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	$340	Sell	3 -2,946	-100%	-$420K	﹤0.01%	1354
2026 Q1	$487K	Buy	2,949 +1,722	+140%	+$302K	0.01%	936
2025 Q4	$222K	Buy	+1,227	New	+$209K	﹤0.01%	1238
2025 Q3	–	Sell	-2,599	Closed	-$508K	–	1701
2025 Q2	$580K	Sell	2,599 -5,332	-67%	-$1.17M	﹤0.01%	1427
2025 Q1	$1.72M	Buy	+7,931	New	+$1.67M	﹤0.01%	1173
2024 Q4	–	Sell	-419	Closed	-$107K	–	1787
2024 Q3	$107K	Buy	+419	New	+$98.2K	﹤0.01%	1373
2024 Q1	–	Sell	-968	Closed	-$283K	–	1482
2023 Q4	$283K	Buy	+968	New	+$234K	﹤0.01%	1238
2023 Q3	–	Sell	-2,511	Closed	-$656K	–	1413
2023 Q2	$656K	Buy	2,511 +930	+59%	+$277K	﹤0.01%	1038
2023 Q1	$619K	Buy	+1,581	New	+$560K	﹤0.01%	1063
2020 Q4	–	Sell	-130	Closed	-$63K	–	1410
2020 Q3	$63K	Sell	130 -252	-66%	-$125K	﹤0.01%	1088
2020 Q2	$191K	Sell	382 -6,023	-94%	-$2.81M	﹤0.01%	1245
2020 Q1	$2.13M	Buy	6,405 +4,016	+168%	+$1.4M	0.01%	698
2019 Q4	$906K	Buy	+2,389	New	+$876K	﹤0.01%	878
2017 Q1	–	Sell	-2,392	Closed	-$351K	–	1155
2016 Q4	$351K	Buy	2,392 +2,221	+1,299%	+$353K	﹤0.01%	933
2016 Q3	$28K	Buy	+171	New	+$27.8K	﹤0.01%	1056

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.