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Heartland Advisors’s MarketAxess Holdings MKTX Stock Holding History

Heartland 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
Q2 		$11.9M Buy
104,926
+46,592
+80% +$6.64M 0.53% 62
2026
Q1 		$9.62M Buy
58,334
+29,913
+105% +$5.24M 0.49% 71
2025
Q4 		$5.15M Buy
+28,421
New +$4.85M 0.28% 141

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

Heartland Advisors's MKTX Position: Q2 2026 in Review

Heartland Advisors increased its MarketAxess Holdings (MKTX) stake by 80% in Q2 2026, buying an estimated $6.64M and bringing the position to 104,926 shares worth $11.9M. The position accounts for 0.53% of the portfolio, ranked #62.

Heartland Advisors first reported a position in MKTX in Q4 2025 and has held it in 3 quarters since. 395 funds tracked by Wall St. Rank hold MKTX as of Q2 2026.

  • Heartland Advisors held 104,926 shares of MarketAxess Holdings worth $11.9M as of Q2 2026.
  • Heartland Advisors bought 46,592 MarketAxess Holdings shares in Q2 2026, an estimated $6.64M.
  • MarketAxess Holdings made up 0.53% of Heartland Advisors's portfolio in Q2 2026, its #62 holding.
  • Heartland Advisors first reported a position in MarketAxess Holdings in Q4 2025 and has held it in 3 quarters since.
  • 395 funds tracked by Wall St. Rank held MarketAxess Holdings as of Q2 2026.

Based on Heartland Advisors's 13F filing for Q2 2026, filed 11 Aug 2026.