MAGNITE INC (MGNI)
Institutional ownership reported to the SEC as of Q2 2026, across 30 quarters.
303
Reporting holders
$2.9B
Reported value
99.4%
Of shares outstanding
5.8%
Held as options
+24
Holder change
Institutions report 142,558,561 shares against 143,424,157 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. A figure this high can overstate: where an adviser and a sub-adviser both report the same shares, both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $241.3M | 12,713,156 | 0.00% | 8q | +9.1%+$20.0M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $155.6M | 8,197,286 | 0.01% | 2q | +6.1%+$8.9M |
| FMR LLC | $147.3M | 7,759,426 | 0.01% | 23q | +72.1%+$61.7M |
| VANGUARD CAPITAL MANAGEMENT LLC | $118.2M | 6,225,195 | 0.00% | 2q | +0.6%+$660.4K |
| WELLINGTON MANAGEMENT GROUP LLP | $114.7M | 6,044,492 | 0.02% | 16q | -34.2%-$59.7M |
| DIMENSIONAL FUND ADVISORS LP | $99.8M | 5,260,132 | 0.02% | 24q | +32.0%+$24.2M |
| Boston Partners | $95.9M | 5,013,835 | 0.09% | 9q | +6.2%+$5.6M |
| AMERICAN CENTURY COMPANIES INC | $87.7M | 4,622,736 | 0.04% | 15q | HELD |
| Capital Research Global Investors | $73.4M | 3,869,159 | 0.01% | 7q | -22.9%-$21.8M |
| Nuveen, LLC | $72.0M | 3,794,811 | 0.02% | 6q | +5.7%+$3.9M |
| GEODE CAPITAL MANAGEMENT, LLC | $71.9M | 3,789,959 | 0.00% | 24q | +6.6%+$4.5M |
| Edenbrook Capital, LLC | $67.5M | 3,555,615 | 13.60% | 24q | +27.1%+$14.4M |
| STATE STREET CORP | $67.0M | 3,528,075 | 0.00% | 24q | +11.5%+$6.9M |
| 325 CAPITAL LLC | $64.8M | 3,412,694 | 15.44% | 4q | +70.2%+$26.7M |
| Nine Ten Capital Management LLC | $61.9M | 3,261,283 | 19.26% | 12q | -6.3%-$4.2M |
| Granahan Investment Management, LLC | $58.5M | 3,083,211 | 2.09% | 25q | +20.7%+$10.1M |
| CANADA PENSION PLAN INVESTMENT BOARD | $56.8M | 2,995,093 | 0.03% | 4q | +6403.7%+$56.0M |
| JANE STREET GROUP, LLC | $45.3M | 2,199,191 | 0.00% | 15q | +31.8%+$10.9M |
| Park West Asset Management LLC | $42.7M | 2,000,000 | 2.91% | 2q | +234.2%+$29.9M |
| Caption Management, LLC | $38.0M | 145,590 | 0.18% | 12q | -64.1%-$67.6M |
| MORGAN STANLEY | $37.8M | 1,991,732 | 0.00% | 24q | +114.9%+$20.2M |
| CITADEL ADVISORS LLC | $37.6M | 472,865 | 0.00% | 24q | -55.1%-$46.1M |
| Qube Research & Technologies Ltd | $37.1M | 1,955,989 | 0.03% | 4q | +195.9%+$24.6M |
| Blue Grotto Capital, LLC | $32.4M | 1,706,741 | 2.70% | 5q | +28.4%+$7.2M |
| KENNEDY CAPITAL MANAGEMENT LLC | $31.6M | 1,666,799 | 0.56% | 20q | -4.9%-$1.6M |
| NORTHERN TRUST CORP | $29.5M | 1,553,412 | 0.00% | 24q | +17.5%+$4.4M |
