MagniteMGNI
13F holders, Q1 2026 (March 31)297holders −7
45new positions
53sold out
6famous investors
$11.89avg. 13F price*
At the end of Q1 2026, 297 institutions reported holding Magnite Inc. (MGNI) in their 13F filings, down 7 from Q4 2025. 45 opened new positions and 53 sold out. The largest holders were BlackRock, Inc. ($138.5M), Wellington Management Group LLP ($109.2M) and Vanguard Portfolio Management LLC ($91.8M). 6 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Mario Gabelli (0.0% of GAMCO Investors's portfolio).
- Company
- Magnite Inc.
- CUSIP
- 55955D100
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 45 | $36.9M |
| Exits | 53 | $104.6M |
All 13F filers, Q4 2025 → Q1 2026: 17,840,298 shares bought and 23,180,230 shares sold, net −5,339,932 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 297 holders
| BlackRock, Inc. | 0.00% | Add +0.6% | 11,657,496 | $138.5M |
| Wellington Management Group LLP | 0.02% | Add +6.5% | 9,191,077 | $109.2M |
| Vanguard Portfolio Management LLC | 0.00% | — | 7,726,205 | $91.8M |
| Vanguard Capital Management LLC | 0.00% | — | 6,190,403 | $73.5M |
| Capital Research Global Investors | 0.01% | Reduce -61.1% | 5,020,289 | $59.6M |
| Boston Partners | 0.06% | Add +14.9% | 4,719,863 | $56.1M |
| American Century Companies Inc. | 0.03% | Reduce -12.5% | 4,626,816 | $55.0M |
| FMR LLC | 0.00% | Reduce -32.7% | 4,507,419 | $53.5M |
| Dimensional Fund Advisors LP | 0.01% | Add +10.2% | 3,983,674 | $47.3M |
| Nuveen, LLC | 0.01% | Add +1.7% | 3,590,025 | $42.6M |
| Geode Capital Management, LLC | 0.00% | Add +3.5% | 3,553,790 | $42.2M |
| Nine Ten Capital Management LLC | 13.14% | Add +15.9% | 3,481,283 | $41.4M |
| State Street Corp. | 0.00% | Add +0.7% | 3,163,139 | $37.6M |
| Edenbrook Capital, LLC | 17.00% | Add +0.4% | 2,798,036 | $33.2M |
| Granahan Investment Management, LLC | 1.47% | Reduce -18.1% | 2,553,413 | $30.3M |
| Ophir Asset Management Pty Ltd | 2.93% | Reduce -11.2% | 2,118,016 | $25.2M |
| 325 Capital LLC | 8.68% | No change | 2,005,387 | $23.8M |
| Kennedy Capital Management LLC | 0.44% | Add +22.1% | 1,753,542 | $20.8M |
| Jane Street Group, LLC | 0.02% | Add +338.7% | 1,668,160 | $19.8M |
| No Street GP LP | 1.29% | Add +10.4% | 1,628,248 | $19.3M |
| Schonfeld Strategic Advisors LLC | 0.16% | Add +105.9% | 1,605,041 | $19.1M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -14.8% | 1,500,852 | $17.8M |
| Balyasny Asset Management L.P. | 0.04% | Add +71.8% | 1,500,443 | $17.8M |
| Royce & Associates LP | 0.16% | Add +17.1% | 1,365,489 | $16.2M |
| Maestria Partners LLC | 5.91% | No change | 1,363,505 | $16.2M |
| Blue Grotto Capital, LLC | 1.82% | Reduce -18.4% | 1,328,782 | $15.8M |
| Northern Trust Corp. | 0.00% | Add +4.0% | 1,322,571 | $15.7M |
| Victory Capital Management Inc. | 0.01% | Add +738.3% | 1,266,522 | $15.0M |
| Grizzlyrock Capital, LLC | 11.65% | Add +116.6% | 1,238,680 | $14.7M |
| Millennium Management | 0.01% | Add +5099.0% | 1,234,457 | $14.7M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -0.6% | 1,180,431 | $14.0M |
| Bank of New York Mellon Corp | 0.00% | Reduce -3.8% | 1,138,217 | $13.5M |
| Bank of America Corp. | 0.00% | Add +72.6% | 1,125,196 | $13.4M |
| Citadel Advisors | 0.01% | Add +93.4% | 1,052,908 | $12.5M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 997,082 | $11.8M |
| Meros Investment Management, LP | 5.11% | Add +20.2% | 992,351 | $11.8M |
| Morgan Stanley | 0.00% | Reduce -50.2% | 926,819 | $11.0M |
| Kopion Asset Management, LLC | 7.91% | Add +39.3% | 855,904 | $10.2M |
| Man Group plc | 0.02% | Add +113.1% | 663,957 | $7.9M |
| Qube Research & Technologies Ltd | 0.01% | Add +225.8% | 661,057 | $7.9M |
| Oberweis Asset Management Inc./ | 0.23% | Add +1.9% | 647,600 | $7.7M |
| Picton Mahoney Asset Management | 0.08% | Add +65.7% | 643,078 | $7.6M |
| Silvercrest Asset Management Group LLC | 0.05% | Reduce -10.1% | 616,084 | $7.3M |
| Park West Asset Management LLC | 0.63% | New | 598,380 | $7.1M |
