EBC / Eastern Bankshares, Inc. - 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): May 18, 2026 EASTERN BANKSHARES,

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 18, 2026 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the

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 23, 2026 EASTERN BANKSHARES

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 23, 2026 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

Eastern Bankshares, Inc. Reports First Quarter 2026 Financial Results Announces 15% Increase to Quarterly Dividend

Exhibit 99.1 Eastern Bankshares, Inc. Reports First Quarter 2026 Financial Results Announces 15% Increase to Quarterly Dividend •Net income of $65.3 million, or $0.29 per diluted share, included non-operating merger-related costs; operating net income of $88.6 million, or $0.40 per diluted share. •Return on average assets of 0.86%, or 1.17% on an operating basis; return on average tangible common

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ANNUAL REPORT 2025We do good things to help all people prosper. PURPOSE Integrity Diversity, Equity & Inclusion Innovation Commitment Teamwork VALUES EASTERN BANKSHARES, INC. 2Eastern Bankshares, Inc. (Nasdaq: EBC) is the holding company for Eastern Bank. Eastern Bankshares, Inc. (Nasdaq: EBC) is the holding company for Eastern Bank. stern Bankshares Inc (Nasdaq: EBC) is the holding com Founded in

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

DEFA14A 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 Statemen

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

Table of Contents 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 Pr

Subsidiaries of Eastern Bankshares, Inc.

Exhibit 21 Subsidiaries of Eastern Bankshares, Inc. As of March 2, 2026, the Registrant owned the following subsidiaries: Name State of Incorporation Names under which Subsidiary does Business Eastern Bank Massachusetts Eastern Bank Broadway Securities Corporation Massachusetts Broadway Securities Corporation Real/Property Services, Inc. Massachusetts Real/Property Services, Inc. Millennium Corpor

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

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the regis

Eastern Bankshares, Inc. Reports Fourth Quarter 2025 Financial Results Strong Organic Growth and Return of Capital to Shareholders

Exhibit 99.1 Eastern Bankshares, Inc. Reports Fourth Quarter 2025 Financial Results Strong Organic Growth and Return of Capital to Shareholders •Net income of $99.5 million, or $0.46 per diluted share, included a GAAP tax benefit related to losses from the investment portfolio repositioning completed in the first quarter and non-operating merger-related costs in the fourth quarter; operating net 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): January 22, 2026 EASTERN BANKSHAR

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 22, 2026 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 2) 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 3, 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 2) 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 3, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Inc

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.4 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The following unaudited pro forma condensed combined financial information combines the historical consolidated financial position and results of operations of Eastern Bankshares, Inc. (the “Company”) and HarborOne Bancorp, Inc. (“HarborOne”) as an acquisition by the Company of HarborOne. The merger agreement provided that e

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 3, 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 3, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Inc

Eastern Bankshares, Inc. Announces Completion of HarborOne Acquisition And Proration of Merger Consideration

EX-99.1 Exhibit 99.1 CORRECTING and REPLACING Eastern Bankshares, Inc. Announces Completion of HarborOne Acquisition And Proration of Merger Consideration November 3, 2025 BOSTON – (BUSINESS WIRE) – Please replace the release with the following corrected version due to multiple revisions. The updated release reads: Eastern Bankshares, Inc. Announces Completion of HarborOne Acquisition And Proratio

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 3, 2025 EASTERN BANKSHAR

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 3, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

As filed with the Securities and Exchange Commission on November 3, 2025

S-8 POS As filed with the Securities and Exchange Commission on November 3, 2025 Registration No.

HARBORONE BANCORP, INC. 2017 STOCK OPTION AND INCENTIVE PLAN

EX-10.1 Exhibit 10.1 HARBORONE BANCORP, INC. 2017 STOCK OPTION AND INCENTIVE PLAN SECTION 1. GENERAL PURPOSE OF THE PLAN; DEFINITIONS The name of the plan is the HarborOne Bancorp, Inc. 2017 Stock Option and Incentive Plan (the “Plan”). The purpose of the Plan is to encourage and enable the officers, employees and Non-Employee Directors of HarborOne Bancorp, Inc. (the “Company”) and its Subsidiari

Eastern Bankshares, Inc. Announces Completion of HarborOne Acquisition And Proration of Merger Consideration

EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. Announces Completion of HarborOne Acquisition And Proration of Merger Consideration BOSTON, MA, November 3, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, confirmed today that on November 1, 2025 Eastern completed its previously announced acquisition of HarborOne Bancorp, Inc. (“Har

HARBORONE BANCORP, INC. 2025 EQUITY INCENTIVE PLAN (AS AMENDED)

EX-10.1 Exhibit 10.1 HARBORONE BANCORP, INC. 2025 EQUITY INCENTIVE PLAN (AS AMENDED) SECTION 1. GENERAL PURPOSE OF THE PLAN; DEFINITIONS The name of the plan is the HarborOne Bancorp, Inc. 2025 Equity Incentive Plan (the “Plan”). The purpose of the Plan is to encourage and enable the officers, employees and Non-Employee Directors of HarborOne Bancorp, Inc. (the “Company”) and its Affiliates, inclu

As filed with the Securities and Exchange Commission on October 31, 2025

S-8 As filed with the Securities and Exchange Commission on October 31, 2025 Registration No.

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 Eastern Bankshares, Inc. 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 $0.01 per Other 415,000 $ 4,372,336.25 0.0001381 $ 603.82 Total Offering Amounts: $

Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Merger to be Effective on November 1, 2025

EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Merger to be Effective on November 1, 2025 BOSTON, MA & BROCKTON, MA, October 28, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, and HarborOne Bancorp, Inc. (“HarborOne”) (NASDAQ Global Select Market: HONE), the holding company for HarborOne Bank

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 EASTERN BANKSHAR

425 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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Or

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 EASTERN BANKSHAR

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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

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 23, 2025 EASTERN BANKSHAR

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 23, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Eastern Bankshares, Inc. Reports Third Quarter 2025 Financial Results Company Announces Authorization of 5% Share Repurchase Program

Exhibit 99.1 Eastern Bankshares, Inc. Reports Third Quarter 2025 Financial Results Company Announces Authorization of 5% Share Repurchase Program •Received all necessary regulatory approvals to complete merger with HarborOne Bancorp; expected to close November 1, 2025. •Net income of $106.1 million, or $0.53 per diluted share, included a GAAP tax benefit related to losses from the investment portf

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 16, 2025 EASTERN BANKSHAR

425 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 16, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Or

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 16, 2025 EASTERN BANKSHAR

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 16, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Election Deadline for Merger Consideration, Expected Closing Date, and Anticipated Delisting of HarborOne Common Stock in connection with the Merger

EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Election Deadline for Merger Consideration, Expected Closing Date, and Anticipated Delisting of HarborOne Common Stock in connection with the Merger BOSTON, MA & BROCKTON, MA, October 16, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, and HarborO

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 26, 2025 EASTERN BANKSH

425 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 26, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or

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 26, 2025 EASTERN BANKSH

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 26, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Orga

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EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. And HarborOne Bancorp, Inc. Announce Regulatory Approvals Received To Merge BOSTON, MA & BROCKTON, MA, September 26, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, and HarborOne Bancorp, Inc. (“HarborOne”) (NASDAQ: HONE), the holding company for HarborOne Bank, today jointly announc

STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 24, 2025 (“MERGER AGREEMENT”), BY AND AMONG EASTERN BANKSHARES, INC. (“EASTERN”), EASTERN BANK, HARBORONE BANCORP, INC. (“HARBORONE”),

EX-99.2 Exhibit 99.2 STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 24, 2025 (“MERGER AGREEMENT”), BY AND AMONG EASTERN BANKSHARES, INC. (“EASTERN”), EASTERN BANK, HARBORONE BANCORP, INC. (“HARBORONE”), AND HARBORONE BANK, PURSUANT TO WHICH HARBORONE BANCORP, INC. WILL MERGE WITH AND INTO EASTERN BANKSHARES, INC. (THE “MERGER”). N

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 24, 2025 EASTERN BANKSH

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 24, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Orga

STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 24, 2025 (“MERGER AGREEMENT”), BY AND AMONG EASTERN BANKSHARES, INC. (“EASTERN”), EASTERN BANK, HARBORONE BANCORP, INC. (“HARBORONE”),

EX-99.2 Exhibit 99.2 STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 24, 2025 (“MERGER AGREEMENT”), BY AND AMONG EASTERN BANKSHARES, INC. (“EASTERN”), EASTERN BANK, HARBORONE BANCORP, INC. (“HARBORONE”), AND HARBORONE BANK, PURSUANT TO WHICH HARBORONE BANCORP, INC. WILL MERGE WITH AND INTO EASTERN BANKSHARES, INC. (THE “MERGER”). N

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 25,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 25, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of I

Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Mailing of Stock/Cash Election Form

EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Mailing of Stock/Cash Election Form BOSTON, MA & BROCKTON, MA, September 25, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, and HarborOne Bancorp, Inc. (“HarborOne”) (NASDAQ: HONE), the holding company for HarborOne Bank, today jointly announced

Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Mailing of Stock/Cash Election Form

EX-99.1 Exhibit 99.1 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Announce Mailing of Stock/Cash Election Form BOSTON, MA & BROCKTON, MA, September 25, 2025 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the holding company for Eastern Bank, and HarborOne Bancorp, Inc. (“HarborOne”) (NASDAQ: HONE), the holding company for HarborOne Bank, today jointly announced

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 25,

425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 25, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction

401(k) QUESTIONS AND ANSWERS (“401(k) FAQ”)

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 401(k) QUESTIONS AND ANSWERS (“401(k) FAQ”) The following questions and answers address some frequently

STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF APRIL 24, 2025 (“MERGER AGREEMENT”), BY AND AMONG EASTERN BANKSHARES, INC. (“EASTERN”), EASTERN BANK, HARBORONE BANCORP, INC. (“HARBORONE”),

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 STOCK/CASH ELECTION FORM AND LETTER OF TRANSMITTAL PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED

Filed by Eastern Bankshares, Inc.

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 How your HarborOne equity is impacted by the upcoming Merger Background Subject to pending regulatory a

Important Notice Concerning Your Rights Under The HarborOne 401(k) Plan (“401(k) Plan”)

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 Important Notice Concerning Your Rights Under The HarborOne 401(k) Plan (“401(k) Plan”) September 24, 2

Continental Stock Transfer & Trust Company One State Street – 30th Floor New York, NY 10004 Attention: Corporate Actions Department

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 125 High Street Oliver Tower, Suite 901 Boston, MA 02110 To the shareholders of HarborOne Bancorp, Inc.

Filed by Eastern Bankshares, Inc.

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 HarborOne/Eastern Equity/Tender Offer E-Mails Draft 2: September 12, 2025 Window open email: Timing 9/2

ESOP QUESTIONS AND ANSWERS (“ESOP FAQ”)

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 ESOP QUESTIONS AND ANSWERS (“ESOP FAQ”) The following questions and answers address some frequently ask

Important Notice Concerning Your Rights to Distributions Under The HarborOne Bank Employee Stock Ownership Plan (“ESOP”) September 24, 2025

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 Important Notice Concerning Your Rights to Distributions Under The HarborOne Bank Employee Stock Owners

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425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 HarborOne Equity Award Election Tool Start of Block: Log in / Authentication Please log in. Email      

www.tabulationsplus.com/hone

425 Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: September 24, 2025 125 High Street Oliver Tower, Suite 901 Boston, MA 02110 To the shareholders of HarborOne Bancorp, Inc.

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, 2025 EASTERN BANKSHARES,

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, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

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 20, 2025 EASTERN BANKSHARE

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 20, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiz

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the 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 24, 2025 EASTERN BANKSHARES,

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 24, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

Eastern Bankshares, Inc. Reports Second Quarter 2025 Financial Results Strong Performance Reflects Focus on Growth and Profitability

Exhibit 99.1 Eastern Bankshares, Inc. Reports Second Quarter 2025 Financial Results Strong Performance Reflects Focus on Growth and Profitability •Net income of $100.2 million, or $0.50 per diluted share, included GAAP tax benefit related to losses from investment portfolio repositioning completed in the first quarter. •Operating net income of $81.7 million, or $0.41 per diluted share. •Return on

PROXY STATEMENT/PROSPECTUS

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-288117 PROXY STATEMENT/PROSPECTUS Dear HarborOne Shareholders: On behalf of HarborOne Bancorp, Inc. (“HarborOne”), we are pleased to enclose the accompanying proxy statement/prospectus relating to the acquisition of HarborOne by Eastern Bankshares, Inc. (“Eastern”). We are requesting that you take certain actions as a Ha

June 25, 2025

CORRESP 125 High Street Oliver Tower, Suite 901 Boston, MA 02110 June 25, 2025 VIA EDGAR U.

As filed with the Securities and Exchange Commission on June 25, 2025

Table of Contents As filed with the Securities and Exchange Commission on June 25, 2025 Registration No.

Consent of Raymond James Financial, Inc.

EX-99.2 Exhibit 99.2 Consent of Raymond James & Associates, Inc. Raymond James & Associates, Inc. (“Raymond James”) consents to (i) the inclusion and description of our opinion letter dated April 24, 2025 to the Board of Directors of HarborOne Bancorp, Inc. (the “Company”) included as Annex B to the proxy statement/prospectus relating to the proposed merger of the Company with Eastern Bankshares,

Form of Proxy Card of HarborOne Bancorp, Inc.

EX-99.3 Exhibit 99.3 HARBORONE BANCORP, INC. ATTN: INEZ FRIEDMAN-BOYCE 770 OAK STREET BROCKTON, MA 02301 VOTE BY INTERNET - www.proxyvote.com or scan the QR Barcode above Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 p.m. Eastern time on August 19, 2025. Have your proxy card in hand when you access the web site and follow the instru

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ☒ Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2024 OR ☐ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission file number 001-39610 A.Full title of the plan and address o

LETTER

June 18, 2025 R. David Rosato Chief Financial Officer Eastern Bankshares, Inc. 125 High Street Boston, MA 02110 Re: Eastern Bankshares, Inc. Registration Statement on Form S-4 Filed June 17, 2025 File No. 333-288117 Dear R. David Rosato: This is to advise you that we have not reviewed and will not review your registration statement. Please refer to Rules 460 and 461 regarding requests for accelera

Filing Fee Table

Calculation of Filing Fee Tables S-4 Eastern Bankshares, Inc. Table 1: Newly Registered and Carry Forward Securities 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

Consent of Joseph F. Casey (as a proposed director of Eastern Bankshares, Inc.)

EX-99.4 Exhibit 99.4 CONSENT OF PROSPECTIVE DIRECTOR In accordance with Rule 438 promulgated under the Securities Act of 1933, as amended, I hereby consent to my being named in this Registration Statement on Form S-4, to which this consent is an exhibit, filed by Eastern Bankshares, Inc. (the “Registrant”) with the Securities and Exchange Commission, and all amendments (including post-effective am

Consent of Raymond James Financial, Inc.

EX-99.2 Exhibit 99.2 Consent of Raymond James & Associates, Inc. Raymond James & Associates, Inc. (“Raymond James”) consents to (i) the inclusion and description of our opinion letter dated April 24, 2025 to the Board of Directors of HarborOne Bancorp, Inc. (the “Company”) included as Annex B to the proxy statement/prospectus relating to the proposed merger of the Company with Eastern Bankshares,

As filed with the Securities and Exchange Commission on June 17, 2025

S-4 Table of Contents As filed with the Securities and Exchange Commission on June 17, 2025 Registration No.

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the

Filed by Eastern Bankshares, Inc.

