ALSN / Allison Transmission Holdings, Inc. - SEC-Einreichungen, Jahresbericht, Proxy Statement

Allison Transmission Holdings, Inc.
US ˙ NYSE ˙ US01973R1014

Basisstatistiken
LEI 529900RP7DJ882LI9T83
CIK 1411207
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Allison Transmission Holdings, Inc.
SEC Filings (Chronological Order)
Auf dieser Seite finden Sie eine vollständige, chronologische Liste der SEC-Einreichungen, mit Ausnahme der Eigentumseinreichungen, die wir an anderer Stelle bereitstellen.
May 29, 2026 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction o

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction of incorporation) (Commission File Number) One Allison Way, Indianapolis, Indiana 46222 (Address of principal executive offices) (Zip Code) Eric C.

May 29, 2026 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2025

EX-1.01 Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2025 This Conflict Minerals Report for the year ended December 31, 2025 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to implement reporting and discl

May 8, 2026 8-K

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 6, 2026 ALLISON TRANSMISSION

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 6, 2026 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Co

May 7, 2026 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (

May 4, 2026 8-K

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 4, 2026 ALLISON TRANSMISSION

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 4, 2026 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Co

May 4, 2026 EX-99.1

Allison Announces First Quarter 2026 Results

EX-99.1 Exhibit 99.1 News Release Allison Announces First Quarter 2026 Results * Net Sales of $1,406 million, up 84% year over year, including the addition of the Allison Off-Highway business unit acquired on January 1, 2026 * Net Income of $112 million, 8% of Net Sales * Diluted EPS of $1.33, Adjusted Diluted EPS of $2.57, up 6% year over year * Adjusted EBITDA of $362 million, 26% of Net Sales,

May 4, 2026 EX-99.2

Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and that do not

EX-99.2 Q1 2026 Earnings Release May 4, 2026 Dave Graziosi – Chair, President & CEO Scott Mell – CFO & Treasurer Fred Bohley – COO & Allison Transmission President Craig Price – Allison Off-Highway President Exhibit 99.2 Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that a

March 25, 2026 DEF 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential, for Use of the Commission Only (as perm

March 25, 2026 ARS

ARS

2025 ANNUAL REPORT(1) 2025 financial results do not reflect the impact from the acquisition of Dana Corporation's Off-Highway business.

March 25, 2026 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION 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 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(

March 16, 2026 EX-99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

EX-99.3 Exhibit 99.3 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The following unaudited pro forma condensed combined financial information has been prepared to give effect to the Transactions as discussed further below. The pro forma adjustments are based on the information available and certain assumptions that management believes are reasonable under the circumstances. The assu

March 16, 2026 EX-99.1

OFF-HIGHWAY BUSINESS OF DANA INCORPORATED COMBINED FINANCIAL STATEMENTS

EX-99.1 Exhibit 99.1 OFF-HIGHWAY BUSINESS OF DANA INCORPORATED COMBINED FINANCIAL STATEMENTS Contents REPORT OF INDEPENDENT AUDITORS 2 COMBINED STATEMENT OF OPERATIONS 4 COMBINED STATEMENT OF COMPREHENSIVE INCOME 5 COMBINED BALANCE SHEET 6 COMBINED STATEMENT OF CASH FLOWS 7 COMBINED STATEMENT OF CHANGES IN EQUITY 8 NOTE 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 9 NOTE 2. GOODW

March 16, 2026 EX-99.2

OFF-HIGHWAY BUSINESS OF DANA INCORPORATED UNAUDITED CONDENSED COMBINED FINANCIAL STATEMENTS September 30, 2025 and September 30, 2024

EX-99.2 Exhibit 99.2 OFF-HIGHWAY BUSINESS OF DANA INCORPORATED UNAUDITED CONDENSED COMBINED FINANCIAL STATEMENTS September 30, 2025 and September 30, 2024 OFF-HIGHWAY BUSINESS OF DANA INCORPORATED UNAUDITED CONDENSED COMBINED FINANCIAL STATEMENTS Contents CONDENSED COMBINED STATEMENT OF OPERATIONS (UNAUDITED) 3 CONDENSED COMBINED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) 4 CONDENSED COMBINED B

March 16, 2026 8-K/A

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): January 1, 20

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): January 1, 2026 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdicti

February 24, 2026 EX-21.1

List of Subsidiaries

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 24, 2026 10-K

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact

February 24, 2026 EX-10.33

anti-bribery and corruption policy and procedures

Exhibit 10.33 Dated 12 January 2026 DANA UK DRIVESHAFT LIMITED and CRAIG PRICE SERVICE AGREEMENT London 99 Bishopsgate London EC2M 3XF (44) 020 7710 1000 (Tel) www.lw.com |EU-DOCS\56996824.2|| | 888349-0000|| Exhibit 10.33 THIS AGREEMENT is made on 12 January 2026 BETWEEN (1) DANA UK DRIVESHAFT LIMITED, a company registered in England with registered number 06088797 and having its registered offic

February 23, 2026 EX-99.2

Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and that do not

EX-99.2 Q4 2025 Earnings Release February 23rd, 2026 Dave Graziosi – Chair, President & CEO Scott Mell – CFO & Treasurer Fred Bohley – Allison Transmission President & COO Craig Price – Allison Off-Highway President Exhibit 99.2 Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expression

February 23, 2026 8-K

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 23, 2026 ALLISON TRANSMI

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 23, 2026 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporatio

February 23, 2026 EX-99.1

Allison Transmission Announces Fourth Quarter and Full Year 2025 Results

EX-99.1 Exhibit 99.1 News Release Allison Transmission Announces Fourth Quarter and Full Year 2025 Results * Record fourth quarter and full year Net Sales in the Outside North America On-Highway end market * Continued strength in the Defense end market, with full year Net Sales of $267 million, a year over year increase of 26 percent * Full year Net Income of $623 million, 21% of Net Sales * Full

January 2, 2026 EX-99.1

Allison Transmission Completes Acquisition of Dana Incorporated’s Off-Highway Drive & Motion Systems Business, Creating a Premier, Global Industrial Leader Combined company to form $5.5 billion revenue global enterprise with operations spanning 29 co

EX-99.1 Exhibit 99.1 Allison Transmission Completes Acquisition of Dana Incorporated’s Off-Highway Drive & Motion Systems Business, Creating a Premier, Global Industrial Leader Combined company to form $5.5 billion revenue global enterprise with operations spanning 29 countries Global footprint positioned to meet growing demand for advanced high-performance mobility and work solutions across infra

January 2, 2026 EX-10.1

AMENDMENT NO. 5 TO CREDIT AGREEMENT

EX-10.1 Exhibit 10.1 Execution Version AMENDMENT NO. 5 TO CREDIT AGREEMENT AMENDMENT NO. 5 TO CREDIT AGREEMENT, dated as of January 2, 2026 (this “Amendment”), by and among ALLISON TRANSMISSION, INC., a Delaware corporation (the “Borrower”), ALLISON TRANSMISSION HOLDINGS, INC., a Delaware corporation (“Holdings”), CITIBANK, N.A., as administrative agent (in such capacity, the “Administrative Agent

January 2, 2026 8-K

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 1, 2026 ALLISON TRANSMISS

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 1, 2026 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation)

November 24, 2025 EX-4.1

ALLISON TRANSMISSION, INC. as Issuer Dated as of November 21, 2025 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee

EX-4.1 Exhibit 4.1 Execution Version ALLISON TRANSMISSION, INC. as Issuer INDENTURE Dated as of November 21, 2025 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee TABLE OF CONTENTS Page ARTICLE I Definitions and Incorporation by Reference SECTION 1.1. Definitions 1 SECTION 1.2. Other Definitions 29 SECTION 1.3. Rules of Construction. Unless the context otherwise requires: 30 ARTICLE II The Notes

November 24, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 21, 2025 ALLISON TRANSMI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 21, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporatio

November 7, 2025 EX-99.1

Allison Transmission Prices Offering of $500 Million Aggregate Principal Amount of 5.875% Senior Notes Due 2033 and $1,200 Million Senior Secured Incremental Term Loan Facility

EX-99.1 Exhibit 99.1 Allison Transmission Prices Offering of $500 Million Aggregate Principal Amount of 5.875% Senior Notes Due 2033 and $1,200 Million Senior Secured Incremental Term Loan Facility INDIANAPOLIS, November 6, 2025 – Allison Transmission Holdings, Inc. (NYSE: ALSN) (“Allison” or the “Company”) today announced that its wholly owned subsidiary, Allison Transmission, Inc. (the “Issuer”)

November 7, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2025 ALLISON TRANSMISSI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2025 ALLISON TRANSMISSION HOLDINGS, INC.

