Allegro MicroSystems, Inc. (ALGM) ownership: Top institutional holder: FMR LLC ($864.59M). Insider activity: Net Seller (8 buys, 12 sells). 7 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| FMR LLC | 27421206.00 | $864.59M | 2026-03-31 |
| BlackRock, Inc. | 12494868.00 | $393.96M | 2026-03-31 |
| Capital Research Global Investors | 12435558.00 | $392.09M | 2026-03-31 |
| VANGUARD GROUP INC | 14202528.00 | $374.66M | 2025-12-31 |
| Invesco Ltd. | 8751481.00 | $275.93M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7920042.00 | $249.72M | 2026-03-31 |
| JPMORGAN CHASE & CO | 8652068.00 | $242.60M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 5464718.00 | $172.30M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-03 | |
| Sell | null | 2026-05-22 | |
| Sell | null | 2026-05-22 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-05-18 | |
| Sell | null | 2026-05-16 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.