Filed by Eastern Bankshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: HarborOne Bancorp, Inc. SEC File No.: 001-38955 Filer’s SEC File No.: 001-39610 Date: April 30, 2025 On April 25, 2025, Eastern Bankshares, Inc. (“Eastern”) (Nasdaq: EBC), the holding company for Eastern Bank, di

Transaction highlights: + Meaningful Enhances Financially Low Fortress balance upside footprint attractive execution risk sheet opportunities o Bolsters o Sizable EPS o Capture greater o In-market o Robust pro Greater Boston accretion share of wealth

Exhibit 99.3 Merger with April 24, 2025 Transaction highlights: + Meaningful Enhances Financially Low Fortress balance upside footprint attractive execution risk sheet opportunities o Bolsters o Sizable EPS o Capture greater o In-market o Robust pro Greater Boston accretion share of wealth transaction forma capital, density (~16%) and commercial liquidity and o Conservative opportunities credit re

Transaction highlights: + Meaningful Enhances Financially Low Fortress balance upside footprint attractive execution risk sheet opportunities o Bolsters o Sizable EPS o Capture greater o In-market o Robust pro Greater Boston accretion share of wealth

Exhibit 99.3 Merger with April 24, 2025 Transaction highlights: + Meaningful Enhances Financially Low Fortress balance upside footprint attractive execution risk sheet opportunities o Bolsters o Sizable EPS o Capture greater o In-market o Robust pro Greater Boston accretion share of wealth transaction forma capital, density (~16%) and commercial liquidity and o Conservative opportunities credit re

Regulation FD Disclosure

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 24, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

Regulation FD Disclosure, 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 24, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

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Exhibit 99.2 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Enter Into Definitive Agreement To Merge Key Highlights: • Merger solidifies Eastern’s leading position in Greater Boston while expanding into Rhode Island • Financially compelling transaction with 16% EPS accretion resulting in top quartile operating profitability1 • Pro forma balance sheet has robust capital, liquidity and reserve

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 24, 2025 EASTERN BANKSHARES

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 24, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

Agreement and Plan of Merger by and among Eastern Bankshares, Inc., Eastern Bank, HarborOne Bancorp, Inc. and HarborOne Bank, dated as of April 24, 2025*

EX-2.1 Exhibit 2.1 AGREEMENT AND PLAN OF MERGER DATED AS OF APRIL 24, 2025 BY AND AMONG EASTERN BANKSHARES, INC. EASTERN BANK, HARBORONE BANCORP, INC., AND HARBORONE BANK TABLE OF CONTENTS ARTICLE I THE TRANSACTIONS 1 Section 1.01 The Merger 1 Section 1.02 The Bank Merger 1 Section 1.03 Closing 2 Section 1.04 Effective Time 2 Section 1.05 Organizational Documents, Buyer Bank Locations 2 Section 1.

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EX-99.2 Exhibit 99.2 Eastern Bankshares, Inc. and HarborOne Bancorp, Inc. Enter Into Definitive Agreement To Merge Key Highlights: • Merger solidifies Eastern’s leading position in Greater Boston while expanding into Rhode Island • Financially compelling transaction with 16% EPS accretion resulting in top quartile operating profitability1 • Pro forma balance sheet has robust capital, liquidity and

Eastern Bankshares, Inc. Reports First Quarter 2025 Financial Results Completed $1.3 Billion Investment Portfolio Repositioning Announces 8% Increase to Quarterly Dividend

Exhibit 99.1 Eastern Bankshares, Inc. Reports First Quarter 2025 Financial Results Completed $1.3 Billion Investment Portfolio Repositioning Announces 8% Increase to Quarterly Dividend •Net loss of $217.7 million, or $1.08 per diluted share, included non-operating loss related to investment portfolio repositioning. •Operating net income of $67.5 million, or $0.34 per diluted share. •Net interest m

VOTING AGREEMENT

EX-99.1 Exhibit 99.1 Execution Version VOTING AGREEMENT VOTING AGREEMENT (“Agreement”), dated as of April [24], 2025, by and between Eastern Bankshares, Inc., a Massachusetts corporation (“Buyer”), and the undersigned holder (the “Shareholder”) of Common Stock, par value $0.01 per share (the “Common Stock”), of HarborOne Bancorp, Inc., a Massachusetts corporation (“Company”). BACKGROUND STATEMENTS

Agreement and Plan of Merger by and among Eastern Bankshares, Inc., Eastern Bank, HarborOne Bancorp, Inc. and HarborOne Bank, dated as of April 24, 2025*

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER DATED AS OF APRIL 24, 2025 BY AND AMONG EASTERN BANKSHARES, INC. EASTERN BANK, HARBORONE BANCORP, INC., AND HARBORONE BANK TABLE OF CONTENTS ARTICLE I THE TRANSACTIONS 1 Section 1.01 The Merger 1 Section 1.02 The Bank Merger 1 Section 1.03 Closing 2 Section 1.04 Effective Time 2 Section 1.05 Organizational Documents, Buyer Bank Locations 2 Section 1.06 Dire

VOTING AGREEMENT

Exhibit 99.1 Execution Version VOTING AGREEMENT VOTING AGREEMENT (“Agreement”), dated as of April [24], 2025, by and between Eastern Bankshares, Inc., a Massachusetts corporation (“Buyer”), and the undersigned holder (the “Shareholder”) of Common Stock, par value $0.01 per share (the “Common Stock”), of HarborOne Bancorp, Inc., a Massachusetts corporation (“Company”). BACKGROUND STATEMENTS: A. Con

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐  Preliminary Proxy Statement ☐   Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐

ARS

2024 ANNUAL REPORT2 EASTERN BANKSHARES, INC. We embrace our culture and creative spirit to build lasting relationships with our customers, colleagues and communities in pursuit of a better, fairer, more sustainable world. We do good things to help all people prosper. Integrity Diversity, Equity & Inclusion Innovation Commitment Teamwork PURPOSE VISION VALUES3 ANNUAL REPORT 2024 COMPLETED CAMBRIDGE

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

DEFA14A 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 Statemen

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

Table of Contents 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 Pr

Eastern Bankshares, Inc. Insider Trading Policy

EASTERN BANKSHARES, INC. – INSIDER TRADING POLICY 1 Division: Department: LEGAL Last Revision Date: 10/11/24 Contents I. Policy Statement .............................................................................................................................. 2 II. Purpose and Scope................................................................................................................

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

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the regis

Subsidiaries of Eastern Bankshares, Inc.

Exhibit 21 Subsidiaries of Eastern Bankshares, Inc. As of February 27, 2025, the Registrant owned the following subsidiaries: Name State of Incorporation Names under which Subsidiary does Business Eastern Bank Massachusetts Eastern Bank Broadway Securities Corporation Massachusetts Broadway Securities Corporation Real/Property Services, Inc. Massachusetts Real/Property Services, Inc. Millennium Co

Regulation FD Disclosure, 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): January 23, 2025 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Eastern Bankshares, Inc. Reports Fourth Quarter 2024 Net Income of $60.8 Million, or $0.30 per Diluted Share ~ Company Announces 2025 Investment Portfolio Repositioning ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports Fourth Quarter 2024 Net Income of $60.8 Million, or $0.30 per Diluted Share ~ Company Announces 2025 Investment Portfolio Repositioning ~ •Operating net income* of $68.3 million, or $0.34 per diluted share. •$1.2 billion investment portfolio repositioning in Q1 2025 anticipated to add approximately $0.13 to 2025 operating EPS. •Net interest margin on a

Current Report

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 31, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of (Commission (I.R.S. Em

EBC / Eastern Bankshares, Inc. / PRINCIPAL FINANCIAL GROUP INC - SC13 G/A EASTERN BANKSHARES INC AMDT 4 093024 Passive Investment

CUSIP No. 27627N105 13G/A Page 1 of 5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4) Eastern Bankshares, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 27627N105 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Ch

EBC / Eastern Bankshares, Inc. / T. Rowe Price Investment Management, Inc. Passive Investment

SC 13G/A 1 ebc13gasep24.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) EASTERN BANKSHARES INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 27627N105 (CUSIP NUMBER) September 30, 2024 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule

EBC / Eastern Bankshares, Inc. / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.1 EASTERN BANKSHARES INC COMMON STOCK Cusip #27627N105 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #27627N105 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 18,421,237 Item 6: 0 Item 7: 18,431,075 Item 8: 0 It

Investor Presentation November, 2024 Exhibit 99.1 DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 /

Investor Presentation November, 2024 Exhibit 99.1 DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 168 / 171 103 / 086 / 164 208 / 210 / 211 238 / 184 / 028 2 Our Company EBC Boston, MA Nasdaq Headqua

