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person · Reporting owner

BARBOUR D. SCOTT

Disclosed activity across 2 companies

Tapewire entity
269
SEC CIK
0001716232

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
ADVANCED DRAINAGE SYSTEMS, INC.WMS · Entity 2328Director · See RemarksAugust 20, 2026August 24, 2026
Allison Transmission Holdings IncALSN · Entity 246DirectorAugust 31, 2026September 02, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

ADVANCED DRAINAGE SYSTEMS, INC.

Report date August 20, 2026 · Filed August 24, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeIndirectReporting Person's Revocable Trust51,652 Reported balance After 2026-08-20 transaction · row 1 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 1 · 2026-08-20 · Gift · Disposed 2,000 · Balance 51,652

F1: Shares held in revocable trust for the benefit of the reporting person.

Common StockSEC Table I · non-derivativeDirect77,268 Reported balance Holding disclosure · report date 2026-08-20 · row 2 Holding and transaction disclosures are not merged.
1 source row

Row 2 · Balance 77,268

Common StockSEC Table I · non-derivativeIndirectReporting Person's Irrevocable Trust109,955 Reported balance Holding disclosure · report date 2026-08-20 · row 3 Holding and transaction disclosures are not merged.
1 source row

Row 3 · Balance 109,955

F2: Shares held in irrevocable spousal access trust established by the reporting person, of which the reporting person's spouse is a co-trustee. The beneficiaries of the irrevocable trust are the reporting person and his children.

Common StockSEC Table I · non-derivativeIndirectReporting Person's 2024 GRAT11,867 Reported balance Holding disclosure · report date 2026-08-20 · row 4 Holding and transaction disclosures are not merged.
1 source row

Row 4 · Balance 11,867

F3: Shares held in GRATs of which the reporting person is trustee.

Common StockSEC Table I · non-derivativeIndirectReporting Person's 2025 GRAT46,500 Reported balance Holding disclosure · report date 2026-08-20 · row 5 Holding and transaction disclosures are not merged.
1 source row

Row 5 · Balance 46,500

F3: Shares held in GRATs of which the reporting person is trustee.

Common StockSEC Table I · non-derivativeIndirectSpouse's Revocable Trust6,495 Reported balance Holding disclosure · report date 2026-08-20 · row 6 Holding and transaction disclosures are not merged.
1 source row

Row 6 · Balance 6,495

F4: Shares held in revocable trust for the benefit of the reporting person's spouse.

Common StockSEC Table I · non-derivativeIndirectSpouse's Irrevocable Trust69,005 Reported balance Holding disclosure · report date 2026-08-20 · row 7 Holding and transaction disclosures are not merged.
1 source row

Row 7 · Balance 69,005

F5: Shares held in irrevocable spousal access trust established by the reporting person's spouse, of which the reporting person is a co-trustee. The beneficiaries of the irerrevocable trust include the reporting person's spouse and his children.

Common StockSEC Table I · non-derivativeIndirectBy KSOP17,112.0923 Reported balance Holding disclosure · report date 2026-08-20 · row 8 Holding and transaction disclosures are not merged.
1 source row

Row 8 · Balance 17,112.0923

F6: Represents current allocation under KSOP.

Filing footnotes · ownership attribution and instrument terms

F1: Shares held in revocable trust for the benefit of the reporting person.

F2: Shares held in irrevocable spousal access trust established by the reporting person, of which the reporting person's spouse is a co-trustee. The beneficiaries of the irrevocable trust are the reporting person and his children.

F3: Shares held in GRATs of which the reporting person is trustee.

F4: Shares held in revocable trust for the benefit of the reporting person's spouse.

F5: Shares held in irrevocable spousal access trust established by the reporting person's spouse, of which the reporting person is a co-trustee. The beneficiaries of the irerrevocable trust include the reporting person's spouse and his children.

F6: Represents current allocation under KSOP.

