Quick Takeaways
- MASI - MASIMO CORP has 28 insiders with reported activity on this page.
- Net insider value flow over the last year: -$3,719,852.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Ownership
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 28 Insiders of MASIMO CORP
- Symbol
- MASI on Nasdaq
- Location
- Irvine, CA
What Changed
- Buy value: $468,500; sell value: $4,188,351.
- Net share flow: -25,480.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$3,719,852.
Buys
$468,500
Shares: 3,200
Insiders: 2
Sells
$4,188,352
Shares: 28,680
Insiders: 2
Net
-$3,719,852
Shares: -25,480
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 18,680 | $0 | $2,555,570 | -$2,555,570 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 3,200 | 0 | $468,500 | $0 | +$468,500 |
| 9-12 | 0 | 10,000 | $0 | $1,632,781 | -$1,632,781 |
MASIMO CORP executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Politan Capital Management LP | Director by deputization | $744,390,354 | Mixed | 11 Mar 2026 | ||
| Joe E. Kiani | CEO and Chairman of the Board, Director | $76,686,577 | Mixed | 08 Aug 2024 | ||
| Thomas Samuel McClenahan | Evp, Gen Counsel & Corp Sec | $9,474,979 | Mixed | 28 Feb 2024 | ||
| Anand Sampath | EVP, Operations | $5,649,123 | -$2,555,570 | -31% | Filing P/S | 06 Mar 2026 |
| Blair Tripodi | COO, Consumer Division | $4,885,319 | Mixed | 23 Sep 2025 | ||
| Bilal Muhsin | Chief Operating Officer | $4,570,915 | -$1,632,781 | -26% | Mixed | 12 May 2025 |
| Tao Levy | EVP, Bus Dev | $4,334,641 | Mixed | 13 Nov 2024 | ||
| Micah W. Young | EVP & Chief Financial Officer | $4,064,887 | Mixed | 11 Mar 2026 | ||
| Craig B. Reynolds | Director | $3,064,557 | Mixed | 29 Apr 2025 | ||
| Kevin P. Duffy | President, Consumer | $2,988,646 | Mixed | 11 Apr 2022 | ||
| Catherine M. Szyman | CEO, Director | $2,470,965 | Mixed | 11 Mar 2026 | ||
| Michelle Brennan | Director, Chairman of the Board | $1,136,119 | +$30,560 | +2.8% | Filing P/S | 12 Aug 2025 |
| Thomas Harkin | Director | $1,042,301 | Mixed | 27 May 2021 | ||
| Robert A. Chapek | Director | $857,996 | Mixed | 29 Apr 2025 | ||
| William R. Jellison | Director | $740,486 | +$437,940 | +145% | Mixed | 11 Aug 2025 |
| Julie Ann Shimer | Director | $697,609 | Mixed | 26 May 2023 | ||
| H. Michael Cohen | Director | $604,753 | Mixed | 26 May 2023 | ||
| Omar Ahmed | CTIO & EVP of Engineering | $467,029 | Mixed | 13 Nov 2025 | ||
| Darlene J. S. Solomon | Director | $335,822 | Mixed | 29 Apr 2025 | ||
| Rolf A. Classon | Director | $273,032 | Mixed | 19 Dec 2023 | ||
| Timothy J. Scannell | Director | $259,464 | Mixed | 29 Apr 2025 | ||
| Wendy E. Lane | Director | $259,464 | Mixed | 29 Apr 2025 | ||
| Adam Mikkelson | Director | $194,255 | Mixed | 26 Jun 2023 | ||
| Elisabeth A. Hellmann | Chief Human Resources Officer | Mixed | 06 Mar 2026 | |||
| Tim Benner | Chief Marketing Officer | Mixed | 06 Mar 2026 | |||
| Greg Allen Meehan | Chief Commerical Officer | Mixed | 06 Mar 2026 | |||
| Paul Hataishi | SVP, Chief Accounting Officer | Mixed | 27 Feb 2023 | |||
| Charles Dadswell | EVP, General Counsel | Mixed | 06 Mar 2026 |
Top shareholders of MASIMO CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
|
Company |
7.9%
from 13D/G
|
8,855,619
|
$1,151,761,872 | — | 31 Dec 2025 | |
| FMR LLC |
13F
13D/G
|
Company |
4.5%
from 13D/G
|
7,864,164
|
$1,022,813,172 | — | 31 Dec 2025 | |
| Joe E. Kiani |
13D/G
3/4/5
|
