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 | 14.71 | 27,421,206 | +16.0 | 03/31/2026 |
| BlackRock Inc | 6.70 | 12,494,868 | +2.4 | 03/31/2026 |
| Capital Research Global Investors | 6.44 | 12,006,396 | -3.5 | 06/30/2026 |
| Amvescap Plc. | 4.69 | 8,751,481 | +14.4 | 03/31/2026 |
| JPMorgan Chase & Co | 4.64 | 8,652,068 | +17.8 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.25 | 7,920,042 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Select Semiconductors | 8.17 | 15,221,087 | -9.1 | 07/31/2026 |
| American Funds Cptl Wld Gr&Inc A | 3.18 | 5,926,903 | +0.0 | 06/30/2026 |
| Capital Group World Growth & Inc Cmp | 3.18 | 5,926,903 | +0.0 | 06/30/2026 |
| American Funds SMALLCAP World A | 2.95 | 5,503,804 | -2.6 | 06/30/2026 |
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 | 7,209,544 $ | Aug 5, 2026 | direct |
| Martin Joseph R | Director | 39,430 | 1,305,133 $ | Aug 5, 2026 | direct |
| Hagen Erin | SVP, CHRO | 31,052 | 1,027,821 $ | Aug 10, 2026 | direct |
| Puma Mary G | Director | 21,734 | 719,395 $ | Aug 5, 2026 | direct |
| Palepu Krishna G. | Director | 14,212 | 470,417 $ | Aug 5, 2026 | direct |
| Raubacher Jennie | Director | 13,976 | 462,606 $ | 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: September 17, 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.