Allison Transmission Holdings Inc

Report date August 31, 2026 · Filed September 02, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Dividend Equivalent RightsSEC Table II · derivative / convertible securityDirect6 Reported balance After 2026-08-31 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2026-08-31 · Grant · Acquired 3 · Balance 6

F1: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Filing footnotes · ownership attribution and instrument terms

F1: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
August 31, 2026 Filed Sep 2, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 3 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-380145 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6

Underlying: Common Stock · 3 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Read SEC document
August 20, 2026 Filed Aug 24, 2026 20:10 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 2,000 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-363586 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Revocable Trust

Disclosed balance after: 51,652

F1 · ownership.nature: Shares held in revocable trust for the benefit of the reporting person.

Read SEC document
June 12, 2026 Filed Jun 17, 2026 21:35 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 OtherCommon Stock 511 $135.72 $69,352.92
Disclosure

SEC source: 0001193125-26-274420 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Revocable Trust

Disclosed balance after: 53,652

F1 · kind: On June 12, 2026, the reporting person withdrew 511 shares of ADS common stock from a grantor retained annuity irrevocable remainder trust and transferred the 511 shares of ADS common stock to his revocable trust for the benefit of the reporting person. In exchange for the shares, the reporting person contributed cash to the trust in the principal amount of $69,352.92. The reporting person was the beneficial owner of the transferred securities both before and after the transfer and the reporting person believes the transfer was exempt by Rule 16a-13 under the Securities Exchange Act of 1934.

F3 · ownership.nature: Shares held in revocable trust for the benefit of the reporting person.

Read SEC document
June 12, 2026 Filed Jun 17, 2026 21:35 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 OtherCommon Stock 511 $135.72 $69,352.92
Disclosure

SEC source: 0001193125-26-274420 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · 2023 GRAT Remainder Trust

Disclosed balance after: 0

F1 · kind: On June 12, 2026, the reporting person withdrew 511 shares of ADS common stock from a grantor retained annuity irrevocable remainder trust and transferred the 511 shares of ADS common stock to his revocable trust for the benefit of the reporting person. In exchange for the shares, the reporting person contributed cash to the trust in the principal amount of $69,352.92. The reporting person was the beneficial owner of the transferred securities both before and after the transfer and the reporting person believes the transfer was exempt by Rule 16a-13 under the Securities Exchange Act of 1934.

F2 · ownership.nature: Shares held in irrevocable remainder trust, of which the reporting person's spouse is trustee. The beneficiaries of the irrevocable trust are the reporting persons's nieces and nephew.

Read SEC document
May 29, 2026 Filed Jun 2, 2026 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 3 $0.00 $0.00
Disclosure

SEC source: 0001716232-26-000003 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3

Underlying: Common Stock · 3 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Read SEC document
May 26, 2026 Filed May 28, 2026 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantOption to Purchase Common Stock · Derivative 20,124 $0.00 Strike: $138.09 $0.00
Disclosure

SEC source: 0001193125-26-245187 · ownership.xml · derivative · entry 10

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,124

Underlying: Common Stock · 20,124 shares

Expires 2036-05-27

F8 · derivative.exercise_date: The options vest in three equal annual installments beginning on May 26, 2027, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date.

Read SEC document
May 26, 2026 Filed May 28, 2026 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantCommon Stock 9,036 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-245187 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,268

Read SEC document
May 22, 2026 Filed May 27, 2026 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 1,898 $133.00 $252,434.00
Disclosure

SEC source: 0001193125-26-241876 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 68,232

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

Read SEC document
May 20, 2026 Filed May 21, 2026 22:23 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantCommon Stock 29,327 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-235024 · ownership.xml · nonDerivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,130

F2 · shares: Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals for the performance period ended March 31, 2026 had been met. Total includes dividend equivalents in the amount of 409 shares, which dividend equivalents are settled in common stock.

Read SEC document
May 20, 2026 Filed May 21, 2026 22:23 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 1,130 $136.83 $154,617.90
Disclosure

SEC source: 0001193125-26-235024 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,803

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

Read SEC document
May 19, 2026 Filed May 21, 2026 22:23 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 934 $131.59 $122,905.06
Disclosure

SEC source: 0001193125-26-235024 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,933

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

Read SEC document
May 07, 2026 Filed May 8, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantRestricted Stock Units · Derivative 1,503 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-214564 · ownership.xml · derivative · entry 5

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,503

Underlying: Common Stock · 1,503 shares

Expires not disclosed

F9 · security: The RSUs represent the reporting person's annual equity award under the Company's Ninth Amended and Restated Non-Employee Director Compensation Policy.