Joe Kiani · CEO and Chairman of the Board, Director |
10%
|
5,904,629
|
$767,956,048 | -$61,400,155 | 31 Dec 2025 | |
| Politan Capital Management LP |
3/4/5
13D/G
13F
|
Director by deputization · Quentin Koffey · Company |
6.2%
from 13D/G
|
4,721,742
mixed-class rows
|
$744,390,354 | — | 11 Mar 2026 | |
| BlackRock Portfolio Management LLC |
13D/G
|
— |
8.2%
|
4,386,302
|
$570,482,438 | -$149,630,388 | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
8.3%
|
4,348,786
|
$565,603,107 | — | 31 Dec 2025 | |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ |
13F
|
Company |
5.1%
|
2,663,875
|
$346,463,583 | — | 31 Dec 2025 | |
| T. Rowe Price Investment Management, Inc. |
13F
|
Company |
4.5%
|
2,330,158
|
$303,061,000 | — | 31 Dec 2025 | |
| NAYA CAPITAL MANAGEMENT UK LTD |
13F
|
Company |
3%
|
1,560,697
|
$202,984,252 | — | 31 Dec 2025 | |
| WESTFIELD CAPITAL MANAGEMENT CO LP |
13F
|
Company |
2.9%
|
1,522,049
|
$197,957,646 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
2.7%
|
1,415,196
|
$184,060,392 | — | 31 Dec 2025 | |
| Alyeska Investment Group, L.P. |
13F
|
Company |
2.4%
|
1,259,307
|
$163,785,468 | — | 31 Dec 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
2.1%
|
1,091,326
|
$141,937,886 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.8%
|
953,976
|
$124,096,067 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
1.8%
|
920,735
|
$119,751,047 | — | 31 Dec 2025 | |
| RTW INVESTMENTS, LP |
13F
|
Company |
1.3%
|
683,294
|
$88,869,218 | — | 31 Dec 2025 | |
| Capital Research Global Investors |
13F
|
Company |
1.2%
|
637,894
|
$82,964,494 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
1.2%
|
636,698
|
$82,808,942 | — | 31 Dec 2025 | |
| Liontrust Investment Partners LLP |
13F
|
Company |
1.2%
|
627,796
|
$81,651,148 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
1.1%
|
599,274
|
$77,941,576 | — | 31 Dec 2025 | |
| Squarepoint Ops LLC |
13F
|
Company |
1.1%
|
583,747
|
$75,922,135 | — | 31 Dec 2025 | |
| VIKING GLOBAL INVESTORS LP |
13F
|
Company |
0.98%
|
514,340
|
$66,895,060 | — | 31 Dec 2025 | |
| SCHRODER INVESTMENT MANAGEMENT GROUP |
13F
|
Company |
0.91%
|
475,504
|
$62,324,309 | — | 31 Dec 2025 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.9%
|
468,407
|
$60,921,015 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.73%
|
380,464
|
$49,483,147 | — | 31 Dec 2025 | |
| NORGES BANK |
13F
|
Company |
0.72%
|
377,421
|
$49,087,375 | — | 31 Dec 2025 | |
| BAMCO INC /NY/ |
13F
|
Company |
0.72%
|
373,899
|
$48,629,304 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.69%
|
361,896
|
$47,068,205 | — | 31 Dec 2025 | |
| Gotham Asset Management, LLC |
13F
|
Company |
0.66%
|
342,194
|
$44,505,752 | — | 31 Dec 2025 | |
| Corient Private Wealth LLC |
13F
|
Company |
0.65%
|
340,230
|
$44,250,315 | — | 31 Dec 2025 | |
| Invesco Ltd. |
13F
|
Company |
0.61%
|
319,308
|
$41,529,199 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.59%
|
308,485
|
$40,121,541 | — | 31 Dec 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
0.56%
|
293,536
|
$38,177,292 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.55%
|
284,702
|
$37,028,341 | — | 31 Dec 2025 | |
| Schonfeld Strategic Advisors LLC |
13F
|
Company |
0.51%
|
265,036
|
$34,470,579 | — | 31 Dec 2025 | |
| BNP Paribas Asset Management Holding S.A. |
13F
|
Company |
0.45%
|
232,565
|
$30,248,000 | — | 31 Dec 2025 | |
| Nuveen, LLC |
13F
|
Company |
0.43%
|
224,068
|
