MAGNITE INC (MGNI) Institutional Shareholders
MAGNITE INC (MGNI) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $2.67B in MGNI holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MGNI tracked by InsiderSet, reporting ownership valued at approximately $241.30M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $325.84M, representing an estimated gain of +35.04% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 45% of the total disclosed MGNI value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Fmr Llc, and several other long-term asset managers with concentrated positions in MAGNITE INC (MGNI).
This page ranks the largest institutional MGNI shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
297
Total Reported Value
$2.67B
Largest Holder
Blackrock, Inc.
Largest Position
$241.30M
Insider Transactions (90d)
43
Latest Filing Quarter
Q2 2026
New Institutional Positions
54
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 12,713,156 | $241,295,708 | $325,838,188 | +$84,542,480 | +35.04% | |
| Vanguard Portfolio Management Llc | 0.01% | 8,197,286 | $155,584,488 | $210,096,440 | +$54,511,952 | +35.04% | |
| Fmr Llc | 0.01% | 7,759,426 | $147,273,902 | $198,874,088 | +$51,600,186 | +35.04% | |
| Vanguard Capital Management Llc | 0.00% | 6,225,195 | $118,154,201 | $159,551,748 | +$41,397,547 | +35.04% | |
| Wellington Management Group Llp | 0.02% | 6,044,492 | $114,724,458 | $154,920,330 | +$40,195,872 | +35.04% | |
| Dimensional Fund Advisors Lp | 0.02% | 5,260,132 | $99,838,708 | $134,817,183 | +$34,978,475 | +35.03% | |
| Boston Partners | 0.09% | 5,013,835 | $95,854,485 | $128,504,591 | +$32,650,106 | +34.06% | |
| American Century Companies Inc | 0.04% | 4,622,736 | $87,739,553 | $118,480,724 | +$30,741,171 | +35.04% | |
| Capital Research Global Investors | 0.01% | 3,869,159 | $73,436,638 | $99,166,545 | +$25,729,907 | +35.04% | |
| Nuveen, Llc | 0.02% | 3,794,811 | $72,025,513 | $97,261,006 | +$25,235,493 | +35.04% | |
| Geode Capital Management, Llc | 0.00% | 3,789,959 | $71,946,545 | $97,136,649 | +$25,190,104 | +35.01% | |
| Edenbrook Capital, Llc | 23.59% | 3,555,615 | $67,485,573 | $91,130,412 | +$23,644,839 | +35.04% | |
| State Street Corp | 0.00% | 3,528,075 | $66,962,864 | $90,424,562 | +$23,461,698 | +35.04% | |
| 325 Capital Llc | 15.44% | 3,412,694 | $64,772,932 | $87,467,347 | +$22,694,415 | +35.04% | |
| Nine Ten Capital Management Llc | 19.26% | 3,261,283 | $61,899,000 | $83,586,683 | +$21,687,683 | +35.04% | |
| Granahan Investment Management, Llc | 2.09% | 3,083,211 | $58,519,345 | $79,022,698 | +$20,503,353 | +35.04% | |
| Canada Pension Plan Investment Board | 0.03% | 2,995,093 | $56,846,865 | $76,764,234 | +$19,917,369 | +35.04% | |
| Jane Street Group, Llc | 0.03% | 2,199,191 | $41,740,645 | $56,365,265 | +$14,624,620 | +35.04% | |
| Park West Asset Management Llc | 2.59% | 2,000,000 | $37,960,000 | $51,260,000 | +$13,300,000 | +35.04% | |
| Morgan Stanley | 0.00% | 1,991,732 | $37,803,076 | $51,048,091 | +$13,245,015 | +35.04% | |
| Qube Research & Technologies Ltd | 0.04% | 1,955,989 | $37,124,671 | $50,131,998 | +$13,007,327 | +35.04% | |
| Blue Grotto Capital, Llc | 2.70% | 1,706,741 | $32,393,945 | $43,743,772 | +$11,349,827 | +35.04% | |