| ROYCE & ASSOCIATES LP | $28.0M | 1,473,397 | 0.23% | 24q | +7.9%+$2.0M |
| GOLDMAN SACHS GROUP INC | $27.8M | 1,466,640 | 0.00% | 24q | -2.3%-$649.3K |
| Ophir Asset Management Pty Ltd | $27.5M | 1,450,061 | 2.26% | 3q | -31.5%-$12.7M |
| PICTON MAHONEY ASSET MANAGEMENT | $27.4M | 691,471 | 0.20% | 5q | +7.5%+$1.9M |
| BANK OF MONTREAL /CAN/ | $26.7M | 533,757 | 0.01% | new | NEW |
| VICTORY CAPITAL MANAGEMENT INC | $23.4M | 1,235,384 | 0.01% | 24q | -2.5%-$591.0K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $22.8M | 1,203,189 | 0.00% | 24q | +1.9%+$431.9K |
| Sixth Street Partners Management Company, L.P. | $22.8M | 1,203,189 | 0.00% | new | NEW |
| BANK OF AMERICA CORP /DE/ | $22.4M | 1,181,832 | 0.00% | 24q | +5.0%+$1.1M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $22.3M | 461,849 | 0.00% | 24q | +50.0%+$7.4M |
| GRIZZLYROCK CAPITAL, LLC | $22.1M | 1,164,628 | 15.46% | 11q | -6.0%-$1.4M |
| Bank of New York Mellon Corp | $22.1M | 1,162,198 | 0.00% | 24q | +2.1%+$455.2K |
| Maestria Partners LLC | $22.0M | 1,158,430 | 7.65% | 7q | -15.0%-$3.9M |
| Walleye Trading LLC | $20.4M | options only | 0.02% | 23q | OPTIONS |
| Meros Investment Management, LP | $18.8M | 991,335 | 5.97% | 19q | HELD |
| VANGUARD FIDUCIARY TRUST CO | $18.8M | 989,092 | 0.00% | 2q | -0.8%-$151.7K |
| Squarepoint Ops LLC | $15.6M | 230,234 | 0.02% | 13q | -23.5%-$4.8M |
| MILLENNIUM MANAGEMENT LLC | $14.5M | 764,819 | 0.01% | 4q | -38.0%-$8.9M |
| QVT Financial LP | $14.2M | 747,437 | 0.83% | 3q | +64.7%+$5.6M |
| UBS Group AG | $14.2M | 746,350 | 0.00% | 24q | +65.7%+$5.6M |
| OBERWEIS ASSET MANAGEMENT INC/ | $14.0M | 735,000 | 0.29% | 9q | +13.5%+$1.7M |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $13.4M | 707,749 | 0.09% | 23q | +14.9%+$1.7M |
| Kopion Asset Management, LLC | $12.8M | 674,451 | 8.09% | 24q | -21.2%-$3.4M |
| First Eagle Investment Management, LLC | $12.7M | 670,788 | 0.02% | 7q | +49.0%+$4.2M |
| Balyasny Asset Management L.P. | $12.7M | 666,554 | 0.02% | 5q | -55.6%-$15.8M |
| AMERIPRISE FINANCIAL INC | $11.8M | 619,573 | 0.00% | new | NEW |
| S SQUARED TECHNOLOGY, LLC | $10.8M | 567,862 | 3.34% | 21q | +41.0%+$3.1M |
| Schonfeld Strategic Advisors LLC | $10.7M | 562,195 | 0.04% | 3q | -65.0%-$19.8M |
| NOMURA ASSET MANAGEMENT CO LTD | $10.5M | 553,900 | 0.02% | 8q | -6.7%-$759.2K |
| KING LUTHER CAPITAL MANAGEMENT CORP | $9.6M | 503,581 | 0.04% | 24q | -5.2%-$521.7K |
| PRINCIPAL FINANCIAL GROUP INC | $9.4M | 497,522 | 0.00% | 14q | +11.6%+$978.8K |
| EVR Research LP | $9.1M | 480,000 | 4.50% | new | NEW |