$29,142,284 | — | 31 Dec 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
0.42%
|
219,312
|
$28,523,719 | — | 31 Dec 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
0.41%
|
213,594
|
$27,781,000 | — | 31 Dec 2025 | |
| Erste Asset Management GmbH |
13F
|
Company |
0.38%
|
200,000
|
$26,012,000 | — | 31 Dec 2025 | |
| Parkman Healthcare Partners LLC |
13F
|
Company |
0.38%
|
200,000
|
$26,012,000 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.36%
|
187,965
|
$24,446,728 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.36%
|
186,510
|
$24,257,513 | — | 31 Dec 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
0.34%
|
178,758
|
$23,249,265 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.33%
|
173,950
|
$22,624,588 | — | 31 Dec 2025 | |
| Man Group plc |
13F
|
Company |
0.28%
|
147,416
|
$19,172,925 | — | 31 Dec 2025 | |
| Grantham, Mayo, Van Otterloo & Co. LLC |
13F
|
Company |
0.28%
|
143,825
|
$18,705,880 | — | 31 Dec 2025 | |
| DF DENT & CO INC |
13F
|
Company |
0.27%
|
142,626
|
$18,550,001 | — | 31 Dec 2025 | |
| RHUMBLINE ADVISERS |
13F
|
Company |
0.24%
|
124,556
|
$16,199,688 | — | 31 Dec 2025 | |
| CITIGROUP INC |
13F
|
Company |
0.23%
|
121,231
|
$15,767,304 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for MASIMO CORP
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | 130,869 | 130,869 | 12 Mar 2026 | See footnotes | |||
| Catherine M. Szyman | MASI | Common Stock | Tax liability | -12.3% | -1,069 | 7,605 | 11 Mar 2026 | Direct | ||
| Catherine M. Szyman | MASI | Common Stock | Options Exercise | 32% | 2,101 | 8,674 | 11 Mar 2026 | Direct | ||
| Catherine M. Szyman | MASI | Restricted Stock Units | Options Exercise | -25% | -2,101 | 6,306 | 11 Mar 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Tax liability | -1.8% | -471 | 25,656 | 11 Mar 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Options Exercise | 3.46% | 873 | 26,127 | 11 Mar 2026 | Direct | ||
| Micah W. Young | MASI | Restricted Stock Units | Options Exercise | -25% | -873 | 2,622 | 11 Mar 2026 | Direct | ||
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | 142,681 | 142,681 | 11 Mar 2026 | See footnotes | |||
| Greg Allen Meehan | MASI | Restricted Stock Units | Award | 8,550 | 8,550 | 06 Mar 2026 | Direct | |||
| Tim Benner | MASI | Restricted Stock Units | Award | 6,128 | 6,128 | 06 Mar 2026 | Direct | |||
| Elisabeth A. Hellmann | MASI | Restricted Stock Units | Award | 5,985 | 5,985 | 06 Mar 2026 | Direct | |||
| Anand Sampath | MASI | Restricted Stock Units | Award | 6,840 | 6,840 | 06 Mar 2026 | Direct | |||
| Charles Dadswell | MASI | Restricted Stock Units | Award | 10,261 | 10,261 | 06 Mar 2026 | Direct | |||
| Micah W. Young | MASI | Restricted Stock Units | Award | 17,671 | 17,671 | 06 Mar 2026 | Direct | |||
| Catherine M. Szyman | MASI | Restricted Stock Units | Award | 39,904 | 39,904 | 06 Mar 2026 | Direct | |||
| Micah W. Young | MASI | Common Stock | Tax liability | -24.3% | -8,093 | 25,254 | 27 Feb 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Award | 81.8% | 15,000 | 33,347 | 27 Feb 2026 | Direct | ||
| Micah W. Young | MASI | Restricted Stock Units | Options Exercise | -100% | -15,000 | 0 | 27 Feb 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Tax liability | -5.77% | -1,123 | 18,347 | 26 Feb 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Award | 11.7% | 2,034 | 19,470 | 26 Feb 2026 | Direct | ||
| Catherine M. Szyman | MASI | Common Stock | Tax liability | -41% | -4,568 | 6,573 | 12 Feb 2026 | Direct | ||
| Catherine M. Szyman | MASI | Common Stock | Options Exercise | 11,141 | 11,141 | 12 Feb 2026 | Direct | |||
| Catherine M. Szyman | MASI | Restricted Stock Units | Options Exercise | -33.3% | -11,141 | 22,283 | 12 Feb 2026 | Direct | ||
| Anand Sampath | MASI | Common Stock | Sale | -31.4% | $2,555,570 | $136.81 | -18,680 | 40,909 | 28 Jan 2026 | Direct |
| Anand Sampath | MASI | Common Stock | Options Exercise | 101.4% | 30,000 | 59,589 | 28 Jan 2026 | Direct | ||
| Anand Sampath | MASI | Non-Qualified Stock Option (Right to Buy) | Options Exercise | -100% | -30,000 | 0 | 28 Jan 2026 | Direct | ||
| Omar Ahmed | MASI | Common Stock | Tax liability | -23% | -974 | 3,268 | 13 Nov 2025 | Direct | ||
| Omar Ahmed | MASI | Common Stock | Options Exercise | 139.9% | 2,474 | 4,242 | 13 Nov 2025 | Direct | ||
| Omar Ahmed | MASI | Restricted Stock Units | Options Exercise | -100% | -2,474 | 0 | 13 Nov 2025 | Direct | ||
| Blair Tripodi | MASI | Common Stock | Tax liability | -36.9% | -8,078 | 13,818 | 23 Sep 2025 | Direct | ||
| Blair Tripodi | MASI | Common Stock | Options Exercise | 217.5% | 15,000 | 21,896 | 23 Sep 2025 | Direct | ||
| Blair Tripodi | MASI | Restricted Stock Units | Options Exercise | -100% | -15,000 | 0 | 23 Sep 2025 | Direct | ||
| Politan Capital Management LP | MASI | Common Stock, par value $0.001 per share | Other | -2.69% | -126,888 | 4,589,648 | 29 Aug 2025 | See footnotes | ||
| Michelle Brennan | MASI | Common Stock | Purchase | 1.39% | $15,525 | $155.25 | 100 | 7,318 | 13 Aug 2025 | Direct |
| Michelle Brennan | MASI | Common Stock | Purchase | 1.4% | $15,035 | $150.35 | 100 | 7,218 | 12 Aug 2025 | Direct |
| William R. Jellison | MASI | Common Stock | Purchase | 167.6% | $437,940 | $145.98 | 3,000 | 4,790 | 11 Aug 2025 | Direct |
| Bilal Muhsin | MASI | Common Stock | Sale | -29.3% | $1,632,781 | $163.28 | -10,000 | 24,172 | 12 May 2025 | Direct |
| Bilal Muhsin | MASI | Common Stock | Options Exercise | 41.4% | 10,000 | 34,172 | 12 May 2025 | Direct | ||
| Bilal Muhsin | MASI | Non-Qualified Stock Option (Right to Buy) | Options Exercise | -100% | -10,000 | 0 | 12 May 2025 | Direct | ||
| Michelle Brennan | MASI | Restricted Stock Units | Award | 766 | 766 | 29 Apr 2025 | Direct | |||
| Darlene J. S. Solomon | MASI | Common Stock | Options Exercise | 1,790 | 1,790 | 29 Apr 2025 | Direct | |||
| Darlene J. S. Solomon | MASI | Restricted Stock Units | Award | 1,225 | 1,225 | 29 Apr 2025 | Direct | |||
| Darlene J. S. Solomon | MASI | Restricted Stock Units | Options Exercise | -100% | -1,790 | 0 | 29 Apr 2025 | Direct | ||
| Timothy J. Scannell | MASI | Common Stock | Options Exercise | 1,383 | 1,383 | 29 Apr 2025 | Direct | |||
| Timothy J. Scannell | MASI | Restricted Stock Units | Award | 1,225 | 1,225 | 29 Apr 2025 | Direct | |||
| Timothy J. Scannell | MASI | Restricted Stock Units | Options Exercise | -100% | -1,383 | 0 | 29 Apr 2025 | Direct | ||
| Wendy E. Lane | MASI | Common Stock | Options Exercise | 1,383 | 1,383 | 29 Apr 2025 | Direct | |||
| Wendy E. Lane | MASI | Restricted Stock Units | Award | 1,225 | 1,225 | 29 Apr 2025 | Direct | |||
| Wendy E. Lane | MASI | Restricted Stock Units | Options Exercise | -100% | -1,383 | 0 | 29 Apr 2025 | Direct | ||
| William R. Jellison | MASI | Common Stock | Award | 1,790 | 1,790 | 29 Apr 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.