Comparable stake leader
BlackRock, Inc.
SEC ownership of MASIMO CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000937556.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- MASI on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000937556
- Issuer location
- Irvine, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of MASIMO CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 7.9%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 7.9%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
7.9%
Joe E. Kiani
6.5%
Pentwater Capital Management LP
6.1%
BARCLAYS PLC
5.5%
FMR LLC
4.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
7.9%
from 13D/G
|
$826,131,120
4,644,578 shares
|
— | 31 Mar 2026 |
| Joe E. Kiani |
13D/G
3/4/5
Joe Kiani · CEO and Chairman of the Board, Director
|
6.5%
|
$652,671,750
3,657,039 shares
|
-$401,127,387 | 31 Mar 2026 |
| Pentwater Capital Management LP |
13D/G
13F
Company
|
6.1%
|
$566,820,720
3,176,000 shares
|
$0 | 31 Mar 2026 |
| BARCLAYS PLC |
13D/G
13F
Company
|
5.5%
|
$516,181,999
2,892,262 shares
|
$0 | 31 Mar 2026 |
| FMR LLC |
13D/G
13F
Company
|
4.5%
|
$317,340,559
2,349,975 shares
|
-$767,176,959 | 27 Feb 2026 |
| BlackRock Portfolio Management LLC |
13D/G
|
0.2%
|
$20,787,845
116,871 shares
|
-$759,403,692 | 31 Mar 2026 |
| Craig B. Reynolds |
3/4/5
Director
|
0.04%
|
$3,064,557
18,371 shares
mixed-class rows
|
— | 29 Apr 2025 |
| Blair Tripodi |
3/4/5
COO, Consumer Division
|
0.03%
|
$4,885,319
13,818 shares
mixed-class rows
|
— | 23 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$2,087,070.
Buys
$468,500
Insiders: 2
Sells
$2,555,570
Insiders: 1
Net
-$2,087,070
Shares: -15,480
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 3,200
Shares: 18,680
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 18,680 | $0 | $2,555,570 | -$2,555,570 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 3,200 | 0 | $468,500 | $0 | +$468,500 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 31 reporting-owner rows connected to MASIMO CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
31
Largest Forms 3/4/5 holder
Joe E. Kiani
Net 12M change
-$2,087,070
Latest report
10 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| 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 | ||
| Blair Tripodi | COO, Consumer Division | $4,885,319 | Mixed | 23 Sep 2025 | ||
| Bilal Muhsin | Chief Operating Officer | $4,570,915 | Mixed | 12 May 2025 | ||
| Tao Levy | EVP, Bus Dev | $4,334,641 | Mixed | 13 Nov 2024 | ||
| 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 | Chief Executive Officer, Director | $1,443,986 | Mixed | 10 Jun 2026 | ||
| 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 | ||
| Micah W. Young | EVP, Chief Financial Officer | $600,301 | Mixed | 10 Jun 2026 | ||
| Omar Ahmed | CTIO & EVP of Engineering | $467,029 | Mixed | 13 Nov 2025 | ||
| Rolf A. Classon | Director | $273,032 | Mixed | 19 Dec 2023 | ||
| Adam Mikkelson | Director | $194,255 | Mixed | 26 Jun 2023 | ||
| Darlene J. S. Solomon | Director | $41,242 | Mixed | 10 Jun 2026 | ||
| Politan Capital Management LP | Director by deputization | $41,242 | Mixed | 10 Jun 2026 | ||
| Timothy J. Scannell | Director | $31,864 | Mixed | 10 Jun 2026 |
Recent insider transactions for MASIMO CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Darlene J. S. Solomon | MASI | Common Stock | Disposed to Issuer | -100% | -3,015 | 0 | 10 Jun 2026 | Direct | ||
| Darlene J. S. Solomon | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | Direct | ||
| Timothy J. Scannell | MASI | Common Stock | Disposed to Issuer | -100% | -2,608 | 0 | 10 Jun 2026 | Direct | ||
| Timothy J. Scannell | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | Direct | ||
| Wendy E. Lane | MASI | Common Stock | Disposed to Issuer | -100% | -2,608 | 0 | 10 Jun 2026 | Direct | ||
| Wendy E. Lane | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | Direct | ||
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | -100% | -273,550 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | -100% | -273,550 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | -100% | -273,550 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Forward Sale Contract (obligation to sell) | Other | -100% | -273,550 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Common Stock | Disposed to Issuer | -100% | -4,590,873 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Common Stock | Disposed to Issuer | -100% | -4,590,873 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Common Stock | Disposed to Issuer | -100% | -4,590,873 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Common Stock | Disposed to Issuer | -100% | -4,590,873 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | See footnotes | ||
