Twin Tree Management’s MarketAxess Holdings MKTX Stock Holding History

Twin Tree Management’s Portfolio MKTX Stock Details MKTX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$99K	Buy	+600	New	+$105K	﹤0.01%	1159
2025 Q4	–	Sell	-24,700	Closed	-$4.3M	–	1609
2025 Q3	$4.3M	Sell	24,700 -37,200	-60%	-$7.28M	0.02%	794
2025 Q2	$13.8M	Buy	+61,900	New	+$13.6M	0.03%	636
2022 Q1	–	Sell	-9,300	Closed	-$3.83M	–	1791
2021 Q4	$3.83M	Sell	9,300 -26,300	-74%	-$10.4M	0.01%	924
2021 Q3	$15M	Buy	35,600 +11,200	+46%	+$5.14M	0.03%	459
2021 Q2	$11.3M	Buy	24,400 +22,900	+1,527%	+$10.9M	0.03%	475
2021 Q1	$747K	Buy	+1,500	New	+$800K	﹤0.01%	1013

Other funds holding MKTX

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

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

NRCM

North Reef Capital Management Laguna Beach, California $2.91B AUM 11.03% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VanEck Associates New York $133B AUM 72.99% 1-Year Est. Return

Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Twin Tree Management's MKTX Position: Q1 2026 in Review

Twin Tree Management increased its MarketAxess Holdings (MKTX) stake by 140% in Q1 2026, buying an estimated $302K and bringing the position to 2,949 shares worth $487K. The position accounts for 0.01% of the portfolio, ranked #936.

Twin Tree Management first reported a position in MKTX in Q3 2016 and has held it in 14 quarters since. The position peaked at $2.13M in Q1 2020. 447 funds tracked by Wall St. Rank hold MKTX as of Q1 2026.

Twin Tree Management held 2,949 shares of MarketAxess Holdings worth $487K as of Q1 2026.
Twin Tree Management bought 1,722 MarketAxess Holdings shares in Q1 2026, an estimated $302K.
MarketAxess Holdings made up 0.01% of Twin Tree Management's portfolio in Q1 2026, its #936 holding.
Twin Tree Management first reported a position in MarketAxess Holdings in Q3 2016 and has held it in 14 quarters since.
Twin Tree Management's MarketAxess Holdings position peaked at $2.13M in Q1 2020.
447 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q1 2026.

Based on Twin Tree Management's 13F filing for Q1 2026, filed 14 May 2026.