As of the latest Form 4 filed Jun 12, 2026.
What Masimo Corporation insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 27 most recent filings for MASI.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-12 | 2026-06-10 | Solomon Darlene J. S. Director | DDisposition | −3.02K | $180.00 | $543K | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Scannell Timothy J Director | DDisposition | −2.61K | $180.00 | $469K | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | LANE WENDY E Director | DDisposition | −2.61K | $180.00 | $469K | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Politan Capital Management LP Insider | DDisposition | −4.59M | $180.00 | $826M | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Brennan Michelle Director | DDisposition | −9.31K | $180.00 | $1.68M | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Hataishi Paul SVP, Chief Accounting Officer | DDisposition | −13.3K | $180.00 | $2.40M | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Sampath Anand EVP, Operations | DDisposition | −33.9K | $180.00 | $6.10M | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Hellmann Elisabeth A Chief Human Resources Officer | DDisposition | −214.00 | $180.00 | $38.5K | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Young Micah W EVP, Chief Financial Officer | DDisposition | −25.7K | $180.00 | $4.62M | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Szyman Catherine M. Chief Executive Officer | DDisposition | −7.61K | $180.00 | $1.37M | No | Form 4 ↗ |
| 2026-05-05 | 2026-04-29 | Scannell Timothy J Director | MExercise | +1.23K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-05 | 2026-04-29 | LANE WENDY E Director | MExercise | +1.23K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-05 | 2026-04-29 | Brennan Michelle Director | MExercise | +1.23K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-05 | 2026-04-21 | Hellmann Elisabeth A Chief Human Resources Officer | FTax | −121.00 | $178.43 | $21.6K | No | Form 4 ↗ |
| 2026-05-05 | 2026-04-21 | Hellmann Elisabeth A, Chief Human Resources Officer | MExercise | +335.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-16 | 2026-03-11 | Szyman Catherine M. CEO | FTax | −1.07K | $175.47 | $188K | No | Form 4 ↗ |
| 2026-03-16 | 2026-03-11 | Szyman Catherine M., CEO | MExercise | +2.10K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-16 | 2026-03-11 | Young Micah W EVP & Chief Financial Officer | FTax | −471.00 | $175.47 | $82.6K | No | Form 4 ↗ |
| 2026-03-16 | 2026-03-11 | Young Micah W, EVP & Chief Financial Officer | MExercise | +873.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-26 | Young Micah W EVP & Chief Financial Officer | FTax | −1.12K | $175.22 | $197K | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-26 | Young Micah W, EVP & Chief Financial Officer | AAward | +2.03K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-13 | 2026-02-12 | Szyman Catherine M. CEO | FTax | −4.57K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-13 | 2026-02-12 | Szyman Catherine M., CEO | MExercise | +11.1K | $132.96 | $1.48M | No | Form 4 ↗ |
| 2026-01-30 | 2026-01-28 | Sampath Anand EVP, Ops & Clinical Research | SSale | −196.00 | $138.09 | $27.1K | No | Form 4 ↗ |
| 2026-01-30 | 2026-01-28 | Sampath Anand, EVP, Ops & Clinical Research | SSale | −6.56K | $137.22 | $900K | No | Form 4 ↗ |
| 2026-01-30 | 2026-01-28 | Sampath Anand, EVP, Ops & Clinical Research | SSale | −11.9K | $136.56 | $1.63M | No | Form 4 ↗ |
| 2026-01-30 | 2026-01-28 | Sampath Anand, EVP, Ops & Clinical Research | MExercise | +30.0K | $37.84 | $1.14M | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MASI’s full analysis or the market-wide insider trading feed. The tabs above jump to MASI’s other SEC data.
Source: SEC Form 4 filings for MASI, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.