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Magnite, Inc. 13F holders

311 funds reported a position in Magnite, Inc. in their 13F for the quarter ended 30 June 2026, together 142.5 million shares worth $2.70 billion. Against the quarter before, 42 opened a position, 115 added, 89 trimmed and 37 sold out; together they bought a net 10.1 million shares. The largest holders: BlackRock, Inc., Vanguard Portfolio Management LLC and FMR LLC.

Funds holding311+14 on Q1 2026
Shares they held142.5Mworth $2.70 billion
Net bought on the quarter10.1M sharesabout $191.5 million at the funds' values
Funds buying to selling157 to 126opened or added, to cut or sold
Opened 42Added 115Held 60Trimmed 89Sold out 37
Opened: 42 fundsAdded: 115 fundsHeld: 60 fundsTrimmed: 89 fundsSold out: 37 funds

What each fund did in MGNI against its 13F for the quarter before; a change under 0.1% of a holding counts as held

Q3 2024: 280 funds, 121.0 million shares280Q3 2024Q4 2024: 286 funds, 123.5 million shares286Q4 2024Q1 2025: 293 funds, 133.1 million shares293Q1 2025Q2 2025: 286 funds, 147.0 million shares286Q2 2025Q3 2025: 317 funds, 139.2 million shares317Q3 2025Q4 2025: 304 funds, 136.7 million shares304Q4 2025Q1 2026: 297 funds, 131.6 million shares297Q1 2026Q2 2026: 311 funds, 142.5 million shares311Q2 2026

Funds reporting a position in MGNI in their 13F, each quarter; hover a bar for the shares they held

Filed so far for the quarter to 30 September 2026

2,671 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 54 reported a position in Magnite, Inc.: 10 opened one, 16 added, 14 trimmed and 4 sold out, a net 124,978 shares sold.

FundChange in sharesShares nowStatusFiling
Moran Wealth Management, LLC+183,844183,844new13F
Kopion Asset Management, LLC-155,287519,164trimmed13F
Harbor Capital Advisors, Inc.-99,316213,055trimmed13F
Citizens Financial Group Inc.-54,94227,441trimmed13F
Steinberganna Wealth Management-20,72548,299trimmed13F
Cardinal Point Capital Management ULC-18,47573,675trimmed13F
Cache Advisors, LLC+16,96716,967new13F
Atria Investments, Inc+15,03615,036new13F
OpenArc Corporate Advisory, LLC+13,02513,025new13F
Wealth Enhancement Advisory Services, LLC+10,09424,255added13F
Legacy Advisors, LLC-9,96710,000trimmed13F
FNY Investment Advisers, LLC+9,6459,645new13F
Penbrook Management LLC-6,350105,690trimmed13F
State of Alaska, Department of Revenue+5,87236,206added13F
Moody National Bank Trust Division-4,60092,602trimmed13F
Sterling Capital Management LLC+2,4693,977added13F
Reyes Financial Architecture, Inc.+2,1282,128new13F
Fulton Bank, N.A.-1,38131,660trimmed13F
Blue Trust, Inc.+1,05330,691added13F
Central Pacific Bank - Trust Division-1,0004,000trimmed13F
Versant Capital Management, Inc+9475,662added13F
SJS Investment Consulting Inc.+864972added13F
Pinnacle Associates Ltd+82568,742added13F
Gamma Investing LLC+7082,916added13F
Signaturefd, LLC+4521,715added13F

The largest moves in the name among the funds that have filed, against each fund's previous 13F.

The well-known funds

Of the 44 funds followed here, 7 reported a position in Magnite, Inc. in a 13F for the quarter ended 30 June 2026. The largest: FMR LLC, 7.8 million shares worth $147.3 million, 0.0% of its reported book. New this quarter: Alyeska. In the quarter, 3 funds added or opened a position and 4 trimmed or sold out; together they bought a net 1.3 million shares, about $24.0 million at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.