F5 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock.

F11 · price: The number of RSUs received was calculated based on $123.02, which was the closing price of the Company's common stock on the date of grant.

F10 · derivative.exercise_date: The RSUs vest on the date of the next annual meeting of the stockholders of the Company. Unvested RSUs earn dividend equivalents when dividends are declared on the Company's common stock.

F10 · derivative.expiration_date: The RSUs vest on the date of the next annual meeting of the stockholders of the Company. Unvested RSUs earn dividend equivalents when dividends are declared on the Company's common stock.

Read SEC document
May 06, 2026 Filed May 8, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionDividend Equivalent Rights · Derivative 16 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-214564 · ownership.xml · derivative · entry 4

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 16 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F8 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded RSUs and vested on May 6, 2026.

F8 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded RSUs and vested on May 6, 2026.

Read SEC document
May 06, 2026 Filed May 8, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionRestricted Stock Units · Derivative 1,570 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-214564 · ownership.xml · derivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,570 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock.

F6 · derivative.exercise_date: On May 8, 2025, the reporting person was granted 1,570 RSUs that vested on May 6, 2026.

F6 · derivative.expiration_date: On May 8, 2025, the reporting person was granted 1,570 RSUs that vested on May 6, 2026.

Read SEC document
May 06, 2026 Filed May 8, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionCommon Stock 1,586 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-214564 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,281

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Settlement of restricted stock units ("RSUs") and related dividend equivalents.

F4 · shares: Includes 16 dividend equivalents.

Read SEC document
May 06, 2026 Filed May 8, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantCommon Stock 92 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-214564 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,695

F1 · security: These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion.

F2 · shares: The number of shares of common stock received was calculated based on $127.70 which was the closing price of the Company's common stock on the date of grant.

Read SEC document
March 20, 2026 Filed Mar 24, 2026 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 4 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-121746 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Read SEC document
March 13, 2026 Filed Mar 17, 2026 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 7,150 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-110740 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Irrevocable Trust

Disclosed balance after: 109,955

F2 · ownership.nature: Shares held in irrevocable spousal access trust established by the reporting person, of which the reporting person's spouse is a co-trustee. The beneficiaries of the irrevocable trust are the reporting person and his children.

Read SEC document
March 13, 2026 Filed Mar 17, 2026 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 7,150 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-110740 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Revocable Trust

Disclosed balance after: 53,141

F1 · ownership.nature: Shares held in revocable trust for the benefit of the reporting person.

Read SEC document
March 04, 2026 Filed Mar 6, 2026 22:46 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 511 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-097013 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · 2023 GRAT Remainder Trust

Disclosed balance after: 511

F3 · ownership.nature: Shares held in irrevocable remainder trust, of which the reporting person's spouse is trustee. The beneficiaries of the irrevocable trust are the reporting persons's nieces and nephew.

Read SEC document
March 04, 2026 Filed Mar 6, 2026 22:46 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 511 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-097013 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's 2023 GRAT

Disclosed balance after: 0

F1 · balance_after: On December 17, 2025, the reporting person transferred 24,600 shares of common stock of Advanced Drainage Systems, Inc. from his 2023 GRAT to his revocable trust for the benefit of the reporting person, which transfer is exempt under Rule 16a-13.

F2 · ownership.nature: Shares held in GRATs of which the reporting person is trustee.

Read SEC document
February 06, 2026 Filed Feb 10, 2026 21:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantCommon Stock 102 $0.00 $0.00
Disclosure

SEC source: 0001193125-26-044636 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,603

F1 · security: These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion.

F2 · shares: The number of shares of common stock received was calculated based on $115.63, which was the closing price of the Company's common stock on the date of grant.

