// company-profile
Masimo Corp
MASIExchangeNasdaqSectorElectromedical & Electrotherapeutic ApparatusInc.DEFilings91Insiders29
// api This Masimo Corp insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $29.7M across 50 transactions.
// 90-day insight
Over the last 90 days, Masimo Corp insiders sold $29.7M across 50 transactions with no open-market purchases.
- Most active insider: Young Micah W with 12 transactions totaling $13.0M.
- Largest single sale: $6.1M by Sampath Anand on Jun 10, 2026.
Activity skews bearish — sales outpace buys.
Institutional Ownership
Top 13F-HR holders of Masimo Corp as of 2026-03-31
Total reported AUM
$8.99B
QoQ change
+59.5%
Reporting period
2026-03-31
#1
Politan Capital Management LP
CIK 1885245
$816.4M
4.6M shares
#2
Pentwater Capital Management LP
CIK 1425851
$564.9M
3.2M shares
#3
BlackRock, Inc.
CIK 2012383
$519.6M
2.9M shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 10, 2026 | Szyman Catherine M. | MASI | Disposition | 39,904 | — | — |
| Jun 10, 2026 | Szyman Catherine M. | MASI | Disposition | 6,306 | — | — |
| Jun 10, 2026 | Young Micah W | MASI | Disposition | 10,485 | $180.00 | $1.89M |
| Jun 10, 2026 | Young Micah W | MASI | Disposition | 16,898 | $180.00 | $3.04M |
| Jun 10, 2026 | Szyman Catherine M. | MASI | Disposition | 22,283 | — | — |
45 more transactions hidden
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