November 4, 2025 EX-99.1

SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS

EX-99.1 Exhibit 99.1 SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995) including, without limitation, information concerning possible or assumed future results of operations, including our ability to achieve the synergies reflected

November 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 4, 2025 ALLISON TRANSMISSI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 4, 2025 ALLISON TRANSMISSION HOLDINGS, INC.

October 31, 2025 EX-99.1

Historical Financials(1) Allison Dana OH Run-Rate Synergies ($120mm) Pro Forma Net Sales Pro Forma Adj. EBITDA(2) ($ in millions) ($ in millions) % Margin 25.5% 26.6% 28.5%(3) $6,120 $5,921 $5,675 $1,618 $1,560 $1,573 $120(3) $3,085 $2,696 $2,475 $45

EX-99.1 Exhibit 99.1 Historical Financials(1) Allison Dana OH Run-Rate Synergies ($120mm) Pro Forma Net Sales Pro Forma Adj. EBITDA(2) ($ in millions) ($ in millions) % Margin 25.5% 26.6% 28.5%(3) $6,120 $5,921 $5,675 $1,618 $1,560 $1,573 $120(3) $3,085 $2,696 $2,475 $452 $408 $314 $3,035 $3,225 $3,200 $1,108 $1,165 $1,184 FY 2023 FY 2024 LTM Q2 2025 FY 2023 FY 2024(5) LTM Q2 2025(5) Capital Expen

October 31, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 30, 2025 ALLISON TRANSMISSI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 30, 2025 ALLISON TRANSMISSION HOLDINGS, INC.

October 30, 2025 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, IN

October 29, 2025 EX-99.2

Q3 2025 Earnings Release October 29th, 2025 [Graphic Appears Here] Dave Graziosi, Chair & CEO Fred Bohley, COO Scott Mell, CFO & Treasurer

EX-99.2 Exhibit 99.2 Q3 2025 Earnings Release October 29th, 2025 [Graphic Appears Here] Dave Graziosi, Chair & CEO Fred Bohley, COO Scott Mell, CFO & Treasurer Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and th

October 29, 2025 EX-99.1

Allison Transmission Announces Third Quarter 2025 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Third Quarter 2025 Results • Net Sales of $78 million in the Defense end market, up over 47% year over year • Net Income of $137 million, 19.8% of Net Sales • Achieved Adjusted EBITDA margin of 37% despite challenging demand environment • Net Cash Provided by Operating Activities of $228 million • Adjusted Free Cash Flow of $184 million INDIANAPO

October 29, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 29, 2025 ALLISON TRANSMIS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 29, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation

September 30, 2025 144

144

144 0001687117 XXXXXXXX LIVE 0001411207 Allison Transmission Holdings Inc 001-35456 ONE ALLISON WAY Indianapolis IN 46222 (317) 242-5000 Coll John Officer Common Stock Merrill Lynch 225 Liberty St Floor 37 New York NY 10281 1788 150764.

August 5, 2025 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (E

August 4, 2025 EX-99.1

Allison Transmission Announces Second Quarter 2025 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Second Quarter 2025 Results * Announced definitive agreement for transformational acquisition of Dana Incorporated’s Off-Highway business * Net Income of $195 million, up 4% year over year, and 24% of Net Sales, up over 100 basis points year over year * Diluted EPS of $2.29, a quarterly record, up 8% year over year * Adjusted EBITDA margin of 38.

August 4, 2025 8-K

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 4, 2025 ALLISON TRANSMISSI

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 4, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Com

August 4, 2025 EX-99.2

Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and that do not

EX-99.2 Q2 2025 Earnings Release August 4th, 2025 Dave Graziosi, Chair & CEO Fred Bohley, COO Scott Mell, CFO & Treasurer Exhibit 99.2 Safe Harbor Statement The following information contains forward-looking statements. The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expressions that are predictions of or indicate future events and trends and that do not relate to histo

June 13, 2025 EX-2.1

Stock Purchase Agreement, dated June 11, 2025, by and between Dana Incorporated and Allison Transmission Holdings, Inc.

Exhibit 2.1 CONFIDENTIAL Execution Version STOCK PURCHASE AGREEMENT by and between DANA INCORPORATED and ALLISON TRANSMISSION HOLDINGS, INC. Dated as of June 11, 2025 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS; INTERPRETATION Section 1.1 Defined Terms 1 Section 1.2 Other Definitions 23 ARTICLE II THE SALE Section 2.1 Sale and Purchase 26 Section 2.2 Closing Purchase Price 26 Section 2.3 Closing

June 13, 2025 8-K

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): June 11, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

June 11, 2025 8-K

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 11, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

June 11, 2025 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Acquisition of Dana Off-Highway Business June 11, 2025 Dave Graziosi, Chair & CEO Fred Bohley, COO Scott Mell, CFO & Treasurer Exhibit 99.

June 11, 2025 EX-99.1

Allison Transmission Announces Acquisition of Dana’s Off-Highway Business, Strengthening its Global Powertrain Capabilities

Exhibit 99.1 Allison Transmission Announces Acquisition of Dana’s Off-Highway Business, Strengthening its Global Powertrain Capabilities INDIANAPOLIS, June 11, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN) today announced it has entered into a definitive agreement to acquire the Off-Highway business of Dana Incorporated, a leading provider of drivetrain and propulsion solutions, for appro

May 30, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction o

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction of incorporation) (Commission File Number) One Allison Way, Indianapolis, Indiana 46222 (Address of principal executive offices) (Zip Code) Eric C. Scr

May 30, 2025 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2024

Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2024 This Conflict Minerals Report for the year ended December 31, 2024 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to implement reporting and disclosure re

May 9, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2025 ALLISON TRANSMISSION

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commis

May 9, 2025 EX-3.1

Certificate of Amendment to Second Amended and Restated Certificate of Incorporation of Allison Transmission Holdings, Inc.

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ALLISON TRANSMISSION HOLDINGS, INC. Allison Transmission Holdings, Inc. (the “Corporation”), a corporation organized and existing under the General Corporation Law of the State of Delaware, DOES HEREBY CERTIFY THAT: 1. The Board of Directors of the Corporation (the “Board”) duly adopted resolutions

May 2, 2025 EX-10.1

Form of 2025 Equity Incentive Award Plan Performance Stock Unit Agreement (filed herewith)

Exhibit 10.1 ALLISON TRANSMISSION HOLDINGS, INC. 2024 EQUITY INCENTIVE AWARD PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2024 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of performance stock units (the “PSUs”) set

May 2, 2025 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (

May 1, 2025 EX-99.1

Allison Transmission Announces First Quarter 2025 Results

Exhibit 99.1 Allison Transmission Announces First Quarter 2025 Results * Net Income of $192 million, up 14% year over year, and 25.1% of Net Sales, up 370 basis points year over year * Diluted EPS of $2.23, up 17% year over year * Adjusted EBITDA margin of 37.5%, up 90 basis points year over year INDIANAPOLIS, May 1, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN), today reported first quar

May 1, 2025 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q1 2025 Earnings Release May 1st, 2025 Dave Graziosi, Chair & CEO Fred Bohley, COO Scott Mell, CFO & Treasurer Exhibit 99.

