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 Q2	$56.7K	Sell	500 -100	-17%	-$14.2K	﹤0.01%	1295
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 $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

NRCM

North Reef Capital Management Laguna Beach, California $2.61B AUM 11.5% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

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

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Twin Tree Management's MKTX Position: Q2 2026 in Review

Twin Tree Management reduced its MarketAxess Holdings (MKTX) stake by 100% in Q2 2026, selling an estimated $420K and leaving 3 shares worth $340. The position accounts for ﹤0.01% of the portfolio, ranked #1354.

Twin Tree Management first reported a position in MKTX in Q3 2016 and has held it in 15 quarters since. The position peaked at $2.13M in Q1 2020. 396 funds tracked by Wall St. Rank hold MKTX as of Q2 2026.

Twin Tree Management held 3 shares of MarketAxess Holdings worth $340 as of Q2 2026.
Twin Tree Management sold 2,946 MarketAxess Holdings shares in Q2 2026, an estimated $420K.
MarketAxess Holdings made up ﹤0.01% of Twin Tree Management's portfolio in Q2 2026, its #1354 holding.
Twin Tree Management first reported a position in MarketAxess Holdings in Q3 2016 and has held it in 15 quarters since.
Twin Tree Management's MarketAxess Holdings position peaked at $2.13M in Q1 2020.
396 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q2 2026.

Based on Twin Tree Management's 13F filing for Q2 2026, filed 12 Aug 2026.