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Polar Asset Management Partners’s Magnite MGNI Stock Holding History

Polar Asset Management Partners’s Portfolio MGNI Stock Details MGNI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-213,866
Closed -$4.66M – 771
2025
Q3 		$4.66M Buy
+213,866
New +$5.05M 0.05% 266
2021
Q4 		– Sell
-176,400
Closed -$4.94M – 1418
2021
Q3 		$4.94M Buy
+176,400
New +$5.31M 0.05% 393
2020
Q3 		– Sell
-878,400
Closed -$5.86M – 674
2020
Q2 		$5.86M Buy
+878,400
New +$5.49M 0.1% 211

Other funds holding MGNI

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Polar Asset Management Partners's MGNI Position: Q4 2025 in Review

Polar Asset Management Partners sold out of Magnite (MGNI) in Q4 2025, closing a stake of 213,866 shares — an estimated $4.66M sold.

Polar Asset Management Partners first reported a position in MGNI in Q2 2020 and held it in 3 quarters. The position peaked at $5.86M in Q2 2020. 304 funds tracked by Wall St. Rank hold MGNI as of Q4 2025.

  • Polar Asset Management Partners reported no remaining Magnite position as of Q4 2025 after selling out during the quarter.
  • Polar Asset Management Partners sold 213,866 Magnite shares in Q4 2025, an estimated $4.66M.
  • Polar Asset Management Partners first reported a position in Magnite in Q2 2020 and held it in 3 quarters.
  • Polar Asset Management Partners's Magnite position peaked at $5.86M in Q2 2020.
  • 304 funds tracked by Wall St. Rank held Magnite as of Q4 2025.

Based on Polar Asset Management Partners's 13F filing for Q4 2025, filed 17 Feb 2026.