MGNI · Magnite, Inc.
Market Cap
$3.28B
Shares
143.42M
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 309
Total Value: $2,836,659,978
Total Shares: 149,455,387
Showing 1–100
of 327 holdings by value
· page 1 of 4
Institutional Ownership Trend
26 quarters
Superinvestors Holding MGNI
All superinvestors →Holder Concentration
Across 309 13F filers · Δ vs Mar 31, 2026Top Holder
8.5%
+0.1 pts
Top 5
27.4%
−1.5 pts
Top 10
42.5%
−1.9 pts
HHI
276
Broadly held−15
Quarterly Activity
vs Mar 31, 2026
New
55
Increased
116
Decreased
90
Sold Out
44
Unchanged
48
Holder count:
+11
Institutional value:
+73.2%
Shares held:
+8.4%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega FMR LLC | +3,252,007 | 7,759,426 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD | +2,949,041 | 2,995,093 | |
| Mid Park West Asset Management LLC | +1,651,620 | 2,250,000 | |
| Small 325 CAPITAL LLC | +1,407,307 | 3,412,694 | |
| Mega Qube Research & Technologies Ltd | +1,294,932 | 1,955,989 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega WELLINGTON MANAGEMENT GROUP LLP | −3,146,585 | 6,044,492 | |
| Mega Capital Research Global Investors | −1,151,130 | 3,869,159 | |
| Large Schonfeld Strategic Advisors LLC | −1,042,846 | 562,195 | |
| Large Balyasny Asset Management L.P. | −833,889 | 666,554 | |
| Mid Ophir Asset Management Pty Ltd | −667,955 | 1,450,061 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega BANK OF MONTREAL /CAN/ | 1,408,757 | $26,738,206 | |
| Mega AMERIPRISE FINANCIAL INC | 619,573 | $11,759,494 | |
| Small EVR Research LP | 480,000 | $9,110,400 | |
| Mid Jump Financial, LLC | 428,036 | $8,124,122 | |
| Large Trexquant Investment LP | 333,429 | $6,328,482 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mid No Street GP LP | 1,628,248 | $19,343,586 | |
| Large Pacer Advisors, Inc. | 501,578 | $5,958,746 | |
| Mega Capital World Investors | 456,672 | $5,425,263 | |
| Mid WEDGE CAPITAL MANAGEMENT L L P/NC | 189,767 | $2,254,431 | |
| Mid Brevan Howard Capital Management LP | 133,245 | $1,582,950 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $241,295,693 | 8.51% | 12,713,156 | Shares | 2026-08-07 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $155,584,488 | 5.48% | 8,197,286 | Shares | 2026-08-13 | |
| Mega FMR LLC | $147,273,904 | 5.19% | 7,759,426 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $118,154,201 | 4.17% | 6,225,195 | Shares | 2026-08-13 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP | $114,724,456 | 4.04% | 6,044,492 | Shares | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP | $99,837,303 | 3.52% | 5,260,132 | Shares | 2026-08-11 | |
| Mega Boston Partners | $95,162,587 | 3.35% | 5,013,835 | Shares | 2026-08-04 | |
| Mega AMERICAN CENTURY COMPANIES INC | $87,739,529 | 3.09% | 4,622,736 | Shares | 2026-08-12 | |
| Mega Capital Research Global Investors | $73,436,637 | 2.59% | 3,869,159 | Shares | 2026-08-12 | |
| Mega Nuveen, LLC | $72,025,511 | 2.54% | 3,794,811 | Shares | 2026-08-11 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $71,933,420 | 2.54% | 3,789,959 | Shares | 2026-08-12 | |
| Small Edenbrook Capital, LLC | $67,485,572 | 2.38% | 3,555,615 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP | $66,962,863 | 2.36% | 3,528,075 | Shares | 2026-08-07 | |
| Small 325 CAPITAL LLC | $64,772,932 | 2.28% | 3,412,694 | Shares | 2026-08-14 | |
| Small Nine Ten Capital Management LLC | $61,899,151 | 2.18% | 3,261,283 | Shares | 2026-08-14 | |
| Mid Granahan Investment Management, LLC | $58,519,344 | 2.06% | 3,083,211 | Shares | 2026-08-14 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD Pension | $56,846,865 | 2.00% | 2,995,093 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $41,740,645 | 1.47% | 2,199,191 | Shares | 2026-08-14 | |