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): November 12, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organ

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of

Regulation FD Disclosure, 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 24, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Eastern Bankshares, Inc. Reports Third Quarter 2024 Financial Results ~ Company Announces a 9% Increase to Quarterly Dividend ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports Third Quarter 2024 Financial Results ~ Company Announces a 9% Increase to Quarterly Dividend ~ BOSTON, October 24, 2024 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company”) (NASDAQ: EBC), the holding company of Eastern Bank, today announced its 2024 third quarter financial results. FINANCIAL HIGHLIGHTS •Net loss of $6.2 million included the initi

Exhibit 99.2 Report of Independent Registered Public Accounting Firm To the Shareholders and the Board of Directors of Cambridge Bancorp: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of

Exhibit 99.2 Report of Independent Registered Public Accounting Firm To the Shareholders and the Board of Directors of Cambridge Bancorp: Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Cambridge Bancorp and subsidiaries (the Company) as of December 31, 2023, and 2022, the related consolidated statements of income, comprehensive inco

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.4 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The following unaudited pro forma condensed combined financial information combines the historical consolidated financial position and results of operations of Eastern Bankshares, Inc. (the “Company”) and Cambridge Bancorp (“Cambridge”) as an acquisition by the Company of Cambridge. The merger agreement provided that each ho

Exhibit 99.3 CAMBRIDGE BANCORP AND SUBSIDIARIES UNAUDITED CONSOLIDATED BALANCE SHEETS March 31, 2024 December 31, 2023 (dollars in thousands, except share information) Assets Cash and cash equivalents $ 29,705 $ 33,004 Investment securities Available

Exhibit 99.3 CAMBRIDGE BANCORP AND SUBSIDIARIES UNAUDITED CONSOLIDATED BALANCE SHEETS March 31, 2024 December 31, 2023 (dollars in thousands, except share information) Assets Cash and cash equivalents $ 29,705 $ 33,004 Investment securities Available for sale, at fair value (amortized cost $159,483 and $163,376, respectively) 133,222 137,838 Held to maturity, at amortized cost (fair value $777,383

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 12, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorp

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the r

Summary of Material Terms of Denis K. Sheahan’s Rollover Equity Awards in Cambridge Bancorp Merger

Ex. 10.5 Eastern Bankshares, Inc. Summary of Material Terms of Denis K. Sheahan’s Rollover Equity Awards in Cambridge Bancorp Merger Effective July 12, 2024, Denis K. Sheahan became the Chief Executive Officer and a director of Eastern Bankshares, Inc. (the “Company”) upon the mergers of Cambridge Bancorp (“CATC”) and its wholly owned subsidiary Cambridge Trust Company (together with CATC, “Cambri

Offer Letter, dated July 1, 2024, between Eastern Bank and Denis K. Sheahan

July 1, 2024 Denis K. Sheahan 35 Crescent Avenue Scituate, MA 02066 Dear Denis, This offer letter provides additional information about your role with Eastern after the merger. As previously communicated to you in a letter dated September 19, 2023, we are delighted that you will join us as Chief Executive Officer beginning July 13, 2024, following the merger effective date. Your compensation will

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, 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): July 25, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

Eastern Bankshares, Inc. Reports Second Quarter 2024 Financial Results ~ Company Announces Authorization of Share Repurchase Program ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports Second Quarter 2024 Financial Results ~ Company Announces Authorization of Share Repurchase Program ~ BOSTON, July 25, 2024 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its subsidiaries, “Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2024 second quarter financ

Amendment No. 1 to Agreement and Plan of Merger by and among Eastern Bankshares, Inc., Eastern Bank, Citadel MS 2023, Inc., Cambridge Bancorp and Cambridge Trust Company, dated as of July 2, 2024

Exhibit 2.2 Execution Version AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER This AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER (the “Amendment”), dated effective as of July 2, 2024, is by and among Eastern Bankshares, Inc. (“Buyer”), Citadel MS 2023, Inc., a wholly-owned subsidiary of Buyer (“Merger Sub”), Eastern Bank, a wholly-owned subsidiary of Buyer (“Buyer Bank”), Cambridge Bancorp (“Com

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 12, 2024 EASTERN BANKSHARES,

Form 425 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 12, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or

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Exhibit 99.3 Eastern Bankshares, Inc. Announces Successful Merger With Cambridge Bancorp, And Names David Rosato New Chief Financial Officer Eastern Bank Surpasses $25 Billion In Assets BOSTON, MA, July 15, 2024 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company for Eastern Bank, today announced the closing of its merger with Cambridge Bancorp (NAS

June 28, 2024

Exhibit 99.1 June 28, 2024 Robert David Rosato 14 Otis Street Needham, MA 02492 Dear David, We are delighted to offer you the position of Chief Financial Officer, reporting to Denis Sheahan, starting August 1, 2024. Your compensation will be paid at a bi-weekly rate of $21,153, which equates to approximately $550,000 annually. In addition to your core compensation, you will be eligible to particip

Regulation FD Disclosure

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 12, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

CHANGE IN CONTROL AGREEMENT

Exhibit 99.2 CHANGE IN CONTROL AGREEMENT This Change in Control Agreement (this “Agreement”) is effective as of the 1st day of August, 2024, by and among Eastern Bankshares, Inc., a Massachusetts corporation (“Eastern Bankshares”), its wholly-owned subsidiary, Eastern Bank, a Massachusetts-chartered bank (the “Bank”), and David Rosato (the “Executive”), residing in Massachusetts. Eastern Bankshare

Cambridge Bancorp 2017 Equity and Cash Incentive Plan

Exhibit 10.2 CAMBRIDGE BANCORP 2017 EQUITY AND CASH INCENTIVE PLAN 1. PURPOSE The purpose of this 2017 Equity and Cash Incentive Plan (the “Plan”) is to encourage key employees, Directors, and consultants of Cambridge Bancorp (the “Company”) and its Subsidiaries (as defined below) to continue their association with the Company by providing favorable opportunities for them to participate in the own

As filed with the Securities and Exchange Commission on July 11, 2024

As filed with the Securities and Exchange Commission on July 11, 2024 Registration No.

Regulation FD Disclosure

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, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A 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 19, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Or

# # #

Exhibit 99.1 FOR IMMEDIATE RELEASE Eastern Bankshares, Inc. Announces Newly Appointed Members To Its Board of Directors BOSTON, MA, July 1, 2024 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company for Eastern Bank, announced today the appointment of four members of Cambridge Bancorp’s (NASDAQ: CATC) (“Cambridge”) Board of Directors to the Eastern an

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ☒ Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2023 OR ☐ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission file number 001-39610 A.Full title of the plan and address o

# # #

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE Eastern Bankshares, Inc. And Cambridge Bancorp Announce Regulatory Approvals Received To Merge BOSTON, MA, May 28, 2024 – Eastern Bankshares, Inc. (“Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company for Eastern Bank, and Cambridge Bancorp (NASDAQ: CATC) (“Cambridge”), the parent company of Cambridge Trust Company, today jointly annou

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 28, 2024 EASTERN BANKSHARES,

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 28, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

Current Report

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 13, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 24, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

Eastern Bankshares, Inc. Reports First Quarter 2024 Financial Results ~ Receipt of Shareholder Approvals for the Merger with Cambridge ~ ~ CFO James Fitzgerald Announces Upcoming Retirement ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports First Quarter 2024 Financial Results ~ Receipt of Shareholder Approvals for the Merger with Cambridge ~ ~ CFO James Fitzgerald Announces Upcoming Retirement ~ BOSTON, April 25, 2024 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its subsidiaries, “Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company of Ea

ARS

ANNUAL REPORT 20234 EASTERN BANKSHARES, INC. We embrace our culture and creative spirit to build lasting relationships with our customers, colleagues and communities in pursuit of a better, fairer, more sustainable world. We do good things to help people prosper. Integrity Diversity, Equity & Inclusion Innovation Commitment Teamwork PURPOSE VISION VALUES3 ANNUAL REPORT 2023 AT A GLANCE Eastern Ban

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 ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

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 ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

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 EASTERN BANKSHA

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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organ

Eastern Bankshares, Inc. Clawback Policy

Eastern Bankshares, Inc. - Clawback Policy Internal Confidential 1 Division: Human Resources Department: Human Resources Last Revision Date: June 5, 2023 Contents I. Policy Statement .......................................................................................................................................... 2 II. Purpose and Scope ......................................................