May 1, 2025 8-K

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 1, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commis

April 10, 2025 EX-99.1

Allison Transmission Announces Scott Mell as New Chief Financial Officer

Exhibit 99.1 Allison Transmission Announces Scott Mell as New Chief Financial Officer INDIANAPOLIS, April 10, 2025 – Allison Transmission (ALSN), a leading designer and manufacturer of commercial and defense vehicle propulsion solutions, announces the appointment of Scott Mell as its new Chief Financial Officer (CFO) and Treasurer, effective April 14, 2025. This announcement follows the June 2024

April 10, 2025 8-K

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 10, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation)

April 7, 2025 DEFA14A

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

March 26, 2025 ARS

ARS

The Propulsion Solution Provider of Choice 2024 Annual Report2024 Net Sales % by End Market Adjusted Free Cash Flow (NON-GAAP) 1 (dollars in millions) $490 $659 $658 2022 2023 2024 $961 $1,108 $1,165 Adjusted EBITDA (NON-GAAP) 1 (dollars in millions) 2022 2023 2024 $531 $673 $731 Net Income (dollars in millions) 2022 2023 2024 Providing the most reliable and valued propulsion solutions in the world Allison Transmission (NYSE: ALSN) is a leading designer and manufacturer of propulsion solutions for commercial and defense vehicles and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions that Improve the Way the World Works.

March 26, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION 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 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(

March 26, 2025 DEF 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential, for Use of the Commission Only (as perm

March 10, 2025 PRE 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential, for Use of the Commission Only (as permi

February 20, 2025 EX-99.1

Allison Transmission Announces 8% Increase to Quarterly Dividend, $1 Billion Increase to Stock Repurchase Authorization and the Annual Stockholders Meeting and Record Date

Exhibit 99.1 News Release Allison Transmission Announces 8% Increase to Quarterly Dividend, $1 Billion Increase to Stock Repurchase Authorization and the Annual Stockholders Meeting and Record Date INDIANAPOLIS, February 20, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of conventional and electrified vehicle propulsion solutions and the largest global

February 20, 2025 8-K

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 19, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

February 13, 2025 EX-19.1

Allison Insider Trading Policy (filed herewith)

Exhibit 19.1 Allison Insider Trading Policy Revised by the Board of Directors on September 13, 2023 Insider Trading Policy Purpose: This Insider Trading Policy (the “Policy”) is designed to prevent individuals from trading in Allison securities while in possession of material non-public information about Allison in violation of U.S. securities laws. Key Provisions: • This Policy applies to trades

February 13, 2025 EX-21.1

List of Subsidiaries of Allison Transmission Holdings, Inc. (filed herewith)

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 13, 2025 EX-19.2

Addendum to Insider Trading Policy (filed herewith)

Exhibit 19.2 ADDENDUM TO INSIDER TRADING POLICY Additional Requirements and Responsibilities for Section 16 Reporting Persons Revised by the Board of Directors on September 13, 2023 Page 1 of 12 Exhibit 19.2 Purpose: This Addendum supplements Allison’s Insider Trading Policy and is designed to ensure compliance with Section 16 (“Section 16”) of the Securities Exchange Act of 1934, as amended (the

February 13, 2025 10-K

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact

February 11, 2025 EX-99.1

Allison Transmission Announces Record Fourth Quarter and Full Year 2024 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Record Fourth Quarter and Full Year 2024 Results * Record fourth quarter net sales of $796 million, leading to all-time high full year net sales of $3.2 billion * Record full year diluted EPS of $8.31, up 12% year over year INDIANAPOLIS, February 11, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN) today reported all-time high full year net

February 11, 2025 8-K

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 11, 2025 ALLISON TRANSMI

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 11, 2025 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

February 11, 2025 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 Q4 2024 Earnings Release February 11th, 2025 Dave Graziosi, Chair & CEO Fred Bohley, COO, CFO & Treasurer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “estimate” and other expres

November 12, 2024 SC 13G/A

ALSN / Allison Transmission Holdings, Inc. / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.12 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 11,695,682 Item 6: 0 Item 7: 12,745,693 Ite

October 30, 2024 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, IN

October 29, 2024 8-K

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 29, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (C

October 29, 2024 EX-99.1

Allison Transmission Announces Third Quarter 2024 Results

Exhibit 99.1 Allison Transmission Announces Third Quarter 2024 Results * Record quarterly net sales of $824 million, up 12% year over year * Net Income of $200 million, up 27% year over year * Diluted EPS of $2.27, a quarterly record, up 29% year over year * Increasing full year 2024 revenue, earnings and cash flow guidance INDIANAPOLIS, October 29, 2024 – Allison Transmission Holdings Inc. (NYSE:

October 29, 2024 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q3 2024 Earnings Release October 29th, 2024 Dave Graziosi, Chair & CEO Fred Bohley, COO, CFO & Treasurer Exhibit 99.

July 26, 2024 EX-10.2

Eighth Amended and Restated Non-Employee Director Compensation Policy (filed herewith)

Exhibit 10.2 ALLISON TRANSMISSION HOLDINGS, INC. Eighth Amended and Restated Non-Employee Director Compensation Policy 1. General. This Eighth Amended and Restated Non-Employee Director Compensation Policy (the “Policy”) as set forth herein, amends and restates that certain Seventh Amended and Restated Non-Employee Director Compensation Policy, previously adopted by the Compensation Committee of t

July 26, 2024 EX-10.3

Form of 2024 Equity Incentive Award Plan Restricted Stock Unit Agreement (filed herewith)

Exhibit 10.3 ALLISON TRANSMISSION HOLDINGS, INC. 2024 EQUITY INCENTIVE AWARD PLAN RESTRICTED STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2024 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of Restricted Stock Units (the “RSUs”) set fo

July 26, 2024 EX-10.4

Form of 2024 Equity Incentive Award Plan Stock Option Agreement (filed herewith)

Exhibit 10.4 ALLISON TRANSMISSION HOLDINGS, INC. 2024 EQUITY INCENTIVE AWARD PLAN STOCK OPTION GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation, (the “Company”), pursuant to its 2024 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”), an option to purchase the number of shares of Common Stock (“St

July 26, 2024 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (E

July 26, 2024 EX-10.5

Form of 2024 Equity Incentive Award Plan Performance Stock Unit Agreement (filed herewith)

Exhibit 10.5 ALLISON TRANSMISSION HOLDINGS, INC. 2024 EQUITY INCENTIVE AWARD PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2024 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of performance stock units (the “PSUs”) set

July 25, 2024 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q2 2024 Earnings Release July 25th, 2024 Dave Graziosi, Chair & CEO Fred Bohley, COO, CFO & Treasurer Exhibit 99.

July 25, 2024 8-K

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): July 25, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Comm

July 25, 2024 EX-99.1

Allison Transmission Announces Second Quarter 2024 Results

EXHIBIT 99.1 Allison Transmission Announces Second Quarter 2024 Results * Record quarterly net sales of $816 million, up 4% year over year * Diluted EPS of $2.13, up 11% year over year * Increasing full year 2024 revenue, earnings and cash flow guidance INDIANAPOLIS, July 25, 2024 – Allison Transmission Holdings Inc. (NYSE: ALSN), today reported second quarter net sales of $816 million, a quarterl

June 4, 2024 8-K

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 3, 2024 ALLISON TRANSMISSION

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 3, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Its Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (C

June 4, 2024 EX-99.1

Allison Transmission Announces G. Frederick Bohley as New Chief Operating Officer

EX-99.1 Exhibit 99.1 Allison Transmission Announces G. Frederick Bohley as New Chief Operating Officer INDIANAPOLIS, June 4, 2024 – Allison Transmission Holdings, Inc. (NYSE: ALSN), a global leader in commercial-duty automatic transmissions, electric and hybrid propulsion solutions, is pleased to announce the appointment of G. Frederick (Fred) Bohley III as the new Chief Operating Officer (COO), e

May 31, 2024 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2023

Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2023 This Conflict Minerals Report for the year ended December 31, 2023 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to implement reporting and disclosure re

May 31, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction o

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 (State or other jurisdiction of incorporation) (Commission File Number) One Allison Way, Indianapolis, Indiana 46222 (Address of principal executive offices) (Zip Code) Eric C. Scr