FundSharesValueOf its bookChange on the quarterStatusQuarter endedFiling
FMR LLC7,759,426$147.3 million0.0%+3,252,007added30 June 202613F
Capital Research Global Investors3,869,159$73.4 million0.0%-1,151,130trimmed30 June 202613F
Geode Capital Management3,789,959$71.9 million0.0%+236,169added30 June 202613F
Millennium Management764,819$14.5 million0.0%-469,638trimmed30 June 202613F
Citadel Advisors472,865$9.0 million0.0%-580,043trimmed30 June 202613F
Alyeska326,839$6.2 million0.0%+326,839new30 June 202613F
Two Sigma Investments42,659$809,6680.0%-352,197trimmed30 June 202613F
Value is what the fund reported.
Read moreChange is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.

The largest holders

FundSharesShare of allValueOf its bookChange in sharesFiling
BlackRock, Inc.12,713,1568.92%$241.3 million0.00%+1,055,66013F
Vanguard Portfolio Management LLC8,197,2865.75%$155.6 million0.01%+471,08113F
FMR LLC7,759,4265.44%$147.3 million0.01%+3,252,00713F
Vanguard Capital Management LLC6,225,1954.37%$118.2 million0.00%+34,79213F
Wellington Management Group LLP6,044,4924.24%$114.7 million0.02%-3,146,58513F
Dimensional Fund Advisors LP5,260,1323.69%$99.8 million0.02%+1,276,45813F
Boston Partners5,013,8353.52%$95.9 million0.09%+293,97213F
American Century Companies Inc.4,622,7363.24%$87.7 million0.04%-4,08013F
Capital Research Global Investors3,869,1592.71%$73.4 million0.01%-1,151,13013F
Nuveen, LLC3,794,8112.66%$72.0 million0.02%+204,78613F
Geode Capital Management, LLC3,789,9592.66%$71.9 million0.00%+236,16913F
Edenbrook Capital, LLC3,555,6152.49%$67.5 million23.59%+757,57913F
State Street Corp.3,528,0752.48%$67.0 million0.00%+364,93613F
325 Capital LLC3,412,6942.39%$64.8 million15.44%+1,407,30713F
Nine Ten Capital Management LLC3,261,2832.29%$61.9 million19.26%-220,00013F
Granahan Investment Management, LLC3,083,2112.16%$58.5 million2.08%+529,79813F
Canada Pension Plan Investment Board2,995,0932.10%$56.8 million0.03%+2,949,04113F
Jane Street Group, LLC2,199,1911.54%$41.7 million0.03%+531,03113F
Park West Asset Management LLC2,000,0001.40%$38.0 million2.60%+1,401,62013F
Morgan Stanley1,991,7321.40%$37.8 million0.00%+1,064,91313F
Qube Research & Technologies Ltd1,955,9891.37%$37.1 million0.04%+1,294,93213F
Blue Grotto Capital, LLC1,706,7411.20%$32.4 million2.70%+377,95913F
Kennedy Capital Management LLC1,666,7991.17%$31.6 million0.56%-86,74313F
Northern Trust Corp.1,553,4121.09%$29.5 million0.00%+230,84113F
Royce & Associates LP1,473,3971.03%$28.0 million0.23%+107,90813F
Goldman Sachs Group Inc.1,466,6401.03%$27.8 million0.00%-34,21213F
Ophir Asset Management Pty Ltd1,450,0611.02%$27.5 million2.26%-667,95513F
First Eagle Investment Management, LLC1,341,5760.94%$25.5 million0.02%13F
Victory Capital Management Inc.1,235,3840.87%$23.4 million0.01%-31,13813F
Charles Schwab Investment Management Inc.1,203,1890.84%$22.8 million0.00%+22,75813F
Bank of America Corp.1,181,8320.83%$22.4 million0.00%+56,63613F
Grizzlyrock Capital, LLC1,164,6280.82%$22.1 million15.46%-74,05213F
Bank of New York Mellon Corp1,162,1980.82%$22.1 million0.00%+23,98113F
Maestria Partners LLC1,158,4300.81%$22.0 million7.64%-205,07513F
Meros Investment Management, LP991,3350.70%$18.8 million5.97%-1,01613F
Vanguard Fiduciary Trust Co.989,0920.69%$18.8 million0.00%-7,99013F
Millennium Management LLC764,8190.54%$14.5 million0.01%-469,63813F
QVT Financial LP747,4370.52%$14.2 million0.92%+293,52713F
UBS Group AG746,3500.52%$14.2 million0.00%+296,00113F
Oberweis Asset Management Inc.735,0000.52%$14.0 million0.29%+87,40013F
Silvercrest Asset Management Group LLC707,7490.50%$13.4 million0.09%+91,66513F
Picton Mahoney Asset Management691,4710.49%$13.1 million0.12%+48,39313F
Kopion Asset Management, LLC674,4510.47%$12.8 million8.09%-181,45313F
Balyasny Asset Management L.P.666,5540.47%$12.7 million0.02%-833,88913F
Ameriprise Financial Inc.619,5730.43%$11.8 million0.00%new13F
S Squared Technology, LLC567,8620.40%$10.8 million3.34%+165,00013F
Schonfeld Strategic Advisors LLC562,1950.39%$10.7 million0.06%-1,042,84613F
Nomura Asset Management Co. Ltd553,9000.39%$10.5 million0.02%-40,00013F
Bank of Montreal533,7570.37%$10.1 million0.00%new13F
King Luther Capital Management Corp.503,5810.35%$9.6 million0.04%-27,48513F
The 50 largest of the 311 funds that reported a position in MGNI in their 13F for the quarter ended 30 June 2026, by the value each reported.
Read moreShare of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?

