Updated Jul 16, 2026 · Last SEC filing 2026-06-12
MASIMO CORP (MASI) has filed 17 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-12. 3 Form 8-K material event filings were reported by MASI in the last 90 days. InsiderAlpha tracks every MASI SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0000937556 |
|---|
| Form 4 filings (90d) | 17 |
|---|---|
| Form 8-K filings (90d) | 3 |
| Latest Form 4 filing | 2026-06-12 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Young Micah W | EVP, Chief Financial Officer | D — Derivative transaction | 25.7K | $180.00 | $4.62M | SEC | |
| Hellmann Elisabeth A | Chief Human Resources Officer | D — Derivative transaction | 214 | $180.00 | $39K | SEC | |
| Scannell Timothy J | Director | D — Derivative transaction | 2.6K | $180.00 | $469K | SEC | |
| Szyman Catherine M. | Chief Executive Officer | D — Derivative transaction | 7.6K | $180.00 | $1.37M | SEC | |
| LANE WENDY E | Director | D — Derivative transaction | 2.6K | $180.00 | $469K | SEC | |
| Sampath Anand | EVP, Operations | D — Derivative transaction | 33.9K | $180.00 | $6.10M | SEC | |
| Hataishi Paul | SVP, Chief Accounting Officer | D — Derivative transaction | 13.3K | $180.00 | $2.40M | SEC | |
| Brennan Michelle | Director | D — Derivative transaction | 9.3K | $180.00 | $1.68M | SEC | |
| Solomon Darlene J. S. | Director | D — Derivative transaction | 3.0K | $180.00 | $543K | SEC | |
| LANE WENDY E | Director | M — Option exercise | 1.2K | $0.00 | — | SEC | |
| Brennan Michelle | Director | M — Option exercise | 1.2K | $0.00 | — | SEC | |
| Scannell Timothy J | Director | M — Option exercise | 1.2K | $0.00 | — | SEC | |
| Hellmann Elisabeth A | Chief Human Resources Officer | M — Option exercise | 335 | $0.00 | — | SEC | |
| Hellmann Elisabeth A | Chief Human Resources Officer | F — Tax withholding / forfeiture | 121 | $178.43 | $22K | SEC | |
| Young Micah W | EVP & Chief Financial Officer | F — Tax withholding / forfeiture | 471 | $175.47 | $83K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for MASIMO CORP (MASI). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Young Micah W | 12 | $13.00M |
| Sampath Anand | 10 | $8.35M |
| Hellmann Elisabeth A | 8 | $872K |
| Szyman Catherine M. | 6 | $10.48M |
| Hataishi Paul | 6 | $2.40M |
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in MASI insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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