Sec Form 3 Filing - Eifert Thomas @ Allison Transmission Holdings Inc - 2021-08-06

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Eifert Thomas 2. Issuer Name and Ticker or Trading Symbol Allison Transmission Holdings Inc [ ALSN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) VP, Program Mgmt & Prod Pln (Last) (First) (Middle) ONE ALLISON WAY 3. Date of Earliest Transaction (MM/DD/YY) 08/06/2021 (Street) INDIANAPOLIS, IN46222 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 1,084 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Option (right to buy) $ 30.23 ( 1 ) 02/18/2024 Common Stock 4,840 D Employee Stock Option (right to buy) $ 32.13 ( 2 ) 02/19/2025 Common Stock 2,790 D Employee Stock Option (right to buy) $ 23.59 ( 3 ) 02/16/2026 Common Stock 4,202 D Employee Stock Option (right to buy) $ 37.11 ( 4 ) 02/22/2027 Common Stock 3,741 D Employee Stock Option (right to buy) $ 43.3 ( 5 ) 02/07/2028 Common Stock 4,735 D Employee Stock Option (right to buy) $ 49.6 ( 6 ) 02/20/2029 Common Stock 4,681 D Employee Stock Option (right to buy) $ 43.24 ( 7 ) 02/25/2030 Common Stock 5,388 D Employee Stock Option (right to buy) $ 43.13 ( 8 ) 02/10/2031 Common Stock 6,690 D Restricted Stock Units ( 10 ) ( 9 ) ( 9 ) Common Stock 1,560 D Restricted Stock Units ( 10 ) ( 11 ) ( 11 ) Common Stock 1,796 D Restricted Stock Units ( 10 ) ( 12 ) ( 12 ) Common Stock 2,230 D Dividend Equivalent Rights ( 13 ) ( 13 ) ( 13 ) Common Stock 131 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Eifert Thomas ONE ALLISON WAY INDIANAPOLIS, IN46222 VP, Program Mgmt & Prod Pln Signatures Jacalyn C. Bolles, Attorney-in-Fact (power of attorney filed herewith) 08/13/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The option vested on December 1, 2016. ( 2 )The option vested on February 19, 2018. ( 3 )The option vested on February 17, 2019. ( 4 )The option vested on February 22, 2020. ( 5 )The option vested on February 7, 2021. ( 6 )The option vests on February 20, 2022. ( 7 )The option vests on February 25, 2023. ( 8 )The option vests in three equal annual installments beginning on February 10, 2022. ( 9 )The restricted stock units ("RSUs") vest on February 20, 2022. ( 10 )Each RSU represents a contingent right to receive one share of Allison Transmission Holdings, Inc. common stock ("Common Stock"). RSUs earn dividend equivalents when dividends are declared on the Common Stock. ( 11 )The RSUs vest on February 25, 2023. ( 12 )The RSUs vest in three equal annual installments beginning on February 10, 2022. ( 13 )The dividend equivlanet rights vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Common Stock.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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