTES DUE 2035 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1    Sect

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (1) Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt  4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 4.900% Senior Notes due 2030 $350,000,000 5.350% Senior Notes due 2035

424B2 Table of Contents Filed Pursuant to Rule 424b2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,000,000,000 American Tower Corporation $650,000,000 4.900% Senior Notes due 2030 $350,000,000 5.350% Senior Notes due 2035 We are offering $650,000,000 of 4.900% Senior Notes due 2030 (the “2030 notes”) and $350,000,000 of 5.350% Senior Notes due 2035 (the “203

SUBJECT TO COMPLETION, DATED MARCH 11, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2030 $     % Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MARCH 11, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Notes

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - March 11, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2035 in aggregate principal amounts of $650.0 million

Final Term Sheet AMERICAN TOWER CORPORATION March 11, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 4.900% Senior Notes due 2030 (the “2030 Notes”) 5.350% Senior Notes due 2035 (the “2035 Notes”) Principal Amount: 2030 Notes: $650,000,000 2

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 6, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — March 6, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distrib

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 27, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Amendment No. 2 to the Fourth Amended and Restated Revolving Credit Agreement, dated as of January 28, 2025, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Fourth Amended and Restated Revolving Credit Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.39 EXECUTION VERSION AMENDMENT NO. 2 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 2 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and TORONTO

Amendment No. 2 to the Second Amended and Restated Term Loan Agreement, dated as of January 28, 2025, among the Company, as borrower, Mizuho Bank, Ltd., as administrative agent, and a majority of the lenders under the Second Amended and Restated Term Loan Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.42 EXECUTION VERSION AMENDMENT NO. 2 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 2 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and MIZUHO BANK, LTD., as

Subsidiaries of the Company

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware ActiveX Telebroadband Services Private Limited India Adquisiciones y Proyectos Inalámbricos, S.

Letter Agreement, dated as of January 3, 2025, by and between the Company and Eugene M. Noel

Exhibit 10.31 January 3, 2025 Eugene Noel Dear Bud: I am pleased to confirm your promotion to Executive Vice President and Chief Operating Officer of American Tower Corporation (the “Company”) effective January 13, 2025. In this position you will continue to report to Steve Vondran, President and Chief Executive Officer. This is an exempt position, and your new annual rate of base compensation wil

Letter Agreement, dated as of January 3, 2025, by and between the Company and Richard Rossi

Exhibit 10.32 January 3, 2025 Richard Rossi Dear Rich: I am pleased to confirm your promotion to Executive Vice President and President, U.S. Tower of American Tower Corporation (the “Company”) effective January 13, 2025. In this position you will be reporting to Steve Vondran, President and Chief Executive Officer. This is an exempt position, and your new annual rate of base compensation will be

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2024 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 25, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Amendment No. 3 to the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of January 28, 2025, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.36 EXECUTION VERSION AMENDMENT NO. 3 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 3 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”), certain of the Company’s subsidiaries (together with the

American Tower Corporation Anti-Insider Trading Policy

Exhibit 19.1 Anti-Insider Trading Policy 1. Purpose This policy provides all Company Persons and Directors with the restrictions and necessary guidelines for anti-insider trading. Superseding all established and existing company guidelines and/or policies and procedures on anti-insider restrictions, this policy is effective January 1, 2003 and remains in effect subject to any amendments or restate

Description of Registrant’s Securities

Exhibit 4.34 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 18, 2025, American Tower Corporation has 14 classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.375% senior notes due 2025 (the “1.375% Notes”); (3) our

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Fourth Quarter 2024 Full Year 2024 ● Total revenue increased 3.7% to $2,548 million ● Total revenue increased 1.1% to $10,127 million ● Total property revenue increased 2.0%

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF RAJESH KALATHUR TO BOARD OF DIRECTORS

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF RAJESH KALATHUR TO BOARD OF DIRECTORS Boston, Massachusetts – February 5, 2025 – American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) has elected Rajesh (“Raj”) Kalathur as a director. Mr. Kalathur i

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

EX-24

EX-24 2 PowerOfAttorney.txt EXHIBIT 24: POWER OF ATTORNEY POWER OF ATTORNEY The undersigned, BlackRock, Inc., a corporation duly organized under the laws of the State of Delaware, United States (the "Company"), does hereby make, constitute and appoint each of Eric Andruczyk, Richard Cundiff, R. Andrew Dickson, III, Spencer Fleming, Laura Hildner, David Maryles, Christopher Meade, Charles Park, Jam

