InvestorLens

MASI — MASIMO CORP

Public company

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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 MASI?

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

Confidence
67
Institutional Conviction
Mixed · 2 buying vs 1 selling last quarter
52
Macro Tailwind
Macro conditions are mixed for this sector
52
Why? — Evidence & Confidence ▾

Of 3 tracked investors who changed their MASI position last quarter, 2 bought and 1 sold (67% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 52/100 in a Overheat regime).

Supporting evidence
  • +2 tracked investors added or increased positions last quarter (George Soros, Ray Dalio)
  • +6 tracked investors reported holding MASI at their latest filing
Contradicting evidence — always shown
  • −1 tracked investor reduced or exited last quarter (0 reduced, 1 sold out)
  • −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 7/25/2026.

About MASIMO CORP (MASI)

MASIMO CORP (MASI) appears in the most recent 13F filings of 6 tracked institutional investors. The largest disclosed position is held by Izzy Englander (Millennium Management), valued at $227M. Across recent filings, tracked investors recorded 3 new positions, 1 increased, 2 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MASI

57
/100
Mixed Activity
Added / Increased4
Reduced2
Exited1
BearishBullish
Crowded Trade Score™

How many top investors track MASI

40
/100
Moderate Interest
6investors

Several tracked investors have exposure.

UndiscoveredCrowded
151015+

MASI Ownership Composition

How MASIMO CORP is held across tracked investor types, based on reported 13F positions.

Dominant Type
Other
96% of tracked value
Institutions
6
tracked investors
Total Reported
$433.4M
combined 13F value
Sectors2
  • Other95.9%
  • Hedge Funds4.1%
Other(5)
95.9%
Hedge Funds(1)
4.1%

Tracked investors reporting MASI

  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    1.3M
    Value
    $227.2M
    % Portfolio
    0.09%
  • Andreas HalvorsenDec 31, 2025
    Viking Global Investors
    Shares
    514.3K
    Value
    $66.9M
    % Portfolio
    0.18%
  • Paul Tudor JonesMar 31, 2026
    Tudor Investment Corp
    Shares
    347.4K
    Value
    $61.8M
    % Portfolio
    0.11%
  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    332.8K
    Value
    $59.2M
    % Portfolio
    0.01%
  • George SorosMar 31, 2026
    Soros Fund Management
    Shares
    100.8K
    Value
    $17.9M
    % Portfolio
    0.20%
  • Ray DalioMar 31, 2026
    Bridgewater Associates
    Shares
    1.9K
    Value
    $337.8K
    % Portfolio
    0.00%

Recent activity

Frequently asked questions

How many institutional investors hold MASI?
6 tracked institutional investors disclosed a position in MASI (MASIMO CORP) in their most recent 13F filing.
Who is the largest institutional holder of MASI?
Izzy Englander, Millennium Management, holds the largest disclosed position in MASI, valued at $227M.
Did institutional ownership of MASI increase or decrease?
Across recent 13F filings, tracked investors recorded 3 new positions, 1 increased, 2 reduced, and 1 fully exited MASI.
Where does this MASI 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.