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Alta Park Capital’s Magnite MGNI Stock Holding History

Alta Park Capital’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
2025
Q4 		– Sell
-255,698
Closed -$5.57M – 40
2025
Q3 		$5.57M Sell
255,698
-157,904
-38% -$3.73M 0.49% 39
2025
Q2 		$9.98M Buy
+413,602
New +$6.09M 1.13% 26
2021
Q4 		– Sell
-514,228
Closed -$14.4M – 32
2021
Q3 		$14.4M Buy
+514,228
New +$15.5M 1.05% 26
2021
Q2 		– Sell
-428,891
Closed -$17.8M – 34
2021
Q1 		$17.8M Sell
428,891
-1,157,942
-73% -$50.2M 1.84% 22
2020
Q4 		$48.7M Buy
+1,586,833
New +$24M 4.11% 8

Other funds holding MGNI

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Alta Park Capital's MGNI Position: Q4 2025 in Review

Alta Park Capital sold out of Magnite (MGNI) in Q4 2025, closing a stake of 255,698 shares — an estimated $5.57M sold.

Alta Park Capital first reported a position in MGNI in Q4 2020 and held it in 5 quarters. The position peaked at $48.7M in Q4 2020. 304 funds tracked by Wall St. Rank hold MGNI as of Q4 2025.

  • Alta Park Capital reported no remaining Magnite position as of Q4 2025 after selling out during the quarter.
  • Alta Park Capital sold 255,698 Magnite shares in Q4 2025, an estimated $5.57M.
  • Alta Park Capital first reported a position in Magnite in Q4 2020 and held it in 5 quarters.
  • Alta Park Capital's Magnite position peaked at $48.7M in Q4 2020.
  • 304 funds tracked by Wall St. Rank held Magnite as of Q4 2025.

Based on Alta Park Capital's 13F filing for Q4 2025, filed 17 Feb 2026.