Marex Group’s Magnite MGNI Stock Holding History

Marex Group’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
2025 Q3	–	Sell	-9,402	Closed	-$227K	–	955
2025 Q2	$227K	Buy	+9,402	New	+$139K	﹤0.01%	507
2023 Q3	–	Sell	-11,936	Closed	-$163K	–	247
2023 Q2	$163K	Buy	11,936 +710	+6%	+$7.9K	0.03%	210
2023 Q1	$104K	Buy	+11,226	New	+$120K	0.01%	246

Other funds holding MGNI

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

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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

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

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

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

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

GIM

Granahan Investment Management Waltham, Massachusetts $2.07B AUM 56.45% 1-Year Est. Return

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

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Marex Group's MGNI Position: Q3 2025 in Review

Marex Group sold out of Magnite (MGNI) in Q3 2025, closing a stake of 9,402 shares — an estimated $227K sold.

Marex Group first reported a position in MGNI in Q1 2023 and held it in 3 quarters. The position peaked at $227K in Q2 2025. 316 funds tracked by Wall St. Rank hold MGNI as of Q3 2025.

Marex Group reported no remaining Magnite position as of Q3 2025 after selling out during the quarter.
Marex Group sold 9,402 Magnite shares in Q3 2025, an estimated $227K.
Marex Group first reported a position in Magnite in Q1 2023 and held it in 3 quarters.
Marex Group's Magnite position peaked at $227K in Q2 2025.
316 funds tracked by Wall St. Rank held Magnite as of Q3 2025.

Based on Marex Group's 13F filing for Q3 2025, filed 14 Nov 2025.