| Manatuck Hill Partners, LLC | $8.5M | 450,000 | 2.83% | 24q | +45.2%+$2.7M |
| IMC-Chicago, LLC | $8.2M | 33,508 | 0.00% | 12q | +20.6%+$1.4M |
| Jump Financial, LLC | $8.1M | 428,036 | 0.07% | new | NEW |
| JPMORGAN CHASE & CO | $7.9M | 407,025 | 0.00% | 24q | -16.4%-$1.5M |
| NORDEA INVESTMENT MANAGEMENT AB | $7.4M | 386,327 | 0.01% | 21q | -8.2%-$662.4K |
| COMMONWEALTH EQUITY SERVICES, LLC | $7.0M | 368,199 | 0.01% | 24q | +2.4%+$163.8K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $6.9M | 364,638 | 0.00% | 24q | +12.9%+$789.9K |
| MARSHALL WACE, LLP | $6.5M | 341,864 | 0.01% | 4q | +705.0%+$5.7M |
| DEAN INVESTMENT ASSOCIATES, LLC | $6.4M | 335,854 | 0.42% | new | NEW |
| Trexquant Investment LP | $6.3M | 333,429 | 0.04% | new | NEW |
| Alyeska Investment Group, L.P. | $6.2M | 326,839 | 0.02% | new | NEW |
| P.A.W. CAPITAL CORP | $6.1M | 320,000 | 2.33% | 24q | -5.9%-$379.6K |
| 1492 Capital Management LLC | $6.0M | 317,750 | 1.78% | 11q | -6.7%-$432.6K |
| RAYMOND JAMES FINANCIAL INC | $5.9M | 309,931 | 0.00% | 7q | +6.2%+$345.7K |
| Swiss National Bank | $5.5M | 289,700 | 0.00% | 24q | +1.9%+$102.5K |
| Lisanti Capital Growth, LLC | $5.5M | 289,030 | 1.21% | 2q | -6.6%-$387.4K |
| RICE HALL JAMES & ASSOCIATES, LLC | $5.4M | 283,919 | 0.26% | 7q | +47.3%+$1.7M |
| ExodusPoint Capital Management, LP | $5.2M | 271,869 | 0.03% | 2q | +82.2%+$2.3M |
| Norwood Investment Partners, LP | $4.5M | 235,000 | 6.16% | 5q | -17.5%-$949.0K |
| BARCLAYS PLC | $4.4M | 233,693 | 0.00% | 18q | +29.4%+$1.0M |
| Senvest Management, LLC | $4.3M | 224,100 | 0.12% | 3q | HELD |
| Invesco Ltd. | $4.2M | 222,213 | 0.00% | 24q | -15.0%-$743.2K |
| Hilton Capital Management, LLC | $4.2M | 219,406 | 0.28% | 13q | +5.4%+$213.6K |
| Pillsbury Lake Capital LLC | $4.1M | 217,753 | 1.13% | new | NEW |
| Occam Crest Management LP | $4.0M | 195,000 | 2.07% | new | NEW |
| GROUP ONE TRADING LLC | $3.9M | options only | 0.01% | 24q | OPTIONS |
| Cerity Partners LLC | $3.8M | 200,984 | 0.00% | 16q | +98.6%+$1.9M |
| VOYA INVESTMENT MANAGEMENT LLC | $3.7M | 196,662 | 0.00% | 24q | -6.6%-$263.9K |
| RHUMBLINE ADVISERS | $3.7M | 195,811 | 0.00% | 24q | +8.8%+$300.5K |
| GREAT LAKES ADVISORS, LLC | $3.4M | 176,615 | 0.03% | new | NEW |
| AQR CAPITAL MANAGEMENT LLC | $3.4M | 176,599 | 0.00% | 7q | +45.7%+$1.1M |
| STATE OF WISCONSIN INVESTMENT BOARD | $3.3M | 172,277 | 0.01% | 21q | -7.1%-$250.4K |
| Legato Capital Management LLC | $3.2M | 166,918 | 0.26% | 2q | +96.9%+$1.6M |
| Tidal Investments LLC | $3.1M | 165,838 | 0.01% | 11q | +24.0%+$608.8K |
| SEI INVESTMENTS CO | $3.1M | 165,553 | 0.00% | 8q | -52.8%-$3.5M |