May 10, 2024 EX-10.1

Allison Transmission Holdings, Inc. 2024 Equity Incentive Award Plan

EXHIBIT 10.1 ALLISON TRANSMISSION HOLDINGS, INC. 2024 EQUITY INCENTIVE AWARD PLAN ARTICLE 1. PURPOSE The purpose of the Allison Transmission Holdings, Inc. 2024 Equity Incentive Award Plan (as it may be amended or restated from time to time, the “Plan”) is to promote the success and enhance the value of Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), by linking the ind

May 10, 2024 8-K

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 8, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commis

April 26, 2024 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (

April 26, 2024 EX-10.3

Form of 2015 Equity Incentive Award Plan Stock Option Agreement (revised 2024) (filed herewith)

Exhibit 10.3 ALLISON TRANSMISSION HOLDINGS, INC. 2015 EQUITY INCENTIVE AWARD PLAN STOCK OPTION GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation, (the “Company”), pursuant to its 2015 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”), an option to purchase the number of shares of Common Stock (“St

April 26, 2024 EX-10.4

Form of 2015 Equity Incentive Award Plan Performance Stock Unit Agreement (revised 2024) (filed herewith)

Exhibit 10.4 ALLISON TRANSMISSION HOLDINGS, INC. 2015 EQUITY INCENTIVE AWARD PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2015 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of performance stock units (the “PSUs”) set

April 26, 2024 EX-10.2

Form of 2015 Equity Incentive Award Plan Restricted Stock Unit Agreement (revised 2024) (filed herewith)

Exhibit 10.2 ALLISON TRANSMISSION HOLDINGS, INC. 2015 EQUITY INCENTIVE AWARD PLAN RESTRICTED STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2015 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of Restricted Stock Units (the “RSUs”) set fo

April 25, 2024 8-K

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): April 25, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Com

April 25, 2024 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q1 2024 Earnings Release April 25th, 2024 Dave Graziosi, Chair & CEO Fred Bohley, Senior Vice President, CFO & Treasurer Exhibit 99.

April 25, 2024 EX-99.1

Allison Transmission Announces First Quarter 2024 Results

Exhibit 99.1 Allison Transmission Announces First Quarter 2024 Results * Record net sales of $789 million * Diluted EPS of $1.90, which includes $0.13 impact from $14 Million of Non-Recurring UAW Contract Signing Incentives incurred in the quarter * Refinanced Revolving Credit Facility and Term Loan, Paying Down $101 Million of Outstanding Debt INDIANAPOLIS, April 25, 2024 – Allison Transmission H

March 29, 2024 DEF 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential, for Use of the Commission Only (as perm

March 29, 2024 ARS

ARS

The Propulsion Solution Provider of Choice 2023 Annual ReportAllison Transmission (NYSE: ALSN) is a leading designer and manufacturer of propulsion solutions for commercial and defense vehicles and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions that Improve the Way the World Works.

March 29, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION 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 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(

March 18, 2024 8-K

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): March 13, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Its Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation)

March 18, 2024 EX-10.1

Amendment No. 4 to Credit Agreement, dated March 13, 2024, by and among Allison Transmission Inc., Allison Transmission Holdings, Inc., and Citibank N.A., as administrative agent, to the Second Amended and Restated Credit Agreement, dated as of March 29, 2019, among Allison Transmission Holdings, Inc., Allison Transmission, Inc., as borrower, the several banks and other financial institutions or entities from time to time parties thereto as lenders and Citibank, N.A., as administrative agent

Exhibit 10.1 EXECUTION VERSION AMENDMENT NO. 4 TO CREDIT AGREEMENT AMENDMENT NO. 4 TO CREDIT AGREEMENT, dated as of March 13, 2024 (this “Amendment”), by and among ALLISON TRANSMISSION, INC., a Delaware corporation (the “Borrower”), ALLISON TRANSMISSION HOLDINGS, INC., a Delaware corporation (“Holdings”), CITIBANK, N.A., as Administrative Agent (in such capacity, the “Administrative Agent”) and as

March 18, 2024 EX-99.1

Allison Transmission Announces Closing of Amend and Extend of its Revolving Credit Facility and Term Loan Debt

Exhibit 99.1 Allison Transmission Announces Closing of Amend and Extend of its Revolving Credit Facility and Term Loan Debt INDIANAPOLIS, March 18, 2024 – Allison Transmission Holdings Inc. (NYSE: ALSN) (“Allison” or the “Company”) announced today that, on March 13, 2024, its wholly owned subsidiary, Allison Transmission, Inc. (the “Borrower”), entered into a fourth amendment to its credit agreeme

February 14, 2024 EX-97

Allison Transmission Holdings, Inc. Policy for Recovery of Erroneously Awarded Compensation (filed herewith)

Exhibit 97 ALLISON TRANSMISSION HOLDINGS, INC. POLICY FOR RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION Allison Transmission Holdings, Inc. (the “Company”) has adopted this Policy for Recovery of Erroneously Awarded Compensation (the “Policy”), effective as of October 2, 2023 (the “Effective Date”), which Policy is an amendment and restatement of the Company’s Policy for Recoupment of Incentive Com

February 14, 2024 EX-10.14

Form of 2015 Equity Incentive Award Plan Performance Stock Unit Agreement (revised 2023) (filed herewith)

Exhibit 10.14 ALLISON TRANSMISSION HOLDINGS, INC. 2015 EQUITY INCENTIVE AWARD PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Allison Transmission Holdings, Inc., a Delaware corporation (the “Company”), pursuant to its 2015 Equity Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”) the number of performance stock units (the “PSUs”) set

February 14, 2024 EX-10.18

Seventh Amended and Restated Non-Employee Director Compensation Policy (filed herewith)

Exhibit 10.18 ALLISON TRANSMISSION HOLDINGS, INC. Seventh Amended and Restated Non-Employee Director Compensation Policy 1. General. This Seventh Amended and Restated Non-Employee Director Compensation Policy (the “Policy”) as set forth herein, amends and restates that certain Third Amended and Restated Non-Employee Director Compensation Policy, previously adopted by the Compensation Committee of

February 14, 2024 EX-21.1

List of Subsidiaries of Allison Transmission Holdings, Inc. (filed herewith)

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 14, 2024 EX-4.5

Description of Securities (filed herewith)

Exhibit 4.5 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of December 31, 2023, Allison Transmission Holdings, Inc. (“Allison,” “Company,” “we,” “us” and “our”) had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): its common stock, par value $0.01 per share

February 14, 2024 10-K

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact

February 13, 2024 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q4 2023 Earnings Release February 13th, 2024 Dave Graziosi, Chairman & CEO Fred Bohley, Senior Vice President, CFO & Treasurer Exhibit 99.

February 13, 2024 SC 13G/A

ALSN / Allison Transmission Holdings, Inc. / Burgundy Asset Management Ltd. - SC 13G/A Passive Investment

SC 13G/A 1 d757576dsc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* Allison Transmission Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

February 13, 2024 SC 13G/A

ALSN / Allison Transmission Holdings, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0231-allisontransmissionho.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: Allison Transmission Holdings Inc Title of Class of Securities: Common Stock CUSIP Number: 01973R101 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropr

February 13, 2024 8-K

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 13, 2024 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

February 13, 2024 EX-99.1

Allison Transmission Announces Record Fourth Quarter and Full Year 2023 Results

Exhibit 99.1 Allison Transmission Announces Record Fourth Quarter and Full Year 2023 Results • Record Full Year Net Sales of $3,035 million, up 10% from 2022 • Record Full Year Diluted EPS of $7.40, up 34% from 2022 • Record Fourth Quarter Net Sales of $775 million, up 8% year over year • Fourth Quarter Diluted EPS of $1.91, up 26% year over year INDIANAPOLIS, February 13, 2024 – Allison Transmiss

February 9, 2024 SC 13G/A

ALSN / Allison Transmission Holdings, Inc. / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.11 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 8,454,081 Item 6: 0 Item 7: 9,945,271 Item

October 26, 2023 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 001-35456 ALLISON TRANSMISSION HOLDINGS, IN

October 25, 2023 8-K

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 25, 2023 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (C

October 25, 2023 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q3 2023 Earnings Release October 25th, 2023 Dave Graziosi, Chairman & CEO Fred Bohley, Senior Vice President, CFO & Treasurer Exhibit 99.

