Allegro Microsystems, Inc.
ALGM- Exchange
- Nasdaq
- Industry
- Semiconductors & Related Devices
- SEC CIK
- 0000866291
In the last 90 days, Allegro Microsystems, Inc. insiders filed 0 open-market purchases and 2 sales; 375 institutions reported holding it in 13F filings for Q2 2026, worth $10.2B in total; Maverick Capital is the only superinvestor holding it.
Holders of 5% or more of ALGM
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Allegro Microsystems, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| FMR LLC | 13G/A | 13.70%25.6M shares | −1.10 ppfrom 14.80% | Feb 12, 20255 filings | Aug 6, 2026 | SEC |
| Invesco Ltd. | 13G | 7.30%13.7M shares | New | Aug 13, 20261 filing | Aug 13, 2026 | SEC |
| Capital Research Global Investors | 13G/A | 7.10%13.1M shares | −1.50 ppfrom 8.60% | May 13, 20253 filings | Feb 12, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 6.90%12.8M shares | – | Jul 27, 20261 filing | Jul 27, 2026 | SEC |
| JPMorgan Chase & Co | 13G | 6.80%12.7M shares | +2.00 ppfrom 4.80% | Apr 15, 20252 filings | Jul 16, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
15 Schedule 13D and 13G filings on Allegro Microsystems, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 13, 20262:05 PM ET | Invesco Ltd. | 13G | 7.30%13.7M shares | New | Jun 30, 2026 | SEC |
| Aug 6, 202610:14 AM ET | FMR LLCand 1 other | 13G/A | 13.70%25.6M shares | −1.10 ppfrom 14.80% | Jun 30, 2026 | SEC |
| Jul 27, 20264:25 PM ET | BlackRock, Inc. | 13G/A | 6.90%12.8M shares | – | Jun 30, 2026 | SEC |
| Jul 16, 20262:26 PM ET | JPMorgan Chase & Co | 13G | 6.80%12.7M shares | +2.00 ppfrom 4.80% | Jun 30, 2026 | SEC |
| May 6, 202611:00 AM ET | FMR LLCand 1 other | 13G/A | 14.80%27.4M shares | +2.00 ppfrom 12.80% | Mar 31, 2026 | SEC |
| Mar 26, 20263:25 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Feb 12, 202610:25 AM ET | Capital Research Global Investors | 13G/A | 7.10%13.1M shares | −1.50 ppfrom 8.60% | Dec 31, 2025 | SEC |
| Feb 5, 20261:16 PM ET | FMR LLCand 1 other | 13G/A | 12.80%23.6M shares | −1.80 ppfrom 14.60% | Dec 31, 2025 | SEC |
| Aug 13, 202511:37 AM ET | Capital Research Global Investors | 13G/A | 8.60%15.9M shares | +2.60 ppfrom 6.00% | Jun 30, 2025 | SEC |
| May 13, 202511:32 AM ET | Capital Research Global Investors | 13G | 6.00%11.1M shares | New | Mar 31, 2025 | SEC |
| May 12, 202510:24 AM ET | FMR LLCand 1 other | 13G/A | 14.60%26.9M shares | +2.20 ppfrom 12.40% | Mar 31, 2025 | SEC |
| Apr 15, 20255:01 PM ET | JPMorgan Chase & Co | 13G/A | 4.80%9.00M shares | –Below 5% | Mar 31, 2025 | SEC |
| Feb 12, 20259:16 AM ET | FMR LLCand 1 other | 13G/A | 12.40%22.8M shares | – | Dec 31, 2024 | SEC |
| Feb 8, 2021 | Oep Skna, L.P. | 13GOld format | – | New | – | SEC |
| Feb 8, 2021 | Sanken Electric Co., Ltd. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Allegro Microsystems, Inc. shares.
No Form 144 notices for Allegro Microsystems, Inc. are on file.