Brown Brothers Harriman & Co’s MarketAxess Holdings MKTX Stock Holding History

Brown Brothers Harriman & Co’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
2025 Q4	–	Sell	-8	Closed	-$1.39K	–	1917
2025 Q3	$1.39K	Sell	8 -8	-50%	-$1.56K	﹤0.01%	1607
2025 Q2	$3.57K	Buy	16 +6	+60%	+$1.32K	﹤0.01%	1321
2025 Q1	$2.16K	Buy	+10	New	+$2.1K	﹤0.01%	1230
2022 Q4	–	Sell	-6	Closed	-$1K	–	1407
2022 Q3	$1K	Buy	+6	New	+$1.54K	﹤0.01%	1474
2022 Q1	–	Sell	-3	Closed	-$1K	–	1288
2021 Q4	$1K	Sell	3 -19	-86%	-$7.5K	﹤0.01%	1128
2021 Q3	$9K	Buy	22 +19	+633%	+$8.72K	﹤0.01%	921
2021 Q2	$1K	Hold	3	–	–	﹤0.01%	1119
2021 Q1	$1K	Buy	+3	New	+$1.6K	﹤0.01%	1067
2020 Q2	–	Sell	-8	Closed	-$3K	–	1109
2020 Q1	$3K	Sell	8 -7	-47%	-$2.44K	﹤0.01%	876
2019 Q4	$6K	Sell	15 -3	-17%	-$1.1K	﹤0.01%	959
2019 Q3	$6K	Hold	18	–	–	﹤0.01%	961
2019 Q2	$6K	Sell	18 -62	-78%	-$17.9K	﹤0.01%	871
2019 Q1	$20K	Hold	80	–	–	﹤0.01%	730
2018 Q4	$17K	Buy	+80	New	+$16.6K	﹤0.01%	642

Other funds holding MKTX

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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

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

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

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

NRCM

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

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

VanEck Associates New York $164B AUM 112.45% 1-Year Est. Return

GAM

GuardCap Asset Management London, United Kingdom $1.41B AUM 8.17% 1-Year Est. Return

Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return

Brown Brothers Harriman & Co's MKTX Position: Q4 2025 in Review

Brown Brothers Harriman & Co sold out of MarketAxess Holdings (MKTX) in Q4 2025, closing a stake of 8 shares — an estimated $1.39K sold.

Brown Brothers Harriman & Co first reported a position in MKTX in Q4 2018 and held it in 14 quarters. The position peaked at $20K in Q1 2019. 487 funds tracked by Wall St. Rank hold MKTX as of Q4 2025.

Brown Brothers Harriman & Co reported no remaining MarketAxess Holdings position as of Q4 2025 after selling out during the quarter.
Brown Brothers Harriman & Co sold 8 MarketAxess Holdings shares in Q4 2025, an estimated $1.39K.
Brown Brothers Harriman & Co first reported a position in MarketAxess Holdings in Q4 2018 and held it in 14 quarters.
Brown Brothers Harriman & Co's MarketAxess Holdings position peaked at $20K in Q1 2019.
487 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q4 2025.

Based on Brown Brothers Harriman & Co's 13F filing for Q4 2025, filed 12 Feb 2026.