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GAMCO Investors’s Magnite MGNI Stock Holding History

GAMCO Investors’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 		$1.2M Buy
63,101
+2,448
+4% +$35.1K 0.01% 570
2026
Q1 		$721K Buy
60,653
+16,174
+36% +$217K 0.01% 685
2025
Q4 		$722K Sell
44,479
-11,990
-21% -$199K 0.01% 722
2025
Q3 		$1.23M Sell
56,469
-3,114
-5% -$73.5K 0.01% 609
2025
Q2 		$1.44M Sell
59,583
-19,203
-24% -$283K 0.01% 599
2025
Q1 		$899K Sell
78,786
-5,846
-7% -$93.2K 0.01% 580
2024
Q4 		$1.35M Buy
84,632
+10,799
+15% +$158K 0.01% 551
2024
Q3 		$1.02M Buy
73,833
+29,376
+66% +$400K 0.01% 589
2024
Q2 		$591K Buy
+44,457
New +$486K 0.01% 678

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

GAMCO Investors's MGNI Position: Q2 2026 in Review

GAMCO Investors increased its Magnite (MGNI) stake by 4% in Q2 2026, buying an estimated $35.1K and bringing the position to 63,101 shares worth $1.2M. The position accounts for 0.01% of the portfolio, ranked #570.

GAMCO Investors first reported a position in MGNI in Q2 2024 and has held it in 9 quarters since. The position peaked at $1.44M in Q2 2025. 311 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • GAMCO Investors held 63,101 shares of Magnite worth $1.2M as of Q2 2026.
  • GAMCO Investors bought 2,448 Magnite shares in Q2 2026, an estimated $35.1K.
  • Magnite made up 0.01% of GAMCO Investors's portfolio in Q2 2026, its #570 holding.
  • GAMCO Investors first reported a position in Magnite in Q2 2024 and has held it in 9 quarters since.
  • GAMCO Investors's Magnite position peaked at $1.44M in Q2 2025.
  • 311 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on GAMCO Investors's 13F filing for Q2 2026, filed 12 Aug 2026.