Options the funds reported on MGNI

FundOptionShares under the optionsValue of those sharesQuarter endedFiling
Citadel AdvisorsPuts1,168,300$22.2 million30 June 202613F
Citadel AdvisorsCalls337,900$6.4 million30 June 202613F
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
Read moreThey are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.

Schedule 13D and 13G filed on the name, last twelve months

FiledScheduleWhoHoldingOf the classEvent dateRule or purposeFiling
13 August 202613G/AWellington Management Group LLP and 5 others6.0 million4.2%30 June 2026passive, institutional (13d-1(b))EDGAR
6 August 202613GFMR LLC and 3 others7.8 million5.4%30 June 2026passive, institutional (13d-1(b))EDGAR
14 May 202613G/ACapital Research Global Investors and 1 other5.0 million3.5%31 March 2026passive, institutional (13d-1(b))EDGAR
6 May 202613G/AFMR LLC and 3 others4.5 million3.1%31 March 2026passive, institutional (13d-1(b))EDGAR
30 April 202613GVanguard Capital Management and 1 other7.3 million5.0%31 March 2026passive, institutional (13d-1(b))EDGAR
29 April 202613GVanguard Portfolio Management and 1 other7.8 million5.4%31 March 2026passive, institutional (13d-1(b))EDGAR
27 March 202613G/AThe Vanguard Group and 1 other00.0%13 March 2026passive, institutional (13d-1(b))EDGAR
12 February 202613GCapital Research Global Investors and 1 other12.9 million9.0%31 December 2025passive, institutional (13d-1(b))EDGAR
10 February 202613GWellington Management Group LLP and 7 others8.6 million6.0%31 December 2025passive, institutional (13d-1(b))EDGAR
5 December 202513G/AFMR LLC and 3 others8.1 million5.7%28 November 2025passive, institutional (13d-1(b))EDGAR
13 November 202513G/ACapital Research Global Investors and 1 other7.0 million4.9%30 September 2025passive, institutional (13d-1(b))EDGAR
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
Read moreAmendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13G

Fails to deliver

Settlement dateShares failedPriceFile
30 September 2026100$25.67SEC
28 September 202619,488$23.97SEC
25 September 202614,888$24.07SEC
21 September 20261,100$25.15SEC
18 September 20262,165$25.63SEC
11 September 2026235,687$23.55SEC
2 September 202610,119$22.89SEC
28 August 20262,872$23.36SEC
27 August 202629,296$23.38SEC
24 August 202620,100$23.50SEC
21 August 202618,775$23.35SEC
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
Read moreLargest in the window: 235,687 on 11 September 2026. A fail is an operational fact about settlement, not a position.