Security key
574795100
MASIMO CORP - Common Stock, par value $0.001 per share (MASI)
CUSIP: 574795100
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Total 13F shares
- 90
- Total 13F value
- $16,196
- Share change
- -54,319,407
- SEC-reported price per share
- $179.98
- Number of holders
- 2
- Value change
- -$9,635,920,033
- Number of sells
- 440
- Shares outstanding
- 52,065,574
Holder snapshot
5 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
2
Top holders
2
MASI full security history
Ownership snapshot
Full 13F holder table
MASIMO CORP SEC filings
MASIMO CORP company facts
Broader feeds
Ownership snapshot
Top reported holders of MASI - MASIMO CORP - Common Stock, par value $0.001 per share (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
15/15
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 7.9%
13D/G row: BlackRock, Inc.
Showing 1-6 of 15 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 7.9%.
15 of 15 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%
BARCLAYS PLC
5.5%
FMR LLC
4.5%
BlackRock Portfolio Management LLC
0.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 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 |
| 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 |
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.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
2
Shares
90
Rows available
2
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
450
Q2 2026 holders
2
Holder diff
-448
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|