EX-99

EX-99 3 ITEM7.txt EXHIBIT 99: ITEM 7 BlackRock Life Limited BlackRock International Limited Aperio Group, LLC BlackRock Advisors, LLC BlackRock France SAS BlackRock (Netherlands) B.V. BlackRock Institutional Trust Company, National Association BlackRock Asset Management Ireland Limited BlackRock Financial Management, Inc. BlackRock Japan Co., Ltd. BlackRock Asset Management Schweiz AG BlackRock In

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 28, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 2, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

AMERICAN TOWER NAMES BUD NOEL AS COO AND RICH ROSSI AS EVP AND PRESIDENT, U.S. TOWER

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER NAMES BUD NOEL AS COO AND RICH ROSSI AS EVP AND PRESIDENT, U.S. TOWER Boston, Massachusetts – January 7, 2025 – American Tower Corporation (NYSE: AMT) announced today that Eugene (“Bud”) Noel, currently Executive Vice President and President of the U. S. Tower Division,

Amended and Restated By-Laws of the Company, effective as of January 3, 2025

HTML Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF AMERICAN TOWER CORPORATION (a Delaware Corporation) Effective as of January 3, 2025 AMERICAN TOWER CORPORATION (a Delaware Corporation) AMENDED AND RESTATED BY-LAWS TABLE OF CONTENTS Page ARTICLE I OFFICES 1 SECTION 1. Registered Office 1 SECTION 2. Other Offices 1 ARTICLE II SEAL 1 ARTICLE III MEETINGS OF STOCKHOLDERS 1 SECTION 1. Place of Meeting

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — December 5, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The dist

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2024 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Supplemental Indenture No. 7, dated as of November 21, 2024, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee.

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 7 Dated as of November 21, 2024 to BASE INDENTURE Dated as of June 1, 2022 $1,200,000,000 Principal Amount $600,000,000 5.000% SENIOR NOTES DUE 2030 $600,000,000 5.400% SENIOR NOTES DUE 2035 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Sect

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 21, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $600,000,000 5.000% Senior Notes due 2030 $600,000,000 5.400% Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424b2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,200,000,000 American Tower Corporation $600,000,000 5.000% Senior Notes due 2030 $600,000,000 5.400% Senior Notes due 2035 We are offering $600,000,000 of 5.000% Senior Notes due 2030 (the “2030 notes”) and $600,000,000 of 5.400% Senior Notes due 2035 (the “2035 note

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 18, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Final Term Sheet AMERICAN TOWER CORPORATION November 18, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 5.000% Senior Notes due 2030 (the “2030 Notes”) 5.400% Senior Notes due 2035 (the “2035 Notes”) Principal Amount: 2030 Notes: $600,000,00

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - November 18, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2035 in aggregate principal amounts of $600.0 mill

SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2030 $     % Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Not

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 28, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2024 FINANCIAL RESULTS On September 12, 2024, American Tower Corporation (the “Company” or “American Tower”) completed the sale of 100% of the equity interests in its operations in India (“ATC TIPL” or “ATC India”) to Data Infrastructure Tru

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 29, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — September 12, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The di

AMERICAN TOWER CLOSES THE SALE OF OPERATIONS IN INDIA TO BROOKFIELD

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CLOSES THE SALE OF OPERATIONS IN INDIA TO BROOKFIELD Boston, Massachusetts – September 12, 2024 – American Tower Corporation (NYSE: AMT) (“American Tower”) today announced that it has closed the previously announced sale of 100% of the equity interests in its operations

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 30, 2024 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 30, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Second Quarter 2024(1) ● Total revenue increased 4.6% to $2,900 million ● Property revenue increased 4.6% to $2,853 million ● Net income increased 96.8% to $908 million(2)(3) ● Adjusted EBITDA

Notice of Benchmark Replacement and Amendment No. 2, dated as of June 27, 2024, to the Third Amended and Restated Multicurrency Revolving Credit Agreement, among American Tower Corporation and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated December 8, 2021, as further amended.

