$MKTX

$165.13 +$0.11 (0.07%) Close

$MKTX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 35.2M shares outstanding

Who owns MKTX?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 60.7%

BlackRock, Inc. 11.4% · Primecap Management Co/ca/ 10.0%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

395

-54 vs last qtr

Net shares bought

+828.7K

by institutions in Q2 2026

New / sold out

57 / 111

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

North Reef Capital Management LP +1.5M
Norges Bank NEW +572.4K

Biggest sellers in Q2 2026

Millennium Management LLC −977.6K
Aqr Capital Management LLC −696.5K

Who is planning to sell?

Notices of proposed sale, last 12 months

$1.18M

5 notices from 2 people

Shares covered

7.3K

0.02% of the company

Arranged in advance

15%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

William Frank Cruger, Jr. Director $1.01M
Pintoff Scott Officer 10b5-1 $178K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−1.6%

−0.18% a year

Each share's claim on the business

+1.6%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$771M vs $243M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years71% 3–5 years3% 1–3 years16% Under 1 year10%

Quarterly turnover

17.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MKTX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	4.0M	11.37%	−75.3K (−1.8%)	≤2021	0.0%
Shares held by quarter Peak holding4.1M (Q1'26) Change over 8 quarters+1.1M Share of the company11.370% BlackRock, Inc.'s full portfolio →
PM Primecap Management Co/ca/	3.5M	9.96%	+157.8K (+4.7%)	≤2021	0.2%
Shares held by quarter Peak holding3.5M (Q2'26) Change over 8 quarters+2.2M Share of the company9.960% Primecap Management Co/ca/'s full portfolio →

BlackRock, Inc.

4.0M

% of company

11.37%

Change vs last qtr

−75.3K (−1.8%)

Held since

≤2021

Primecap Management Co/ca/

3.5M

% of company

9.96%

Change vs last qtr

+157.8K (+4.7%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding MarketAxess Holdings Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MKTX on Form N-PORT; together they hold 51.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$241M	2.1M	6.04%	0.22%	June 30, 2026
VC Vanguard Capital Opportunity Fund Vanguard Horizon Funds	$208M	1.8M	5.21%	0.64%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$241M

% of company

6.04%

% of the fund

0.22%

As of

June 30, 2026

Vanguard Capital Opportunity Fund

Vanguard Horizon Funds

Position value

$208M

% of company

5.21%

% of the fund

0.64%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding MarketAxess Holdings Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MK McPherson Kevin M Insider	85.9K	0.24%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.240% McPherson Kevin M's insider activity →

McPherson Kevin M

Insider

85.9K

% of company

0.24%

Change vs last qtr

—

Held since

—

Comments