| Nomura Asset Management Co. Ltd. | 0.02% | Reduce -4.6% | 593,900 | $7.1M |
| CenterBook Partners LP | 0.36% | Add +227.0% | 564,156 | $6.7M |
| King Luther Capital Management Corp. | 0.03% | Add +3.0% | 531,066 | $6.3M |
| Pacer Advisors, Inc. | 0.02% | New | 501,578 | $6.0M |
| JPMorgan Chase & Co. | 0.00% | Reduce -3.9% | 486,868 | $5.6M |
| Capital World Investors | 0.00% | New | 456,672 | $5.4M |
| QVT Financial LP | 0.43% | Add +640.6% | 453,910 | $5.4M |
| UBS Group AG | 0.00% | Add +11.5% | 450,349 | $5.4M |
| First Eagle Investment Management, LLC | 0.01% | Add +51.9% | 450,288 | $5.3M |
| Principal Financial Group Inc. | 0.00% | Add +88.0% | 445,950 | $5.3M |
| Nordea Investment Management AB | 0.00% | Reduce -5.4% | 421,008 | $4.9M |
| Caption Management, LLC | 0.24% | Add +2400.3% | 405,053 | $4.8M |
| S Squared Technology, LLC | 1.81% | No change | 402,862 | $4.8M |
| Two Sigma Investments, LP | 0.00% | Add +8.7% | 394,856 | $4.7M |
| Commonwealth Equity Services, LLC | 0.01% | Add +41.4% | 359,570 | $4.3M |
| Sei Investments Co. | 0.00% | Add +65.9% | 350,862 | $4.2M |
| 1492 Capital Management LLC | 1.54% | Reduce -0.3% | 340,542 | $4.0M |
| Harbor Capital Advisors, Inc. | 0.31% | Add +51.8% | 325,261 | $3.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -1.6% | 323,018 | $3.8M |
| Manatuck Hill Partners, LLC | 1.21% | Reduce -11.4% | 310,000 | $3.7M |
| Lisanti Capital Growth, LLC | 0.93% | New | 309,440 | $3.7M |
| Susquehanna International Group, LLP | 0.00% | Add +0.1% | 307,805 | $3.7M |
| Alliancebernstein L.P. | 0.00% | Add +78.1% | 223,191 | $3.6M |
| Squarepoint Ops LLC | 0.01% | Add +562.3% | 300,934 | $3.6M |
| Raymond James Financial Inc. | 0.00% | Reduce -2.0% | 291,715 | $3.5M |
| Norwood Investment Partners, LP | 5.21% | Reduce -13.6% | 285,000 | $3.4M |
| Swiss National Bank | 0.00% | Add +1.3% | 284,300 | $3.4M |
| Algert Global LLC | 0.05% | Reduce -47.2% | 269,035 | $3.2M |
| Invesco Ltd. | 0.00% | Add +7.3% | 261,370 | $3.1M |
| Senvest Management, LLC | 0.09% | No change | 224,100 | $2.7M |
| Voya Investment Management LLC | 0.00% | Reduce -4.5% | 210,567 | $2.5M |
| Hilton Capital Management, LLC | 0.19% | Add +15.3% | 208,154 | $2.5M |
| Rice Hall James & Associates, LLC | 0.13% | Reduce -3.0% | 192,808 | $2.3M |
| Wedge Capital Management L L P | 0.04% | Reduce -0.1% | 189,767 | $2.3M |
| State of Wisconsin Investment Board | 0.01% | Reduce -15.5% | 185,470 | $2.2M |
| Barclays PLC | 0.00% | Reduce -50.7% | 180,646 | $2.1M |
| Rhumbline Advisers | 0.00% | Reduce -2.2% | 179,976 | $2.1M |
| Walleye Trading LLC | 0.04% | Add +239.3% | 179,394 | $2.1M |
| California State Teachers Retirement System | 0.00% | Add +29.3% | 176,528 | $2.1M |
| P.A.W. Capital Corp. | 1.62% | Add +21.4% | 170,000 | $2.0M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -76.8% | 165,440 | $2.0M |
| LPL Financial LLC | 0.00% | Add +33.5% | 155,444 | $1.8M |
| Dba Trading, LLC | 0.89% | Add +172.7% | 150,000 | $1.8M |
| ExodusPoint Capital Management, LP | 0.02% | New | 149,219 | $1.8M |
| XTX Topco Ltd | 0.03% | Add +214.2% | 146,591 | $1.7M |
| Deutsche Bank AG | 0.00% | Add +8.7% | 139,644 | $1.7M |
| Tidal Investments LLC | 0.01% | Add +8.0% | 133,764 | $1.6M |
| Brevan Howard Capital Management LP | 0.02% | New | 133,245 | $1.6M |
| Twinbeech Capital LP | 0.16% | New | 132,379 | $1.6M |
| Quantinno Capital Management LP | 0.00% | Add +144.3% | 128,133 | $1.5M |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 126,372 | $1.5M |
| Legal & General Group Plc | 0.00% | Reduce -18.0% | 122,047 | $1.4M |
| AQR Capital Management | 0.00% | Add +24.3% | 121,212 | $1.4M |
| Perkins Capital Management Inc. | 1.33% | Reduce -2.0% | 119,275 | $1.4M |
| Radcliffe Capital Management, L.P. | 0.15% | Add +28.6% | 112,400 | $1.3M |
| Penbrook Management LLC | 1.01% | Add +260.6% | 112,190 | $1.3M |
"% of holder's portfolio" is MGNI's weight in each manager's 13F, not the share of Magnite Inc. the manager owns.