October 25, 2023 EX-99.1

Allison Transmission Announces Third Quarter 2023 Results

EXHIBIT 99.1 Allison Transmission Announces Third Quarter 2023 Results * Net sales of $736 million, up 4% year over year * Net Income of $158 million, up 14% year over year * Diluted EPS of $1.76, up 21% year over year INDIANAPOLIS, October 25, 2023 – Allison Transmission Holdings Inc. (NYSE: ALSN), today reported third quarter net sales of $736 million, a 4 percent increase from the same period i

July 28, 2023 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exac

July 27, 2023 EX-99.1

Allison Transmission Announces Second Quarter 2023 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Second Quarter 2023 Results * Record quarterly net sales of $783 million, up 18% year over year * Net Income of $175 million, 22% of net sales, up 43% year over year * Diluted EPS of $1.92, up 52% year over year * Increasing 2023 Net Sales, Earnings and Cash Flow Guidance INDIANAPOLIS, July 27, 2023 – Allison Transmission Holdings Inc. (NYSE: ALS

July 27, 2023 8-K

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 ALLISON TRANSMISSIO

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 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Comm

July 27, 2023 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 Q2 2023 Earnings Release July 27, 2023 Dave Graziosi, Chairman & CEO Fred Bohley, Senior Vice President, CFO & Treasurer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “estimate” a

May 15, 2023 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2022

EX-1.01 2 d485926dex101.htm EX-1.01 Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2022 This Conflict Minerals Report for the year ended December 31, 2022 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to i

May 15, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) One Allison Way, Indianapolis, Indiana 46222 (Address of princi

May 5, 2023 EX-3.1

Amended and Restated Bylaws of Allison Transmission Holdings, Inc. (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed May 5, 2023)

EX-3.1 EXHIBIT 3.1 ALLISON TRANSMISSION HOLDINGS, INC. AMENDED AND RESTATED BYLAWS As Adopted on May 4, 2023 TABLE OF CONTENTS Page ARTICLE I MEETINGS OF STOCKHOLDERS 1 Section 1.01 Annual Meetings 1 Section 1.02 Special Meetings 1 Section 1.03 Participation in Meetings by Remote Communication 1 Section 1.04 Record Date; Notice of Meetings; Waiver of Notice 1 Section 1.05 Proxies 3 Section 1.06 Vo

May 5, 2023 8-K

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 3, 2023 ALLISON TRANSMISSION

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 3, 2023 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commis

April 28, 2023 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exa

April 27, 2023 8-K

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 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Com

April 27, 2023 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 Q1 2023 Earnings Release April 27th, 2023 Dave Graziosi, Chairman & CEO Fred Bohley, Senior Vice President, CFO & Treasurer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “estimate

April 27, 2023 EX-99.1

Allison Transmission Announces First Quarter 2023 Results

EX-99.1 EXHIBIT 99.1 Allison Transmission Announces First Quarter 2023 Results * Record quarterly net sales of $741 million, up 9% year over year * Diluted EPS of $1.85, up 42% year over year INDIANAPOLIS, April 27, 2023 – Allison Transmission Holdings Inc. (NYSE: ALSN), today reported first quarter net sales of $741 million, a 9 percent increase from the same period in 2022, and diluted EPS of $1

March 24, 2023 ARS

ARS

The Power of Choice 2022 Annual ReportProviding the most reliable and valued propulsion solutions in the world Allison Transmission (NYSE: ALSN) is a leading designer and manufacturer of propulsion solutions for commercial and defense vehicles and the largest global manufacturer of medium- and heavy-duty fully automatic transmissions that Improve the Way the World Works.

March 24, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION 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 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  ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-

March 24, 2023 DEF 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential, for Use of the Commission Only (as perm

March 6, 2023 8-K

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, 2023 ALLISON TRANSMI

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, 2023 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

March 6, 2023 EX-10.1

Amendment No. 3 to Credit Agreement, dated February 28, 2023, by and among Allison Transmission Inc., Allison Transmission Holdings, Inc., and Citibank N.A., as administrative agent, to the Second Amended and Restated Credit Agreement, dated as of March 29, 2019, among Allison Transmission Holdings, Inc., Allison Transmission, Inc., as borrower, the several banks and other financial institutions or entities from time to time parties thereto as lenders and Citibank, N.A., as administrative agent (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed March 6, 2023)

EX-10.1 Exhibit 10.1 Execution Copy AMENDMENT NO. 3 TO CREDIT AGREEMENT AMENDMENT NO. 3 TO CREDIT AGREEMENT, dated as of February 28, 2023 (this “Amendment”), by and among ALLISON TRANSMISSION, INC., a Delaware corporation (the “Borrower”), ALLISON TRANSMISSION HOLDINGS, INC., a Delaware corporation (“Holdings”) and CITIBANK, N.A., as Administrative Agent (in such capacity, the “Administrative Age

February 16, 2023 10-K

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Na

February 16, 2023 EX-21

List of Subsidiaries of Allison Transmission Holdings, Inc. (filed herewith)

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 15, 2023 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q4 2022 Earnings Release February 15th, 2023 Dave Graziosi, Chairman & CEO Fred Bohley, Senior Vice President & CFO Exhibit 99.

February 15, 2023 EX-99.1

Allison Transmission Announces Fourth Quarter and Full Year 2022 Results

Exhibit 99.1 Allison Transmission Announces Fourth Quarter and Full Year 2022 Results * Record Full Year Net Sales of $2,769 million, up 15% from 2021 * Record Full Year Diluted EPS of $5.53, up 34% from 2021 * Record Fourth Quarter Net Sales of $718 million, up 11% year over year * Fourth Quarter Diluted EPS of $1.52, up 32% year over year INDIANAPOLIS, February 15, 2023 – Allison Transmission Ho

February 15, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 15, 2023 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

February 10, 2023 SC 13G

ALSN / Allison Transmission Holdings Inc / Burgundy Asset Management Ltd. - SC 13G Passive Investment

SC 13G 1 d202937dsc13g.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Allison Transmission Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to des

February 9, 2023 SC 13G/A

ALSN / Allison Transmission Holdings Inc / FMR LLC Passive Investment

SC 13G/A 1 filing.txt SCHEDULE 13G Amendment No.10 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 9,155,723 Item 6: 0 Item 7: 10,380,715 Item

February 9, 2023 SC 13G/A

ALSN / Allison Transmission Holdings 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.: 10)* Name of issuer: Allison Transmission Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 01973R101 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Sche

November 10, 2022 SC 13G/A

ALSN / Allison Transmission Holdings Inc / FMR LLC Passive Investment

SCHEDULE 13G Amendment No.9 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 8,725,008 Item 6: 0 Item 7: 9,861,941 Item 8: 0 Item 9: 9,861,941

October 27, 2022 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC.

