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CenterBook Partners’s Magnite MGNI Stock Holding History

CenterBook 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
2026
Q2 		$2.23M Sell
117,550
-446,606
-79% -$6.4M 0.11% 209
2026
Q1 		$6.7M Buy
564,156
+391,610
+227% +$5.25M 0.36% 69
2025
Q4 		$2.8M Buy
172,546
+99,760
+137% +$1.66M 0.14% 202
2025
Q3 		$1.59M Sell
72,786
-19,480
-21% -$460K 0.08% 298
2025
Q2 		$2.23M Sell
92,266
-224,738
-71% -$3.31M 0.12% 202
2025
Q1 		$3.62M Sell
317,004
-308,761
-49% -$4.92M 0.23% 120
2024
Q4 		$9.96M Buy
+625,765
New +$9.18M 0.6% 37

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

CenterBook Partners's MGNI Position: Q2 2026 in Review

CenterBook Partners reduced its Magnite (MGNI) stake by 79% in Q2 2026, selling an estimated $6.4M and leaving 117,550 shares worth $2.23M. The position accounts for 0.11% of the portfolio, ranked #209.

CenterBook Partners first reported a position in MGNI in Q4 2024 and has held it in 7 quarters since. The position peaked at $9.96M in Q4 2024. 311 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • CenterBook Partners held 117,550 shares of Magnite worth $2.23M as of Q2 2026.
  • CenterBook Partners sold 446,606 Magnite shares in Q2 2026, an estimated $6.4M.
  • Magnite made up 0.11% of CenterBook Partners's portfolio in Q2 2026, its #209 holding.
  • CenterBook Partners first reported a position in Magnite in Q4 2024 and has held it in 7 quarters since.
  • CenterBook Partners's Magnite position peaked at $9.96M in Q4 2024.
  • 311 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on CenterBook Partners's 13F filing for Q2 2026, filed 11 Aug 2026.