Mariner
MKTX icon

Mariner’s MarketAxess Holdings MKTX Stock Holding History

Mariner’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 		$13.1M Buy
79,144
+19,884
+34% +$3.48M 0.02% 635
2025
Q4 		$10.7M Buy
59,260
+46,940
+381% +$8.01M 0.01% 677
2025
Q3 		$2.15M Buy
12,320
+1,330
+12% +$260K ﹤0.01% 1382
2025
Q2 		$2.45M Buy
10,990
+6,581
+149% +$1.45M ﹤0.01% 1218
2025
Q1 		$954K Buy
4,409
+1,468
+50% +$308K ﹤0.01% 1719
2024
Q4 		$665K Buy
2,941
+206
+8% +$54.2K ﹤0.01% 1951
2024
Q3 		$701K Buy
2,735
+279
+11% +$65.4K ﹤0.01% 1878
2024
Q2 		$493K Sell
2,456
-590
-19% -$122K ﹤0.01% 2061
2024
Q1 		$668K Sell
3,046
-481
-14% -$114K ﹤0.01% 1815
2023
Q4 		$1.03M Buy
3,527
+241
+7% +$58.3K ﹤0.01% 1411
2023
Q3 		$702K Sell
3,286
-742
-18% -$180K ﹤0.01% 1546
2023
Q2 		$1.05M Sell
4,028
-144
-3% -$43K ﹤0.01% 1276
2023
Q1 		$1.63M Buy
4,172
+75
+2% +$26.6K ﹤0.01% 1046
2022
Q4 		$1.14M Buy
4,097
+1,841
+82% +$474K ﹤0.01% 1168
2022
Q3 		$502K Buy
+2,256
New +$579K ﹤0.01% 1417
2019
Q3 		– Sell
-1,757
Closed -$565K – 914
2019
Q2 		$565K Sell
1,757
-562
-24% -$162K 0.01% 685
2019
Q1 		$571K Buy
+2,319
New +$525K 0.01% 626

Other funds holding MKTX

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
AQR Capital Management
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
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $133B AUM 72.99% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Mariner's MKTX Position: Q1 2026 in Review

Mariner increased its MarketAxess Holdings (MKTX) stake by 34% in Q1 2026, buying an estimated $3.48M and bringing the position to 79,144 shares worth $13.1M. The position accounts for 0.02% of the portfolio, ranked #635.

Mariner first reported a position in MKTX in Q1 2019 and has held it in 17 quarters since. 447 funds tracked by Wall St. Rank hold MKTX as of Q1 2026.

  • Mariner held 79,144 shares of MarketAxess Holdings worth $13.1M as of Q1 2026.
  • Mariner bought 19,884 MarketAxess Holdings shares in Q1 2026, an estimated $3.48M.
  • MarketAxess Holdings made up 0.02% of Mariner's portfolio in Q1 2026, its #635 holding.
  • Mariner first reported a position in MarketAxess Holdings in Q1 2019 and has held it in 17 quarters since.
  • 447 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.