MASI · Insider Trading
Masimo Corporation
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-05 | Elisabeth A Hellmann | Chief Human Resources Officer | MIXED | +214 | −$21.59K |
| 2026-05-05 | Michelle Brennan | Director | M | +1,225 | — |
| 2026-05-05 | Wendy E Lane | Director | M | +1,225 | — |
| 2026-05-05 | Timothy J Scannell | Director | M | +1,225 | — |
| 2026-03-16 | Micah W Young | EVP & Chief Financial Officer | MIXED | +402 | −$82.65K |
| 2026-03-16 | Catherine M. Szyman | CEO | MIXED | +1,032 | −$187.58K |
| 2026-03-13 | Quentin Koffey | — | J | +1,094,200 deriv. | — |
| 2026-03-10 | Catherine M. Szyman | CEO | A | +39,904 deriv. | — |
| 2026-03-10 | Micah W Young | EVP & Chief Financial Officer | A | +17,671 deriv. | — |
| 2026-03-10 | Charles Dadswell | EVP, General Counsel | A | +10,261 deriv. | — |
| 2026-03-10 | Anand Sampath | EVP, Operations | A | +6,840 deriv. | — |
| 2026-03-10 | Elisabeth A Hellmann | Chief Human Resources Officer | A | +5,985 deriv. | — |
| 2026-03-10 | Tim Benner | Chief Marketing Officer | A | +6,128 deriv. | — |
| 2026-03-10 | Greg Allen Meehan | Chief Commerical Officer | A | +8,550 deriv. | — |
| 2026-03-03 | Micah W Young | EVP & Chief Financial Officer | MIXED | +6,907 | −$1.42M |
| 2026-02-26 | Micah W Young | EVP & Chief Financial Officer | MIXED | +911 | −$196.77K |
| 2026-02-13 | Catherine M. Szyman | CEO | MIXED | +6,573 | +$1.48M |
| 2026-01-30 | Anand Sampath | EVP, Ops & Clinical Research | MIXED | +11,320 | −$1.42M |
| 2025-11-17 | Omar Ahmed | CTIO & EVP of Engineering | MIXED | +1,500 | +$377.11K |
| 2025-09-25 | Blair Tripodi | COO, Consumer Division | MIXED | +6,922 | +$2.13M |
| 2025-09-03 | Charles Dadswell | Director | — | — | — |
| 2025-08-29 | Politan Capital Management LP | — | J | −507,552 | — |
| 2025-08-14 | Michelle Brennan | Director | Buy | +200 | +$30.56K |
| 2025-08-12 | William R Jellison | Director | Buy | +3,000 | +$437.94K |
| 2025-08-11 | Michelle Brennan | Director | A | +766 deriv. | — |
| 2025-05-14 | Bilal Muhsin | Chief Operating Officer | MIXED | — | −$1.29M |
| 2025-05-02 | William R Jellison | Director | A | +1,790 | — |
| 2025-05-02 | Wendy E Lane | Director | M | +1,383 | — |
| 2025-05-02 | Timothy J Scannell | Director | M | +1,383 | — |
| 2025-05-02 | Darlene J. S. Solomon | Director | M | +1,790 | — |
| 2025-05-01 | Politan Capital Management LP | — | M | +7,160 | — |
| 2025-05-01 | Robert A Chapek | Director | M | +1,790 | — |
| 2025-05-01 | Craig B Reynolds | Director | M | +1,790 | — |
| 2025-05-01 | Michelle Brennan | Director | M | +1,790 | — |
| 2025-04-23 | Elisabeth A Hellmann | Chief Human Resources Officer | A | +4,213 deriv. | — |
| 2025-03-14 | Craig B Reynolds | Director | Sell | −2,053 | −$341.07K |
| 2025-03-14 | Bilal Muhsin | Chief Operating Officer | A | +11,283 deriv. | — |
| 2025-03-13 | Micah W Young | EVP & Chief Financial Officer | A | +11,234 deriv. | — |
| 2025-03-13 | Catherine M. Szyman | CEO | A | +27,024 deriv. | — |
| 2025-03-12 | Bilal Muhsin | Chief Operating Officer | MIXED | — | −$3.89M |
| 2025-03-04 | Micah W Young | EVP & Chief Financial Officer | MIXED | +6,900 | −$1.53M |
| 2025-03-04 | Bilal Muhsin | Chief Operating Officer | MIXED | +6,902 | −$1.53M |
| 2025-03-04 | Blair Tripodi | COO, Consumer Division | MIXED | +6,896 | −$1.53M |
| 2025-02-14 | Catherine M. Szyman | CEO | A | +33,424 deriv. | — |
| 2025-02-14 | Michelle Brennan | Interim CEO | MIXED | +4,100 | −$864.52K |
| 2025-01-17 | Robert A Chapek | Director | M | +1,665 | — |
| 2024-11-15 | Tao Levy | EVP, Bus Dev | MIXED | +15,602 | −$2.33M |
| 2024-11-13 | Michelle Brennan | Interim CEO | A | +8,916 deriv. | — |
| 2024-10-18 | Wendy E Lane | Director | A | +1,383 deriv. | — |
| 2024-10-18 | Timothy J Scannell | Director | A | +1,383 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Politan Capital Management LP | — | 4,589,648 | $825.91M |
| Anand Sampath | EVP, Operations | 59,589 | $10.72M |
| Bilal Muhsin | Chief Operating Officer | 34,172 | $6.15M |
| Tao Levy | EVP, Bus Dev | 26,810 | $4.82M |
| Micah W Young | EVP & Chief Financial Officer | 25,656 | $4.62M |
| Blair Tripodi | COO, Consumer Division | 21,896 | $3.94M |
| Craig B Reynolds | Director | 18,371 | $3.31M |
| Catherine M. Szyman | CEO | 8,674 | $1.56M |
| Michelle Brennan | Interim CEO | 8,543 | $1.54M |
| William R Jellison | Director | 4,790 | $861.96K |
| Omar Ahmed | CTIO & EVP of Engineering | 4,242 | $763.35K |
| Robert A Chapek | Director | 3,455 | $621.73K |
| Wendy E Lane | Director | 2,608 | $469.31K |
| Timothy J Scannell | Director | 2,608 | $469.31K |
| Darlene J. S. Solomon | Director | 1,790 | $322.11K |
| Elisabeth A Hellmann | Chief Human Resources Officer | 214 | $38.51K |
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.
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.