MAGNITE INC (MGNI) Institutional Ownership Changes & 13F Activity

MAGNITE INC (MGNI). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Wellington Management Group Llp, Canada Pension Plan Investment Board, 325 Capital Llc, Park West Asset Management Llc, and Qube Research & Technologies Ltd.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheBuy+6,457+10.0%71,015$1.35MQ2 2026Sep 09, 2026
Parkside Financial Bank & TrustSell-275-2.5%10,538$200.01KQ2 2026Sep 04, 2026
Citadel Advisors LlcSell-580,043-55.1%472,865$8.97MQ2 2026Sep 02, 2026
Cornerstone Financial Management LlcBuy+3434$645.00Q2 2026Aug 28, 2026
Corient Private Wealth LlcBuy+25,32625,326$480.69KQ2 2026Aug 27, 2026
First Eagle U.S. ValueBuy+220,500+49.0%670,788$12.73MQ2 2026Aug 24, 2026
California State Teachers Retirement SystemSell-4,481-2.5%172,047$3.27MQ2 2026Aug 24, 2026
Mercer Global Advisors IncBuy+9,916+53.7%28,374$538.54KQ2 2026Aug 19, 2026
Wellington Management Group LlpSell-3,146,585-34.2%6,044,492$114.72MQ2 2026Aug 14, 2026
Canada Pension Plan Investment BoardBuy+2,949,041+6403.7%2,995,093$56.85MQ2 2026Aug 14, 2026
325 Capital LlcBuy+1,407,307+70.2%3,412,694$64.77MQ2 2026Aug 14, 2026
Park West Asset Management LlcBuy+1,401,620+234.2%2,000,000$37.96MQ2 2026Aug 14, 2026
Qube Research & Technologies LtdBuy+1,294,932+195.9%1,955,989$37.12MQ2 2026Aug 14, 2026
Schonfeld Strategic Advisors LlcSell-1,042,846-65.0%562,195$10.67MQ2 2026Aug 14, 2026
Balyasny Asset Management L.P.Sell-833,889-55.6%666,554$12.65MQ2 2026Aug 14, 2026
Ophir Asset Management Pty LtdSell-667,955-31.5%1,450,061$27.52MQ2 2026Aug 14, 2026
Ameriprise Financial IncBuy+619,573619,573$11.76MQ2 2026Aug 14, 2026
Man Group PlcSell-610,903-92.0%53,054$1.01MQ2 2026Aug 14, 2026
Jane Street Group, LlcBuy+531,031+31.8%2,199,191$41.74MQ2 2026Aug 14, 2026
Granahan Investment Management, LlcBuy+529,798+20.7%3,083,211$58.52MQ2 2026Aug 14, 2026
Millennium Management LlcSell-469,638-38.0%764,819$14.52MQ2 2026Aug 14, 2026
Two Sigma Investments, LpSell-352,197-89.2%42,659$809.67KQ2 2026Aug 14, 2026
Trexquant Investment LpBuy+333,429333,429$6.33MQ2 2026Aug 14, 2026
Alyeska Investment Group, L.P.Buy+326,839326,839$6.20MQ2 2026Aug 14, 2026
Qvt Financial LpBuy+293,527+64.7%747,437$14.19MQ2 2026Aug 14, 2026
Caption Management, LlcSell-259,463-64.1%145,590$2.76MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+222,213222,213$4.22MQ2 2026Aug 14, 2026
Nine Ten Capital Management LlcSell-220,000-6.3%3,261,283$61.90MQ2 2026Aug 14, 2026
Pillsbury Lake Capital LlcBuy+217,753217,753$4.13MQ2 2026Aug 14, 2026
Occam Crest Management LpBuy+195,000195,000$3.85MQ2 2026Aug 14, 2026
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Frequently asked questions about MGNI activity

  • Which institutional owners are buying MGNI?

    Institutional owners buying MGNI include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MGNI activity?

    "Buy" means an investor increased their reported position in MGNI compared to the prior reporting period. This reflects growing exposure to MAGNITE INC (MGNI) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MGNI increasing?

    Institutional interest in MGNI can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.