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

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the regis

Subsidiaries of Eastern Bankshares, Inc.

Exhibit 21 Subsidiaries of Eastern Bankshares, Inc. As of February 26, 2024, the Registrant owned the following subsidiaries: Name State of Incorporation Names under which Subsidiary does Business Eastern Bank Massachusetts Eastern Bank Eastern Insurance Group LLC Massachusetts Eastern Insurance Group Broadway Securities Corporation Massachusetts Broadway Securities Corporation Real/Property Servi

Restated Benefit Equalization Plan

BENEFIT EQUALIZATION PLAN Eastern Bank PLAN DOCUMENT Restated as of January 1, 2024 2 EASTEN BANK BENEFIT EQUALIZATION PLAN TABLE OF CONTENTS Section 1 Definitions .

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 20, 2024 EASTERN BANKSHA

425 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 20, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or O

Current Report

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 20, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organ

EBC / Eastern Bankshares, Inc. / T. Rowe Price Investment Management, Inc. Passive Investment

SC 13G 1 ebc13gdec23.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) EASTERN BANKSHARES INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 27627N105 (CUSIP NUMBER) December 31, 2023 (Date of Event which Requires Filing of Statement) Check the appropriate box to designate the Rule pursu

EBC / Eastern Bankshares, Inc. / 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.: 3)* Name of issuer: Eastern Bankshares Inc Title of Class of Securities: Common Stock CUSIP Number: 27627N105 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

EBC / Eastern Bankshares, Inc. / FMR LLC Passive Investment

SCHEDULE 13G Amendment No.0 EASTERN BANKSHARES INC COMMON STOCK Cusip #27627N105 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #27627N105 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 11,018,681 Item 6: 0 Item 7: 11,023,954 Item 8: 0 Item 9: 11,023,954 Item

EBC / Eastern Bankshares, Inc. / PRINCIPAL FINANCIAL GROUP INC - 13G/A EASTERN BANKSHARES, INC. AMDT 3 123123 Passive Investment

SC 13G/A 1 a13gaeasternbanksharesinca.htm 13G/A EASTERN BANKSHARES, INC. AMDT 3 123123 CUSIP No. 27627N105 13G/A Page 1 of 5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Eastern Bankshares, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 27627N105 (CUS

EBC / Eastern Bankshares, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us27627n1054012624.txt us27627n1054012624.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 3) Eastern Bankshares, Inc. - (Name of Issuer) Common Stock - (Title of Class of Securities) 27627N105 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropria

Eastern Bankshares, Inc. Reports Fourth Quarter 2023 Financial Results ~ Earnings, Capital, and Liquidity Enhancements Resulting from Eastern Insurance Group LLC Asset Sale ~ ~ Growth in Core Deposits and Reduction in Wholesale Funding ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports Fourth Quarter 2023 Financial Results ~ Earnings, Capital, and Liquidity Enhancements Resulting from Eastern Insurance Group LLC Asset Sale ~ ~ Growth in Core Deposits and Reduction in Wholesale Funding ~ BOSTON, January 25, 2024 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its subsidiaries, “Eastern”) (NASDAQ Global Sele

Regulation FD Disclosure, 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): January 25, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

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 16, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

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 16, 2024 EASTERN BANKSHAR

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 16, 2024 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

LETTER

United States securities and exchange commission logo January 22, 2024 James Fitzgerald Chief Financial Officer Eastern Bankshares, Inc.

DATED JANUARY 16, 2024 JOINT PROXY STATEMENT/PROSPECTUS

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-275479 DATED JANUARY 16, 2024 JOINT PROXY STATEMENT/PROSPECTUS Dear Eastern and Cambridge Shareholders: On behalf of the Boards of Directors of Eastern Bankshares, Inc. (“Eastern”) and Cambridge Bancorp (“Cambridge”), we are pleased to enclose the accompanying joint proxy statement/prospectus relating to the acquisition of Cam

January 11, 2024

January 11, 2024 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: Michael Volley ([email protected]) Michael Henderson ([email protected]) James Lopez ([email protected]) Madeleine Joy Mateo ([email protected]) Re: Eastern Bankshares, Inc. Registration Statement on Form S-4 CIK No. 0001810546 File No. 333-275479 Request

Consent of J.P. Morgan Securities LLC

Exhibit 99.2 CONSENT OF J.P. MORGAN SECURITIES LLC We hereby consent to (i) the inclusion of our opinion letter dated September 19, 2023 to the board of directors of Eastern Bankshares, Inc. (“Eastern”) as Annex C to the joint proxy statement/prospectus which forms a part of Amendment No. 2 to the registration statement on Form S-4 (the “Registration Statement”) relating to the proposed merger of

As filed with the Securities and Exchange Commission on January 11, 2024

Table of Contents As filed with the Securities and Exchange Commission on January 11, 2024 Registration No.

Consent of BofA Securities, Inc.

Exhibit 99.3 January 11, 2024 The Board of Directors Cambridge Bancorp 1336 Massachusetts Avenue Cambridge, MA 02138 Members of the Board of Directors: We hereby consent to the inclusion of our opinion letter, dated September 19, 2023, to the Board of Directors of Cambridge Bancorp (“Cambridge”) as Annex B to, and to the reference thereto under the headings “SUMMARY — Opinion of Cambridge’s Financ

January 11, 2024

Michael K. Krebs Direct Line: (617) 439-2288 Fax: (617) 310-9288 E-mail: [email protected] January 11, 2024 CONFIDENTIAL SUBMISSION U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: James Lopez ([email protected]) Michael Volley ([email protected]) Michael Henderson ([email protected]) Madeleine Joy Mateo ([email protected]) Re: E

LETTER

United States securities and exchange commission logo January 10, 2024 Robert F. Rivers Chief Executive Officer Eastern Bankshares, Inc. 265 Franklin Street Boston, MA 02110 Re: Eastern Bankshares, Inc. Amendment No. 1 to Registration Statement on Form S-4 Response dated January 8, 2024 File No. 333-275479 Dear Robert F. Rivers: We have reviewed your response dated January 8, 2024 and have the fol

Interest Rate Sensitivity As of December 31, 2023 Change in Interest Rates (basis points) (1) Net Interest Income Year 1 Forecast Year 1 Change from Level Policy Limit (Dollars in thousands) 400 $ — #DIV/0! (20 %) 200 — #DIV/0! (12 %) 100 — #DIV/0! (

January 9, 2024 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance, Office of Finance Washington, D.

January 8, 2024

Michael K. Krebs Direct Line: (617) 439-2288 Fax: (617) 310-9288 E-mail: [email protected] January 8, 2024 CONFIDENTIAL SUBMISSION U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: Michael Volley ([email protected]) Michael Henderson ([email protected]) James Lopez ([email protected]) Madeleine Joy Mateo ([email protected]) Re: Ea

LETTER

United States securities and exchange commission logo January 5, 2024 James Fitzgerald Chief Financial Officer Eastern Bankshares, Inc.

LETTER

United States securities and exchange commission logo January 5, 2024 Robert F. Rivers Chief Executive Officer Eastern Bankshares, Inc. 265 Franklin Street Boston, MA 02110 Re: Eastern Bankshares, Inc. Amendment No. 1 to Registration Statement on Form S-4 Filed December 20, 2023 File No. 333-275479 Dear Robert F. Rivers: We have reviewed your amended registration statement and have the following c

Form of Proxy Card of Cambridge

EX-99.6 Exhibit 99.6 FORM OF PRELIMINARY PROXY CARD - SUBJECT TO COMPLETION PROXY CAMBRIDGE BANCORP SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON [ ] THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS The undersigned hereby makes, constitutes, and appoints Hambleton Lord, Denis K. Sheahan, and R. Gregg Stone, and each of them (with the power of substitution), proxies for the undersigned t

As filed with the Securities and Exchange Commission on December 20, 2023

S-4/A Table of Contents As filed with the Securities and Exchange Commission on December 20, 2023 Registration No.

