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MKTX Institutional Ownership & 13F Holders | SmartMoneyDB

MKTXMARKETAXESS HLDGS INC

COM · CUSIP 57060D108

Smart Money Ownership

Of the 13 tracked institutions holding MKTX, 8 have a 3-year clone track record — 6 of them beat the S&P. Average holder's clone alpha: +4.3pt. It's a gauge of who owns the name, not just how many.

Steve Cohen

$41.7M · 0.1% of book

$198.9M · 0.1% of book

+4.0pt

MKTX (MARKETAXESS HLDGS INC) Institutional Ownership Summary

Among the 13 tracked institutional investors we monitor, MKTX (MARKETAXESS HLDGS INC) is held with a combined value of $2.58B across 15,238,311 shares. The largest holder is VANGUARD GROUP INC with a position worth $695.98M (0.01% of their portfolio). Point72 Asset Management, L.P. opened a new position in the most recent quarter. 6 funds increased their holdings. 6 funds reduced their position.

Total Institutional Value

$2.58B

Total Shares Held

15,238,311

Institutional Holders

% of Shares Outstanding

42.9%

of 35.54M shares · SEC 2026-05-04

Days to Cover

3.7-0.3%

2.10M shares short · FINRA 2026-07-15

Tracked 13F institutions hold 42.9% of MKTX's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-05-04), not a live float.

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

MILLENNIUM MANAGEMENT LLC+242% shares~$140.6M BlackRock, Inc.+9% shares~$54.4M Point72 Asset Management, L.P.New position~$41.7M AQR CAPITAL MANAGEMENT LLC+5% shares~$20.7M STATE STREET CORP+3% shares~$5.4M

13F Institutional Holders

Sort

AQR CAPITAL MANAGEMENT LLC

MILLENNIUM MANAGEMENT LLC

0.08% of book+241.6%

$198.86M

Point72 Asset Management, L.P.

0.07% of bookNew

$41.71M

RENAISSANCE TECHNOLOGIES LLC

Gotham Asset Management, LLC

0.03% of book+109.6%

$9.93M

#	Fund	Value↓	Shares	Portfolio %	Change
1	VANGUARD GROUP INC	$695.98M	3,839,889	0.01%	-0.4%
2	BlackRock, Inc.	$672.32M	4,075,154	0.01%	+8.8%
3	AQR CAPITAL MANAGEMENT LLC	$442.76M	2,683,745	0.20%	+4.9%
4	FMR LLC	$250.67M	1,519,421	0.01%	-24.2%
5	STATE STREET CORP	$211.32M	1,280,857	0.01%	+2.6%
6	MILLENNIUM MANAGEMENT LLC	$198.86M	1,205,388	0.08%	+241.6%
7	Point72 Asset Management, L.P.	$41.71M	252,825	0.07%	New
8	RENAISSANCE TECHNOLOGIES LLC	$27.57M	167,100	0.04%	-5.1%
9	CITADEL ADVISORS LLC	$13.55M	82,159	0.01%	-86.9%
10	Gotham Asset Management, LLC	$9.93M	60,213	0.03%	+109.6%

Congress Trading

2 members · 3 disclosed trades in MKTX

Member	Type	Amount	Date
Josh Gottheimer	Sell	$1,001 - $15,000	Apr 9, 2026
Julie Johnson	Sell	$1,001 - $15,000	Feb 12, 2025
Julie Johnson	Buy	$1,001 - $15,000	Jan 15, 2025

Frequently Asked Questions

Which institutional investors own the most MKTX stock?

As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of MKTX with a position worth $695.98M, representing 0.01% of their portfolio. In total, 13 institutional investors hold MKTX with a combined value of $2.58B.

Are hedge funds buying or selling MKTX?

In the most recent quarter, 1 fund opened a new position in MKTX. Additionally, 6 increased their holdings and 6 reduced their positions.

What percentage of MKTX is owned by institutional investors?

Institutional investors hold $2.58B worth of MKTX stock across 13 positions. The largest institutional holder is VANGUARD GROUP INC with $695.98M in holdings.

What is a 13F filing and why does it matter for MKTX?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MKTX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track MKTX institutional moves

Get notified when hedge funds change their MKTX positions.