Companies / Masimo Corporation
Masimo Corporation
Nasdaq: MASICIK 937556IRVINE, CA
Financials · FY2025
Ownership
52.4M shares outstanding · as of Apr 4, 2026
Ownership
| Insiders | 0.06% | 33,261 |
| 10%+ / strategic | 12.86% | 6,736,277 |
| Institutions | 103.74% | 54,325,203 |
| Public float | 0.00% | 0 |
Reported holdings exceed shares outstanding — public float shown as 0; some positions may overlap or lag.
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 12
View all →| Insider | % of shares | Shares |
|---|---|---|
Sampath AnandFormerEVP, Operations | 0.08% | 40,909 |
Young Micah WEVP & Chief Financial Officer | 0.05% | 25,656 |
Szyman Catherine M.CEOCEO · Director | 0.01% | 7,605 |
Lane Wendy EDirector | 0.00% | 0 |
Benner TimFormerChief Marketing Officer | — | — |
Dadswell CharlesFormerEVP, General Counsel | — | — |
Hellmann Elisabeth AFormerChief Human Resources Officer | — | — |
| — | — | |
Meehan Greg AllenFormerChief Commerical Officer | — | — |
| — | — |
Institutional holders 422
View all →| Holder | Value | % of shares |
|---|---|---|
| $1.15B | 16.91% | |
| $1.02B | 15.02% | |
| $596.93M | 8.76% | |
| $565.60M | 8.30% | |
| $458.21M | 4.92% | |
| $346.46M | 5.09% | |
| $202.98M | 2.98% | |
| $184.06M | 2.70% | |
| $175.89M | 1.89% | |
| $170.21M | 1.83% |
Activity
Mar 31, 2026View all →
InsidersInstitutions
Who's accumulating and trimming this stock (13F).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q2 2026 as of | BlackRock, Inc. 13F manager | Exit | Common stock | $-1.15B | -8.9M -100.00% | 0 | high |
| Q1 2026 as of | Hbk Investments L P 13F manager | New | Common stock | $458.21M | +2.6M | 2,576,109 4.92% of shares | high |
| Q1 2026 as of | Westfield Capital Management Company, L.P. 13F manager | Trim | Common stock | $-210.03M | -1.2M -77.58% | 341,229 0.65% of shares | high |
| Q2 2026 as of | State Street Corporation 13F manager | Exit | Common stock | $-184.06M | -1.4M -100.00% | 0 | high |
| Q1 2026 as of | Millennium Management LLC 13F manager | Add | Common stock | $142.45M | +801K +426.08% | 988,853 1.89% of shares | high |
| Q1 2026 as of | Balyasny Asset Management L.P. 13F manager | New | Common stock | $137.14M | +771K | 770,986 1.47% of shares | high |
| Q1 2026 as of | Magnetar Financial LLC 13F manager | Add | Common stock | $74.99M | +422K +7729.17% | 427,081 0.82% of shares | high |
| Q1 2026 as of | AQR Arbitrage LLC 13F manager | New | Common stock | $73.87M | +417K | 416,956 0.80% of shares | high |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| Joe Kiani | Passive13G/A | — |
| BlackRock Portfolio Management LLC | Passive13G/A | — |
| Fmr LLC | Passive13G/A | — |
| Joe Kiani | Passive13G/A | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| MASI | — | 574795100 |