HEARTLAND ADVISORS INC

Position in MKTX — Marketaxess Holdings Inc

CIK 937394 MILWAUKEE, WI

Position in MKTX

as of Mar 31, 2026 · filed May 6, 2026 Compact

Position Value

$9,623,943

+$4,472,637 QoQ

Shares Held

58,334

+105.2% QoQ

Ownership

0.164%

of shares outstanding

% of Portfolio

0.49%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2025

2 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Financial Services · as of Mar 31, 2026

HEARTLAND ADVISORS INC holds $20,110,090 across 3 Capital Markets names. MKTX ranks #2 (47.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SF	Stifel Financial Corp	134,153	$9,916,589
2	MKTX	Marketaxess Holdings Inc This page	58,334	$9,623,943
3	IBKR	Interactive Brokers Group, Inc.	8,492	$569,558

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$9,623,943	58,334	+105.2%	Shares	Defined	2026-05-06
2025-12-31	$5,151,306	28,421	—	Shares	Defined	2026-02-11
No filing history on record for this holder in this stock.