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Penbrook Management’s Magnite MGNI Stock Holding History

Penbrook 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
Q1 		$1.33M Buy
112,190
+81,075
+261% +$1.09M 1.01% 29
2025
Q4 		$505K Buy
31,115
+2,695
+9% +$44.7K 0.35% 58
2025
Q3 		$619K Sell
28,420
-38,170
-57% -$901K 0.43% 51
2025
Q2 		$1.12M Buy
66,590
+28,420
+74% +$419K 0.42% 54
2025
Q1 		$436K Sell
38,170
-310
-0.8% -$4.94K 0.33% 66
2024
Q4 		$613K Buy
38,480
+15,050
+64% +$221K 0.42% 52
2024
Q3 		$325K Buy
+23,430
New +$319K 0.21% 80

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

Penbrook Management's MGNI Position: Q1 2026 in Review

Penbrook Management increased its Magnite (MGNI) stake by 261% in Q1 2026, buying an estimated $1.09M and bringing the position to 112,190 shares worth $1.33M. The position accounts for 1.01% of the portfolio, ranked #29.

Penbrook Management first reported a position in MGNI in Q3 2024 and has held it in 7 quarters since. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Penbrook Management held 112,190 shares of Magnite worth $1.33M as of Q1 2026.
  • Penbrook Management bought 81,075 Magnite shares in Q1 2026, an estimated $1.09M.
  • Magnite made up 1.01% of Penbrook Management's portfolio in Q1 2026, its #29 holding.
  • Penbrook Management first reported a position in Magnite in Q3 2024 and has held it in 7 quarters since.
  • 297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Penbrook Management's 13F filing for Q1 2026, filed 21 Apr 2026.