HEARTLAND ADVISORS INC

Position in MKTX — Marketaxess Holdings Inc

CIK 937394 MILWAUKEE, WI

Position in MKTX

as of Jun 30, 2026 · filed Aug 11, 2026 Compact

Position Value

$11,908,051

+$2,284,108 QoQ

Shares Held

104,926

+79.9% QoQ

Ownership

0.298%

of shares outstanding

% of Portfolio

0.53%

of 13F equity value

Holder Rank

#53

of 393 holders

Holding Since

Dec 2025

3 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Financial Services · as of Jun 30, 2026

HEARTLAND ADVISORS INC holds $20,991,046 across 3 Capital Markets names. MKTX ranks #1 (56.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MKTX	Marketaxess Holdings Inc This page	104,926	$11,908,051
2	SF	Stifel Financial Corp	121,653	$8,487,729
3	IBKR	Interactive Brokers Group, Inc.	6,839	$595,266

3 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$11,908,051	104,926	+79.9%	Shares	Defined	2026-08-11
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.