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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
2022
Q1 		– Sell
-6,600
Closed -$2.71M – 3691
2021
Q4 		$2.71M Buy
6,600
+1,700
+35% +$671K 0.01% 1650
2021
Q3 		$2.06M Buy
4,900
+3,900
+390% +$1.79M ﹤0.01% 1964
2021
Q2 		$464K Hold
1,000
– – ﹤0.01% 3171
2021
Q1 		$498K Sell
1,000
-300
-23% -$160K ﹤0.01% 2937
2020
Q4 		$742K Buy
+1,300
New +$708K ﹤0.01% 2217

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.