MASI
Masimo Corporation
NASDAQ: MASI · HEALTHCARE · MEDICAL DEVICES
$178.50
-0.04% today
Updated 2026-06-05
Market cap
$9.42B
P/E ratio
44.43
P/S ratio
6.05x
EPS (TTM)
$4.05
Dividend yield
—
52W range
$5 – $180
Volume
0.8M
Masimo Corporation (MASI) Insider transactions
Net insider activity
Net selling (304,316 shares)
Buy transactions
53
Sell transactions
47
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-04-29 | SCANNELL, TIMOTHY J | Director | Sale | 1,225 | — | — |
| 2026-04-29 | SCANNELL, TIMOTHY J | Director | Buy | 1,225 | — | — |
| 2026-04-29 | LANE, WENDY E | Director | Sale | 1,225 | — | — |
| 2026-04-29 | LANE, WENDY E | Director | Buy | 1,225 | — | — |
| 2026-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Sale | 1,225 | — | — |
| 2026-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 1,225 | — | — |
| 2026-04-23 | SCANNELL, TIMOTHY J | Director | Buy | 1,119 | $178.71 | $199976.49 |
| 2026-04-23 | LANE, WENDY E | Director | Buy | 1,119 | $178.71 | $199976.49 |
| 2026-04-23 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 1,119 | $178.71 | $199976.49 |
| 2026-04-21 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Sale | 335 | — | — |
| 2026-04-21 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Buy | 335 | — | — |
| 2026-04-21 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Sale | 121 | $178.43 | $21590.03 |
| 2026-03-12 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Buy | 130,869 | — | — |
| 2026-03-11 | YOUNG, MICAH W | EVP & Chief Financial Officer | Sale | 873 | — | — |
| 2026-03-11 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 873 | — | — |
| 2026-03-11 | YOUNG, MICAH W | EVP & Chief Financial Officer | Sale | 471 | $175.47 | $82646.37 |
| 2026-03-11 | SZYMAN, CATHERINE M. | Director, CEO | Sale | 2,101 | — | — |
| 2026-03-11 | SZYMAN, CATHERINE M. | Director, CEO | Buy | 2,101 | — | — |
| 2026-03-11 | SZYMAN, CATHERINE M. | Director, CEO | Sale | 1,069 | $175.47 | $187577.43 |
| 2026-03-11 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Buy | 142,681 | — | — |
| 2026-03-06 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 17,671 | — | — |
| 2026-03-06 | SZYMAN, CATHERINE M. | Director, CEO | Buy | 39,904 | — | — |
| 2026-03-06 | SAMPATH, ANAND | EVP, Operations | Buy | 6,840 | — | — |
| 2026-03-06 | MEEHAN, GREG ALLEN | Chief Commerical Officer | Buy | 8,550 | — | — |
| 2026-03-06 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Buy | 5,985 | — | — |
| 2026-03-06 | DADSWELL, CHARLES | EVP, General Counsel | Buy | 10,261 | — | — |
| 2026-03-06 | BENNER, TIM | Chief Marketing Officer | Buy | 6,128 | — | — |
| 2026-02-27 | YOUNG, MICAH W | EVP & Chief Financial Officer | Sale | 15,000 | — | — |
| 2026-02-27 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 15,000 | — | — |
| 2026-02-27 | YOUNG, MICAH W | EVP & Chief Financial Officer | Sale | 8,093 | $175.35 | $1.42M |
| 2026-02-26 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 2,034 | — | — |
| 2026-02-26 | YOUNG, MICAH W | EVP & Chief Financial Officer | Sale | 1,123 | $175.22 | $196772.06 |
| 2026-02-12 | SZYMAN, CATHERINE M. | Director, CEO | Sale | 11,141 | — | — |
| 2026-02-12 | SZYMAN, CATHERINE M. | Director, CEO | Buy | 11,141 | $132.96 | $1.48M |
| 2026-02-12 | SZYMAN, CATHERINE M. | Director, CEO | Sale | 4,568 | — | — |
| 2026-01-28 | SAMPATH, ANAND | EVP, Ops & Clinical Research | Sale | 30,000 | — | — |
| 2026-01-28 | SAMPATH, ANAND | EVP, Ops & Clinical Research | Buy | 30,000 | $37.84 | $1.14M |
| 2026-01-28 | SAMPATH, ANAND | EVP, Ops & Clinical Research | Sale | 11,924 | $136.56 | $1.63M |
| 2026-01-28 | SAMPATH, ANAND | EVP, Ops & Clinical Research | Sale | 6,560 | $137.22 | $900163.20 |
| 2026-01-28 | SAMPATH, ANAND | EVP, Ops & Clinical Research | Sale | 196 | $138.09 | $27065.64 |
| 2025-11-13 | AHMED, OMAR | CTIO & EVP of Engineering | Sale | 2,474 | — | — |
| 2025-11-13 | AHMED, OMAR | CTIO & EVP of Engineering | Buy | 2,474 | $152.43 | $377111.82 |
| 2025-11-13 | AHMED, OMAR | CTIO & EVP of Engineering | Sale | 974 | — | — |
| 2025-09-23 | TRIPODI, BLAIR | COO, Consumer Division | Sale | 15,000 | — | — |
| 2025-09-23 | TRIPODI, BLAIR | COO, Consumer Division | Buy | 15,000 | $142.13 | $2.13M |
| 2025-09-23 | TRIPODI, BLAIR | COO, Consumer Division | Sale | 8,078 | — | — |
| 2025-08-29 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Sale | 126,888 | — | — |
| 2025-08-13 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 100 | $155.25 | $15525.00 |
| 2025-08-12 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 100 | $150.35 | $15035.00 |