Consent of J.P. Morgan Securities LLC

EX-99.2 Exhibit 99.2 CONSENT OF J.P. MORGAN SECURITIES LLC We hereby consent to (i) the inclusion of our opinion letter dated September 19, 2023 to the board of directors of Eastern Bankshares, Inc. (“Eastern”) as Annex C to the joint proxy statement/prospectus which forms a part of Amendment No. 1 to the registration statement on Form S-4 (the “Registration Statement”) relating to the proposed me

December 20, 2023

Michael K. Krebs Direct Line: (617) 439-2288 Fax: (617) 310-9288 E-mail: [email protected] December 20, 2023 CONFIDENTIAL SUBMISSION U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: Michael Volley ([email protected]) Michael Henderson ([email protected]) James Lopez ([email protected]) Madeleine Joy Mateo ([email protected]) Re:

Form of Proxy Card of Eastern Bankshares, Inc.

EX-99.5 Exhibit 99.5 YOUR VOTE IS IMPORTANT! PLEASE VOTE BY: INTERNET Go To: www.proxypush.com/EBC • Cast your vote online • Have your Proxy Card ready P.O. BOX 8016, CARY, NC 27512-9903 • Follow the simple instructions to record your vote PHONE Call 1-866-458-2993 • Use any touch-tone telephone • Have your Proxy Card ready • Follow the simple recorded instructions MAIL • Mark, sign and date your

Interest Rate Sensitivity As of December 31, 2023 Change in Interest Rates (basis points) (1) Net Interest Income Year 1 Forecast Year 1 Change from Level Policy Limit (Dollars in thousands) 400 $ #DIV/0! (20 %) 200 #DIV/0! (12 %) 100 #DIV/0! (10 %)

265 Franklin Street Boston, MA 02110-3120 easternbank.com December 20, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance, Office of Finance Washington, D.C. 20549 Attention: Sarmad Makhdoom Michael Henderson Madeleine Joy Mateo James Lopez Re: Eastern Bankshares, Inc. Form 10-K for the year ended December 31, 2022 Form 10-Q for the quarter ended Septem

Consent of BofA Securities, Inc.

EX-99.3 Exhibit 99.3 December 20, 2023 The Board of Directors Cambridge Bancorp 1336 Massachusetts Avenue Cambridge, MA 02138 Members of the Board of Directors: We hereby consent to the inclusion of our opinion letter, dated September 19, 2023, to the Board of Directors of Cambridge Bancorp (“Cambridge”) as Annex B to, and to the reference thereto under the headings “SUMMARY — Opinion of Cambridge

Filing Fee Table

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to Be Registered Amount to Be Registered(1) Proposed Maximum Offering Price per Unit Proposed Maximum Aggregate Offering Price(2) Amount of Registration Fee(3) Common Stock, par value $0.

LETTER

United States securities and exchange commission logo December 11, 2023 James Fitzgerald Chief Financial Officer Eastern Bankshares, Inc.

LETTER

United States securities and exchange commission logo December 11, 2023 Robert F. Rivers Chief Executive Officer Eastern Bankshares, Inc. 265 Franklin Street Boston, MA 02110 Re: Eastern Bankshares, Inc. Registration Statement on Form S-4 Filed November 13, 2023 File No. 333-275479 Dear Robert F. Rivers: We have reviewed your registration statement and have the following comments. Please respond t

Consent of J.P. Morgan Securities LLC

EX-99.2 Exhibit 99.2 CONSENT OF J.P. MORGAN SECURITIES LLC We hereby consent to (i) the inclusion of our opinion letter dated September 19, 2023 to the board of directors of Eastern Bankshares, Inc. (“Eastern”) as Annex C to the joint proxy statement/prospectus which forms a part of the registration statement on Form S-4 (the “Registration Statement”) relating to the proposed merger of Eastern and

Consent of Denis K. Sheahan (as a proposed director of Eastern Bankshares, Inc.)

EX-99.4 Exhibit 99.4 CONSENT OF DENIS K. SHEAHAN In accordance with Rule 438 under the Securities Act of 1933, as amended (the “Securities Act”), the undersigned hereby consents to being named as a person about to become a director of Eastern Bankshares, Inc. (“Eastern Bankshares”) in the Joint Proxy Statement/Prospectus of Eastern Bankshares and Cambridge Bancorp, included in the Registration Sta

Consent of BofA Securities, Inc.

EX-99.3 Exhibit 99.3 November 13, 2023 The Board of Directors Cambridge Bancorp 1336 Massachusetts Avenue Cambridge, MA 02138 Members of the Board of Directors: We hereby consent to the inclusion of our opinion letter, dated September 19, 2023, to the Board of Directors of Cambridge Bancorp (“Cambridge”) as Annex B to, and to the reference thereto under the headings “SUMMARY — Opinion of Cambridge

Filing Fee Table

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to Be Registered Amount to Be Registered(1) Proposed Maximum Offering Price per Unit Proposed Maximum Aggregate Offering Price(2) Amount of Registration Fee(3) Common Stock, par value $0.

As filed with the Securities and Exchange Commission on November 13, 2023

Form S-4 Table of Contents As filed with the Securities and Exchange Commission on November 13, 2023 Registration No.

EXPLANATORY NOTE

Exhibit 99.1 EXPLANATORY NOTE Eastern Bankshares, Inc. (the “Company”) is filing this Exhibit 99.1 to its Current Report on Form 8-K (including this Exhibit 99.1, the “Form 8-K”) solely to recast certain financial information and related disclosures included in the Company’s Current Report on Form 10-K for the fiscal year ended December 31, 2022, originally filed with the United States (“U.S.”) Se

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 8, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 31, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Inc

UNAUDITED PRO FORMA CONDENSED FINANCIAL INFORMATION

Exhibit 99.1 UNAUDITED PRO FORMA CONDENSED FINANCIAL INFORMATION The following unaudited pro forma condensed financial information reflects the statements of income for the nine months ended September 30, 2023, and for the years ended December 31, 2022, December 31, 2021, and December 31, 2020, as if the Asset Sale had occurred on January 1, 2020. The unaudited pro forma condensed balance sheet as

Amendment No. 3 to Benefit Equalization Plan dated June 5, 2023

AMENDMENT EASTERN BANK BENEFIT EQUALIZATION PLAN Preamble Eastern Bank (the “Bank”) sponsors the Eastern Bank Benefit Equalization Plan (the "Plan").

Amendment No. 1 to Benefit Equalization Plan dated December 12, 2020

AMENDMENT EASTERN BANK BENEFIT EQUALIZATION PLAN Preamble Eastern Bank (the “Bank”) sponsors the Eastern Bank Benefit Equalization Plan (the "Plan").

Amendment to Eastern Bank Stock Ownership Plan, dated June 5, 2023

AMENDMENT EASTERN BANK EMPLOYEE STOCK OWNERSHIP PLAN Preamble Eastern Bank (the “Bank”) sponsors the Eastern Bank Employee Stock Ownership Plan (the "Plan").

Amendment No.2 to Benefit Equalization Plan dated January 1, 2022

AMENDMENT EASTERN BANK BENEFIT EQUALIZATION PLAN Preamble Eastern Bank (the “Bank”) sponsors the Eastern Bank Benefit Equalization Plan (the "Plan").