Exhibit 10.1 NOTICE OF BENCHMARK REPLACEMENT AND AMENDMENT NO. 2 TO THE CREDIT AGREEMENT Dated as of June 27, 2024 This NOTICE OF BENCHMARK REPLACEMENT AND AMENDMENT NO. 2 TO THE CREDIT AGREEMENT (this “Amendment”) is made between AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”) and TORONTO DOMINION (TEXAS) LLC, as administrative agent (the “Administrative Agent”) under the Credi

NYSE CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com June 3, 2024 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The New York Stock Exchange certifies its approval for listing and registration of the following securities of American Tower Corporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 29, 2024 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 29, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Supplemental Indenture No. 6, dated as of May 29, 2024, by and among American Tower Corporation, U.S. Bank Trust Company, National Association, as trustee, and Elavon Financial Services DAC, UK Branch, as paying agent.

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and Elavon Financial Services DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 6 Dated as of May 29, 2024 to BASE INDENTURE Dated as of June 1, 2022 €1,000,000,000 Principal Amount €500,000,000 3.900% SENIOR NOTES DUE 2030 €500,000,000 4.100% SENIOR NOTES DUE 2034 TABLE OF CONTENTS P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — May 23, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. Th

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered (1) Proposed Maximum Offerin

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee Fees to Be Paid Debt  3.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €500,000,000 3.900% Senior Notes due 2030 €500,000,000 4.100% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €1,000,000,000 American Tower Corporation €500,000,000 3.900% Senior Notes due 2030 €500,000,000 4.100% Senior Notes due 2034 We are offering €500,000,000 of 3.900% Senior Notes due 2030 (the “2030 notes”) and €500,000,000 of 4.100% Senior Notes due 2034 (the “2034

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

SUBJECT TO COMPLETION, DATED MAY 22, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €       American Tower Corporation €     % Senior Notes due 2030 €     % Senior Notes due 2034

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 22, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €       American Tower Corporation €     % Se

Final Term Sheet AMERICAN TOWER CORPORATION May 22, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 3.900% Senior Notes due 2030 (the “2030 Notes”) 4.100% Senior Notes due 2034 (the “2034 Notes”) Principal Amount: 2030 Notes: €500,000,000 203

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 22, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2034 in aggregate principal amounts of €500.0 million (

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS First Quarter 2024 ● Total revenue increased 2.4% to $2,834 million ● Property revenue increased 3.3% to $2,804 million ● Net income increased 192.6% to $922 million(1)(2)(3) ● Adjusted EBITDA i

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 30, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

Notice of Exempt Solicitation

PX14A6G 1 z416146px14a6g.htm Notice of Exempt Solicitation NAME OF REGISTRANT: American Tower Corporation NAME OF PERSONS RELYING ON EXEMPTION: Arjuna Capital ADDRESS OF PERSON RELYING ON EXEMPTION: 13 Elm St. Manchester, MA 01944 WRITTEN MATERIALS: The attached written materials are submitted pursuant to Rule 14a-6(g)(1) (the “Rule”) promulgated under the Securities Exchange Act of 1934,* in conn

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

ARS

20 23 Annual Report AME RIC AN T O WE R CORP OR ATION | ANN U AL RE P OR T | 2023Founded in 1995, American Tower is one of the largest global real estate investment trusts (REITs) and a leading independent owner, operator and developer of multitenant communications real estate.

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning February 28, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.1 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “C

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning February 28, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.2 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (Non-U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (th

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF NEVILLE R. RAY TO BOARD OF DIRECTORS AND DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF NEVILLE R. RAY TO BOARD OF DIRECTORS AND DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — March 14, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) has elected Neville R. Ray as a director. Mr.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2024 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Supplemental Indenture No. 5, dated as of March 7, 2024, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee.

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 5 Dated as of March 7, 2024 to BASE INDENTURE Dated as of June 1, 2022 $1,300,000,000 Principal Amount $650,000,000 5.200% SENIOR NOTES DUE 2029 $650,000,000 5.450% SENIOR NOTES DUE 2034 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 7, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 5.200% Senior Notes due 2029 $650,000,000 5.450% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,300,000,000 American Tower Corporation $650,000,000 5.200% Senior Notes due 2029 $650,000,000 5.450% Senior Notes due 2034 We are offering $650,000,000 of 5.200% Senior Notes due 2029 (the “2029 notes”) and $650,000,000 of 5.450% Senior Notes due 2034 (the “2034 note

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Pr

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 4, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

SUBJECT TO COMPLETION, DATED MARCH 4, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2029 $     % Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MARCH 4, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Notes d

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - March 4, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2029 and 2034 in aggregate principal amounts of $650.0 million and $650.