Read SEC document
December 05, 2025 Filed Dec 9, 2025 21:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 4 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-312718 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 46,500 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-300493 · ownership.xml · nonDerivative · entry 5

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's 2025 GRAT

Disclosed balance after: 46,500

F1 · ownership.nature: Shares held in GRATs of which the reporting person is trustee.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 46,500 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-300493 · ownership.xml · nonDerivative · entry 4

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Revocable Trust

Disclosed balance after: 37,491

F2 · ownership.nature: Shares held in revocable trust for the benefit of the reporting person.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 14,500 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-300493 · ownership.xml · nonDerivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's Revocable Trust

Disclosed balance after: 83,991

F2 · ownership.nature: Shares held in revocable trust for the benefit of the reporting person.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 14,500 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-300493 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · Reporting Person's 2024 GRAT

Disclosed balance after: 11,867

F1 · ownership.nature: Shares held in GRATs of which the reporting person is trustee.

Read SEC document
November 25, 2025 Filed Nov 26, 2025 21:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GiftCommon Stock 1,800 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-300493 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,067

Read SEC document
November 12, 2025 Filed Nov 13, 2025 21:50 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Exercise / conversionOption to Purchase Common Stock · Derivative 80,030 $0.00 Strike: $25.75 $0.00
Disclosure

SEC source: 0001193125-25-280373 · ownership.xml · derivative · entry 12

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 80,030 shares

Expires 2028-05-23

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · derivative.exercise_date: The options vested in three equal annual installments beginning on May 23, 2019.

Read SEC document
November 12, 2025 Filed Nov 13, 2025 21:50 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 SaleCommon Stock 2,030 $150.66 $305,829.85
Disclosure

SEC source: 0001193125-25-280373 · ownership.xml · nonDerivative · entry 4

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,867

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $150.61 to $151.6099, inclusive. The reporting person undertakes to provide to Advanced Drainage Systems, Inc., any security holder of Advanced Drainage Systems, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (3) to this Form 4.

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November 12, 2025 Filed Nov 13, 2025 21:50 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 SaleCommon Stock 73,462 $148.96 $10,942,877.48
Disclosure

SEC source: 0001193125-25-280373 · ownership.xml · nonDerivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,897

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $149.54 to $150.5399, inclusive. The reporting person undertakes to provide to Advanced Drainage Systems, Inc., any security holder of Advanced Drainage Systems, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (2) to this Form 4.

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November 12, 2025 Filed Nov 13, 2025 21:50 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 SaleCommon Stock 4,538 $148.01 $671,655.77
Disclosure

SEC source: 0001193125-25-280373 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,359

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $148.00 to $148.9999, inclusive. The reporting person undertakes to provide to Advanced Drainage Systems, Inc., any security holder of Advanced Drainage Systems, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4.

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November 12, 2025 Filed Nov 13, 2025 21:50 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Exercise / conversionCommon Stock 80,030 $25.75 $2,060,772.50
Disclosure

SEC source: 0001193125-25-280373 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,897

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

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November 07, 2025 Filed Nov 12, 2025 21:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantCommon Stock 144 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-277467 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,501

F1 · security: These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion.

F2 · shares: The number of shares of common stock received was calculated based on $81.95, which was the closing price of the Company's common stock on the date of grant.

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August 29, 2025 Filed Sep 3, 2025 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 4 $0.00 $0.00
Disclosure

SEC source: 0001716232-25-000003 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

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August 07, 2025 Filed Aug 11, 2025 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantCommon Stock 135 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-106522 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,357

F1 · security: These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion.

F2 · shares: The number of shares of common stock received was calculated based on $87.41, which was the closing price of the Company's common stock on the date of grant.

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May 30, 2025 Filed Jun 3, 2025 20:00 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantDividend Equivalent Rights · Derivative 4 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-080880 · ownership.xml · derivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded restricted stock units ("RSUs") and vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Allison Transmission Holdings, Inc. common stock.

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May 22, 2025 Filed May 23, 2025 20:28 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 1,930 $111.00 $214,230.00
Disclosure

SEC source: 0000950170-25-076988 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,867

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

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May 20, 2025 Filed May 21, 2025 22:30 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 1,149 $118.39 $136,030.11
Disclosure

SEC source: 0000950170-25-075930 · ownership.xml · nonDerivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,797

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

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May 19, 2025 Filed May 21, 2025 22:30 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantOption to Purchase Common Stock · Derivative 20,165 $0.00 Strike: $119.30 $0.00
Disclosure

SEC source: 0000950170-25-075930 · ownership.xml · derivative · entry 11

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,165

Underlying: Common Stock · 20,165 shares

Expires 2035-05-20

F8 · derivative.exercise_date: The options vest in three equal annual installments beginning on May 19, 2026, provided that the Reporting Person remains continuously employed by the Issuer through each applicable vesting date.