| Mid Park West Asset Management LLC | $37,960,000 | 1.34% | 2,000,000 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY | $37,803,070 | 1.33% | 1,991,732 | Shares | 2026-08-13 | |
| Mega Qube Research & Technologies Ltd | $37,124,671 | 1.31% | 1,955,989 | Shares | 2026-08-14 | |
| Mid Blue Grotto Capital, LLC | $32,393,944 | 1.14% | 1,706,741 | Shares | 2026-08-03 | |
| Mid KENNEDY CAPITAL MANAGEMENT LLC | $31,635,845 | 1.12% | 1,666,799 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $29,483,758 | 1.04% | 1,553,412 | Shares | 2026-08-13 | |
| Large Caption Management, LLC | $28,470,000 | 1.00% | 1,500,000 | Put | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP | $27,965,075 | 0.99% | 1,473,397 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC | $27,836,827 | 0.98% | 1,466,640 | Shares | 2026-08-14 | |
| Mid Ophir Asset Management Pty Ltd | $27,522,157 | 0.97% | 1,450,061 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC | $23,447,588 | 0.83% | 1,235,384 | Shares | 2026-08-07 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $22,836,527 | 0.81% | 1,203,189 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $22,431,169 | 0.79% | 1,181,832 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $22,174,334 | 0.78% | 1,168,300 | Put | 2026-08-14 | |
| Small GRIZZLYROCK CAPITAL, LLC | $22,104,639 | 0.78% | 1,164,628 | Shares | 2026-08-14 | |
| Mega Bank of New York Mellon Corp Bank | $22,058,512 | 0.78% | 1,162,198 | Shares | 2026-08-06 | |
| Small Maestria Partners LLC | $21,987,001 | 0.78% | 1,158,430 | Shares | 2026-08-05 | |
| Small Meros Investment Management, LP | $18,815,538 | 0.66% | 991,335 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $18,772,966 | 0.66% | 989,092 | Shares | 2026-08-13 | |
| Large Walleye Trading LLC | $15,709,746 | 0.55% | 827,700 | Call | 2026-08-03 | |
| Mega MILLENNIUM MANAGEMENT LLC | $14,516,264 | 0.51% | 764,819 | Shares | 2026-08-14 | |
| Large PICTON MAHONEY ASSET MANAGEMENT | $14,235,000 | 0.50% | 750,000 | Call | 2026-08-13 | |
| Mid QVT Financial LP | $14,186,354 | 0.50% | 747,437 | Shares | 2026-08-14 | |
| Mega UBS Group AG | $14,165,722 | 0.50% | 746,350 | Shares | 2026-08-13 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $14,045,200 | 0.50% | 740,000 | Call | 2026-08-12 | |
| Mid OBERWEIS ASSET MANAGEMENT INC/ | $13,950,300 | 0.49% | 735,000 | Shares | 2026-08-14 | |
| Large SILVERCREST ASSET MANAGEMENT GROUP LLC | $13,433,076 | 0.47% | 707,749 | Shares | 2026-08-14 | |
| Large PICTON MAHONEY ASSET MANAGEMENT | $13,124,119 | 0.46% | 691,471 | Shares | 2026-08-13 | |
| Small Kopion Asset Management, LLC | $12,801,079 | 0.45% | 674,451 | Shares | 2026-07-07 | |
| Large First Eagle Investment Management, LLC | $12,731,556 | 0.45% | 670,788 | Shares | 2026-08-24 | |
| Large Balyasny Asset Management L.P. | $12,651,194 | 0.45% | 666,554 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC | $11,759,494 | 0.41% | 619,573 | Shares | 2026-08-14 | |
| Large Squarepoint Ops LLC | $11,201,996 | 0.39% | 590,200 | Put | 2026-08-14 | |
| Small S SQUARED TECHNOLOGY, LLC | $10,778,020 | 0.38% | 567,862 | Shares | 2026-08-14 | |
| Large Schonfeld Strategic Advisors LLC | $10,670,461 | 0.38% | 562,195 | Shares | 2026-08-14 | |
| Large NOMURA ASSET MANAGEMENT CO LTD | $10,513,022 | 0.37% | 553,900 | Shares | 2026-08-13 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $10,130,706 | 0.36% | 533,757 | Shares | 2026-08-12 | |
| Large KING LUTHER CAPITAL MANAGEMENT CORP | $9,557,967 | 0.34% | 503,581 | Shares | 2026-08-10 | |
| Mega PRINCIPAL FINANCIAL GROUP INC | $9,442,966 | 0.33% | 497,522 | Shares | 2026-08-04 | |
| Small EVR Research LP | $9,110,400 | 0.32% | 480,000 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC | $8,974,977 | 0.32% | 472,865 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $8,765,894 | 0.31% | 461,849 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $8,687,146 | 0.31% | 457,700 | Call | 2026-08-14 | |
