MASI (Masimo Corporation)
Insider Trading Activity
Every open-market purchase and sale reported by MASI officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-05 | Elisabeth A Hellmann | Chief Human Resources Officer | MIXED | — | — |
| 2026-05-05 | Michelle Brennan | Director | M | — | — |
| 2026-05-05 | WENDY E LANE | Director | M | — | — |
| 2026-05-05 | Timothy J Scannell | Director | M | — | — |
| 2026-03-16 | Micah W Young | EVP & Chief Financial Officer | MIXED | — | — |
| 2026-03-16 | Catherine M. Szyman | CEO | MIXED | — | — |
| 2026-03-13 | Quentin Koffey | — | J | — | — |
| 2026-03-10 | Catherine M. Szyman | CEO | A | — | — |
| 2026-03-10 | Micah W Young | EVP & Chief Financial Officer | A | — | — |
| 2026-03-10 | Charles Dadswell | EVP, General Counsel | A | — | — |
| 2026-03-10 | Anand Sampath | EVP, Operations | A | — | — |
| 2026-03-10 | Elisabeth A Hellmann | Chief Human Resources Officer | A | — | — |
| 2026-03-10 | Tim Benner | Chief Marketing Officer | A | — | — |
| 2026-03-10 | Greg Allen Meehan | Chief Commerical Officer | A | — | — |
| 2026-03-03 | Micah W Young | EVP & Chief Financial Officer | MIXED | — | — |
| 2026-02-26 | Micah W Young | EVP & Chief Financial Officer | MIXED | — | — |
| 2026-02-13 | Catherine M. Szyman | CEO | MIXED | — | — |
| 2026-01-30 | Anand Sampath | EVP, Ops & Clinical Research | MIXED | — | — |
| 2025-11-17 | Omar Ahmed | CTIO & EVP of Engineering | MIXED | — | — |
| 2025-09-25 | Blair Tripodi | COO, Consumer Division | MIXED | — | — |
| 2025-09-03 | Charles Dadswell | Director | — | — | — |
| 2025-08-29 | Politan Capital Management LP | — | J | — | — |
| 2025-08-14 | Michelle Brennan | Director | Buy | — | — |
| 2025-08-12 | William R Jellison | Director | Buy | — | — |
| 2025-08-11 | Michelle Brennan | Director | A | — | — |
| 2025-05-14 | Bilal Muhsin | Chief Operating Officer | MIXED | — | — |
| 2025-05-02 | William R Jellison | Director | A | — | — |
| 2025-05-02 | WENDY E LANE | Director | M | — | — |
| 2025-05-02 | Timothy J Scannell | Director | M | — | — |
| 2025-05-02 | Darlene J. S. Solomon | Director | M | — | — |
| 2025-05-01 | Politan Capital Management LP | — | M | — | — |
| 2025-05-01 | Robert A Chapek | Director | M | — | — |
| 2025-05-01 | CRAIG B REYNOLDS | Director | M | — | — |
| 2025-05-01 | Michelle Brennan | Director | M | — | — |
| 2025-04-23 | Elisabeth A Hellmann | Chief Human Resources Officer | A | — | — |
| 2025-03-14 | CRAIG B REYNOLDS | Director | Sell | — | — |
| 2025-03-14 | Bilal Muhsin | Chief Operating Officer | A | — | — |
| 2025-03-13 | Micah W Young | EVP & Chief Financial Officer | A | — | — |
| 2025-03-13 | Catherine M. Szyman | CEO | A | — | — |
| 2025-03-12 | Bilal Muhsin | Chief Operating Officer | MIXED | — | — |
| 2025-03-04 | Micah W Young | EVP & Chief Financial Officer | MIXED | — | — |
| 2025-03-04 | Bilal Muhsin | Chief Operating Officer | MIXED | — | — |
| 2025-03-04 | Blair Tripodi | COO, Consumer Division | MIXED | — | — |
| 2025-02-14 | Catherine M. Szyman | CEO | A | — | — |
| 2025-02-14 | Michelle Brennan | Interim CEO | MIXED | — | — |
| 2025-01-17 | Robert A Chapek | Director | M | — | — |
| 2024-11-15 | Tao Levy | EVP, Bus Dev | MIXED | — | — |
| 2024-11-13 | Michelle Brennan | Interim CEO | A | — | — |
| 2024-10-18 | WENDY E LANE | Director | A | — | — |
| 2024-10-18 | Timothy J Scannell | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | — | 4,714,746 | — |
| — | — | 4,713,518 | — |
| — | — | 4,589,648 | — |
| — | CEO and Chairman of the Board | 655,659 | — |
| — | Chief Technical Officer | 360,660 | — |
| — | EVP, Business Dev., GC & Sec. | 145,900 | — |
| — | Director | 99,800 | — |
| — | EVP, CIO | 91,593 | — |
| — | President, Masimo Europe | 74,250 | — |
| — | Director | 70,200 | — |
| — | Director | 67,549 | — |
| — | EVP, Operations | 59,589 | — |
| — | Director | 55,522 | — |
| — | EVP, GEN COUNSEL & CORP SEC | 37,141 | — |
| — | Pres, WW OEM Business... | 35,022 | — |
| — | Chief Operating Officer | 34,172 | — |
| — | Pres-WW OEM & Global Health | 28,600 | — |
| — | EVP, Bus Dev | 26,810 | — |
| — | EVP & Chief Financial Officer | 25,656 | — |
| — | COO, Consumer Division | 21,896 | — |
| — | Director | 18,371 | — |
| — | EVP & Chief Financial Officer | 14,660 | — |
| — | Chief Operating Officer | 10,524 | — |
| — | EVP, Bus Dev | 10,000 | — |
| — | EVP, Acute Care Sales | 9,000 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MASI quote page; the site-wide leaderboard is on the insider transactions hub.