Masimo Corporation (MASI) Insider Trading
Over the last 6 months, 140 institutions increased and 117 reduced their position (13F).
Insider Activity
Sentiment
50/100
Buys (3m)
0
Sells (3m)
0
Net (3m)
$0
Insider trades by month Buys Sells
May
Apr
Mar
May
Aug
Jan
Context3-month price +2.5%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 5, 2026 | LANE WENDY Edirector | Option | 1,225 | — |
| May 5, 2026 | Scannell Timothy Jdirector | Grant | 1,119 | — |
| May 5, 2026 | LANE WENDY Edirector | Grant | 1,119 | — |
| May 5, 2026 | Scannell Timothy Jdirector | Option | 1,225 | — |
| May 5, 2026 | Hellmann Elisabeth Aofficer: Chief Human Resources Officer | Tax | 121 | $178.43 |
| May 5, 2026 | Hellmann Elisabeth Aofficer: Chief Human Resources Officer | Option | 335 | — |
| May 5, 2026 | Brennan Michelledirector, other: Chairman of the Board | Option | 1,225 | — |
| May 5, 2026 | Brennan Michelledirector, other: Chairman of the Board | Grant | 1,119 | — |
| Mar 16, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Tax | 471 | $175.47 |
| Mar 16, 2026 | Szyman Catherine M.director, officer: CEO | Tax | 1,069 | $175.47 |
| Mar 16, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Option | 873 | — |
| Mar 16, 2026 | Szyman Catherine M.director, officer: CEO | Option | 2,101 | — |
| Mar 10, 2026 | Szyman Catherine M.director, officer: CEO | Grant | 39,904 | — |
| Mar 10, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Grant | 17,671 | — |
| Mar 10, 2026 | Meehan Greg Allenofficer: Chief Commerical Officer | Grant | 8,550 | — |
| Mar 10, 2026 | Dadswell Charlesofficer: EVP, General Counsel | Grant | 10,261 | — |
| Mar 10, 2026 | Hellmann Elisabeth Aofficer: Chief Human Resources Officer | Grant | 5,985 | — |
| Mar 10, 2026 | Sampath Anandofficer: EVP, Operations | Grant | 6,840 | — |
| Mar 10, 2026 | Benner Timofficer: Chief Marketing Officer | Grant | 6,128 | — |
| Mar 3, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Grant | 15,000 | — |
| Mar 3, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Option | 15,000 | — |
| Mar 3, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Tax | 8,093 | $175.35 |
| Feb 26, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Tax | 1,123 | $175.22 |
| Feb 26, 2026 | Young Micah Wofficer: EVP & Chief Financial Officer | Grant | 2,034 | — |
| Feb 13, 2026 | Szyman Catherine M.director, officer: CEO | Option | 11,141 | — |
| Feb 13, 2026 | Szyman Catherine M.director, officer: CEO | Tax | 4,568 | — |
| Jan 30, 2026 | Sampath Anandofficer: EVP, Ops & Clinical Research | Sell | 196 | $138.09 |
| Jan 30, 2026 | Sampath Anandofficer: EVP, Ops & Clinical Research | Option | 30,000 | $37.84 |
| Jan 30, 2026 | Sampath Anandofficer: EVP, Ops & Clinical Research | Sell | 6,560 | $137.22 |
| Jan 30, 2026 | Sampath Anandofficer: EVP, Ops & Clinical Research | Sell | 11,924 | $136.56 |
Source: MASI SEC Form 4 filings, latest May 5, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MASI positions over the last 6 months (SEC Form 13F).
Increased
140
New positions
139
Reduced
117
Sold out
457
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Reduced | 4.6M | May 13, 2026 |
| POLITAN CAPITAL MANAGEMENT LP | Unchanged | 4.6M | May 15, 2026 |
| PENTWATER CAPITAL MANAGEMENT LP | New Position | 3.2M | May 15, 2026 |
| BARCLAYS PLC | Increased | 2.7M | May 15, 2026 |
| HBK INVESTMENTS L P | New Position | 2.6M | May 15, 2026 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | 2.3M | May 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.1M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 2.0M | May 8, 2026 |
| FMR LLC | Reduced | 1.5M | May 15, 2026 |
| STATE STREET CORP | Increased | 1.4M | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 1.3M | May 15, 2026 |
| GOLDMAN SACHS GROUP INC | Reduced | 984K | May 15, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 957K | May 15, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | New Position | 856K | May 15, 2026 |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 832K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.