Who owns ALLEGRO MICROSYSTEMS, INC.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ALGM from SEC Form 13F filings across 372 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 372 institutions disclosed 148.2M shares of ALLEGRO MICROSYSTEMS, INC. worth $10.22B — about 79.8% of shares outstanding; the largest disclosed holder is FMR LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
372
13F holders
$10.22B
value, 2026 filers
79.8%
of shares outstanding (148.2M sh)
105
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ALGM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 25.6M | $1.78B | 0.1% | 13.8% | -6.7% |
| 2 | BlackRock, Inc. | 13.9M | $967.0M | 0.0% | 7.5% | +11.2% |
| 3 | Invesco Ltd. | 13.7M | $952.3M | 0.1% | 7.4% | +56.3% |
| 4 | JPMORGAN CHASE & CO | 12.7M | $844.9M | 0.0% | 6.8% | +47.1% |
| 5 | Capital Research Global Investors | 12.0M | $835.9M | 0.1% | 6.5% | -3.5% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.7M | $533.9M | 0.0% | 4.1% | -3.2% |
| 7 | STATE STREET CORP | 5.7M | $395.2M | 0.0% | 3.1% | +8.6% |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 5.5M | $383.5M | 0.0% | 3% | +0.8% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | 3.7M | $258.3M | 0.0% | 2% | +3160.4% |
| 10 | Clearbridge Investments, LLC | 2.9M | $205.1M | 0.2% | 1.6% | +2.9% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 2.6M | $184.2M | 0.0% | 1.4% | +7.7% |
| 12 | DIMENSIONAL FUND ADVISORS LP | 2.1M | $147.8M | 0.0% | 1.1% | -2.1% |
| 13 | MORGAN STANLEY | 1.8M | $126.0M | 0.0% | 1% | -20.5% |
| 14 | LOOMIS SAYLES & CO L P | 1.6M | $112.8M | 0.1% | 0.9% | -3.2% |
| 15 | GOLDMAN SACHS GROUP INC | 1.6M | $109.7M | 0.0% | 0.8% | +9.6% |
| 16 | PRINCIPAL FINANCIAL GROUP INC | 1.5M | $103.7M | 0.1% | 0.8% | -16.8% |
| 17 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.4M | $100.5M | 0.0% | 0.8% | +1983.1% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.4M | $94.7M | 0.0% | 0.7% | -2.2% |
| 19 | NORGES BANKNEW | 1.3M | $90.2M | 0.0% | 0.7% | new |
| 20 | ALLIANCEBERNSTEIN L.P. | 1.2M | $37.9M | 0.0% | 0.6% | -30.3% |
| 21 | NORTHERN TRUST CORP | 1.2M | $81.3M | 0.0% | 0.6% | +11.6% |
| 22 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.2M | $80.7M | 0.1% | 0.6% | -44.3% |
| 23 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.1M | $78.1M | 0.1% | 0.6% | -23.4% |
| 24 | VOYA INVESTMENT MANAGEMENT LLC | 966,871 | $67.3M | 0.1% | 0.5% | -33.7% |
| 25 | RAYMOND JAMES FINANCIAL INC | 928,060 | $64.6M | 0.0% | 0.5% | -6.8% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.