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of

Current Report

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 31, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

# # #

Exhibit 99.1 Eastern Bankshares, Inc. Announces Closing Of Eastern Insurance Group LLC Asset Sale BOSTON, MA, October 31, 2023 – Eastern Bankshares, Inc. (the “Company”) (Nasdaq Global Select Market: EBC), the stock holding company for Eastern Bank, announced today it has completed the previously disclosed sale of Eastern Bank’s insurance operations, which conduct business under the name Eastern I

# # #

Exhibit 99.1 Eastern Bankshares, Inc. Appoints Marisa J. Harney And Linda M. Williams To Its Board Of Directors New Directors Bring Extensive Banking, Risk Management and Audit Experience BOSTON, MA, October 30, 2023 – Eastern Bankshares, Inc. (the “Company”) (Nasdaq Global Select Market: EBC), the stock holding company for Eastern Bank, announced today the appointment of Marisa J. Harney and Lind

Current Report

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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Eastern Bankshares, Inc. Reports Third Quarter 2023 Financial Results ~ Company Announces a 10% Increase to Quarterly Dividend ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports Third Quarter 2023 Financial Results ~ Company Announces a 10% Increase to Quarterly Dividend ~ BOSTON, October 26, 2023 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its subsidiaries, “Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2023 third quarter financial

Regulation FD Disclosure, 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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

EXECUTIVE SEVERANCE BENEFITS AGREEMENT

Exhibit 99.2 EXECUTIVE SEVERANCE BENEFITS AGREEMENT This Executive Severance Benefits Agreement (this “Agreement”) is made this 19th day of September 2023, by and between Denis Sheahan (the “Executive”) and Eastern Bank (“Bank”). Each of Bank and the Executive is sometimes referred to in this Agreement as a “Party” and collectively as the “Parties”. 1. Effectiveness of this Agreement; Superseded C

Forward-looking statements This presentation contains “forward-looking statements” within the meaning of section 27A of the Securities Act of 1933, as amended, and section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statem

Exhibit 99.5 Merger with and sale of September 19, 2023 Forward-looking statements This presentation contains “forward-looking statements” within the meaning of section 27A of the Securities Act of 1933, as amended, and section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include statements regarding anticipated future events and can be identified by the fact

VOTING AGREEMENT

Exhibit 99.1 Execution Version VOTING AGREEMENT VOTING AGREEMENT (“Agreement”), dated as of September , 2023, by and among Eastern Bankshares, Inc., a Massachusetts corporation (“Buyer”), Citadel MS 2023, Inc., a Massachusetts corporation (“Merger Sub,” and together with Buyer, “Buyers”) and the undersigned holder (the “Shareholder”) of Common Stock, par value $1.00 per share (the “Common Stock”),

Agreement and Plan of Merger by and among Eastern Bankshares, Inc., Eastern Bank, Citadel MS 2023, Inc., Cambridge Bancorp and Cambridge Trust Company, dated as of September 19, 2023

Exhibit 2.2 AGREEMENT AND PLAN OF MERGER DATED AS OF SEPTEMBER 19, 2023 BY AND AMONG EASTERN BANKSHARES, INC., EASTERN BANK, CITADEL MS 2023, INC., CAMBRIDGE BANCORP, AND CAMBRIDGE TRUST COMPANY TABLE OF CONTENTS ARTICLE I THE TRANSACTIONS 1 Section 1.01 The Transactions 1 Section 1.02 Closing 2 Section 1.03 Effective Times 2 Section 1.04 Organizational Documents 3 Section 1.05 Directors and Offic

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 19, 2023 EASTERN BANKSH

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 19, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Orga

Strategic Repositioning Strengthens Market Position as Greater Boston’s Leading Community Bank

Exhibit 99.4 Eastern Bankshares, Inc. Announces Agreement to Sell the Insurance Operations of Eastern Insurance Group, LLC to Arthur J. Gallagher & Co. and Enters Into Definitive Agreement to Merge with Cambridge Bancorp Strategic Repositioning Strengthens Market Position as Greater Boston’s Leading Community Bank BOSTON, MA, September 19, 2023 – Eastern Bankshares, Inc. (“Eastern” or the “Company

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, 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 19, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Orga

Asset Purchase Agreement by and among Eastern Insurance Group LLC, Eastern Bank, Eastern Bankshares, Inc. and Arthur J. Gallagher Risk Management Services, LLC, dated as of September 19, 2023

Exhibit 2.1 ASSET PURCHASE AGREEMENT BY AND AMONG EASTERN INSURANCE GROUP LLC as Seller, ARTHUR J. GALLAGHER RISK MANAGEMENT SERVICES, LLC, as Buyer AND EASTERN BANK as Bank, EASTERN BANKSHARES, INC. as Parent dated as of September 19, 2023 TABLE OF CONTENTS ARTICLE I DEFINITIONS 1 ARTICLE II PURCHASE AND SALE 17 Section 2.1 Sale and Purchase of the Assets 17 Section 2.2 Excluded Assets 18 Section

CHANGE IN CONTROL AGREEMENT

Exhibit 99.3 Execution Version CHANGE IN CONTROL AGREEMENT This Change in Control Agreement (this “Agreement”) is made as of the 19th day of September, 2023, by and among Eastern Bankshares, Inc. (“Eastern Bankshares”), its wholly owned subsidiary, Eastern Bank (the “Bank”), and Denis Sheahan (the “Executive”), a resident of Massachusetts. Eastern Bankshares and the Bank are sometimes referred to

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 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the r

Eastern Bankshares, Inc. Reports Second Quarter 2023 Financial Results ~ Strong Margin Expansion the Result of the Prior Quarter’s Balance Sheet Repositioning ~ ~ Cash Raised in the Securities Sale Will Continue to Enhance the Company’s Financial Pos

Exhibit 99.1 Eastern Bankshares, Inc. Reports Second Quarter 2023 Financial Results ~ Strong Margin Expansion the Result of the Prior Quarter’s Balance Sheet Repositioning ~ ~ Cash Raised in the Securities Sale Will Continue to Enhance the Company’s Financial Position ~ BOSTON, July 27, 2023 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its affiliates and subsidiaries

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 EASTERN BANKSHARES,

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 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ☒ Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2022 OR ☐ Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission file number 001-39610 A.Full title of the plan and address o

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 15, 2023 EASTERN BANKSHARES,

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 15, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

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, 2023 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the

Eastern Bankshares, Inc. Reports First Quarter 2023 Financial Results ~ Strengthens Liquidity Through Balance Sheet Repositioning – Provides 107% Coverage of All Uninsured and Uncollateralized Deposits While Maintaining Strong Capital Position ~

Exhibit 99.1 Eastern Bankshares, Inc. Reports First Quarter 2023 Financial Results ~ Strengthens Liquidity Through Balance Sheet Repositioning – Provides 107% Coverage of All Uninsured and Uncollateralized Deposits While Maintaining Strong Capital Position ~ BOSTON, April 27, 2023 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its affiliates and subsidiaries, “Eastern”

Regulation FD Disclosure, 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 27, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

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 ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

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 ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

ARS

1 EASTERN BANKSHARES, INC. ANNUAL REPORT4 EASTERN BANKSHARES, INC. 2 EASTERN BANKSHARES, INC. We embrace our culture and creative spirit to build lasting relationships with our customers, colleagues and communities in pursuit of a better, fairer, more sustainable world. VISION We do good things to help people prosper. PURPOSE Integrity Diversity, Equity & Inclusion Innovation Commitment Teamwork V

Subsidiaries of Eastern Bankshares, Inc.

Exhibit 21 Subsidiaries of Eastern Bankshares, Inc. As of February 24, 2023, the Registrant owned the following subsidiaries: Name State of Incorporation Names under which Subsidiary does Business Eastern Bank Massachusetts Eastern Bank Eastern Insurance Group LLC Massachusetts Eastern Insurance Group Broadway Securities Corporation Massachusetts Broadway Securities Corporation Market Street Secur

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

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, 2022 Or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the regis

EBC / Eastern Bankshares, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0783-easternbanksharesinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)* Name of issuer: Eastern Bankshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 27627N105 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to

EBC / Eastern Bankshares, Inc. / PRINCIPAL FINANCIAL GROUP INC - SC13G/A EASTERN BANKSHARES INC AMDT 2 123122 Passive Investment

CUSIP No. 27627N105 13G/A Page 1 of 5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Eastern Bankshares, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 27627N105 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Ch

EBC / Eastern Bankshares, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us27627n1054020623.txt us27627n1054020623.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 2) Eastern Bankshares, Inc - (Name of Issuer) Common Stock - (Title of Class of Securities) 27627N105 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appropriat

Regulation FD Disclosure, 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): January 26, 2023 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

EASTERN BANKSHARES, INC. AND SUBSIDIARIES SELECTED FINANCIAL HIGHLIGHTS

Exhibit 99.1 Eastern Bankshares, Inc. Reports Fourth Quarter 2022 Financial Results Company Declares Quarterly Cash Dividend BOSTON, January 26, 2023 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its affiliates and subsidiaries, “Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2022 fourth quarter financial r

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 6, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): November 28, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organ

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, 2022 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of

EASTERN BANKSHARES, INC. AND SUBSIDIARIES SELECTED FINANCIAL HIGHLIGHTS

Exhibit 99.1 Eastern Bankshares, Inc. Reports Third Quarter 2022 Financial Results Company Declares Quarterly Cash Dividend BOSTON, October 27, 2022 (BUSINESS WIRE) — Eastern Bankshares, Inc. (the “Company,” or together with its affiliates and subsidiaries, “Eastern”) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2022 third quarter financial res

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 1

ebc-20220930xq32022earni DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 168 / 171 103 / 086 / 164 208 / 210 / 211 238 / 184 / 028 Q3 Earnings Presentation October 27 | 2022 Exhibit 99.

