ALGM Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. (ALGM) Institutional Ownership
What the institutions did with ALGM last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| FMR LLC | 25.6M | 17.3% |
| BlackRock, Inc. | 13.9M | 9.4% |
| Invesco Ltd. | 13.7M | 9.2% |
| JPMORGAN CHASE & CO | 12.7M | 8.6% |
| Capital Research Global Investors | 12.0M | 8.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.7M | 5.2% |
| STATE STREET CORP | 5.7M | 3.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 5.5M | 3.7% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.7M | 2.5% |
| Clearbridge Investments, LLC | 2.9M | 2.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6M | 1.8% |
| DIMENSIONAL FUND ADVISORS LP | 2.1M | 1.4% |
| MORGAN STANLEY | 1.8M | 1.2% |
| LOOMIS SAYLES & CO L P | 1.6M | 1.1% |
| GOLDMAN SACHS GROUP INC | 1.6M | 1.1% |
| PRINCIPAL FINANCIAL GROUP INC | 1.5M | 1.0% |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.4M | 1.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.4M | 0.9% |
| NORGES BANK | 1.3M | 0.9% |
| ALLIANCEBERNSTEIN L.P. | 1.2M | 0.8% |
| NORTHERN TRUST CORP | 1.2M | 0.8% |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.2M | 0.8% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.1M | 0.8% |
| VOYA INVESTMENT MANAGEMENT LLC | 966.9K | 0.7% |
| RAYMOND JAMES FINANCIAL INC | 928.1K | 0.6% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Invesco Ltd. | Increased | 8.8M | 13.7M | +4.9M |
| JPMORGAN CHASE & CO | Increased | 8.7M | 12.7M | +4.1M |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 113.8K | 3.7M | +3.6M |
| FMR LLC | Reduced | 27.4M | 25.6M | -1.8M |
| BlackRock, Inc. | Increased | 12.5M | 13.9M | +1.4M |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Increased | 69.3K | 1.4M | +1.4M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | Reduced | 2.1M | 1.2M | -921.1K |
| MARSHALL WACE, LLP | Reduced | 739.8K | 13.3K | -726.5K |
| SEGALL BRYANT & HAMILL, LLC | Reduced | 1.0M | 332.4K | -712.5K |
| ALLIANCEBERNSTEIN L.P. | Reduced | 1.7M | 1.2M | -522.2K |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | 1.5M | 966.9K | -492.4K |
| MORGAN STANLEY | Reduced | 2.3M | 1.8M | -466.0K |
| STATE STREET CORP | Increased | 5.2M | 5.7M | +448.3K |
| Capital Research Global Investors | Reduced | 12.4M | 12.0M | -429.2K |
| CITADEL ADVISORS LLC | Sold Out | 399.4K | 0 | -399.4K |
| BRAUN STACEY ASSOCIATES INC | New | 0 | 366.5K | +366.5K |
| UBS Group AG | Increased | 435.4K | 780.9K | +345.6K |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | 1.5M | 1.1M | -342.8K |
| CIBC Bancorp USA Inc. | New | 0 | 327.5K | +327.5K |
| Allspring Global Investments Holdings, LLC | Increased | 307.6K | 620.5K | +312.9K |
| Talos Eurisko Asset Management LP | Reduced | 493.2K | 182.6K | -310.6K |
| Lightrock Netherlands B.V. | Reduced | 508.0K | 206.5K | -301.5K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1.8M | 1.5M | -300.7K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 639.8K | 344.0K | -295.8K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | 308.1K | 26.8K | -281.3K |
| SIRIOS CAPITAL MANAGEMENT L P | Reduced | 298.4K | 23.4K | -275.0K |
| FIRST TRUST ADVISORS LP | Increased | 414.9K | 684.0K | +269.1K |
| Aperture Investors, LLC | Reduced | 709.7K | 443.4K | -266.2K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 7.9M | 7.7M | -251.6K |
| AMERIPRISE FINANCIAL INC | Increased | 359.3K | 608.8K | +249.5K |
| FEDERATED HERMES, INC. | Increased | 9.9K | 237.4K | +227.5K |
| Nuveen, LLC | Reduced | 947.5K | 722.6K | -224.9K |
| KENNEDY CAPITAL MANAGEMENT LLC | Reduced | 910.0K | 689.7K | -220.4K |
| Granite Investment Partners, LLC | New | 0 | 215.7K | +215.7K |
| Man Group plc | Reduced | 306.3K | 95.1K | -211.2K |
| G2 Investment Partners Management LLC | Sold Out | 208.6K | 0 | -208.6K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 2.5M | 2.6M | +188.1K |
| KETTLE HILL CAPITAL MANAGEMENT, LLC | Sold Out | 181.5K | 0 | -181.5K |
| Russell Investments Group, Ltd. | Increased | 96.1K | 272.4K | +176.3K |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | Reduced | 707.9K | 537.1K | -170.8K |
| Roubaix Capital, LLC | Sold Out | 170.0K | 0 | -170.0K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 345.1K | 493.8K | +148.6K |
| Nippon Life Global Investors Americas, Inc. | New | 0 | 143.9K | +143.9K |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 673.1K | 814.9K | +141.8K |
| GOLDMAN SACHS GROUP INC | Increased | 1.4M | 1.6M | +137.8K |
| Trexquant Investment LP | Sold Out | 133.8K | 0 | -133.8K |
| Walleye Capital LLC | Reduced | 130.7K | 2.6K | -128.1K |
| S SQUARED TECHNOLOGY, LLC | Reduced | 457.5K | 332.5K | -125.0K |
| RENAISSANCE TECHNOLOGIES LLC | Sold Out | 123.9K | 0 | -123.9K |
| NORTHERN TRUST CORP | Increased | 1.0M | 1.2M | +121.6K |
| Lisanti Capital Growth, LLC | New | 0 | 107.9K | +107.9K |
| Brevan Howard Capital Management LP | Sold Out | 95.1K | 0 | -95.1K |
| Edgestream Partners, L.P. | New | 0 | 92.2K | +92.2K |
| Clearbridge Investments, LLC | Increased | 2.9M | 2.9M | +82.5K |
| ROYAL BANK OF CANADA | Increased | 30.3K | 108.5K | +78.2K |
| CANADA PENSION PLAN INVESTMENT BOARD | Reduced | 122.0K | 44.0K | -78.0K |
| RAYMOND JAMES FINANCIAL INC | Reduced | 995.8K | 928.1K | -67.7K |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Increased | 264.0K | 330.9K | +66.9K |
| BANK OF AMERICA CORP /DE/ | Increased | 855.5K | 921.7K | +66.3K |
| XTX Topco Ltd | Reduced | 68.6K | 3.2K | -65.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.