Portolan Capital Management’s Marex Group Limited Ordinary Shares MRX Stock Holding History

Portolan Capital 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 Q1	–	Sell	-418,745	Closed	-$16.1M	–	185
2025 Q4	$16.1M	Buy	+418,745	New	+$14.2M	0.86%	38
2025 Q3	–	Sell	-83,759	Closed	-$3.31M	–	158
2025 Q2	$3.31M	Sell	83,759 -90,437	-52%	-$3.76M	0.21%	105
2025 Q1	$6.15M	Sell	174,196 -49,418	-22%	-$1.72M	0.47%	65
2024 Q4	$6.97M	Buy	+223,614	New	+$6.26M	0.47%	72

Other funds holding MRX

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

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

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

Loomis, Sayles & Company Boston, Massachusetts $74.3B AUM 24.01% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

Samlyn Capital New York $5.86B AUM 36.3% 1-Year Est. Return

Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return

Jennison Associates New York $145B AUM 34.61% 1-Year Est. Return

William Blair Investment Management Chicago, Illinois $30.3B AUM 33.75% 1-Year Est. Return

AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return

Portolan Capital Management's MRX Position: Q1 2026 in Review

Portolan Capital Management sold out of Marex Group Limited Ordinary Shares (MRX) in Q1 2026, closing a stake of 418,745 shares — an estimated $16.1M sold.

Portolan Capital Management first reported a position in MRX in Q4 2024 and held it in 4 quarters. The position peaked at $16.1M in Q4 2025. 205 funds tracked by Wall St. Rank hold MRX as of Q1 2026.

Portolan Capital Management reported no remaining Marex Group Limited Ordinary Shares position as of Q1 2026 after selling out during the quarter.
Portolan Capital Management sold 418,745 Marex Group Limited Ordinary Shares shares in Q1 2026, an estimated $16.1M.
Portolan Capital Management first reported a position in Marex Group Limited Ordinary Shares in Q4 2024 and held it in 4 quarters.
Portolan Capital Management's Marex Group Limited Ordinary Shares position peaked at $16.1M in Q4 2025.
205 funds tracked by Wall St. Rank held Marex Group Limited Ordinary Shares as of Q1 2026.

Based on Portolan Capital Management's 13F filing for Q1 2026, filed 15 May 2026.