Final Term Sheet AMERICAN TOWER CORPORATION March 4, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 5.200% Senior Notes due 2029 (the “2029 Notes”) 5.450% Senior Notes due 2034 (the “2034 Notes”) Principal Amount: 2029 Notes: $650,000,000 20

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 28, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

American Tower Corporation Compensation Recovery Policy

Exhibit 97 AMERICAN TOWER CORPORATION COMPENSATION RECOVERY POLICY 1. Purpose. This Policy (defined in Section 3) describes the circumstances in which each Executive Officer (defined in Section 3) must repay or return Erroneously Awarded Compensation (defined in Section 3) to members of the Company Group (defined in Section 3) in accordance with the Clawback Rules (defined in Section 3). Each Exec

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 27, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Description of Registrant’s Securities

Exhibit 4.32 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 20, 2024, American Tower Corporation has ten classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.375% senior notes due 2025 (the “1.375% Notes”); (3) our

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2023 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

Letter Agreement, dated as of February 5, 2024, by and between the Company and Steven O. Vondran

Exhibit 10.31 February 5, 2024 Steven O. Vondran Dear Steve: Congratulations on your promotion to Chief Executive Officer and President effective February 1, 2024. As discussed, your promotion is contingent on a clear background check completed by our external vendor. This is an exempt position, and your new annual rate of base compensation will be $1,000,000. With your promotion, your target bonu

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Fourth Quarter 2023 Full Year 2023 ● Total revenue increased 3.0% to $2,787 million ● Total revenue increased 4.0% to $11,144 million ● Property revenue increased 4.6% to $2,766 million ●

American Tower Corporation Severance Plan, Program for Executive Vice Presidents and Chief Executive Officer, as of January 1, 2024

Exhibit 10.29 AMERICAN TOWER CORPORATION SEVERANCE PLAN PROGRAM FOR EXECUTIVE VICE PRESIDENTS AND CHIEF EXECUTIVE OFFICERS AS OF JANUARY 1, 2024 1. PURPOSE This Program specifies the benefits available to certain employees of American Tower Corporation and its affiliates in the event their job or position is eliminated. This document is a part of the American Tower Corporation Severance Plan, whic

Form of Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning January 1, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.14 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Subsidiaries of the Company

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware ActiveX Telebroadband Services Private Limited India Adquisiciones y Proyectos Inalámbricos, S.

American Tower Corporation Severance Plan, as Amended and Restated, as of January 1, 2024

Exhibit 10.28 AMERICAN TOWER CORPORATION SEVERANCE PLAN First Effective as of March 2, 2009 As Amended and Restated January 1, 2024 ARTICLE 1 PURPOSE 1.1.  Plan Overview: American Tower Corporation (the “Company”) first adopted this American Tower Corporation Severance Plan (the “Severance Plan” or the “Plan”) effective as of March 2, 2009 (the “Original Effective Date”) as part of the American To

Form of Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning January 1, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.15 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby gr

Letter Agreement, dated as of October 25, 2023, by and between the Company and Eugene M. Noel

Exhibit 10.30 October 25, 2023 Eugene Noel Dear Bud: I am pleased to confirm your promotion to Executive Vice President and President, U.S. Tower effective November 1, 2023. In this position you will be reporting to Steve Vondran, Executive Vice President and Chief Operating Officer. This is an exempt position, and your new annual rate of base compensation will be $600,000. Your weekly hours worke

AMT / American Tower Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: American Tower Corp Title of Class of Securities: Common Stock CUSIP Number: 03027X100 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMT / American Tower Corporation / BlackRock Inc. Passive Investment

SC 13G/A 1 us03027x1000012624.txt us03027x1000012624.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 11) AMERICAN TOWER CORP - (Name of Issuer) Common Stock - (Title of Class of Securities) 03027X100 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropriate b

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 4, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

AMERICAN TOWER COMPLETES STRATEGIC REVIEW, ANNOUNCES AGREEMENT TO SELL OPERATIONS IN INDIA TO BROOKFIELD

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER COMPLETES STRATEGIC REVIEW, ANNOUNCES AGREEMENT TO SELL OPERATIONS IN INDIA TO BROOKFIELD Boston, Massachusetts – January 4, 2024 – American Tower Corporation (NYSE: AMT) (“American Tower”) has signed a definitive agreement with Data Infrastructure Trust (“DIT”), an Infrastructur