| Small Manatuck Hill Partners, LLC | $8,541,000 | 0.30% | 450,000 | Shares | 2026-08-14 | |
| Mid Jump Financial, LLC | $8,124,122 | 0.29% | 428,036 | Shares | 2026-08-13 | |
| Mega JPMORGAN CHASE & CO | $7,725,333 | 0.27% | 407,025 | Shares | 2026-08-12 | |
| Mega NORDEA INVESTMENT MANAGEMENT AB | $7,332,485 | 0.26% | 386,327 | Shares | 2026-08-05 | |
| Large COMMONWEALTH EQUITY SERVICES, LLC | $6,988,417 | 0.25% | 368,199 | Shares | 2026-07-29 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $6,920,824 | 0.24% | 364,638 | Shares | 2026-08-13 | |
| Large Caption Management, LLC | $6,718,920 | 0.24% | 354,000 | Call | 2026-08-14 | |
| Large MARSHALL WACE, LLP | $6,488,578 | 0.23% | 341,864 | Shares | 2026-08-13 | |
| Mega CITADEL ADVISORS LLC | $6,413,342 | 0.23% | 337,900 | Call | 2026-08-14 | |
| Large Trexquant Investment LP | $6,328,482 | 0.22% | 333,429 | Shares | 2026-08-14 | |
| Large Alyeska Investment Group, L.P. | $6,203,404 | 0.22% | 326,839 | Shares | 2026-08-14 | |
| Small 1492 Capital Management LLC | $6,030,895 | 0.21% | 317,750 | Shares | 2026-08-11 | |
| Mid HARBOR CAPITAL ADVISORS, INC. | $5,928,801 | 0.21% | 312,371 | Shares | 2026-08-07 | |
| Mega RAYMOND JAMES FINANCIAL INC | $5,882,488 | 0.21% | 309,931 | Shares | 2026-08-14 | |
| Mega Swiss National Bank Bank | $5,498,506 | 0.19% | 289,700 | Shares | 2026-08-11 | |
| Small Lisanti Capital Growth, LLC | $5,485,789 | 0.19% | 289,030 | Shares | 2026-08-10 | |
| Mid RICE HALL JAMES & ASSOCIATES, LLC | $5,388,782 | 0.19% | 283,919 | Shares | 2026-08-07 | |
| Large ExodusPoint Capital Management, LP | $5,160,073 | 0.18% | 271,869 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $4,820,920 | 0.17% | 254,000 | Put | 2026-08-14 | |
| Mid Park West Asset Management LLC | $4,745,000 | 0.17% | 250,000 | Call | 2026-08-14 | |
| Large Walleye Trading LLC | $4,672,876 | 0.16% | 246,200 | Put | 2026-08-03 | |
| Micro Norwood Investment Partners, LP | $4,460,300 | 0.16% | 235,000 | Shares | 2026-08-12 | |
| Mega BARCLAYS PLC | $4,435,492 | 0.16% | 233,693 | Shares | 2026-08-14 | |
| Large Squarepoint Ops LLC | $4,369,841 | 0.15% | 230,234 | Shares | 2026-08-14 | |
| Mid Senvest Management, LLC | $4,253,418 | 0.15% | 224,100 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. | $4,217,600 | 0.15% | 222,213 | Shares | 2026-08-14 | |
| Small Hilton Capital Management, LLC | $4,164,325 | 0.15% | 219,406 | Shares | 2026-08-04 | |
| Small Pillsbury Lake Capital LLC | $4,132,951 | 0.15% | 217,753 | Shares | 2026-08-14 | |
| Large Cerity Partners LLC | $3,814,675 | 0.13% | 200,984 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $3,785,466 | 0.13% | 199,445 | Shares | 2026-08-14 | |
| Large VOYA INVESTMENT MANAGEMENT LLC | $3,732,643 | 0.13% | 196,662 | Shares | 2026-08-12 | |
| Mega RHUMBLINE ADVISERS | $3,716,492 | 0.13% | 195,811 | Shares | 2026-08-12 | |
| Small Occam Crest Management LP | $3,701,100 | 0.13% | 195,000 | Shares | 2026-08-14 | |
| Large GREAT LAKES ADVISORS, LLC | $3,352,152 | 0.12% | 176,615 | Shares | 2026-08-10 | |
| Mega AQR CAPITAL MANAGEMENT LLC | $3,351,844 | 0.12% | 176,599 | Shares | 2026-08-14 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD | $3,269,817 | 0.12% | 172,277 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension | $3,265,452 | 0.12% | 172,047 | Shares | 2026-08-24 | |
| Large Tidal Investments LLC | $3,147,605 | 0.11% | 165,838 | Shares | 2026-08-13 | |
| Large SEI INVESTMENTS CO | $3,142,195 | 0.11% | 165,553 | Shares | 2026-08-14 |
Key facts
CIK
1595974
CUSIP
55955D100
13F (30d)
245 filings
243 filers
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