MASI
Masimo CorpCompany with tickers: MASI
CIK
937556
CUSIP
574795100
Shares Outstanding
52,369,086
Website
https://www.masimo.com
13F Activity (30d)
157 filings
149 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 1
Total Value: $0
Total Shares: 0
Institutional Ownership Trend
28 quarters
Quarterly Activity
vs Mar 31, 2026
New
0
Increased
0
Decreased
1
Sold Out
380
Unchanged
0
Holder count:
-380
Institutional value:
-100.0%
Shares held:
-100.0%
Top Buyers
vs Mar 31, 2026No qualifying movers this quarter.
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Small Politan Capital Management LP | −4,589,648 | 0 |
Top New Positions
vs Mar 31, 2026No new positions this quarter.
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| — Joe Kiani | 3,657,039 | $650,477,526 | |
| Mid HBK INVESTMENTS L P | 2,576,109 | $458,212,507 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 2,050,045 | $364,641,504 | |
| Mega STATE STREET CORP | 1,437,724 | $255,727,967 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | 956,736 | $170,174,631 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Small Politan Capital Management LP | $0 | — | 0 | Shares | Sole | 2026-06-11 | ||||
| No holders match your search. | ||||||||||