Allegro Microsystems, Inc. SEC filings ALGM
Allegro Microsystems, Inc. has 529 filings in SEC EDGAR's recent list, going back to Aug 8, 2007. Its latest annual report, Form ARS, was filed on Jun 24, 2026 for the period ended Mar 27, 2026. The latest quarterly report (Form 10-Q) was filed on Oct 30, 2026, covering the quarter ended Sep 25, 2026. The most recent current report (Form 8-K) was filed on Oct 29, 2026 (results of operations). The company's fiscal year ends on March 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 7, 2026 | — |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Aug 18, 2026 | Aug 17, 2026 |
| 144 | Notice of proposed sale | Aug 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 13, 2026 | — |
| 4 | Insider transaction | Aug 12, 2026 | Aug 10, 2026 |
| 144 | Notice of proposed sale | Aug 10, 2026 | — |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 5, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 16, 2026 | — |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 3 | Initial insider ownership | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 4, 2026 | Jun 3, 2026 |
| 144 | Notice of proposed sale | Jun 3, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 22, 2026 | May 21, 2026 |
| 144 | Notice of proposed sale | May 22, 2026 | — |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 16, 2026 |
| 144 | Notice of proposed sale | May 18, 2026 | — |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 14, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 3 | Initial insider ownership | May 15, 2026 | May 13, 2026 |
| 144 | Notice of proposed sale | May 14, 2026 | — |
| 4 | Insider transaction | May 13, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 13, 2026 | May 11, 2026 |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| 144 | Notice of proposed sale | May 11, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 6, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 25, 2026 | Mar 24, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 144 | Notice of proposed sale | Mar 2, 2026 | — |
| 144 | Notice of proposed sale | Mar 2, 2026 | — |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 13, 2026 |
| 144 | Notice of proposed sale | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2026 | — |
| 3 | Initial insider ownership | Jan 9, 2026 | Jan 5, 2026 |
| 4 | Insider transaction | Dec 12, 2025 | Dec 10, 2025 |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 4 | Insider transaction | Nov 12, 2025 | Nov 11, 2025 |
| 3 | Initial insider ownership | Oct 16, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Aug 25, 2025 | Aug 22, 2025 |
| 4 | Insider transaction | Aug 13, 2025 | Aug 12, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| 144 | Notice of proposed sale | Aug 12, 2025 | — |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 8, 2025 | Aug 7, 2025 |
| 4 | Insider transaction | Aug 5, 2025 | Aug 4, 2025 |
| 144 | Notice of proposed sale | Aug 4, 2025 | — |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 144 | Notice of proposed sale | Jun 11, 2025 | — |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 144 | Notice of proposed sale | Jun 4, 2025 | — |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 15, 2025 |
| 4 | Insider transaction | May 14, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 14, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 14, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 14, 2025 | May 13, 2025 |
| 4 | Insider transaction | May 14, 2025 | May 13, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 15, 2025 | — |
| 3 | Initial insider ownership | Mar 31, 2025 | Mar 29, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 27, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| 4 | Insider transaction | Feb 3, 2025 | Jan 31, 2025 |
| 3 | Initial insider ownership | Feb 3, 2025 | Jan 31, 2025 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 18, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 18, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 8, 2024 | — |
| 4 | Insider transaction | Nov 6, 2024 | Nov 5, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 4, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 24, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 3, 2024 | — |
| 4 | Insider transaction | Sep 3, 2024 | Aug 30, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 9, 2024 | Aug 7, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 9, 2024 | — |
| 4 | Insider transaction | Aug 2, 2024 | Aug 1, 2024 |
| 4 | Insider transaction | Jul 31, 2024 | Jul 29, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2024 | — |
| 4 | Insider transaction | Jun 14, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 13, 2024 | Jun 11, 2024 |
| 144 | Notice of proposed sale | Jun 11, 2024 | — |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | May 31, 2024 | May 30, 2024 |
| 144 | Notice of proposed sale | May 30, 2024 | — |
| 4 | Insider transaction | May 23, 2024 | May 22, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 15, 2024 | May 13, 2024 |
| 4 | Insider transaction | May 15, 2024 | May 13, 2024 |
| 3 | Initial insider ownership | May 15, 2024 | May 6, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 3, 2024 |
| 3 | Initial insider ownership | Apr 3, 2024 | Apr 3, 2024 |
| 4 | Insider transaction | Mar 11, 2024 | Mar 8, 2024 |
| 144 | Notice of proposed sale | Mar 8, 2024 | — |
| 144 | Notice of proposed sale | Mar 4, 2024 | — |
| 144 | Notice of proposed sale | Feb 27, 2024 | — |
| 4 | Insider transaction | Feb 15, 2024 | Feb 14, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 4 | Insider transaction | Feb 15, 2024 | Feb 13, 2024 |
| 144 | Notice of proposed sale | Feb 15, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 30, 2024 | — |
| 4 | Insider transaction | Nov 21, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 20, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 15, 2023 | Nov 14, 2023 |
| 4 | Insider transaction | Oct 20, 2023 | Oct 18, 2023 |
| 3 | Initial insider ownership | Oct 20, 2023 | Oct 18, 2023 |
| 4 | Insider transaction | Sep 18, 2023 | Sep 15, 2023 |
| 144 | Notice of proposed sale | Sep 6, 2023 | — |
| 4 | Insider transaction | Sep 5, 2023 | Sep 1, 2023 |
| 4 | Insider transaction | Aug 24, 2023 | Aug 23, 2023 |
| 144 | Notice of proposed sale | Aug 23, 2023 | — |
| 4 | Insider transaction | Aug 17, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 4, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 3, 2023 | Aug 1, 2023 |
| 4 | Insider transaction | Jun 14, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 14, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 6, 2023 | Jun 3, 2023 |
| 4 | Insider transaction | Jun 6, 2023 | Jun 3, 2023 |
| 4 | Insider transaction | Jun 6, 2023 | Jun 3, 2023 |
| 4 | Insider transaction | Jun 6, 2023 | Jun 3, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
| 4 | Insider transaction | May 17, 2023 | May 15, 2023 |
Showing 200 filings, the most recent 200. 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
- Semiconductors & Related Devices (SIC 3674)
- Listed as
- ALGM (Nasdaq)
- Fiscal year ends
- March 31
- Headquarters
- Manchester, NH
- SEC filer status
- Large accelerated filer
- SEC CIK
- 866291
- Former names
- ALLEGRO MICROSYSTEMS, INC. (until Oct 30, 2026); ALLEGRO MICROSYSTEMS INC (until Oct 21, 2020)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.