| Politan Capital Management LP | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | See footnotes | ||
| Michelle Brennan | MASI | Common Stock | Disposed to Issuer | -100% | -9,309 | 0 | 10 Jun 2026 | Direct | ||
| Michelle Brennan | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -1,119 | 0 | 10 Jun 2026 | Direct | ||
| Paul Hataishi | MASI | Common Stock | Disposed to Issuer | -100% | -13,317 | 0 | 10 Jun 2026 | Direct | ||
| Paul Hataishi | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -11,275 | 0 | 10 Jun 2026 | Direct | ||
| Catherine M. Szyman | MASI | Common Stock | Disposed to Issuer | -100% | -7,605 | 0 | 10 Jun 2026 | Direct | ||
| Catherine M. Szyman | MASI | Performance-Based Restricted Stock Unit | Disposed to Issuer | -100% | -49,243 | 0 | 10 Jun 2026 | Direct | ||
| Catherine M. Szyman | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -18,617 | 0 | 10 Jun 2026 | Direct | ||
| Catherine M. Szyman | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -68,493 | 0 | 10 Jun 2026 | Direct | ||
| Anand Sampath | MASI | Common Stock | Disposed to Issuer | -100% | -33,901 | 0 | 10 Jun 2026 | Direct | ||
| Anand Sampath | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -35,512 | 0 | 10 Jun 2026 | Direct | ||
| Anand Sampath | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -18,646 | 0 | 10 Jun 2026 | Direct | ||
| Greg Allen Meehan | MASI | Performance-Based Restricted Stock Unit | Disposed to Issuer | -100% | -5,801 | 0 | 10 Jun 2026 | Direct | ||
| Greg Allen Meehan | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -4,306 | 0 | 10 Jun 2026 | Direct | ||
| Greg Allen Meehan | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -10,483 | 0 | 10 Jun 2026 | Direct | ||
| Elisabeth A. Hellmann | MASI | Common Stock | Disposed to Issuer | -100% | -214 | 0 | 10 Jun 2026 | Direct | ||
| Elisabeth A. Hellmann | MASI | Performance-Based Restricted Stock Unit | Disposed to Issuer | -100% | -4,020 | 0 | 10 Jun 2026 | Direct | ||
| Elisabeth A. Hellmann | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -2,873 | 0 | 10 Jun 2026 | Direct | ||
| Elisabeth A. Hellmann | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -6,990 | 0 | 10 Jun 2026 | Direct | ||
| Charles Dadswell | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -22,147 | 0 | 10 Jun 2026 | Direct | ||
| Tim Benner | MASI | Performance-Based Restricted Stock Unit | Disposed to Issuer | -100% | -3,490 | 0 | 10 Jun 2026 | Direct | ||
| Tim Benner | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -2,537 | 0 | 10 Jun 2026 | Direct | ||
| Tim Benner | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -7,291 | 0 | 10 Jun 2026 | Direct | ||
| Micah W. Young | MASI | Common Stock | Disposed to Issuer | -100% | -25,656 | 0 | 10 Jun 2026 | Direct | ||
| Micah W. Young | MASI | Performance-Based Restricted Stock Unit | Disposed to Issuer | -100% | -27,383 | 0 | 10 Jun 2026 | Direct | ||
| Micah W. Young | MASI | Non-Qualified Stock Option (Right to Buy) | Disposed to Issuer | -100% | -62,651 | 0 | 10 Jun 2026 | Direct | ||
| Micah W. Young | MASI | Restricted Stock Units | Disposed to Issuer | -100% | -20,293 | 0 | 10 Jun 2026 | Direct | ||
| Timothy J. Scannell | MASI | Common Stock | Options Exercise | 88.6% | 1,225 | 2,608 | 29 Apr 2026 | Direct | ||
| Timothy J. Scannell | MASI | Restricted Stock Units | Options Exercise | -100% | -1,225 | 0 | 29 Apr 2026 | Direct | ||
| Wendy E. Lane | MASI | Common Stock | Options Exercise | 88.6% | 1,225 | 2,608 | 29 Apr 2026 | Direct | ||
| Wendy E. Lane | MASI | Restricted Stock Units | Options Exercise | -100% | -1,225 | 0 | 29 Apr 2026 | Direct | ||
| Michelle Brennan | MASI | Common Stock | Options Exercise | 16.7% | 1,225 | 8,543 | 29 Apr 2026 | Direct | ||
| Michelle Brennan | MASI | Restricted Stock Units | Options Exercise | -100% | -1,225 | 0 | 29 Apr 2026 | Direct |
* marks a reported price that did not pass the local price check.