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May 19, 2025 Filed May 21, 2025 22:30 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 1,599 $121.86 $194,854.14
Disclosure

SEC source: 0000950170-25-075930 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,946

F1 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

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May 19, 2025 Filed May 21, 2025 22:30 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantCommon Stock 9,457 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-075930 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,545

Read SEC document
May 14, 2025 Filed May 16, 2025 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 201 $121.68 $24,457.68
Disclosure

SEC source: 0000950170-25-073528 · ownership.xml · nonDerivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,088

F2 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

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May 14, 2025 Filed May 16, 2025 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 Tax withholdingCommon Stock 12,867 $121.68 $1,565,656.56
Disclosure

SEC source: 0000950170-25-073528 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,289

F2 · shares: Represents shares withheld to satisfy Reporting Person's tax obligations in connection with the vesting of shares of restricted common stock of the Issuer.

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May 14, 2025 Filed May 16, 2025 20:05 UTC ADVANCED DRAINAGE SYSTEMS, INC. WMS · Entity 2328 GrantCommon Stock 31,529 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-073528 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,156

F1 · shares: Reflects grant of performance-based units, originally granted pursuant to the Issuer's 2017 Omnibus Incentive Plan, earned after the Issuer determined that certain performance goals for the performance period ended March 31, 2025 had been met. Total includes dividend equivalents in the amount of 442 shares, which dividend equivalents are settled in common stock.

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May 08, 2025 Filed May 9, 2025 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantRestricted Stock Units · Derivative 1,570 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-067997 · ownership.xml · derivative · entry 5

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,570

Underlying: Common Stock · 1,570 shares

Expires not disclosed

F9 · security: The RSUs represent the reporting person's annual equity award under the Company's Eighth Amended and Restated Non-Employee Director Compensation Policy.

F5 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock.

F11 · price: The number of RSUs received was calculated based on $98.72, which was the closing price of the Company's common stock on the date of grant.

F10 · derivative.exercise_date: The RSUs vest on the date of the next annual meeting of the stockholders of the Company. Unvested RSUs earn dividend equivalents when dividends are declared on the Company's common stock.

F10 · derivative.expiration_date: The RSUs vest on the date of the next annual meeting of the stockholders of the Company. Unvested RSUs earn dividend equivalents when dividends are declared on the Company's common stock.

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May 07, 2025 Filed May 9, 2025 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionDividend Equivalent Rights · Derivative 20 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-067997 · ownership.xml · derivative · entry 4

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F8 · derivative.exercise_date: The dividend equivalent rights accrued on previously awarded RSUs and vested on May 7, 2025.

F8 · derivative.expiration_date: The dividend equivalent rights accrued on previously awarded RSUs and vested on May 7, 2025.

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May 07, 2025 Filed May 9, 2025 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionRestricted Stock Units · Derivative 2,017 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-067997 · ownership.xml · derivative · entry 3

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,017 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock.

F6 · derivative.exercise_date: On May 9, 2024, the reporting person was granted 2,017 RSUs that vested on May 7, 2025.

F6 · derivative.expiration_date: On May 9, 2024, the reporting person was granted 2,017 RSUs that vested on May 7, 2025.

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May 07, 2025 Filed May 9, 2025 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 Exercise / conversionCommon Stock 2,037 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-067997 · ownership.xml · nonDerivative · entry 2

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,222

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Settlement of restricted stock units ("RSUs") and related dividend equivalents.

F4 · shares: Includes 20 dividend equivalents.

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May 07, 2025 Filed May 9, 2025 20:05 UTC Allison Transmission Holdings Inc ALSN · Entity 246 GrantCommon Stock 122 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-067997 · ownership.xml · nonDerivative · entry 1

BARBOUR D. SCOTT · CIK 0001716232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,185

F1 · security: These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion.

F2 · shares: The number of shares of common stock received was calculated based on $97.23, which was the closing price of the Company's common stock on the date of grant.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.