Masimo

Masimo Corporation is a medical technology company that develops and manufactures noninvasive patient monitoring devices, including pulse oximetry sensors, patient monitors, and related software used in hospitals and home settings. Its flagship Masimo SET pulse oximetry technology is used on an estimated 200+ million patients worldwide each year. The company is headquartered in Irvine, California and trades on Nasdaq under the ticker MASI; Danaher Corporation agreed in February 2026 to acquire Masimo for roughly $9.9 billion.