InvestorLens

MKTX — MARKETAXESS HLDGS INC

Public company

Sign in to save5 tracked investors reported this
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

Why are billionaires buying MKTX?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence
95
Institutional Conviction
Strong distribution · 0 buying vs 2 selling last quarter
10
Macro Tailwind
Macro conditions are mixed for this sector
52
Congressional Activity
0 congressional purchases, 1 sale disclosed in the last 6 months
Why? — Evidence & Confidence ▾

Of 2 tracked investors who changed their MKTX position last quarter, 0 bought and 2 sold (0% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 52/100 in a Squeeze regime). 0 congressional purchases, 1 sale disclosed in the last 6 months.

Supporting evidence
  • +5 tracked investors reported holding MKTX at their latest filing
Contradicting evidence — always shown
  • −2 tracked investors reduced or exited last quarter (1 reduced, 1 sold out)
  • −Congressional disclosures lean toward selling (1 sales vs 0 purchases, 6 months)
  • −13F data is disclosed up to 45 days after quarter end — positions may have changed since
Know the limits
  • · 13F disclosure lag (up to 45 days)
  • · Tracked investors are a sample, not the whole market
  • · Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 8/4/2026.

About MARKETAXESS HLDGS INC (MKTX)

MARKETAXESS HLDGS INC (MKTX) appears in the most recent 13F filings of 5 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

50
/100
Mixed Activity
Added / Increased2
Reduced1
Exited1
BearishBullish
Crowded Trade Score™

How many top investors track MKTX

33
/100
Emerging Interest
5investors

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
5
tracked investors
Total Reported
$267M
combined 13F value
Sectors2
  • Other84.4%
  • Hedge Funds15.6%
Other(4)
84.4%
Hedge Funds(1)
15.6%

Tracked investors reporting MKTX

  • 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%
  • Paul Tudor JonesDec 31, 2025
    Tudor Investment Corp
    Shares
    29.3K
    Value
    $5.3M
    % Portfolio
    0.01%
  • Ray DalioMar 31, 2026
    Bridgewater Associates
    Shares
    5.6K
    Value
    $925.2K
    % Portfolio
    0.00%

Recent activity

Frequently asked questions

How many institutional investors hold MKTX?
5 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.
MKTX (MARKETAXESS HLDGS INC) — Institutional Holders & 13F — InvestorLens