Security key
574795100
MASIMO CORP - Common Stock, par value $0.001 per share (MASI)
CUSIP: 574795100
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Total 13F shares
- 55,356,007
- Total 13F value
- $7,200,597,392
- Share change
- -843,871
- Put/Call ratio
- 229%
- SEC-reported price per share
- $130.06
- Number of holders
- 390
- Value change
- -$130,410,541
- Number of buys
- 177
- Number of sells
- 181
- Shares outstanding
- 52,065,574
Holder snapshot
7 signals
Show 1 more signal
Security identity
Who this page is about.
1 source field
Report period
Q4 2025
Institutions
390
Top holders
10
MASI full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
MASIMO CORP SEC filings
MASIMO CORP company facts
Broader feeds
Reporting periods
Holder history for CUSIP 574795100
Recent filing periods:
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
13 Nov 2025
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%
Craig B. Reynolds
0.04%
Blair Tripodi
0.03%
Robert A. Chapek
0.01%
Omar Ahmed
0.01%
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
|
$1,528,779,050
10,361,091 shares
|
— | 30 Sep 2025 |
| 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 |
| Robert A. Chapek |
3/4/5
Director
|
0.01%
|
$857,996
3,455 shares
mixed-class rows
|
— | 29 Apr 2025 |
| Omar Ahmed |
3/4/5
CTIO & EVP of Engineering
|
0.01%
|
$467,029
3,268 shares
|
— | 13 Nov 2025 |
| FMR LLC |
13F
Company
|
16%
|
$1,211,934,519
8,213,721 shares
|
— | 30 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.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
390
Shares
55,356,007
Rows available
390
| 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 Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
354
Q4 2025 holders
390
Holder diff
36
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend