Masimo Corporation (MASI) has 20 known insider and institutional holders on record. The largest holder is Politan Capital Management LP with 142,681 shares. Other notable holders include KIANI JOE E and McClenahan Thomas Samuel.
Over the last 12 months, insiders have made 37 transactions in MASI stock — 14 buys (valued at $468.5K) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
MASI Insider Ownership
Top Holder
Politan Capital Management LP
142,681 shares
Buys (12 mo)
14
$468.5K value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Politan Capital Management Lp |
Other: Director By Deputization |
142,681 |
2026-03-13 |
|
| 2 |
Kiani Joe E |
CEO and Chairman of the Board |
68,252 |
2024-08-12 |
|
| 3 |
Mcclenahan Thomas Samuel |
EVP, Gen Counsel & Corp Sec |
36,747 |
2024-03-01 |
|
| 4 |
Leclercq Thierry |
EVP, Bus Dev |
25,000 |
2017-05-10 |
|
| 5 |
Duffy Kevin P |
President, Consumer |
18,893 |
2022-04-14 |
|
| 6 |
Reynolds Craig B |
Director |
16,581 |
2025-03-14 |
|
| 7 |
Fishel Rick |
Pres, Ww Oem Business... |
15,000 |
2017-07-13 |
|
| 8 |
Levy Tao |
EVP, Bus Dev |
11,208 |
2024-03-01 |
|
| 9 |
Dadswell Charles |
EVP, General Counsel |
10,261 |
2026-03-10 |
|
| 10 |
Barker Steven |
Director |
10,000 |
2020-04-15 |
|
| 11 |
De Raad Mark |
EVP & Chief Financial Officer |
10,000 |
2017-06-07 |
|
| 12 |
Meehan Greg Allen |
Chief Commerical Officer |
8,550 |
2026-03-10 |
|
| 13 |
Brennan Michelle |
Other: Chairman of the Board |
7,218 |
2025-08-14 |
|
| 14 |
Fitch Sanford |
Director |
7,000 |
2019-11-05 |
|
| 15 |
Tripodi Blair |
COO, Consumer Division |
6,896 |
2025-03-04 |
|
| 16 |
Sampath Anand |
EVP, Operations |
6,840 |
2026-03-10 |
|
| 17 |
Szyman Catherine M. |
CEO |
6,306 |
2026-03-16 |
|
| 18 |
Benner Tim |
Chief Marketing Officer |
6,128 |
2026-03-10 |
|
| 19 |
Hellmann Elisabeth A |
Chief Human Resources Officer |
5,985 |
2026-03-10 |
|
| 20 |
Harkin Thomas |
Director |
5,840 |
2020-11-05 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-11 |
Young Micah W |
EVP & Chief Financial Officer |
Option Exercise (Sell) |
873 |
- |
- |
| 2026-03-11 |
Szyman Catherine M. |
CEO |
Option Exercise (Sell) |
2,101 |
- |
- |
| 2026-03-12 |
Politan Capital Management Lp |
Other: Director By Deputization |
Other (Buy) |
130,869 |
- |
- |
| 2026-03-11 |
Politan Capital Management Lp |
Other: Director By Deputization |
Other (Buy) |
142,681 |
- |
- |
| 2026-03-06 |
Meehan Greg Allen |
Chief Commerical Officer |
RSU Award |
8,550 |
- |
- |
| 2026-03-06 |
Hellmann Elisabeth A |
Chief Human Resources Officer |
RSU Award |
5,985 |
- |
- |
| 2026-03-06 |
Benner Tim |
Chief Marketing Officer |
RSU Award |
6,128 |
- |
- |
| 2026-03-06 |
Young Micah W |
EVP & Chief Financial Officer |
RSU Award |
17,671 |
- |
- |
| 2026-03-06 |
Dadswell Charles |
EVP, General Counsel |
RSU Award |
10,261 |
- |
- |
| 2026-03-06 |
Szyman Catherine M. |
CEO |
RSU Award |
39,904 |
- |
- |
| 2026-03-06 |
Sampath Anand |
EVP, Operations |
RSU Award |
6,840 |
- |
- |
| 2026-02-27 |
Young Micah W |
EVP & Chief Financial Officer |
Option Exercise (Sell) |
15,000 |
- |
- |
| 2026-02-26 |
Young Micah W |
EVP & Chief Financial Officer |
Tax Withholding of RSU |
1,123 |
$175.22 |
$196.77K |
| 2026-02-12 |
Szyman Catherine M. |
CEO |
Tax Withholding of RSU |
4,568 |
- |
- |
| 2026-01-28 |
Sampath Anand |
EVP, Ops & Clinical Research |
Option Exercise (Sell) |
30,000 |
$37.84 |
$1.14M |
| 2025-11-13 |
Ahmed Omar |
Ctio & EVP of Engineering |
Option Exercise (Sell) |
2,474 |
- |
- |
| 2025-09-23 |
Tripodi Blair |
COO, Consumer Division |
Option Exercise (Sell) |
15,000 |
- |
- |
| 2025-08-18 |
Dadswell Charles |
Director |
Unknown |
- |
- |
- |
| 2025-08-29 |
Politan Capital Management Lp |
Other: Director By Deputization |
Other (Sell) |
126,888 |
- |
- |
| 2025-08-13 |
Brennan Michelle |
Other: Chairman of the Board |
Informative Buy |
100 |
$155.25 |
$15.53K |
| 2025-08-12 |
Brennan Michelle |
Other: Chairman of the Board |
Informative Buy |
100 |
$150.35 |
$15.04K |
| 2025-08-11 |
Jellison William R |
Director |
Informative Buy |
3,000 |
$145.98 |
$437.94K |
| 2025-07-31 |
Meehan Greg Allen |
Chief Commerical Officer |
Unknown |
1,933 |
- |
- |
| 2025-07-31 |
Ahmed Omar |
Ctio & EVP of Engineering |
Unknown |
1,316 |
- |
- |
| 2025-04-29 |
Brennan Michelle |
Other: Chairman of the Board |
RSU Award |
766 |
- |
- |