Amended and Restated By-Laws of the Company, effective as of December 13, 2023

8-K Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF AMERICAN TOWER CORPORATION (a Delaware Corporation) Effective as of December 13, 2023 AMERICAN TOWER CORPORATION (a Delaware Corporation) AMENDED AND RESTATED BY-LAWS TABLE OF CONTENTS Page ARTICLE I OFFICES 1 SECTION 1. Registered Office 1 SECTION 2. Other Offices 1 ARTICLE II SEAL 1 ARTICLE III MEETINGS OF STOCKHOLDERS 1 SECTION 1. Place of Meeting

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - December 14, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The dist

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 13, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Calculation of Filing Fee Table 424(b)(5) & 424(b)(8) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) & 424(b)(8) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate(2) Amount of Registration Fee(2) Fees to Be Paid Debt 5.

EXPLANATORY NOTE

Filed Pursuant to Rule 424B5 and 424B8 Registration No. 333-265348 EXPLANATORY NOTE American Tower Corporation (the “Company”) is making this filing pursuant to Rule 424(b)(5) and Rule 424(b)(8) under the Securities Act of 1933, as amended (the “Securities Act”), as a supplement to its prospectus supplement dated September 12, 2023 to the prospectus dated June 1, 2022 (the “Original Filing”), orig

Form of Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made October 1, 2023 – December 31, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.2 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby gra

Form of Restricted Stock Units Agreement (Non-Employee Director) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.3 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-Employee Director) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.4 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2023. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 26, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Third Quarter 2023 ● Total revenue increased 5.5% to $2,819 million ● Property revenue increased 7.0% to $2,792 million ● Net income decreased 29.6% to $577 million(1)(2) ● Adjusted EBITDA increased 10.4

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.5 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (Non-U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (th

Form of Restricted Stock Units Agreement (U.S. Employee) (For grants made October 1, 2023 – December 31, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.1 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 20, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - September 20, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The dis

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 15, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissi

Supplemental Indenture No. 4, dated as of September 15, 2023, to Indenture dated as of June 1, 2022, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee, for the 5.800% Senior Notes due 2028 and the 5.900% Senior Notes due 2033

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 4 Dated as of September 15, 2023 to BASE INDENTURE Dated as of June 1, 2022 $1,500,000,000 Principal Amount $750,000,000 5.800% SENIOR NOTES DUE 2028 $750,000,000 5.900% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENC

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $750,000,000 5.800% Senior Notes due 2028 $750,000,000 5.900% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,500,000,000 American Tower Corporation $750,000,000 5.800% Senior Notes due 2028 $750,000,000 5.900% Senior Notes due 2033 We are offering $750,000,000 of 5.800% Senior Notes due 2028 (the “2028 notes”) and $750,000,000 of 5.900% Senior Notes due 2033 (the “2033 note

Final Term Sheet AMERICAN TOWER CORPORATION September 12, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 5.800% Senior Notes due 2028 (the “2028 Notes”) 5.900% Senior Notes due 2033 (the “2033 Notes”) Principal Amount: 2028 Notes: $750,000,0

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - September 12, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2028 and 2033 in aggregate principal amounts of $750.0 million and

SUBJECT TO COMPLETION, DATED SEPTEMBER 12, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $ % Senior Notes due 2028 $ % Senior Notes due 2033

424B5 Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED SEPTEMBER 12, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $ American Tower Corporation $ % Senior Not

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2023 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Second Quarter 2023 ● Total revenue increased 3.6% to $2,772 million ● Property revenue increased 4.4% to $2,729 million ● Net income decreased 48.2% to $462 million(1) ● Adjusted EBITDA increased 4.7%

Amendment No. 1 to the Second Amended and Restated Term Loan Agreement, dated as of June 29, 2023, among the Company, as borrower, Mizuho Bank, Ltd., as administrative agent, and a majority of the lenders under the Second Amended and Restated Term Loan Agreement, dated as of December 8, 2021

HTML Exhibit 10.1 Execution Version AMENDMENT NO. 1 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and MIZUHO BANK, LTD., a

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 27, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Amendment No. 1 to the Fourth Amended and Restated Revolving Credit Agreement, dated as of June 29, 2023, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Fourth Amended and Restated Revolving Credit Agreement, dated as of December 8, 2021

HTML Exhibit 10.3 Execution Version AMENDMENT NO. 1 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and TORONT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2023. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

