IMC Chicago’s Magnite MGNI Stock Holding History

IMC Chicago’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	$1.48M	Sell	124,700 -251,300	-67%	-$3.37M	﹤0.01%	2870
2025 Q4	$6.1M	Sell	376,000 -40,800	-10%	-$677K	﹤0.01%	1590
2025 Q3	$9.08M	Buy	416,800 +90,900	+28%	+$2.15M	﹤0.01%	1199
2025 Q2	$7.86M	Buy	325,900 +196,400	+152%	+$2.89M	﹤0.01%	1137
2025 Q1	$1.48M	Sell	129,500 -37,200	-22%	-$593K	﹤0.01%	2002
2024 Q4	$2.65M	Sell	166,700 -1,900	-1%	-$27.9K	﹤0.01%	1661
2024 Q3	$2.34M	Buy	168,600 +1,900	+1%	+$25.9K	﹤0.01%	1576
2024 Q2	$2.22M	Buy	166,700 +108,500	+186%	+$1.19M	﹤0.01%	1493
2024 Q1	$626K	Buy	58,200 +9,600	+20%	+$95.9K	﹤0.01%	1947
2023 Q4	$454K	Sell	48,600 -300	-0.6%	-$2.37K	﹤0.01%	1659
2023 Q3	$369K	Buy	+48,900	New	+$527K	﹤0.01%	1488

Other funds holding MGNI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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 Los Angeles, California $645B AUM 30.41% 1-Year Est. Return

Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

IMC Chicago's MGNI Position: Q1 2026 in Review

IMC Chicago reduced its Magnite (MGNI) stake by 79% in Q1 2026, selling an estimated $1.41M and leaving 27,774 shares worth $330K. The position accounts for ﹤0.01% of the portfolio, ranked #4479.

IMC Chicago first reported a position in MGNI in Q3 2023 and has held it in 9 quarters since. The position peaked at $2.16M in Q4 2025. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

IMC Chicago held 27,774 shares of Magnite worth $330K as of Q1 2026.
IMC Chicago sold 105,322 Magnite shares in Q1 2026, an estimated $1.41M.
Magnite made up ﹤0.01% of IMC Chicago's portfolio in Q1 2026, its #4479 holding.
IMC Chicago first reported a position in Magnite in Q3 2023 and has held it in 9 quarters since.
IMC Chicago's Magnite position peaked at $2.16M in Q4 2025.
296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on IMC Chicago's 13F filing for Q1 2026, filed 5 May 2026.