| 2025-08-11 | JELLISON, WILLIAM R | Director | Buy | 3,000 | $145.98 | $437940.00 |
| 2025-07-01 | MASIMO, CORP | 10% Owner | Sale | 289,779 | — | — |
| 2025-07-01 | MASIMO, CORP | 10% Owner | Sale | 531,548 | $2.25 | $1.20M |
| 2025-07-01 | MASIMO, CORP | 10% Owner | Buy | 289,779 | $0.00 | $28.98 |
| 2025-05-12 | MUHSIN, BILAL | Chief Operating Officer | Sale | 10,000 | $34.51 | $345100.00 |
| 2025-05-12 | MUHSIN, BILAL | Chief Operating Officer | Buy | 10,000 | $34.51 | $345100.00 |
| 2025-05-12 | MUHSIN, BILAL | Chief Operating Officer | Sale | 5,594 | $163.51 | $914663.75 |
| 2025-05-12 | MUHSIN, BILAL | Chief Operating Officer | Sale | 3,881 | $162.72 | $631512.44 |
| 2025-05-12 | MUHSIN, BILAL | Chief Operating Officer | Sale | 525 | $164.96 | $86605.05 |
| 2025-04-29 | SOLOMON, DARLENE J. S. | Director | Sale | 1,790 | — | — |
| 2025-04-29 | SOLOMON, DARLENE J. S. | Director | Buy | 1,225 | — | — |
| 2025-04-29 | SOLOMON, DARLENE J. S. | Director | Buy | 1,790 | — | — |
| 2025-04-29 | SCANNELL, TIMOTHY J | Director | Sale | 1,383 | — | — |
| 2025-04-29 | SCANNELL, TIMOTHY J | Director | Buy | 1,225 | — | — |
| 2025-04-29 | SCANNELL, TIMOTHY J | Director | Buy | 1,383 | — | — |
| 2025-04-29 | REYNOLDS, CRAIG B | Director | Sale | 1,790 | — | — |
| 2025-04-29 | REYNOLDS, CRAIG B | Director | Buy | 1,790 | — | — |
| 2025-04-29 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Sale | 1,790 | — | — |
| 2025-04-29 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Buy | 1,225 | — | — |
| 2025-04-29 | POLITAN, CAPITAL MANAGEMENT LP | Director by deputization | Buy | 1,790 | — | — |
| 2025-04-29 | LANE, WENDY E | Director | Sale | 1,383 | — | — |
| 2025-04-29 | LANE, WENDY E | Director | Buy | 1,225 | — | — |
| 2025-04-29 | LANE, WENDY E | Director | Buy | 1,383 | — | — |
| 2025-04-29 | JELLISON, WILLIAM R | Director | Sale | 1,790 | — | — |
| 2025-04-29 | JELLISON, WILLIAM R | Director | Buy | 1,225 | — | — |
| 2025-04-29 | JELLISON, WILLIAM R | Director | Buy | 1,790 | — | — |
| 2025-04-29 | CHAPEK, ROBERT A | Director | Sale | 1,790 | — | — |
| 2025-04-29 | CHAPEK, ROBERT A | Director | Buy | 1,790 | — | — |
| 2025-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Sale | 1,790 | — | — |
| 2025-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 1,225 | — | — |
| 2025-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 766 | — | — |
| 2025-04-29 | BRENNAN, MICHELLE | Director, Chairman of the Board | Buy | 1,790 | — | — |
| 2025-04-21 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Buy | 1,340 | — | — |
| 2025-04-21 | HELLMANN, ELISABETH A | Chief Human Resources Officer | Buy | 2,873 | — | — |
| 2025-03-14 | REYNOLDS, CRAIG B | Director | Sale | 2,053 | $166.13 | $341067.97 |
| 2025-03-13 | MUHSIN, BILAL | Chief Operating Officer | Buy | 3,512 | — | — |
| 2025-03-13 | MUHSIN, BILAL | Chief Operating Officer | Buy | 7,771 | — | — |
| 2025-03-11 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 3,495 | — | — |
| 2025-03-11 | YOUNG, MICAH W | EVP & Chief Financial Officer | Buy | 7,739 | — | — |
| 2025-03-11 | SZYMAN, CATHERINE M. | Director, CEO | Buy | 8,407 | — | — |
| 2025-03-11 | SZYMAN, CATHERINE M. | Director, CEO | Buy | 18,617 | — | — |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 30,000 | $37.84 | $1.14M |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Buy | 30,000 | $37.84 | $1.14M |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 10,087 | $166.03 | $1.67M |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 6,965 | $170.86 | $1.19M |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 3,935 | $165.18 | $649983.30 |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 2,400 | $163.28 | $391872.00 |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 1,761 | $169.37 | $298260.57 |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 1,716 | $171.76 | $294740.16 |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 1,700 | $167.97 | $285549.00 |
| 2025-03-10 | MUHSIN, BILAL | Chief Operating Officer | Sale | 1,436 | $166.71 | $239395.56 |
Frequently asked questions
Are MASI insiders buying or selling?
Over the transactions on record, MASI insiders have been net buyers, with about $14.14M in stock sold across 47 sales, against 13 open-market purchases.
Does insider selling at MASI mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which MASI insiders are selling the most?
Recent selling is concentrated in a few names. MUHSIN, BILAL accounts for the largest share on record, with about $8.14M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.