Amendment No. 1 to the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of June 29, 2023, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of December 8, 2021

HTML Exhibit 10.2 Execution Version AMENDMENT NO. 1 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”), certain of the Company’s subsidiaries (together with the

AMERICAN TOWER CORPORATION RELEASES 2022 SUSTAINABILITY REPORT

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION RELEASES 2022 SUSTAINABILITY REPORT Boston, Massachusetts – July 20, 2023 – American Tower Corporation (NYSE: AMT) today announced the release of its 2022 sustainability report, which outlines the Company's sustainability strategy and provides a comprehensive overview

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 20, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 27, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - May 25, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.57 per share on shares of the Company’s common stock. The distribut

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 25, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Supplemental Indenture No. 3, dated as of May 25, 2023, to Indenture dated as of June 1, 2022, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee, for the 5.250% Senior Notes due 2028 and the 5.550% Senior Notes due 2033

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 3 Dated as of May 25, 2023 to BASE INDENTURE Dated as of June 1, 2022 $1,500,000,000 Principal Amount $650,000,000 5.250% SENIOR NOTES DUE 2028 $850,000,000 5.550% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Se

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 24, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.250% Senior Notes due 2028 $650,000,000 99.71

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 5.250% Senior Notes due 2028 $850,000,000 5.550% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,500,000,000 American Tower Corporation $650,000,000 5.250% Senior Notes due 2028 $850,000,000 5.550% Senior Notes due 2033 We are offering $650,000,000 of 5.250% Senior Notes due 2028 (the “2028 notes”) and $850,000,000 of 5.550% Senior Notes due 2033 (the “2033 note

NYSE CERTIFICATION

New York Stock Exchange 11 Wall Street New York, NY 10005 Tel: +1 212.656.3000 nyse.com May 23, 2023 Chief, Information Technology Securities and Exchange Commission Division of Corporate Finance 100 F Street, NE MS 3040 Washington, DC 20549 To whom it may concern: The New York Stock Exchange certifies its approval for listing and registration of the following securities of American Tower Corporat

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Final Term Sheet AMERICAN TOWER CORPORATION May 22, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 5.250% Senior Notes due 2028 (the “2028 Notes”) 5.550% Senior Notes due 2033 (the “2033 Notes”) Principal Amount: 2028 Notes: $650,000,000 203

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 22, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2028 and 2033 in aggregate principal amounts of $650.0 million and $850.0

SUBJECT TO COMPLETION, DATED MAY 22, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $ % Senior Notes due 2028 $ % Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 22, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $ American Tower Corporation $ % Senior Notes due 2028

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 16, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

Supplemental Indenture No. 2, dated as of May 16, 2023, to Indenture dated as of June 1, 2022 by and among the Company, U.S. Bank Trust Company, National Association, as Trustee, and Elavon Financial Services DAC, UK Branch, as Paying Agent, for the 4.125% Senior Notes due 2027 and the 4.625% Senior Notes due 2031

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and Elavon Financial Services DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 2 Dated as of May 16, 2023 to BASE INDENTURE Dated as of June 1, 2022 €1,100,000,000 Principal Amount €600,000,000 4.125% SENIOR NOTES DUE 2027 €500,000,000 4.625% SENIOR NOTES DUE 2031 TABLE OF CONTENTS P

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €600,000,000 4.125% Senior Notes due 2027 €500,000,000 4.625% Senior Notes due 2031

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €1,100,000,000 American Tower Corporation €600,000,000 4.125% Senior Notes due 2027 €500,000,000 4.625% Senior Notes due 2031 We are offering €600,000,000 of 4.125% Senior Notes due 2027 (the “2027 notes”) and €500,000,000 of 4.625% Senior Notes due 2031 (the “2031

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered (1) Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (2) 4.125% Senior Notes due 2027 $660,240,000 9

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered (1) Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (2) 4.

Final Term Sheet AMERICAN TOWER CORPORATION May 9, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 4.125% Senior Notes due 2027 (the “2027 Notes”) 4.625% Senior Notes due 2031 (the “2031 Notes”) Principal Amount: 2027 Notes: €600,000,000 2031

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

SUBJECT TO COMPLETION, DATED MAY 9, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation € % Senior Notes due 2027 € % Senior Notes due 2031

Table of Contents This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 9, 2023 AMERICAN TOWER CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 9, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File