How many institutional investors hold MKTX?

4 tracked institutional investors disclosed a position in MKTX (MARKETAXESS HLDGS INC) in their most recent 13F filing.

Who is the largest institutional holder of MKTX?

Izzy Englander, Millennium Management, holds the largest disclosed position in MKTX, valued at $199M.

Where does this MKTX ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

MKTX — MARKETAXESS HLDGS INC

Name: MARKETAXESS HLDGS INC (MKTX) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About MARKETAXESS HLDGS INC (MKTX)

MARKETAXESS HLDGS INC (MKTX) appears in the most recent 13F filings of 4 tracked institutional investors. The largest disclosed position is held by Izzy Englander (Millennium Management), valued at $199M. Across recent filings, tracked investors recorded 1 new positions, 1 increased, 1 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MKTX

/100

Mixed Activity

Added / Increased2

Reduced1

Exited1

BearishBullish

Crowded Trade Score™

How many top investors track MKTX

/100

Emerging Interest

4investors

A small number of top investors own this.

UndiscoveredCrowded

151015+

MKTX Ownership Composition

How MARKETAXESS HLDGS INC is held across tracked investor types, based on reported 13F positions.

Dominant Type

Other

84% of tracked value

Institutions

tracked investors

Total Reported

$261.7M

combined 13F value

Other84.1%
Hedge Funds15.9%

Other(3)

84.1%

Hedge Funds(1)

15.9%

Tracked investors reporting MKTX

Investor	Firm	Shares	Market value	% of portfolio	As of
Izzy Englander	Millennium Management	1.2M	$198.9M	0.08%	Mar 31, 2026
Steve Cohen	Point72 Asset Management	252.8K	$41.7M	0.05%	Mar 31, 2026
Ken Griffin	Citadel Advisors	122.7K	$20.2M	0.00%	Mar 31, 2026
Ray Dalio	Bridgewater Associates	5.6K	$925.2K	0.00%	Mar 31, 2026

Izzy EnglanderMar 31, 2026
Millennium Management
Shares
1.2M
Value
$198.9M
% Portfolio
0.08%
Steve CohenMar 31, 2026
Point72 Asset Management
Shares
252.8K
Value
$41.7M
% Portfolio
0.05%
Ken GriffinMar 31, 2026
Citadel Advisors
Shares
122.7K
Value
$20.2M
% Portfolio
0.00%
Ray DalioMar 31, 2026
Bridgewater Associates
Shares
5.6K
Value
$925.2K
% Portfolio
0.00%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Ken Griffin	Sold	-100.00%	$0	May 15, 2026
Ray Dalio	Reduced	-57.71%	$925.2K	May 15, 2026
Ken Griffin	Increased	71.02%	$126.1K	Feb 17, 2026
Ray Dalio	New	—	$2.4K	Feb 13, 2026

Ken Griffin
Sold
$0(-100.00%)May 15, 2026
Ray Dalio
Reduced
$925.2K(-57.71%)May 15, 2026
Ken Griffin
Increased
$126.1K(71.02%)Feb 17, 2026
Ray Dalio
New
$2.4KFeb 13, 2026

Frequently asked questions

How many institutional investors hold MKTX?: 4 tracked institutional investors disclosed a position in MKTX (MARKETAXESS HLDGS INC) in their most recent 13F filing.
Who is the largest institutional holder of MKTX?: Izzy Englander, Millennium Management, holds the largest disclosed position in MKTX, valued at $199M.
Did institutional ownership of MKTX increase or decrease?: Across recent 13F filings, tracked investors recorded 1 new positions, 1 increased, 1 reduced, and 1 fully exited MKTX.
Where does this MKTX ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.