William Blair Investment Management’s Marex Group Limited Ordinary Shares MRX Stock Holding History

William Blair Investment Management’s Portfolio MRX Stock Details MRX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$61.5M	Sell	1,009,199 -556,982	-36%	-$30.7M	0.19%	138
2026 Q1	$69.8M	Sell	1,566,181 -172,746	-10%	-$6.82M	0.23%	117
2025 Q4	$66.7M	Buy	1,738,927 +1,370,478	+372%	+$46.6M	0.19%	129
2025 Q3	$12.4M	Sell	368,449 -442,342	-55%	-$16M	0.03%	308
2025 Q2	$32M	Sell	810,791 -865,568	-52%	-$36M	0.08%	194
2025 Q1	$59.2M	Sell	1,676,359 -828,367	-33%	-$28.8M	0.17%	132
2024 Q4	$78.1M	Buy	2,504,726 +1,067,136	+74%	+$29.9M	0.19%	123
2024 Q3	$34M	Sell	1,437,590 -4,172	-0.3%	-$93.1K	0.08%	208
2024 Q2	$28.8M	Buy	+1,441,762	New	+$28.3M	0.08%	228

Other funds holding MRX

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return

AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return

Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return

Loomis, Sayles & Company Boston, Massachusetts $79.8B AUM 16.05% 1-Year Est. Return

Samlyn Capital New York $6.14B AUM 42.05% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

OAM

Ophir Asset Management Sydney, Australia $1.22B AUM 100.03% 1-Year Est. Return

William Blair Investment Management's MRX Position: Q2 2026 in Review

William Blair Investment Management reduced its Marex Group Limited Ordinary Shares (MRX) stake by 36% in Q2 2026, selling an estimated $30.7M and leaving 1,009,199 shares worth $61.5M. The position accounts for 0.19% of the portfolio, ranked #138.

William Blair Investment Management first reported a position in MRX in Q2 2024 and has held it in 9 quarters since. The position peaked at $78.1M in Q4 2024. 220 funds tracked by Wall St. Rank hold MRX as of Q2 2026.

William Blair Investment Management held 1,009,199 shares of Marex Group Limited Ordinary Shares worth $61.5M as of Q2 2026.
William Blair Investment Management sold 556,982 Marex Group Limited Ordinary Shares shares in Q2 2026, an estimated $30.7M.
Marex Group Limited Ordinary Shares made up 0.19% of William Blair Investment Management's portfolio in Q2 2026, its #138 holding.
William Blair Investment Management first reported a position in Marex Group Limited Ordinary Shares in Q2 2024 and has held it in 9 quarters since.
William Blair Investment Management's Marex Group Limited Ordinary Shares position peaked at $78.1M in Q4 2024.
220 funds tracked by Wall St. Rank held Marex Group Limited Ordinary Shares as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.