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 27, 2022 EASTERN BANKSHAR

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 27, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

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 7, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organ

# # #

Exhibit 99.1 Eastern Bankshares, Inc. Announces New Share Repurchase Program BOSTON, MA, September 7, 2022 ? Eastern Bankshares, Inc. (?Eastern? or the ?Company?) (Nasdaq Global Select Market: EBC), the stock holding company for Eastern Bank, today announced that it has received regulatory non-objection to proceed with a new share repurchase program, under which the Company is authorized to purcha

Form of Change in Control Agreement with executive officers employed by Eastern Bank for new agreements entered into from and after June 15, 2022

Exhibit 10.1 CHANGE IN CONTROL AGREEMENT This Change in Control Agreement (this ?Agreement?) is made as of the day of , , by and among Eastern Bankshares, Inc., a Massachusetts corporation (?Eastern Bankshares?), its wholly-owned subsidiary, Eastern Bank, a Massachusetts-chartered bank (the ?Bank?), and (the ?Executive?), residing in Massachusetts. Eastern Bankshares and the Bank are sometimes ref

Restated Articles of Organization, as adopted October 5, 2020, as amended May 16, 2022, incorporated herein by reference to Exhibit 3.1 to Form 10-Q filed on August 5, 2022

Exhibit 3.1 Pro Forma Restated Articles of Organization reflecting Articles of Amendment dated May 16, 2022. The Commonwealth of Massachusetts William Francis Galvin Secretary of the Commonwealth One Ashburton Place, Boston, Massachusetts 02108-1512 ONE ASHBURTON PLACE, BOSTON, MASSACHUSETTS Restated Articles of Organization (General Laws Chapter 156D, Section 10.07; 950 CMR 113.35) (1) Exact name

Form of Change in Control Agreement with executive officers employed by Eastern Insurance Group LLC for new agreements entered into from and after June 15, 2022

Exhibit 10.2 CHANGE IN CONTROL AGREEMENT This Separation Agreement and Release (this ?Agreement?) is entered into as of , by and among Eastern Bankshares, Inc., a Massachusetts corporation (?Eastern Bankshares?), Eastern Bank, a Massachusetts-chartered bank and a wholly owned subsidiary of Eastern Bankshares (the ?Bank?), Eastern Insurance Group LLC, a Massachusetts limited liability company and a

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, 2022 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the r

Regulation FD Disclosure, 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 28, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizat

EASTERN BANKSHARES, INC. AND SUBSIDIARIES SELECTED FINANCIAL HIGHLIGHTS

Exhibit 99.1 Eastern Bankshares, Inc. Reports Second Quarter 2022 Financial Results Company Declares Quarterly Cash Dividend BOSTON, July 28, 2022 (BUSINESS WIRE) ? Eastern Bankshares, Inc. (the ?Company,? or together with its affiliates and subsidiaries, ?Eastern?) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2022 second quarter financial resu

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 1

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 168 / 171 103 / 086 / 164 208 / 210 / 211 238 / 184 / 028 Q2 Earnings Presentation July 28 | 2022 Exhibit 99.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ? Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2021 OR ? Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission file number 001-39610 A.Full title of the plan and address o

Financial Statements and Exhibits, 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 16, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organizati

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, 2022 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the

Regulation FD Disclosure, 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 28, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

EASTERN BANKSHARES, INC. AND SUBSIDIARIES SELECTED FINANCIAL HIGHLIGHTS

Exhibit 99.1 Eastern Bankshares, Inc. Reports First Quarter 2022 Financial Results Company Declares Quarterly Cash Dividend BOSTON, April 28, 2022 (BUSINESS WIRE) ? Eastern Bankshares, Inc. (the ?Company,? or together with its affiliates and subsidiaries, ?Eastern?) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2022 first quarter financial resul

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 1

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 168 / 171 103 / 086 / 164 208 / 210 / 211 238 / 184 / 028 Q1 Earnings Presentation April 28 | 2022 Exhibit 99.

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 ? Confide

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): April 21, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

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 ? Confide

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 ? Confide

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 ? Confide

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 21, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organiza

Subsidiaries of Eastern Bankshares, Inc.

Exhibit 21 Subsidiaries of Eastern Bankshares, Inc. As of February 25, 2022, the Registrant owned the following subsidiaries: Name State of Incorporation Names under which Subsidiary does Business Eastern Bank Massachusetts Eastern Bank Eastern Insurance Group LLC Massachusetts Eastern Insurance Group Broadway Securities Corporation Massachusetts Broadway Securities Corporation Market Street Secur

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

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, 2021 Or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-39610 Eastern Bankshares, Inc. (Exact name of the regis

EBC / Eastern Bankshares, Inc. / PRINCIPAL FINANCIAL GROUP INC - 13G/A EASTERN BANKSHARES INC. AMDT 1 123121 Passive Investment

CUSIP No. 27627N105 13G/A Page 1 of 5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Eastern Bankshares, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 27627N105 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Ch

EBC / Eastern Bankshares, Inc. / 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.: 1)* Name of issuer: Eastern Bankshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 27627N105 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is file

EBC / Eastern Bankshares, Inc. / BlackRock Inc. Passive Investment

us27627n1054020322.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 1) EASTERN BANKSHARES INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 27627N105 - (CUSIP Number) December 31, 2021 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuan

Regulation FD Disclosure, 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): January 27, 2022 EASTERN BANKSHARES, INC. (Exact Name of Registrant as Specified in Charter) Massachusetts 001-39610 84-4199750 (State or Other Jurisdiction of Incorporation or Organi

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 1

DO NOT REFRESH Color PaletteComplementary 000 / 000 / 051 Body text 074 / 075 / 076 030 / 152 / 213 185 / 197 / 212 023 / 061 / 110 119 / 139 / 154 255 / 107 / 000109 / 110 / 112 237 / 237 / 238 000 / 139 / 151 137 / 139 / 141 197 / 064 / 044 166 / 168 / 171 103 / 086 / 164 208 / 210 / 211 238 / 184 / 028 Q4 Earnings Presentation January 27 | 2022 Exhibit 99.

EASTERN BANKSHARES, INC. AND SUBSIDIARIES SELECTED FINANCIAL HIGHLIGHTS

Exhibit 99.1 Eastern Bankshares, Inc. Reports Fourth Quarter 2021 Financial Results Company Announces a 25% Increase to Quarterly Dividend BOSTON, January 27, 2022 (BUSINESS WIRE) ? Eastern Bankshares, Inc. (the ?Company,? or together with its affiliates and subsidiaries, ?Eastern?) (NASDAQ Global Select Market: EBC), the stock holding company of Eastern Bank, today announced its 2021 fourth quart

Exhibit 99.3 PART I – Item 1 Century Bancorp, Inc. Consolidated Balance Sheets (unaudited) (In thousands, except share data) Assets September 30, 2021 December 31, 2020 Cash and due from banks $ 97,743 $ 136,735 Federal funds sold and interest-bearin

Exhibit 99.3 PART I ? Item 1 Century Bancorp, Inc. Consolidated Balance Sheets (unaudited) (In thousands, except share data) Assets September 30, 2021 December 31, 2020 Cash and due from banks $ 97,743 $ 136,735 Federal funds sold and interest-bearing deposits in other banks 492,243 237,265 Total cash and cash equivalents 589,986 374,000 Securities available-for-sale, amortized cost $202,720 and $