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John Overdeck’s Magnite MGNI Stock Holding History

John Overdeck’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
2022
Q1 		– Sell
-102,400
Closed -$1.79M – 3676
2021
Q4 		$1.79M Buy
102,400
+32,800
+47% +$739K ﹤0.01% 2022
2021
Q3 		$1.95M Buy
69,600
+23,300
+50% +$701K ﹤0.01% 2016
2021
Q2 		$1.57M Buy
46,300
+5,500
+13% +$186K ﹤0.01% 2095
2021
Q1 		$1.7M Buy
+40,800
New +$1.77M ﹤0.01% 1840

Other funds holding MGNI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return

John Overdeck's MGNI Position: Q2 2026 in Review

John Overdeck reduced its Magnite (MGNI) stake by 89% in Q2 2026, selling an estimated $5.05M and leaving 42,659 shares worth $810K. The position accounts for ﹤0.01% of the portfolio, ranked #3774.

John Overdeck first reported a position in MGNI in Q2 2015 and has held it in 41 quarters since. The position peaked at $23.9M in Q3 2021. 309 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • John Overdeck held 42,659 shares of Magnite worth $810K as of Q2 2026.
  • John Overdeck sold 352,197 Magnite shares in Q2 2026, an estimated $5.05M.
  • Magnite made up ﹤0.01% of John Overdeck's portfolio in Q2 2026, its #3774 holding.
  • John Overdeck first reported a position in Magnite in Q2 2015 and has held it in 41 quarters since.
  • John Overdeck's Magnite position peaked at $23.9M in Q3 2021.
  • 309 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.