Primecap Management’s MarketAxess Holdings MKTX Stock Holding History

Primecap 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	$398M	Buy	3,504,905 +157,780	+5%	+$22.5M	0.24%	78
2026 Q1	$552M	Buy	3,347,125 +171,700	+5%	+$30.1M	0.43%	53
2025 Q4	$576M	Buy	3,175,425 +944,830	+42%	+$161M	0.44%	53
2025 Q3	$389M	Buy	2,230,595 +891,303	+67%	+$174M	0.3%	67
2025 Q2	$299M	Sell	1,339,292 -22,220	-2%	-$4.88M	0.24%	81
2025 Q1	$295M	Sell	1,361,512 -7,590	-0.6%	-$1.59M	0.24%	82
2024 Q4	$309M	Buy	1,369,102 +30,180	+2%	+$7.94M	0.24%	83
2024 Q3	$343M	Buy	1,338,922 +8,042	+0.6%	+$1.88M	0.25%	80
2024 Q2	$267M	Buy	1,330,880 +204,960	+18%	+$42.3M	0.19%	88
2024 Q1	$247M	Buy	1,125,920 +3,360	+0.3%	+$794K	0.18%	92
2023 Q4	$329M	Buy	1,122,560 +4,340	+0.4%	+$1.05M	0.26%	78
2023 Q3	$239M	Buy	1,118,220 +10,450	+0.9%	+$2.53M	0.2%	86
2023 Q2	$290M	Sell	1,107,770 -1,460	-0.1%	-$436K	0.24%	82
2023 Q1	$434M	Buy	1,109,230 +127,200	+13%	+$45M	0.38%	63
2022 Q4	$274M	Buy	982,030 +18,150	+2%	+$4.67M	0.25%	78
2022 Q3	$214M	Buy	963,880 +156,530	+19%	+$40.2M	0.21%	90
2022 Q2	$207M	Buy	807,350 +257,850	+47%	+$70.5M	0.18%	92
2022 Q1	$187M	Buy	549,500 +85,310	+18%	+$30.9M	0.14%	115
2021 Q4	$191M	Buy	464,190 +15,030	+3%	+$5.93M	0.13%	116
2021 Q3	$189M	Buy	449,160 +23,100	+5%	+$10.6M	0.13%	117
2021 Q2	$198M	Buy	426,060 +52,840	+14%	+$25.2M	0.13%	120
2021 Q1	$186M	Sell	373,220 -12,400	-3%	-$6.61M	0.13%	119
2020 Q4	$220M	Sell	385,620 -48,700	-11%	-$26.5M	0.16%	109
2020 Q3	$209M	Sell	434,320 -78,900	-15%	-$39M	0.17%	106
2020 Q2	$257M	Sell	513,220 -86,900	-14%	-$40.5M	0.22%	93
2020 Q1	$200M	Sell	600,120 -89,100	-13%	-$31M	0.2%	97
2019 Q4	$261M	Hold	689,220	–	–	0.19%	103
2019 Q3	$226M	Sell	689,220 -16,100	-2%	-$5.76M	0.18%	105
2019 Q2	$227M	Sell	705,320 -18,900	-3%	-$5.46M	0.17%	114
2019 Q1	$178M	Sell	724,220 -56,000	-7%	-$12.7M	0.13%	123
2018 Q4	$165M	Sell	780,220 -54,200	-6%	-$11.2M	0.13%	118
2018 Q3	$149M	Hold	834,420	–	–	0.1%	130
2018 Q2	$165M	Hold	834,420	–	–	0.12%	123
2018 Q1	$181M	Sell	834,420 -25,000	-3%	-$5.14M	0.14%	117
2017 Q4	$173M	Sell	859,420 -52,500	-6%	-$9.91M	0.13%	119
2017 Q3	$168M	Sell	911,920 -47,800	-5%	-$9.14M	0.14%	121
2017 Q2	$193M	Hold	959,720	–	–	0.17%	110
2017 Q1	$180M	Hold	959,720	–	–	0.16%	109
2016 Q4	$141M	Sell	959,720 -43,700	-4%	-$6.94M	0.14%	114
2016 Q3	$166M	Hold	1,003,420	–	–	0.17%	107
2016 Q2	$146M	Hold	1,003,420	–	–	0.16%	107
2016 Q1	$125M	Hold	1,003,420	–	–	0.13%	115
2015 Q4	$112M	Hold	1,003,420	–	–	0.11%	120
2015 Q3	$93.2M	Hold	1,003,420	–	–	0.1%	132
2015 Q2	$93.1M	Hold	1,003,420	–	–	0.09%	138
2015 Q1	$83.2M	Hold	1,003,420	–	–	0.08%	146
2014 Q4	$72M	Buy	1,003,420 +128,088	+15%	+$8.43M	0.07%	149
2014 Q3	$54.1M	Buy	875,332 +175,812	+25%	+$9.91M	0.06%	160
2014 Q2	$37.8M	Sell	699,520 -5,400	-0.8%	-$295K	0.04%	170
2014 Q1	$41.7M	Hold	704,920	–	–	0.05%	164
2013 Q4	$47.2M	Hold	704,920	–	–	0.06%	161
2013 Q3	$42.3M	Hold	704,920	–	–	0.06%	158
2013 Q2	$33M	Buy	+704,920	New	+$30.3M	0.05%	159

Other funds holding MKTX

BlackRock New York $6.73T AUM 46.02% 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

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

Primecap Management's MKTX Position: Q2 2026 in Review

Primecap Management increased its MarketAxess Holdings (MKTX) stake by 4.7% in Q2 2026, buying an estimated $22.5M and bringing the position to 3,504,905 shares worth $398M. The position accounts for 0.24% of the portfolio, ranked #78.

Primecap Management first reported a position in MKTX in Q2 2013 and has held it in 53 quarters since. The position peaked at $576M in Q4 2025. 393 funds tracked by Wall St. Rank hold MKTX as of Q2 2026.

Primecap Management held 3,504,905 shares of MarketAxess Holdings worth $398M as of Q2 2026.
Primecap Management bought 157,780 MarketAxess Holdings shares in Q2 2026, an estimated $22.5M.
MarketAxess Holdings made up 0.24% of Primecap Management's portfolio in Q2 2026, its #78 holding.
Primecap Management first reported a position in MarketAxess Holdings in Q2 2013 and has held it in 53 quarters since.
Primecap Management's MarketAxess Holdings position peaked at $576M in Q4 2025.
393 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q2 2026.

Based on Primecap Management's 13F filing for Q2 2026, filed 14 Aug 2026.