Citadel Advisors’s MarketAxess Holdings MKTX Stock Holding History

Citadel Advisors’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	$3.46M	Sell	21,000 -16,100	-43%	-$2.82M	﹤0.01%	4980
2025 Q4	$6.72M	Buy	37,100 +10,000	+37%	+$1.71M	﹤0.01%	3834
2025 Q3	$4.72M	Buy	27,100 +22,000	+431%	+$4.3M	﹤0.01%	4463
2025 Q2	$1.14M	Sell	5,100 -17,500	-77%	-$3.85M	﹤0.01%	6793
2025 Q1	$4.89M	Buy	22,600 +5,700	+34%	+$1.2M	﹤0.01%	3910
2024 Q4	$3.82M	Buy	16,900 +1,600	+10%	+$421K	﹤0.01%	4414
2024 Q3	$3.92M	Sell	15,300 -16,300	-52%	-$3.82M	﹤0.01%	4345
2024 Q2	$6.34M	Buy	31,600 +400	+1%	+$82.5K	﹤0.01%	3392
2024 Q1	$6.84M	Sell	31,200 -800	-3%	-$189K	﹤0.01%	3480
2023 Q4	$9.37M	Sell	32,000 -32,000	-50%	-$7.74M	﹤0.01%	2937
2023 Q3	$13.7M	Buy	64,000 +49,000	+327%	+$11.9M	﹤0.01%	2304
2023 Q2	$3.92M	Sell	15,000 -7,300	-33%	-$2.18M	﹤0.01%	4023
2023 Q1	$8.73M	Sell	22,300 -2,000	-8%	-$708K	﹤0.01%	2985
2022 Q4	$6.78M	Sell	24,300 -31,800	-57%	-$8.18M	﹤0.01%	3384
2022 Q3	$12.5M	Buy	56,100 +25,200	+82%	+$6.47M	﹤0.01%	2445
2022 Q2	$7.91M	Sell	30,900 -35,100	-53%	-$9.6M	﹤0.01%	2990
2022 Q1	$22.5M	Buy	66,000 +25,200	+62%	+$9.13M	﹤0.01%	1849
2021 Q4	$16.8M	Sell	40,800 -7,800	-16%	-$3.08M	﹤0.01%	2249
2021 Q3	$20.4M	Buy	48,600 +31,100	+178%	+$14.3M	﹤0.01%	1960
2021 Q2	$8.11M	Sell	17,500 -1,700	-9%	-$809K	﹤0.01%	3448
2021 Q1	$9.56M	Buy	19,200 +7,600	+66%	+$4.05M	﹤0.01%	3028
2020 Q4	$6.62M	Sell	11,600 -7,700	-40%	-$4.19M	﹤0.01%	3211
2020 Q3	$9.29M	Buy	19,300 +10,500	+119%	+$5.19M	﹤0.01%	2379
2020 Q2	$4.41M	Sell	8,800 -37,500	-81%	-$17.5M	﹤0.01%	3257
2020 Q1	$15.4M	Sell	46,300 -64,400	-58%	-$22.4M	0.01%	1452
2019 Q4	$42M	Sell	110,700 -34,800	-24%	-$12.8M	0.02%	879
2019 Q3	$47.7M	Buy	145,500 +63,000	+76%	+$22.5M	0.02%	787
2019 Q2	$26.5M	Buy	82,500 +75,000	+1,000%	+$21.7M	0.01%	1167
2019 Q1	$1.85M	Buy	7,500 +1,300	+21%	+$294K	﹤0.01%	4594
2018 Q4	$1.31M	Sell	6,200 -1,800	-23%	-$373K	﹤0.01%	4868
2018 Q3	$1.43M	Buy	8,000 +1,400	+21%	+$269K	﹤0.01%	4940
2018 Q2	$1.31M	Sell	6,600 -12,100	-65%	-$2.51M	﹤0.01%	4769
2018 Q1	$4.07M	Buy	18,700 +7,400	+65%	+$1.52M	﹤0.01%	2692
2017 Q4	$2.28M	Buy	11,300 +400	+4%	+$75.5K	﹤0.01%	3454
2017 Q3	$2.01M	Sell	10,900 -5,500	-34%	-$1.05M	﹤0.01%	3403
2017 Q2	$3.3M	Buy	16,400 +12,700	+343%	+$2.43M	﹤0.01%	2563
2017 Q1	$694K	Buy	3,700 +500	+16%	+$90.6K	﹤0.01%	4516
2016 Q4	$470K	Sell	3,200 -2,100	-40%	-$334K	﹤0.01%	4998
2016 Q3	$878K	Buy	5,300 +3,400	+179%	+$552K	﹤0.01%	4013
2016 Q2	$276K	Sell	1,900 -6,900	-78%	-$917K	﹤0.01%	5346
2016 Q1	$1.1M	Buy	8,800 +6,300	+252%	+$719K	﹤0.01%	3369
2015 Q4	$279K	Sell	2,500 -6,200	-71%	-$634K	﹤0.01%	5323
2015 Q3	$808K	Buy	8,700 +1,900	+28%	+$184K	﹤0.01%	4110
2015 Q2	$631K	Buy	6,800 +3,400	+100%	+$300K	﹤0.01%	4617
2015 Q1	$282K	Buy	3,400 +1,800	+113%	+$143K	﹤0.01%	5741
2014 Q4	$115K	Sell	1,600 -1,700	-52%	-$112K	﹤0.01%	6526
2014 Q3	$204K	Buy	3,300 +200	+6%	+$11.3K	﹤0.01%	5705
2014 Q2	$168K	Buy	+3,100	New	+$169K	﹤0.01%	5749

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

Citadel Advisors's MKTX Position: Q1 2026 in Review

Citadel Advisors reduced its MarketAxess Holdings (MKTX) stake by 87% in Q1 2026, selling an estimated $95.1M and leaving 82,159 shares worth $13.6M. The position accounts for ﹤0.01% of the portfolio, ranked #2817.

Citadel Advisors first reported a position in MKTX in Q2 2013 and has held it in 51 quarters since. The position peaked at $124M in Q2 2022. 448 funds tracked by Wall St. Rank hold MKTX as of Q1 2026.

Citadel Advisors held 82,159 shares of MarketAxess Holdings worth $13.6M as of Q1 2026.
Citadel Advisors sold 543,049 MarketAxess Holdings shares in Q1 2026, an estimated $95.1M.
MarketAxess Holdings made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #2817 holding.
Citadel Advisors first reported a position in MarketAxess Holdings in Q2 2013 and has held it in 51 quarters since.
Citadel Advisors's MarketAxess Holdings position peaked at $124M in Q2 2022.
448 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.