MGNI Magnite, Inc.
Magnite, Inc. (MGNI) Institutional Ownership
What the institutions did with MGNI 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 |
|---|---|---|
| BlackRock, Inc. | 12.7M | 8.9% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 8.2M | 5.8% |
| FMR LLC | 7.8M | 5.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.2M | 4.4% |
| WELLINGTON MANAGEMENT GROUP LLP | 6.0M | 4.2% |
| DIMENSIONAL FUND ADVISORS LP | 5.3M | 3.7% |
| Boston Partners | 5.0M | 3.5% |
| AMERICAN CENTURY COMPANIES INC | 4.6M | 3.2% |
| Capital Research Global Investors | 3.9M | 2.7% |
| Nuveen, LLC | 3.8M | 2.7% |
| GEODE CAPITAL MANAGEMENT, LLC | 3.8M | 2.7% |
| Edenbrook Capital, LLC | 3.6M | 2.5% |
| STATE STREET CORP | 3.5M | 2.5% |
| 325 CAPITAL LLC | 3.4M | 2.4% |
| Nine Ten Capital Management LLC | 3.3M | 2.3% |
| Granahan Investment Management, LLC | 3.1M | 2.2% |
| CANADA PENSION PLAN INVESTMENT BOARD | 3.0M | 2.1% |
| JANE STREET GROUP, LLC | 2.2M | 1.5% |
| Park West Asset Management LLC | 2.0M | 1.4% |
| MORGAN STANLEY | 2.0M | 1.4% |
| Qube Research & Technologies Ltd | 2.0M | 1.4% |
| Blue Grotto Capital, LLC | 1.7M | 1.2% |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.7M | 1.2% |
| NORTHERN TRUST CORP | 1.6M | 1.1% |
| ROYCE & ASSOCIATES LP | 1.5M | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Increased | 4.5M | 7.8M | +3.3M |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 9.2M | 6.0M | -3.1M |
| CANADA PENSION PLAN INVESTMENT BOARD | Increased | 46.1K | 3.0M | +2.9M |
| No Street GP LP | Sold Out | 1.6M | 0 | -1.6M |
| 325 CAPITAL LLC | Increased | 2.0M | 3.4M | +1.4M |
| Park West Asset Management LLC | Increased | 598.4K | 2.0M | +1.4M |
| Qube Research & Technologies Ltd | Increased | 661.1K | 2.0M | +1.3M |
| DIMENSIONAL FUND ADVISORS LP | Increased | 4.0M | 5.3M | +1.3M |
| Capital Research Global Investors | Reduced | 5.0M | 3.9M | -1.2M |
| MORGAN STANLEY | Increased | 926.8K | 2.0M | +1.1M |
| BlackRock, Inc. | Increased | 11.7M | 12.7M | +1.1M |
| Schonfeld Strategic Advisors LLC | Reduced | 1.6M | 562.2K | -1.0M |
| First Eagle Investment Management, LLC | Increased | 450.3K | 1.3M | +891.3K |
| Balyasny Asset Management L.P. | Reduced | 1.5M | 666.6K | -833.9K |
| Edenbrook Capital, LLC | Increased | 2.8M | 3.6M | +757.6K |
| Ophir Asset Management Pty Ltd | Reduced | 2.1M | 1.5M | -668.0K |
| AMERIPRISE FINANCIAL INC | New | 0 | 619.6K | +619.6K |
| Man Group plc | Reduced | 664.0K | 53.1K | -610.9K |
| CITADEL ADVISORS LLC | Reduced | 1.1M | 472.9K | -580.0K |
| BANK OF MONTREAL /CAN/ | New | 0 | 533.8K | +533.8K |
| JANE STREET GROUP, LLC | Increased | 1.7M | 2.2M | +531.0K |
| Granahan Investment Management, LLC | Increased | 2.6M | 3.1M | +529.8K |
| Pacer Advisors, Inc. | Sold Out | 501.6K | 0 | -501.6K |
| EVR Research LP | New | 0 | 480.0K | +480.0K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 7.7M | 8.2M | +471.1K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 1.2M | 764.8K | -469.6K |
| Capital World Investors | Sold Out | 456.7K | 0 | -456.7K |
| CenterBook Partners LP | Reduced | 564.2K | 117.6K | -446.6K |
| Jump Financial, LLC | New | 0 | 428.0K | +428.0K |
| Blue Grotto Capital, LLC | Increased | 1.3M | 1.7M | +378.0K |
| STATE STREET CORP | Increased | 3.2M | 3.5M | +364.9K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 394.9K | 42.7K | -352.2K |
| Trexquant Investment LP | New | 0 | 333.4K | +333.4K |
| Alyeska Investment Group, L.P. | New | 0 | 326.8K | +326.8K |
| MARSHALL WACE, LLP | Increased | 42.5K | 341.9K | +299.4K |
| UBS Group AG | Increased | 450.3K | 746.4K | +296.0K |
| Boston Partners | Increased | 4.7M | 5.0M | +294.0K |
| QVT Financial LP | Increased | 453.9K | 747.4K | +293.5K |
| Caption Management, LLC | Reduced | 405.1K | 145.6K | -259.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 3.6M | 3.8M | +236.2K |
| NORTHERN TRUST CORP | Increased | 1.3M | 1.6M | +230.8K |
| Nine Ten Capital Management LLC | Reduced | 3.5M | 3.3M | -220.0K |
| Pillsbury Lake Capital LLC | New | 0 | 217.8K | +217.8K |
| Maestria Partners LLC | Reduced | 1.4M | 1.2M | -205.1K |
| Nuveen, LLC | Increased | 3.6M | 3.8M | +204.8K |
| Occam Crest Management LP | New | 0 | 195.0K | +195.0K |
| WEDGE CAPITAL MANAGEMENT L L P/NC | Sold Out | 189.8K | 0 | -189.8K |
| SEI INVESTMENTS CO | Reduced | 350.9K | 165.6K | -185.3K |
| Kopion Asset Management, LLC | Reduced | 855.9K | 674.5K | -181.5K |
| Walleye Trading LLC | Sold Out | 179.4K | 0 | -179.4K |
| GREAT LAKES ADVISORS, LLC | New | 0 | 176.6K | +176.6K |
| DEAN INVESTMENT ASSOCIATES, LLC | New | 0 | 167.9K | +167.9K |
| S SQUARED TECHNOLOGY, LLC | Increased | 402.9K | 567.9K | +165.0K |
| CLOUGH CAPITAL PARTNERS L P | New | 0 | 159.6K | +159.6K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 307.8K | 461.8K | +154.0K |
| Concentric Capital Strategies, LP | New | 0 | 146.7K | +146.7K |
| Manatuck Hill Partners, LLC | Increased | 310.0K | 450.0K | +140.0K |
| Brevan Howard Capital Management LP | Sold Out | 133.2K | 0 | -133.2K |
| TWINBEECH CAPITAL LP | Sold Out | 132.4K | 0 | -132.4K |
| ALGERT GLOBAL LLC | Reduced | 269.0K | 137.5K | -131.5K |
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.