Allegro Microsystems Inc
Ownership
Ownership Structure
Who owns Allegro Microsystems Inc (ALGM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 67.1% of the shares are freely tradable; institutional investors hold 76.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 13.72 | 25,581,021 | -6.7 | 06/30/2026 |
| BlackRock Inc | 7.45 | 13,889,324 | +11.2 | 06/30/2026 |
| Amvescap Plc. | 7.34 | 13,678,393 | +56.3 | 06/30/2026 |
| JPMorgan Chase & Co | 6.83 | 12,723,790 | +47.1 | 06/30/2026 |
| Capital Research Global Investors | 6.44 | 12,006,396 | -3.5 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.11 | 7,668,472 | -3.2 | 06/30/2026 |
| State Street Corp | 3.05 | 5,676,421 | +8.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.96 | 5,508,806 | +0.8 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Select Semiconductors | 6.41 | 11,954,087 | -21.5 | 08/31/2026 |
| American Funds Cptl Wld Gr&Inc A | 3.18 | 5,926,903 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Suzuki Yoshihiro | Director | 217,811 | 6,643,236 $ | Aug 5, 2026 | direct |
| Martin Joseph R | Director | 39,430 | 1,202,615 $ | Aug 5, 2026 | direct |
| Hagen Erin | SVP, CHRO | 31,052 | 947,086 $ | Aug 10, 2026 | direct |
| Puma Mary G | Director | 21,734 | 662,887 $ | Aug 5, 2026 | direct |
| Palepu Krishna G. | Director | 14,212 | 433,466 $ | Aug 5, 2026 | direct |
| Raubacher Jennie | Director | 13,976 | 426,268 $ | Aug 17, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 17, 2026 | Raubacher Jennie | Director | Sell | 1,000 | 45.32 | 45,320 |
| Aug 10, 2026 | Hagen Erin | SVP, CHRO | Sell | 2,285 | 44.39 | 101,431 |
| Aug 5, 2026 | Suzuki Yoshihiro | Director | Other | 4,251 | 0.00 | – |
| Aug 5, 2026 | Martin Joseph R | Director | Other | 4,251 | 0.00 | – |
| Aug 5, 2026 | Puma Mary G | Director | Other | 4,251 | 0.00 | – |
| Aug 5, 2026 | Palepu Krishna G. | Director | Other | 4,251 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.