Allison Transmission Holdings Inc SEC filings ALSN
Allison Transmission Holdings Inc has 1,001 filings in SEC EDGAR's recent list, going back to Sep 2, 2020. Its latest annual report, Form ARS, was filed on Mar 25, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 2, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 4, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2026 | Nov 2, 2026 |
| 10-Q | Quarterly report | Aug 5, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2026 | Aug 3, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jun 16, 2026 | Jun 11, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 8, 2026 | May 6, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 4, 2026 | May 4, 2026 |
| ARS | Annual report to shareholders | Mar 25, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 25, 2026 | — |
| DEF 14A | Proxy statement | Mar 25, 2026 | May 6, 2026 |
| 8-K/A | Amended current report | Mar 16, 2026 | Jan 1, 2026 |
| 10-K | Annual report | Feb 24, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 23, 2026 | Feb 23, 2026 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, New debt, Officer or director change, Regulation FD disclosure
|
Jan 2, 2026 | Jan 1, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 24, 2025 | Nov 21, 2025 |
| 8-K |
Current report
Other events
|
Nov 7, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 4, 2025 | Nov 4, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 31, 2025 | Oct 30, 2025 |
| 10-Q | Quarterly report | Oct 30, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2025 | Oct 29, 2025 |
| 10-Q | Quarterly report | Aug 5, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2025 | Aug 4, 2025 |
| 8-K |
Current report
Material agreement, Other events
|
Jun 13, 2025 | Jun 11, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 11, 2025 | Jun 11, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 30, 2025 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 9, 2025 | May 7, 2025 |
| 10-Q | Quarterly report | May 2, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 1, 2025 | May 1, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Apr 10, 2025 | Apr 10, 2025 |
| DEFA14A | Additional proxy material | Apr 7, 2025 | — |
| ARS | Annual report to shareholders | Mar 26, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 26, 2025 | — |
| DEF 14A | Proxy statement | Mar 26, 2025 | May 7, 2025 |
| PRE 14A | Preliminary proxy statement | Mar 10, 2025 | May 7, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
Feb 20, 2025 | Feb 19, 2025 |
| 10-K | Annual report | Feb 13, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 11, 2025 | Feb 11, 2025 |
| 10-Q | Quarterly report | Oct 30, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2024 | Oct 29, 2024 |
| 10-Q | Quarterly report | Jul 26, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 25, 2024 | Jul 25, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jun 4, 2024 | Jun 3, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2024 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 10, 2024 | May 8, 2024 |
| 10-Q | Quarterly report | Apr 26, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
Apr 25, 2024 | Apr 25, 2024 |
| ARS | Annual report to shareholders | Mar 29, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Mar 29, 2024 | — |
| DEF 14A | Proxy statement | Mar 29, 2024 | May 8, 2024 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Mar 18, 2024 | Mar 13, 2024 |
| 10-K | Annual report | Feb 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 13, 2024 | Feb 13, 2024 |
| 10-Q | Quarterly report | Oct 26, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Oct 25, 2023 | Oct 25, 2023 |
| 10-Q | Quarterly report | Jul 28, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2023 | Jul 27, 2023 |
| SD | Specialized disclosure (conflict minerals) | May 15, 2023 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 5, 2023 | May 3, 2023 |
| 10-Q | Quarterly report | Apr 28, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2023 | Apr 27, 2023 |
| ARS | Annual report to shareholders | Mar 24, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Mar 24, 2023 | — |
| DEF 14A | Proxy statement | Mar 24, 2023 | — |
| 8-K |
Current report
Material agreement
|
Mar 6, 2023 | Feb 28, 2023 |
| 10-K | Annual report | Feb 16, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 15, 2023 | Feb 15, 2023 |
| 10-Q | Quarterly report | Oct 27, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 26, 2022 | Oct 26, 2022 |
| 8-K |
Current report
Officer or director change
|
Aug 9, 2022 | Aug 5, 2022 |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2022 | Aug 3, 2022 |
| 8-K |
Current report
Officer or director change
|
Jul 26, 2022 | Jul 20, 2022 |
| 8-K |
Current report
Officer or director change
|
Jul 19, 2022 | Jul 13, 2022 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2022 | — |
| 8-K |
Current report
Shareholder vote results
|
May 10, 2022 | May 4, 2022 |
| 10-Q | Quarterly report | Apr 28, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2022 | Apr 27, 2022 |
| DEFA14A | Additional proxy material | Mar 25, 2022 | — |
| DEF 14A | Proxy statement | Mar 25, 2022 | May 4, 2022 |
| 8-K |
Current report
Other events
|
Feb 24, 2022 | Feb 24, 2022 |
| 10-K | Annual report | Feb 17, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 16, 2022 | Feb 16, 2022 |
| 8-K |
Current report
Officer or director change
|
Jan 27, 2022 | Jan 25, 2022 |
| 10-Q | Quarterly report | Oct 28, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 27, 2021 | Oct 27, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 22, 2021 | Sep 21, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 16, 2021 | Sep 16, 2021 |
| 10-Q | Quarterly report | Jul 29, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2021 | Jul 28, 2021 |
| SD | Specialized disclosure (conflict minerals) | May 28, 2021 | — |
| 8-K |
Current report
Officer or director change
|
May 27, 2021 | May 24, 2021 |
| 8-K |
Current report
Shareholder vote results
|
May 7, 2021 | May 5, 2021 |
| 10-Q | Quarterly report | Apr 29, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2021 | Apr 28, 2021 |
| DEFA14A | Additional proxy material | Mar 26, 2021 | — |
| DEF 14A | Proxy statement | Mar 26, 2021 | May 5, 2021 |
| 10-K | Annual report | Feb 18, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 17, 2021 | Feb 17, 2021 |
| 8-K |
Current report
Officer or director change
|
Feb 16, 2021 | Feb 11, 2021 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Nov 19, 2020 | Nov 19, 2020 |
| 8-K |
Current report
Other events
|
Nov 10, 2020 | Nov 9, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 9, 2020 | Nov 9, 2020 |
| 10-Q | Quarterly report | Oct 29, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2020 | Oct 28, 2020 |
Showing 106 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Motor Vehicle Parts & Accessories (SIC 3714)
- Listed as
- ALSN (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Indianapolis, IN
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1411207
- Former names
- Allison Transmission Holdings Inc (until Nov 4, 2026)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.