XT
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XTX Topco’s Magnite MGNI Stock Holding History

XTX Topco’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 		$939K Sell
49,488
-97,103
-66% -$1.39M 0.01% 1848
2026
Q1 		$1.74M Buy
146,591
+99,928
+214% +$1.34M 0.03% 944
2025
Q4 		$757K Sell
46,663
-34,782
-43% -$577K 0.02% 1247
2025
Q3 		$1.77M Buy
+81,445
New +$1.92M 0.09% 252
2025
Q2 		– Sell
-135,118
Closed -$1.54M – 2853
2025
Q1 		$1.54M Buy
+135,118
New +$2.15M 0.08% 348
2024
Q4 		– Sell
-15,889
Closed -$220K – 2688
2024
Q3 		$220K Buy
+15,889
New +$216K 0.02% 1385
2022
Q4 		– Sell
-34,413
Closed -$226K – 1352
2022
Q3 		$226K Buy
+34,413
New +$277K 0.06% 706
2021
Q3 		– Sell
-8,005
Closed -$271K – 914
2021
Q2 		$271K Buy
+8,005
New +$271K 0.09% 424

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

XTX Topco's MGNI Position: Q2 2026 in Review

XTX Topco reduced its Magnite (MGNI) stake by 66% in Q2 2026, selling an estimated $1.39M and leaving 49,488 shares worth $939K. The position accounts for 0.01% of the portfolio, ranked #1848.

XTX Topco first reported a position in MGNI in Q2 2021 and has held it in 8 quarters since. The position peaked at $1.77M in Q3 2025. 311 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • XTX Topco held 49,488 shares of Magnite worth $939K as of Q2 2026.
  • XTX Topco sold 97,103 Magnite shares in Q2 2026, an estimated $1.39M.
  • Magnite made up 0.01% of XTX Topco's portfolio in Q2 2026, its #1848 holding.
  • XTX Topco first reported a position in Magnite in Q2 2021 and has held it in 8 quarters since.
  • XTX Topco's Magnite position peaked at $1.77M in Q3 2025.
  • 311 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.