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Caption Management’s Magnite MGNI Stock Holding History

Caption Management’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
2026
Q2 		$28.5M Hold
1,500,000
– – 0.13% 160
2026
Q1 		$17.8M Buy
1,500,000
+1,337,500
+823% +$17.9M 0.1% 208
2025
Q4 		$2.64M Sell
162,500
-237,500
-59% -$3.94M 0.02% 739
2025
Q3 		$8.71M Buy
+400,000
New +$9.45M 0.07% 314
2021
Q2 		– Sell
-10,700
Closed -$444K – 1477
2021
Q1 		$444K Buy
+10,700
New +$464K 0.01% 834

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

Caption Management's MGNI Position: Q2 2026 in Review

Caption Management reduced its Magnite (MGNI) stake by 64% in Q2 2026, selling an estimated $3.72M and leaving 145,590 shares worth $2.76M. The position accounts for 0.01% of the portfolio, ranked #793.

Caption Management first reported a position in MGNI in Q4 2017 and has held it in 14 quarters since. The position peaked at $5.07M in Q4 2018. 310 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • Caption Management held 145,590 shares of Magnite worth $2.76M as of Q2 2026.
  • Caption Management sold 259,463 Magnite shares in Q2 2026, an estimated $3.72M.
  • Magnite made up 0.01% of Caption Management's portfolio in Q2 2026, its #793 holding.
  • Caption Management first reported a position in Magnite in Q4 2017 and has held it in 14 quarters since.
  • Caption Management's Magnite position peaked at $5.07M in Q4 2018.
  • 310 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on Caption Management's 13F filing for Q2 2026, filed 14 Aug 2026.