October 26, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

October 26, 2022 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q3 2022 Earnings Release October 26th, 2022 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

October 26, 2022 EX-99.1

Allison Transmission Announces Third Quarter 2022 Results

Exhibit 99.1 News Release Allison Transmission Announces Third Quarter 2022 Results * Net Sales of $710 million, up 25% year over year * Diluted EPS of $1.45, up 63% year over year * Record quarterly net sales of $118 million in the Outside North America On-Highway end market INDIANAPOLIS, October 26, 2022 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of co

September 12, 2022 SC 13G/A

ALSN / Allison Transmission Holdings Inc / FMR LLC Passive Investment

SCHEDULE 13G Amendment No.8 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 7,860,965 Item 6: 0 Item 7: 8,838,949 Item 8: 0 Item 9: 8,838,949

August 9, 2022 EX-99.1

Allison Transmission Announces Board Changes Names Richard Lavin as Lead Independent Director, appoints four new independent directors and announces retirement of four directors

Exhibit 99.1 Allison Transmission Announces Board Changes Names Richard Lavin as Lead Independent Director, appoints four new independent directors and announces retirement of four directors INDIANAPOLIS, August 9, 2022 ? Allison Transmission Holdings Inc. (NYSE: ALSN) today announced that its Board of Directors has taken a range of Board refreshment actions, including naming Richard P. Lavin to s

August 9, 2022 8-K

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, DC 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 5, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

August 4, 2022 EX-10.1

Sixth Amended and Restated Non-Employee Director Compensation Policy (filed herewith)

Exhibit 10.1 ALLISON TRANSMISSION HOLDINGS, INC. Sixth Amended and Restated Non-Employee Director Compensation Policy 1. General. This Sixth Amended and Restated Non-Employee Director Compensation Policy (the ?Policy?) as set forth herein, amends and restates that certain Third Amended and Restated Non-Employee Director Compensation Policy, previously adopted by the Compensation Committee of the B

August 4, 2022 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exac

August 3, 2022 EX-99.1

Allison Transmission Announces Second Quarter 2022 Results

Exhibit 99.1 Allison Transmission Announces Second Quarter 2022 Results * Net Sales of $664 million, up 10% year over year (up 13% year to date) * Diluted EPS of $1.26, up 25% year over year (up 24% year to date) * Record net sales for the first half of the year in the Outside North America On-Highway end market INDIANAPOLIS, August 3, 2022 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a lead

August 3, 2022 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q2 2022 Earnings Release August 3rd, 2022 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

August 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 3, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

July 26, 2022 8-K

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, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 20, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

July 19, 2022 EX-10.1

Allison Transmission, Inc. Executive Change in Control and Severance Plan (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed July 19, 2022)

Exhibit 10.1 ALLISON TRANSMISSION, INC. EXECUTIVE CHANGE IN CONTROL & SEVERANCE PLAN The Allison Transmission, Inc. Executive Change in Control & Severance Plan, as it may be amended from time to time (the ?Plan?), was adopted by the Compensation Committee of the Board of Directors of Allison Transmission Holdings, Inc., a Delaware corporation, to be effective as of July 13, 2022 (the ?Effective D

July 19, 2022 8-K

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, DC 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 13, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

May 31, 2022 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2021

Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2021 This Conflict Minerals Report for the year ended December 31, 2021 is presented to comply with Rule 13p-1 (?Rule 13p-1?) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (?SEC?) to implement reporting and disclosure re

May 31, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorpor

SD 1 d337723dsd.htm SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 001-35456 (Commission File Number) 26-0414014 (IRS Employer Identification No.) One Allison Way, Indianapolis, Indiana 4

May 10, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 4, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

April 28, 2022 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exa

April 27, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

April 27, 2022 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q1 2022 Earnings Release April 27th, 2022 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

April 27, 2022 EX-99.1

Allison Transmission Announces First Quarter 2022 Results

Exhibit 99.1 Allison Transmission Announces First Quarter 2022 Results * Net Sales of $677 million, up 15% year over year * Diluted EPS of $1.30, up 21% year over year * Record quarterly net sales in the Outside North America On-Highway end market * Company affirms full year 2022 guidance INDIANAPOLIS, April 27, 2022 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufac

March 25, 2022 DEF 14A

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

DEF 14A 1 ny20001739x1def14a.htm DEF 14A TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  ☐ Confidential,

March 25, 2022 DEFA14A

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. )

DEFA14A 1 ny20001739x2defa14a.htm DEFA14A 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

February 24, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 24, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

February 24, 2022 EX-99.1

Allison Transmission Announces an 11 Percent Increase to the Quarterly Dividend, a $1 Billion Increase to the Stock Repurchase Authorization and the Annual Stockholders Meeting and Record Date

Exhibit 99.1 Allison Transmission Announces an 11 Percent Increase to the Quarterly Dividend, a $1 Billion Increase to the Stock Repurchase Authorization and the Annual Stockholders Meeting and Record Date INDIANAPOLIS, February 25, 2022 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of conventional and electrified vehicle propulsion solutions and the larges

February 17, 2022 10-K

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? 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 No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Na

February 17, 2022 EX-21.1

List of Subsidiaries of Allison Transmission Holdings, Inc. (filed herewith)

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 16, 2022 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q4 2021 Earnings Release February 16th, 2022 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

February 16, 2022 EX-99.1

Allison Transmission Announces Fourth Quarter and Full Year 2021 Results

Exhibit 99.1 Allison Transmission Announces Fourth Quarter and Full Year 2021 Results * Fourth Quarter Net Sales of $644 million, up 20% year over year * Fourth Quarter Net Income of $118 million, up 97% year over year * Fourth Quarter Diluted EPS of $1.15, up 117% year over year * Full Year Net Sales of $2,402 million, up 15% * Full Year Net Income of $442 million, up 48% * Full Year Diluted EPS

February 16, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 16, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

February 14, 2022 SC 13G

ALSN / Allison Transmission Holdings Inc / Burgundy Asset Management Ltd. - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Allison Transmission Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 14, 2022 SC 13G/A

ALSN / Allison Transmission Holdings Inc / Boston Partners - ROBECO INVESTMENT MANAGEMENT INC. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* ALLISON TRANSMISSION HOLDINGS INC (Name of Issuer) Common stock (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

February 10, 2022 SC 13G/A

ALSN / Allison Transmission Holdings Inc / RENAISSANCE TECHNOLOGIES LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* ALLISON TRANSMISSION HOLDINGS, INC. - (Name of Issuer) Common stock, $0.01 par value - (Title of Class of Securities) 01973R101 - (CUSIP Number) December 31, 2021 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to desi

February 9, 2022 SC 13G/A

ALSN / Allison Transmission Holdings 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.: 9)* Name of issuer: Allison Transmission Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 01973R101 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Sched

February 9, 2022 SC 13G/A

ALSN / Allison Transmission Holdings Inc / FMR LLC Passive Investment

SCHEDULE 13G Amendment No. 7 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 171,943 Item 6: 0 Item 7: 15,638,913 Item 8: 0 Item 9: 15,638,913

January 27, 2022 EX-10.1

Separation Agreement, between Allison Transmission, Inc. and Michael A. Dick, dated as of January 26, 2022 (incorporated by reference to Exhibit 10.1 to the Registration’s Current Report on Form 8-K filed January 27, 2022)

Exhibit 10.1 AGREEMENT This voluntary agreement concerning my separation of employment from Allison Transmission, Inc., and related releases and covenants (?Agreement?) is entered into between Allison Transmission, Inc. (?Allison?) and Michael A. Dick (?I? ?me? or ?my?), wherein the parties agree as follows: 1. Definition. Throughout this Agreement, the term ?Allison? used alone, shall encompass t

January 27, 2022 8-K

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, DC 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, 2022 ALLISON TRANSMISSION HOLDINGS, INC.

January 27, 2022 EX-99.1

Allison Transmission Senior Vice President, Operations & Purchasing, Michael Dick to Retire March 11, 2022

Exhibit 99.1 Allison Transmission Senior Vice President, Operations & Purchasing, Michael Dick to Retire March 11, 2022 INDIANAPOLIS, January 27, 2022 ? Michael Dick, Senior Vice President, Operations & Purchasing of Allison Transmission Holdings, Inc. (NYSE: ALSN) has announced his retirement effective March 11, 2022. Rafael Basso, Vice President, Operations Planning and Business Development and

October 28, 2021 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC.

October 27, 2021 EX-99.1

Allison Transmission Announces Third Quarter 2021 Results

Exhibit 99.1 News Release Allison Transmission Announces Third Quarter 2021 Results ? Net Sales of $567 million, up 7% year-over-year ? Diluted EPS of $0.89, up 31% year-over-year ? Net Income of $94 million, 17% of Net Sales ? Adjusted EBITDA of $189 million, 33% of Net Sales ? Allison hosted a Virtual Technology Day on October 6 INDIANAPOLIS, October 27, 2021 ? Allison Transmission Holdings Inc.

