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Who owns Magnite (MGNI) stock

316 funds reported Magnite (MGNI) shares in their latest 13F filings, worth $2.9B in all. The largest holder is BlackRock ($241M). Last quarter 157 funds added to their stakes and 116 cut them.

Largest holders of MGNI (13F)Largest holders of MGNI (13F)BlackRock$241MVanguard Group$240MVanguard Portfolio Management LLC$156MFMR LLC$147MVanguard Capital Management LLC$118MWellington Management Group LLP$115MDimensional Fund Advisors LP$99.8MBoston Partners$95.9MAmerican Century Companies$87.7MCapital Research Global Investors$73.4M

Largest holders (13F)

FundSharesValueChangeQuarter
BlackRock12,713,156$241Mincrease2026-06-30
Vanguard Group14,802,630$240Mincrease2025-12-31
Vanguard Portfolio Management LLC8,197,286$156Mincrease2026-06-30
FMR LLC7,759,426$147Mincrease2026-06-30
Vanguard Capital Management LLC6,225,195$118Mincrease2026-06-30
Wellington Management Group LLP6,044,492$115Mdecrease2026-06-30
Dimensional Fund Advisors LP5,260,132$99.8Mincrease2026-06-30
Boston Partners5,013,835$95.9Mincrease2026-06-30
American Century Companies4,622,736$87.7Mdecrease2026-06-30
Capital Research Global Investors3,869,159$73.4Mdecrease2026-06-30
Nuveen, LLC3,794,811$72.0Mincrease2026-06-30
Geode Capital Management, LLC3,789,959$71.9Mincrease2026-06-30
Edenbrook Capital, LLC3,555,615$67.5Mincrease2026-06-30
State Street3,528,075$67.0Mincrease2026-06-30
325 Capital LLC3,412,694$64.8Mincrease2026-06-30

Magnite's latest quarter

Magnite, Q3 2026: revenue $204M (+14% year over year), operating margin 24.8%, net earnings $34.0M, operating cash flow $103M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most MGNI stock?

By the latest 13F filings: BlackRock ($241M); Vanguard Group ($240M); Vanguard Portfolio Management LLC ($156M); FMR LLC ($147M); Vanguard Capital Management LLC ($118M).

What is the short interest in MGNI?

10,507,955 shares were sold short at the 2026-10-15 settlement, -3.83% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.