| Kennedy Capital Management Llc | 0.56% | 1,666,799 | $31,635,845 | $42,720,058 | +$11,084,213 | +35.04% | |
| Northern Trust Corp | 0.00% | 1,553,412 | $29,483,760 | $39,813,950 | +$10,330,190 | +35.04% | |
| Royce & Associates Lp | 0.23% | 1,473,397 | $27,965,075 | $37,763,165 | +$9,798,090 | +35.04% | |
| Goldman Sachs Group Inc | 0.00% | 1,466,640 | $27,836,827 | $37,589,983 | +$9,753,156 | +35.04% | |
| Ophir Asset Management Pty Ltd | 2.26% | 1,450,061 | $27,522,158 | $37,165,063 | +$9,642,905 | +35.04% | |
| Victory Capital Management Inc | 0.01% | 1,235,384 | $23,447,589 | $31,662,892 | +$8,215,303 | +35.04% | |
| Charles Schwab Investment Management Inc | 0.00% | 1,203,189 | $22,836,527 | $30,837,734 | +$8,001,207 | +35.04% | |
| Bank Of America Corp | 0.00% | 1,181,832 | $22,431,171 | $30,290,354 | +$7,859,183 | +35.04% | |
| Grizzlyrock Capital, Llc | 15.46% | 1,164,628 | $22,104,639 | $29,849,416 | +$7,744,777 | +35.04% | |
| Bank Of New York Mellon Corp | 0.00% | 1,162,198 | $22,058,518 | $29,787,135 | +$7,728,617 | +35.04% | |
| Maestria Partners Llc | 7.65% | 1,158,430 | $21,987,001 | $29,690,561 | +$7,703,560 | +35.04% | |
| Meros Investment Management, Lp | 5.97% | 991,335 | $18,815,538 | $25,407,916 | +$6,592,378 | +35.04% | |
| Vanguard Fiduciary Trust Co | 0.00% | 989,092 | $18,772,966 | $25,350,428 | +$6,577,462 | +35.04% | |
| Millennium Management Llc | 0.01% | 764,819 | $14,516,265 | $19,602,311 | +$5,086,046 | +35.04% | |
| Qvt Financial Lp | 0.91% | 747,437 | $14,186,354 | $19,156,810 | +$4,970,456 | +35.04% | |
| Ubs Group Ag | 0.00% | 746,350 | $14,165,723 | $19,128,951 | +$4,963,228 | +35.04% | |
| Oberweis Asset Management Inc/ | 0.29% | 735,000 | $13,950,300 | $18,838,050 | +$4,887,750 | +35.04% | |
| Silvercrest Asset Management Group Llc | 0.09% | 707,749 | $13,433,076 | $18,139,607 | +$4,706,531 | +35.04% | |
| Picton Mahoney Asset Management | 0.12% | 691,471 | $13,124,123 | $17,722,402 | +$4,598,279 | +35.04% | |
| Kopion Asset Management, Llc | 8.09% | 674,451 | $12,801,080 | $17,286,179 | +$4,485,099 | +35.04% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.02% | 670,788 | $12,731,556 | $17,192,296 | +$4,460,740 | +35.04% |
| Balyasny Asset Management L.P. | 0.02% | 666,554 | $12,651,195 | $17,083,779 | +$4,432,584 | +35.04% | |
| Ameriprise Financial Inc | 0.00% | 619,573 | $11,759,490 | $15,879,656 | +$4,120,166 | +35.04% | |
| S Squared Technology, Llc | 3.34% | 567,862 | $10,778,021 | $14,554,303 | +$3,776,282 | +35.04% | |
| Schonfeld Strategic Advisors Llc | 0.06% | 562,195 | $10,670,460 | $14,409,058 | +$3,738,598 | +35.04% | |
| Nomura Asset Management Co Ltd | 0.02% | 553,900 | $10,513,022 | $14,196,457 | +$3,683,435 | +35.04% | |
| Bank Of Montreal | 0.00% | 533,757 | $10,130,708 | $13,680,192 | +$3,549,484 | +35.04% | |
| King Luther Capital Management Corp | 0.04% | 503,581 | $9,557,967 | $12,906,781 | +$3,348,814 | +35.04% |
Frequently asked questions about MGNI
Who owns the most MGNI stock?
The largest holders of MGNI are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MAGNITE INC (MGNI).
Is MGNI widely held by superinvestors?
Many widely followed stocks like MGNI appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MGNI is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.