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John Overdeck’s MarketAxess Holdings MKTX Stock Holding History

John Overdeck’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 		$61.7M Buy
543,890
+19,866
+4% +$2.83M 0.04% 473
2026
Q1 		$86.5M Sell
524,024
-9,503
-2% -$1.66M 0.07% 315
2025
Q4 		$96.7M Buy
533,527
+169,143
+46% +$28.9M 0.14% 185
2025
Q3 		$63.5M Buy
364,384
+84,295
+30% +$16.5M 0.09% 274
2025
Q2 		$62.6M Sell
280,089
-150,433
-35% -$33.1M 0.11% 232
2025
Q1 		$93.1M Buy
430,522
+142,203
+49% +$29.9M 0.2% 120
2024
Q4 		$65.2M Buy
288,319
+51,396
+22% +$13.5M 0.14% 171
2024
Q3 		$60.7M Buy
236,923
+33,577
+17% +$7.87M 0.13% 187
2024
Q2 		$40.8M Buy
203,346
+170,032
+510% +$35.1M 0.09% 251
2024
Q1 		$7.3M Sell
33,314
-1,024
-3% -$242K 0.02% 782
2023
Q4 		$10.1M Sell
34,338
-201,945
-85% -$48.8M 0.02% 676
2023
Q3 		$50.5M Buy
236,283
+192,823
+444% +$46.7M 0.14% 200
2023
Q2 		$11.4M Buy
+43,460
New +$13M 0.03% 587
2023
Q1 		– Sell
-2,888
Closed -$805K – 3106
2022
Q4 		$805K Sell
2,888
-157,921
-98% -$40.6M ﹤0.01% 1811
2022
Q3 		$35.8M Buy
160,809
+58,558
+57% +$15M 0.12% 211
2022
Q2 		$26.2M Buy
102,251
+90,563
+775% +$24.8M 0.09% 266
2022
Q1 		$3.98M Buy
+11,688
New +$4.24M 0.01% 1024
2020
Q4 		– Sell
-28,188
Closed -$15.4M – 3594
2020
Q3 		$13.6M Buy
+28,188
New +$13.9M 0.05% 411
2013
Q3 		– Sell
-19,950
Closed -$932K – 1999
2013
Q2 		$932K Buy
+19,950
New +$857K 0.01% 1156

Other funds holding MKTX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
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
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

John Overdeck's MKTX Position: Q2 2026 in Review

John Overdeck increased its MarketAxess Holdings (MKTX) stake by 3.8% in Q2 2026, buying an estimated $2.83M and bringing the position to 543,890 shares worth $61.7M. The position accounts for 0.04% of the portfolio, ranked #473.

John Overdeck first reported a position in MKTX in Q2 2013 and has held it in 19 quarters since. The position peaked at $96.7M in Q4 2025. 392 funds tracked by Wall St. Rank hold MKTX as of Q2 2026.

  • John Overdeck held 543,890 shares of MarketAxess Holdings worth $61.7M as of Q2 2026.
  • John Overdeck bought 19,866 MarketAxess Holdings shares in Q2 2026, an estimated $2.83M.
  • MarketAxess Holdings made up 0.04% of John Overdeck's portfolio in Q2 2026, its #473 holding.
  • John Overdeck first reported a position in MarketAxess Holdings in Q2 2013 and has held it in 19 quarters since.
  • John Overdeck's MarketAxess Holdings position peaked at $96.7M in Q4 2025.
  • 392 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.