| DEUTSCHE BANK AG\ | $3.1M | 165,040 | 0.00% | 24q | +18.2%+$482.0K |
| LPL Financial LLC | $3.1M | 163,837 | 0.00% | 9q | +5.4%+$159.3K |
| Quantinno Capital Management LP | $3.1M | 161,782 | 0.00% | 5q | +26.3%+$638.7K |
| CLOUGH CAPITAL PARTNERS L P | $3.0M | 159,586 | 0.25% | new | NEW |
| Concentric Capital Strategies, LP | $2.8M | 146,698 | 0.15% | new | NEW |
| VANGUARD ASSET MANAGEMENT, Ltd | $2.7M | 140,438 | 0.00% | 2q | +11.1%+$267.0K |
| ALGERT GLOBAL LLC | $2.6M | 137,505 | 0.03% | 4q | -74.4%-$7.6M |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-13 | 13G/A | Wellington Management Group LLPwith 2 co-filers | 4.2% |
| 2026-08-06 | 13G | FMR LLCwith 1 co-filers | 5.4% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 303 | $2.9B | 142,558,561 | 57 | 113 | 83 | 5.8% |
| Q1 2026 | 279 | $1.6B | 130,770,459 | 41 | 108 | 73 | 4.9% |
| Q4 2025 | 288 | $2.4B | 136,023,236 | 42 | 109 | 87 | 7.1% |
| Q3 2025 | 299 | $3.2B | 134,716,650 | 63 | 72 | 116 | 7.1% |
| Q2 2025 | 268 | $3.7B | 145,367,527 | 45 | 88 | 97 | 6.0% |
| Q1 2025 | 278 | $1.6B | 131,915,550 | 47 | 92 | 94 | 5.5% |
| Q4 2024 | 270 | $2.1B | 122,129,928 | 39 | 88 | 84 | 6.6% |
| Q3 2024 | 258 | $1.7B | 119,068,136 | 41 | 93 | 68 | 5.3% |
| Q2 2024 | 244 | $1.4B | 103,810,230 | 55 | 91 | 61 | 4.9% |
| Q1 2024 | 217 | $1.2B | 104,045,178 | 35 | 67 | 64 | 3.9% |
| Q4 2023 | 199 | $1.0B | 103,591,978 | 20 | 55 | 60 | 3.9% |
| Q3 2023 | 197 | $814.2M | 102,753,072 | 35 | 59 | 57 | 4.9% |
| Q2 2023 | 200 | $1.4B | 100,193,861 | 31 | 62 | 55 | 5.2% |
| Q1 2023 | 188 | $967.6M | 98,634,499 | 29 | 59 | 48 | 5.6% |
| Q4 2022 | 189 | $934.7M | 82,020,627 | 43 | 51 | 53 | 7.1% |
| Q3 2022 | 214 | $715.7M | 103,312,386 | 22 | 68 | 71 | 5.1% |
| Q2 2022 | 231 | $837.5M | 87,999,136 | 35 | 70 | 73 | 6.7% |
| Q1 2022 | 230 | $1.2B | 88,870,871 | 26 | 91 | 52 | 5.4% |
| Q4 2021 | 253 | $1.7B | 90,282,858 | 33 | 88 | 72 | 8.5% |
| Q3 2021 | 282 | $2.7B | 90,114,913 | 53 | 97 | 74 | 7.8% |
| Q2 2021 | 273 | $3.3B | 85,330,024 | 52 | 94 | 76 | 13.0% |
| Q1 2021 | 283 | $4.2B | 86,139,091 | 80 | 76 | 98 | 15.5% |
| Q4 2020 | 242 | $2.7B | 78,159,351 | 91 | 58 | 69 | 12.7% |
| Q3 2020 | 173 | $595.3M | 83,280,399 | 168 | 3 | 1 | 2.9% |
| Q2 2020 | 11 | $96.2M | 14,428,378 | 10 | 0 | 0 | 0.0% |
| Q1 2020 | 1 | $7.0K | 203 | 0 | 0 | 0 | 0.0% |
| Q4 2019 | 1 | $7.0K | 203 | 0 | 0 | 0 | 0.0% |
| Q3 2019 | 1 | $7.0K | 203 | 0 | 0 | 0 | 0.0% |
| Q2 2019 | 1 | $7.0K | 203 | 0 | 0 | 0 | 0.0% |
| Q1 2019 | 1 | $7.0K | 203 | 1 | 0 | 0 | 0.0% |