AlphaQuest’s Magnite MGNI Stock Holding History

AlphaQuest’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	–	Sell	-19,153	Closed	-$311K	–	1224
2025 Q4	$311K	Buy	19,153 +5,662	+42%	+$94K	0.02%	1188
2025 Q3	$294K	Buy	13,491 +1,044	+8%	+$24.7K	0.02%	1166
2025 Q2	$300K	Sell	12,447 -6,630	-35%	-$97.7K	0.03%	877
2025 Q1	$218K	Buy	19,077 +9,073	+91%	+$145K	0.02%	940
2024 Q4	$159K	Sell	10,004 -6,804	-40%	-$99.8K	0.02%	947
2024 Q3	$233K	Buy	+16,808	New	+$229K	0.02%	1009
2024 Q2	–	Sell	-1	Closed	-$11	–	1770
2024 Q1	$11	Buy	+1	New	+$10	﹤0.01%	1629

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

AlphaQuest's MGNI Position: Q1 2026 in Review

AlphaQuest sold out of Magnite (MGNI) in Q1 2026, closing a stake of 19,153 shares — an estimated $311K sold.

AlphaQuest first reported a position in MGNI in Q1 2024 and held it in 7 quarters. The position peaked at $311K in Q4 2025. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

AlphaQuest reported no remaining Magnite position as of Q1 2026 after selling out during the quarter.
AlphaQuest sold 19,153 Magnite shares in Q1 2026, an estimated $311K.
AlphaQuest first reported a position in Magnite in Q1 2024 and held it in 7 quarters.
AlphaQuest's Magnite position peaked at $311K in Q4 2025.
296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on AlphaQuest's 13F filing for Q1 2026.