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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
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 $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

GAMCO Investors's MGNI Position: Q1 2026 in Review

GAMCO Investors increased its Magnite (MGNI) stake by 36% in Q1 2026, buying an estimated $217K and bringing the position to 60,653 shares worth $721K. The position accounts for 0.01% of the portfolio, ranked #685.

GAMCO Investors first reported a position in MGNI in Q2 2024 and has held it in 8 quarters since. The position peaked at $1.44M in Q2 2025. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • GAMCO Investors held 60,653 shares of Magnite worth $721K as of Q1 2026.
  • GAMCO Investors bought 16,174 Magnite shares in Q1 2026, an estimated $217K.
  • Magnite made up 0.01% of GAMCO Investors's portfolio in Q1 2026, its #685 holding.
  • GAMCO Investors first reported a position in Magnite in Q2 2024 and has held it in 8 quarters since.
  • GAMCO Investors's Magnite position peaked at $1.44M in Q2 2025.
  • 296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on GAMCO Investors's 13F filing for Q1 2026, filed 14 May 2026.