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MASI
MASIMO CORPHealth CareHealth Care EquipmentLatest close $1797 of 27 marquee funds currently hold1 CUSIP mapped
Current holders
7
27 funds tracked
Ever held
13
Current + past
New this quarter
1
Exited this quarter
1
Marquee-fund ownership over time
Nov 13, 2020Nov 14, 2023Aug 14, 2025May 15, 2026
Now
7
This quarter's activity
New positions opened
Positions exited
Current holders
Sorted by tenure (longest first)| Fund | First disclosed | Held | Entry price | Latest close | Return on entry |
|---|---|---|---|---|---|
| Bridgewater Associates | Q4 2020 | 23Q | $246 | $179 | -27% |
| Citadel Advisors | Q3 2024(8Q snapshot) | 7Q | $124 | $179 | +44% |
| Millennium Management | Q3 2024(8Q snapshot) | 7Q | $124 | $179 | +44% |
| D.E. Shaw re-entered | Q4 2024(8Q snapshot) | 6Q | $160 | $179 | +12% |
| AQR Capital Management | Q4 2024(8Q snapshot) | 6Q | $160 | $179 | +12% |
| Renaissance Technologies re-entered | Q2 2025(8Q snapshot) | 4Q | $153 | $179 | +17% |
| Soros Fund Management | Q2 2026(8Q snapshot) | 1Q | $178 | $179 | +0% |
“Return on entry” is the price-only move from the fund's first disclosure to today — it ignores any adds, trims, or dividends. A fund that built its position over multiple quarters has a true cost basis somewhere between entry price and latest close; this figure is the upper bound.
Past holders
Funds that exited at some point| Fund | Last entry | Exited | Entry → Exit | Return |
|---|---|---|---|---|
| Viking Global Investors | Q3 2025 | Q2 2026 | → $178 | +18% |
| Two Sigma Investments | Q3 2024 | Q4 2025 | → $151 | +22% |
| Point72 Asset Management 2× in & out | Q1 2025 | Q4 2025 | → $151 | -17% |
| Glenview Capital | Q4 2023 | Q1 2024 | → $133 | +49% |
| D1 Capital Partners | Q4 2021 | Q2 2022 | → $135 | -55% |
| Maverick Capital | Q2 2021 | Q1 2022 | → $225 | +5% |
Insider activity
Form 4 — officers, directors, 10%+ ownersFiled within two business days of each transaction by anyone with material insider status at MASIMO CORP. Pair with the holders table above as a sanity check: heavy insider buying alongside marquee-fund accumulation is the strongest accumulation signal; heavy insider selling alongside fund exits is the strongest distribution signal.
Filings · last 30d
4
Filings · last 90d
17
Total on file
457
Recent SEC buffer
Most recent
May 5, 2026
30d / 90d windows measured from May 5, 2026 — the most recent Form 4 on file — not from today.
- Form 40000937556-26-000061May 5, 2026
- Form 40000937556-26-000059May 5, 2026
- Form 40000937556-26-000057May 5, 2026
- Form 40000937556-26-000055May 5, 2026
- Form 40000937556-26-000044Mar 16, 2026
- Form 40000937556-26-000042Mar 16, 2026
- Form 40001104659-26-027790Mar 13, 2026
- Form 40000937556-26-000040Mar 10, 2026
- Form 40000937556-26-000038Mar 10, 2026
- Form 40000937556-26-000034Mar 10, 2026
- Form 40000937556-26-000031Mar 10, 2026
- Form 40000937556-26-000027Mar 10, 2026
- Form 40000937556-26-000025Mar 10, 2026
- Form 40000937556-26-000023Mar 10, 2026
- Form 40000937556-26-000021Mar 3, 2026
Showing 15 of 457 recent Form 4 filings. Browse all on EDGAR ↗
Fundamentals
XBRL · MASIMO CORPAnnual figures sourced directly from MASIMO CORP's 10-K / 10-Q filings via SEC EDGAR XBRL. Latest fiscal year and the year-over-year change, with up to ten years of history.
Revenue
$1.53B
FY2026+9% YoY
Net income
-$151.5M
FY2026+50% YoY
EPS (diluted)
$-2.80
FY2026+50% YoY
Free cash flow(?)
$198.4M
FY2026+13% YoY
Recent SEC filings
10-K · 10-Q · 8-K · 13D/G · proxyThe most recent material filings for MASIMO CORP — earnings, material events, ownership disclosures, proxy statements. Form 4 insider activity is shown in the panel above.
- 10-QQuarterly reportMay 5, 2026
- 8-KFORM 8-KMay 4, 2026
- 10-K/AAnnual report (amended)May 1, 2026
- 8-KFORM 8-KApr 23, 2026
- 10-KAnnual reportFeb 27, 2026
- 8-KFORM 8-KFeb 17, 2026
- 8-KMaterial eventJan 12, 2026
- 8-KMaterial eventDec 3, 2025
- 8-KMaterial eventDec 1, 2025
- 10-QQuarterly reportNov 4, 2025
- 8-KMaterial eventNov 4, 2025
- 8-KMaterial eventSep 29, 2025
- 8-KMaterial eventSep 23, 2025
- 8-KMaterial eventAug 19, 2025
- 10-QQuarterly reportAug 5, 2025
Trade history
Every open→close lifecycle across tracked funds| Fund | Open date | Close date | Open price | Close price / current | Return |
|---|---|---|---|---|---|
| Soros Fund Management | Q2 2026 | open | $178 | $179 | +0% |
| D.E. Shaw | Q1 2026 | open | $175 | $179 | +2% |
| Renaissance Technologies | Q1 2026 | open | $133 | $179 | +34% |
| Viking Global Investors | Q3 2025 | Q2 2026 | $152 | $178 | +18% |
| Renaissance Technologies | Q2 2025 | Q4 2025 | $153 | $152 | -0% |
| Point72 Asset Management | Q1 2025 | Q4 2025 | $181 | $151 | -17% |
| D.E. Shaw | Q4 2024 | Q1 2025 | $160 | $181 | +13% |
| AQR Capital Management | Q4 2024 | open | $160 | $179 | +12% |
| Citadel Advisors | Q3 2024 | open | $124 | $179 | +44% |
| Two Sigma Investments | Q3 2024 | Q4 2025 | $124 | $151 | +22% |
| Millennium Management | Q3 2024 | open | $124 | $179 | +44% |
| Point72 Asset Management | Q3 2024 | Q4 2024 | $124 | $160 | +29% |
| Glenview Capital | Q4 2023 | Q1 2024 | $89 | $133 | +49% |
| D1 Capital Partners | Q4 2021 | Q2 2022 | $299 | $135 | -55% |
| Maverick Capital | Q2 2021 | Q1 2022 | $213 | $225 | +5% |
| Bridgewater Associates | Q4 2020 | open | $246 | $179 | -27% |
Caveats
- Covers only the 27 marquee funds tracked here, not the full institutional universe. A “0 holders” reading does not mean unowned.
- Heavy funds (Renaissance Technologies, Citadel Advisors, Soros Fund Management, Two Sigma Investments, D.E. Shaw, AQR Capital Management, Millennium Management, Point72 Asset Management) use 8-quarter snapshots, so their pre-2024 history is missing.
- “Current” reflects each fund's most recent 13F — filings lag the actual trade by up to 45 days; positions shown may have changed since.
- Cost = price at the entry filing date. Re-entered positions show the most recent open lot.
- Options, ADRs, and unmapped CUSIPs are excluded from the follower-backtest pipeline that produces these snapshots, so certain holding types won't appear here.