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3M4 · Unknown

Masimo Corp

USA Unknown Filing: 2026-03-31
34/100
Smart-money confidence1 of 3 sources positive
Weak — few signals

No standout activity across the feeds we track.

Hedge funds
46
Congress
No data
Insiders
No data
Cross-source blend of hedge-fund breadth, Congress trades, and insider Form 4s.  ·  how the score works
Who's behind the signal
Every informed buyer we can see on 3M4, across all three feeds.
Hedge funds · 8
Soros Fund Management (Soros) New position
Tudor Investment (Paul Tudor Jones) Increased +786%
Millennium Management (Englander) Increased +426%
Citadel Advisors Increased +554%
Bridgewater Associates (Dalio) Increased +17%
Gotham Asset Mgmt (Greenblatt) Unchanged
+2 more in the full breakdown below ↓
Congress · 0
No congressional trades on record.
Insiders
No significant Form 4 insider activity in the window.
Not a model pick — but on our radar. MASIMO CORP isn't in the top-10 model right now, but 8 tracked investors hold it. Everything below is real signal from public filings — treat this as a watch candidate, not a conviction call.
8
Investors
1
New positions
4
Increasing
2
Decreasing
1
Unchanged
Price History
Loading price data...
Return: High: Low:
Who's Holding This Stock
Position sizes and recent activity from tracked institutional investors
Soros Fund Management (Soros)
Trust weight: 1.5×
New position
% of portfolio
0.3%
Position change
NEW
0.3% of Soros Fund Management's portfolio
Tudor Investment (Paul Tudor Jones)
Trust weight: 1.2×
Increased +786%
% of portfolio
0.1%
Position change
+786%
0.1% of Tudor Investment's portfolio
Millennium Management (Englander)
Trust weight: 1.0×
Increased +426%
% of portfolio
0.1%
Position change
+426%
0.1% of Millennium Management's portfolio
Citadel Advisors
Trust weight: 1.0×
Increased +554%
% of portfolio
0.0%
Position change
+554%
0.0% of Citadel Advisors's portfolio
Bridgewater Associates (Dalio)
Trust weight: 1.3×
Increased +17%
% of portfolio
0.0%
Position change
+17%
0.0% of Bridgewater Associates's portfolio
Gotham Asset Mgmt (Greenblatt)
Trust weight: 1.1×
Unchanged
% of portfolio
0.2%
Position change
—
0.2% of Gotham Asset Mgmt's portfolio
AQR Capital Management
Trust weight: 1.0×
Decreased −24%
% of portfolio
0.1%
Position change
−24%
0.1% of AQR Capital Management's portfolio
D.E. Shaw & Co
Trust weight: 1.0×
Decreased −70%
% of portfolio
0.0%
Position change
−70%
0.0% of D.E. Shaw & Co's portfolio
Portfolio Allocation
How much of each investor's portfolio is allocated to MASIMO CORP
⚠ Disclaimer: This page is for informational purposes only. Holdings data from SEC EDGAR 13F filings, delayed up to 135 days. Not a recommendation to buy or sell MASIMO CORP or any security.

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