PEAK6
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PEAK6’s Magnite MGNI Stock Holding History

PEAK6’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
Q1 		– Sell
-7,500
Closed -$122K – 3061
2025
Q4 		$122K Sell
7,500
-218,300
-97% -$3.62M ﹤0.01% 2488
2025
Q3 		$4.92M Sell
225,800
-108,200
-32% -$2.55M 0.01% 1038
2025
Q2 		$8.06M Buy
+334,000
New +$4.92M 0.01% 728
2025
Q1 		– Sell
-352,500
Closed -$5.61M – 3369
2024
Q4 		$5.61M Buy
+352,500
New +$5.17M 0.01% 841

Other funds holding MGNI

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
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 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

PEAK6's MGNI Position: Q2 2025 in Review

PEAK6 sold out of Magnite (MGNI) in Q2 2025, closing a stake of 103,167 shares — an estimated $1.52M sold.

PEAK6 first reported a position in MGNI in Q1 2025 and held it in 1 quarter. The position peaked at $1.18M in Q1 2025. 286 funds tracked by Wall St. Rank hold MGNI as of Q2 2025.

  • PEAK6 reported no remaining Magnite position as of Q2 2025 after selling out during the quarter.
  • PEAK6 sold 103,167 Magnite shares in Q2 2025, an estimated $1.52M.
  • PEAK6 first reported a position in Magnite in Q1 2025 and held it in 1 quarter.
  • PEAK6's Magnite position peaked at $1.18M in Q1 2025.
  • 286 funds tracked by Wall St. Rank held Magnite as of Q2 2025.

Based on PEAK6's 13F filing for Q2 2025, filed 14 Aug 2025.