October 27, 2021 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q3 2021 Earnings Release October 27th, 2021 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

October 27, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

September 22, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 21, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

September 22, 2021 EX-99.1

Jing-Jin Electric and Allison Transmission Partner to Accelerate Development of Commercial Vehicle Electrified Powertrain Solutions for Global Markets

Exhibit 99.1 Jing-Jin Electric and Allison Transmission Partner to Accelerate Development of Commercial Vehicle Electrified Powertrain Solutions for Global Markets INDIANAPOLIS, September 21, 2021 ? Allison Transmission, a leading designer and manufacturer of conventional, electric hybrid and fully electric vehicle propulsion solutions, and Jing-Jin Electric (JJE), a Chinese electrified propulsion

September 16, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 16, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

September 16, 2021 EX-99.1

Allison Transmission Signs Agreement to Acquire India-Based AVTEC’s Off-Highway Transmission Portfolio and Off-Highway Component Machining Business

Exhibit 99.1 Allison Transmission Signs Agreement to Acquire India-Based AVTEC?s Off-Highway Transmission Portfolio and Off-Highway Component Machining Business INDIANAPOLIS, September 16, 2021 ? Allison Transmission, a leading designer and manufacturer of conventional and electrified vehicle propulsion solutions and the largest global manufacturer of medium- and heavy-duty fully automatic transmi

July 29, 2021 10-Q

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

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exac

July 28, 2021 EX-99.1

Allison Transmission Announces Second Quarter 2021 Results

Exhibit 99.1 Allison Transmission Announces Second Quarter 2021 Results ? Net Sales of $603 million, up 60% year-over-year ? Net Income of $110 million, 18% of Net Sales, up over 375% year-over-year ? Adjusted EBITDA of $213 million, 35% of Net Sales ? Diluted EPS of $1.01 INDIANAPOLIS, July 28, 2021 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a leading designer and manufacturer of conventi

July 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

July 28, 2021 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q2 2021 Earnings Release July 28, 2021 Dave Graziosi, Chairman & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

May 28, 2021 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2020

EX-1.01 2 d133158dex101.htm EX-1.01 Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2020 This Conflict Minerals Report for the year ended December 31, 2020 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to i

May 28, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) One Allison Way, Indianapolis, Indiana 46222 (Address of princi

May 27, 2021 EX-10.1

Separation Agreement, between Allison Transmission, Inc. and Randall R. Kirk, dated as of May 26, 2021 (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed May 27, 2021)

Exhibit 10.1 AGREEMENT This voluntary agreement concerning my separation of employment from Allison Transmission, Inc., and related releases and covenants (?Agreement?) is entered into between Allison Transmission, Inc. (?Allison?) and Randall R. Kirk (?I? ?me? or ?my?), wherein the parties agree as follows: 1. Definition. Throughout this Agreement, the term ?Allison? used alone, shall encompass t

May 27, 2021 EX-99.1

Allison Transmission Senior Vice President, Product Engineering & Planning, Randall R. Kirk to Retire August 6, 2021

Exhibit 99.1 Allison Transmission Senior Vice President, Product Engineering & Planning, Randall R. Kirk to Retire August 6, 2021 INDIANAPOLIS, May 24, 2021 ? Randall R. Kirk, Senior Vice President, Product Engineering & Planning of Allison Transmission Holdings, Inc. (NYSE: ALSN) has announced his retirement effective August 6, 2021. ?Randy has been instrumental in leading innovation in many area

May 27, 2021 8-K

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, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 24, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

May 7, 2021 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 5, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

April 29, 2021 10-Q

Quarterly Report - ALSN-10Q-20210331

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exa

April 28, 2021 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q1 2021 Earnings Release April 28, 2021 David Graziosi, President & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

April 28, 2021 EX-99.1

Allison Transmission Announces First Quarter 2021 Results

Exhibit 99.1 News Release Allison Transmission Announces First Quarter 2021 Results ? Net Sales of $588 million ? Net Income of $120 million, 20% of Net Sales ? Adjusted EBITDA of $222 million, 38% of Net Sales ? Diluted EPS of $1.07 ? Company raises full year 2021 net sales guidance to $2,325 to $2,475 million INDIANAPOLIS, April 28, 2021 ? Allison Transmission Holdings Inc. (NYSE: ALSN), a leadi

April 28, 2021 8-K

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, 2021 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Com

March 26, 2021 DEF 14A

- DEF 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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 ?? Confidential, for Use of the Commission Only (as perm

March 26, 2021 DEFA14A

- DEFA14A

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)) ? Defin

February 18, 2021 10-K

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exact Na

February 18, 2021 EX-21.1

List of Subsidiaries of Allison Transmission Holdings, Inc. (filed herewith)

Exhibit 21.1 List of Subsidiaries Name State or Country of Organization Allison Transmission, Inc. Delaware

February 17, 2021 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

Q4 2020 Earnings Release Published February 17, 2021 (Earnings Conference Call February 18, 2021) David Graziosi, President & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.

February 17, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 17, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

February 17, 2021 EX-99.1

Allison Transmission Announces Fourth Quarter and Full Year 2020 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Fourth Quarter and Full Year 2020 Results * Fourth Quarter 2020: Net Sales $535 million, Net Income $60 million, Diluted EPS $0.53, Adjusted EBITDA $186 million, Net Cash Provided by Operating Activities $163 million, Adjusted Free Cash Flow $128 million * Full Year 2020: Net Sales $2,081 million, Net Income $299 million, Diluted EPS $2.62, Adjus

February 16, 2021 8-K

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, DC 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 11, 2021 ALLISON TRANSMISSION HOLDINGS, INC.

February 16, 2021 EX-99.1

Lawrence E. Dewey to Retire as Allison Transmission Chairman of the Board and named Chairman Emeritus; David S. Graziosi to Become Chairman of the Board following 2021 Annual Meeting

Exhibit 99.1 Lawrence E. Dewey to Retire as Allison Transmission Chairman of the Board and named Chairman Emeritus; David S. Graziosi to Become Chairman of the Board following 2021 Annual Meeting INDIANAPOLIS, Feb. 16, 2021 ? Allison Transmission Holdings Inc. (NYSE: ALSN) announced today that Lawrence E. Dewey has notified the company?s board of directors of his decision to not stand for re-elect

February 12, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Allison Transmission Holdings Inc. (Name of Issuer) (Title of Class of Securities) (CUSIP Number) Decembe

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Allison Transmission Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 11, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 0)* ALLISON TRANSMISSION HOLDINGS INC (Name of Issuer) Common stock (Title of Class of Securities) 01973R101

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 0)* ALLISON TRANSMISSION HOLDINGS INC (Name of Issuer) Common stock (Title of Class of Securities) 01973R101 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Allison Transmission Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 01973R101 Date of Event Which Requires Filing of this Statement: January 29, 2021 Check the appropriate box to designate the rule pursuant to which this Schedu

February 10, 2021 SC 13G

SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ALLISON TRANSMISSION HOLDINGS, INC. - (Name of Issuer) Common stock, $0.01 par value - (Title of Class of Securities) 01973R101 - (CUSIP Number) May 12, 2020 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Allison Transmission Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 01973R101 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Sched

February 8, 2021 SC 13G/A

SC 13G/A

SCHEDULE 13G Amendment No. 6 ALLISON TRANSMISSION HLDGS INC COMMON STOCK Cusip #01973R101 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 #01973R101 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 138,107 Item 6: 0 Item 7: 15,674,003 Item 8: 0 Item 9: 15,674,003

November 19, 2020 EX-4.1

Indenture, dated as of November 19, 2020, between the Issuer and Wilmington Trust, National Association, as Trustee (including form of 3.75% Senior Notes due 2031) (incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed November 19, 2020)

Exhibit 4.1 ALLISON TRANSMISSION, INC. as Issuer INDENTURE Dated as of November 19, 2020 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee TABLE OF CONTENTS Page ARTICLE I Definitions and Incorporation by Reference SECTION 1.1. Definitions. 1 SECTION 1.2. Other Definitions. 36 SECTION 1.3. Rules of Construction. Unless the context otherwise requires: 38 ARTICLE II The Notes SECTION 2.1. Form and

November 19, 2020 EX-99.1

Allison Transmission Closes Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes Due 2031

Exhibit 99.1 Allison Transmission Closes Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes Due 2031 INDIANAPOLIS, November 19, 2020 ? Allison Transmission Holdings, Inc. (NYSE: ALSN) (?Allison? or the ?Company?) today announced that its wholly owned subsidiary, Allison Transmission, Inc. (the ?Issuer?), completed its previously announced offering of $1 billion in aggregate p

November 19, 2020 EX-10.1

Amendment No. 2 dated as of November 19, 2020, by and among Allison Transmission Holdings, Inc., Allison Transmission, Inc., as Borrower, the several banks and other financial institutions party thereto, as 2020 Revolving Credit Lenders and Citibank, N.A., as Administrative Agent amending the Second Amended and Restated Credit Agreement, dated as of March 29, 2019, among Allison Transmission Holdings, Inc., Allison Transmission, Inc., the several banks and other financial institutions or entities from time to time parties thereto as lenders, Citibank, N.A., as Administrative Agent and Citicorp North America, Inc., as Collateral Agent (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed November 19, 2020)

Exhibit 10.1 AMENDMENT NO. 2 TO CREDIT AGREEMENT AMENDMENT NO. 2 TO CREDIT AGREEMENT, dated as of November 19, 2020 (this ?Amendment?), by and among ALLISON TRANSMISSION, INC., a Delaware corporation (the ?Borrower?), ALLISON TRANSMISSION HOLDINGS, INC., a Delaware corporation (?Holdings?), CITIBANK, N.A., as Administrative Agent (in such capacity, the ?Administrative Agent?) and the 2020 Revolvin

November 19, 2020 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2020 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (

November 10, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

November 10, 2020 EX-99.1

Allison Transmission Prices Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes due 2031

EX-99.1 Exhibit 99.1 Allison Transmission Prices Offering of $1 Billion Aggregate Principal Amount of 3.750% Senior Notes due 2031 INDIANAPOLIS, November 10, 2020 – Allison Transmission Holdings, Inc. (NYSE: ALSN) (“Allison” or the “Company”) today announced that its wholly owned subsidiary, Allison Transmission, Inc. (the “Issuer”), priced its offering of $1 billion in aggregate principal amount

November 9, 2020 EX-99.1

Allison Transmission Announces $1 Billion Senior Notes Offering

EX-99.1 2 d85893dex991.htm EX-99.1 Exhibit 99.1 Allison Transmission Announces $1 Billion Senior Notes Offering INDIANAPOLIS, November 9, 2020 – Allison Transmission Holdings, Inc. (NYSE: ALSN) (“Allison” or the “Company”) today announced that its wholly owned subsidiary, Allison Transmission, Inc. (the “Issuer”), commenced an offering of $1 billion in aggregate principal amount of senior unsecure

November 9, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

October 29, 2020 10-Q

Quarterly Report - ALSN-10Q-20200930

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC.

October 28, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

October 28, 2020 EX-99.1

Allison Transmission Announces Third Quarter 2020 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Third Quarter 2020 Results * Net Sales of $532 million, up 41% from the second quarter of 2020 * Net Income of $77 million * Diluted EPS of $0.68 * Adjusted EBITDA of $174 million INDIANAPOLIS, October 28, 2020 – Allison Transmission Holdings Inc. (NYSE: ALSN), the largest global manufacturer of medium- and heavy-duty fully automatic transmission

October 28, 2020 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 Q3 2020 Earnings Release Published October 28, 2020 (Earnings Conference Call October 29, 2020) Dave Graziosi, President & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation R

August 5, 2020 10-Q

Quarterly Report - ALSN-10Q-20200630

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exac

August 4, 2020 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 3 d37811dex992.htm EX-99.2 Q2 2020 Earnings Release Published August 4, 2020 Dave Graziosi, President & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995).

August 4, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 4, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

August 4, 2020 EX-99.1

Allison Transmission Announces Second Quarter 2020 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces Second Quarter 2020 Results • Net Income of $23 million • Diluted EPS of $0.20 • Adjusted EBITDA of $115 million • Net Cash Provided by Operating Activities of $92 million • Adjusted Free Cash Flow of $67 million INDIANAPOLIS, August 4, 2020 – Allison Transmission Holdings Inc. (NYSE: ALSN), the largest global manufacturer of medium- and heavy-du

May 29, 2020 EX-1.01

Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2019

EX-1.01 Exhibit 1.01 Allison Transmission Holdings, Inc. Conflict Minerals Report For the Year Ended December 31, 2019 This Conflict Minerals Report for the year ended December 31, 2019 is presented to comply with Rule 13p-1 (“Rule 13p-1”) under the Securities Exchange Act of 1934, as amended. Rule 13p-1 was adopted by the Securities and Exchange Commission (“SEC”) to implement reporting and discl

May 29, 2020 SD

- FORM SD

Form SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) One Allison Way, Indianapolis, Indiana 46222 (Address o

May 11, 2020 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 6, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

May 11, 2020 EX-3.1

Sixth Amended and Restated Bylaws of Allison Transmission Holdings, Inc. (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed May 11, 2020)

EX-3.1 Exhibit 3.1 ALLISON TRANSMISSION HOLDINGS, INC. SIXTH AMENDED AND RESTATED BYLAWS As Adopted on May 7, 2020 TABLE OF CONTENTS Page ARTICLE I MEETINGS OF STOCKHOLDERS 1 Section 1.01 Annual Meetings 1 Section 1.02 Special Meetings 1 Section 1.03 Participation in Meetings by Remote Communication 1 Section 1.04 Notice of Meetings; Waiver of Notice. 1 Section 1.05 Proxies. 2 Section 1.06 Voting

May 5, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File No. 001-35456 ALLISON TRANSMISSION HOLDINGS, INC. (Exa

May 4, 2020 EX-99.2

Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect,” “anticipate,” “intend,” “est

EX-99.2 Q1 2020 Earnings Release Published May 4, 2020 David Graziosi, President & Chief Executive Officer Fred Bohley, Senior Vice President & Chief Financial Officer Exhibit 99.2 Safe Harbor Statement The following information contains, or may be deemed to contain, “forward-looking statements” (as defined in the U.S. Private Securities Litigation Reform Act of 1995). The words “believe,” “expect

May 4, 2020 EX-99.1

Allison Transmission Announces First Quarter 2020 Results

EX-99.1 Exhibit 99.1 Allison Transmission Announces First Quarter 2020 Results • Net Sales of $637 million • Net Income of $139 million, 22% of Net Sales • Adjusted EBITDA of $257 million, 40% of Net Sales • Diluted EPS of $1.20 • As of March 31, 2020, the company had $114 million of cash and cash equivalents and $595 million of available revolving credit facility commitments INDIANAPOLIS, May 4,

May 4, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 4, 2020 ALLISON TRANSMISSION HOLDINGS, INC.

April 24, 2020 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

April 21, 2020 DEFA14A

ALSN / Allison Transmission Holdings, Inc. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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 ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

April 9, 2020 SC 13G/A

ALSN / Allison Transmission Holdings, Inc. / BlackRock Inc. Passive Investment

us01973r1014040920.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 1) ALLISON TRANSMISSION HOLDINGS INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 01973R101 - (CUSIP Number) March 31, 2020 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

March 27, 2020 DEF 14A

ALSN / Allison Transmission Holdings, Inc. DEF 14A - - DEF 14A

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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  o Check the appropriate box:  o Preliminary Proxy Statement  o Confidential, for Use of the Commission Only (as permi

March 27, 2020 8-K

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): March 27, 2020 ALLISON TRANSMISSION HOLDINGS, INC. (Exact name of registrant as specified in its charter) Delaware 001-35456 26-0414014 (State or other jurisdiction of incorporation)

March 27, 2020 DEFA14A

ALSN / Allison Transmission Holdings, Inc. DEFA14A - - DEFA14A

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)) ☐ Defin

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