Institutional shares held 43.9 Million
128K calls
101K puts
Total value of holdings $7.07B
$20.6M calls
$16.3M puts
Market Cap $8.46B
52,530,200 Shares Out.
Institutional ownership 83.62%
# of Institutions 406


Latest Institutional Activity in MASI

Top Purchases

Q1 2025
Massachusetts Financial Services CO Shares Held: 1.97M ($317M)
Q1 2025
Lisanti Capital Growth, LLC Shares Held: 30.5K ($4.91M)
Q1 2025
Perpetual LTD Shares Held: 30.2K ($4.86M)
Q1 2025
Victory Capital Management Inc Shares Held: 26.4K ($4.24M)
Q1 2025
Calamos Advisors LLC Shares Held: 23.4K ($3.77M)

Top Sells

Q1 2025
Assenagon Asset Management S.A. Shares Held: 4.38K ($705K)
Q1 2025
Gamma Investing LLC Shares Held: 738 ($119K)
Q1 2025
Kbc Group Nv Shares Held: 2.11K ($339K)
Q1 2025
Allspring Global Investments Holdings, LLC Shares Held: 38.3K ($6.17M)
Q1 2025
Exchange Traded Concepts, LLC Shares Held: 3.54K ($570K)

About MASI

Masimo Corporation develops, manufactures, and markets noninvasive monitoring technologies and hospital automation solutions worldwide. The company offers masimo signal extraction technology (SET) pulse oximetry with measure-through motion and low perfusion pulse oximetry monitoring to address the primary limitations of conventional pulse oximetry. It also provides Masimo rainbow SET platform that includes rainbow SET Pulse CO-Oximetry products that noninvasively monitor hemoglobin species, including oxygen saturation, pulse rate, perfusion index, pleth variability index, and respiration rate from the pleth; noninvasively monitor hemoglobin concentration, and carboxyhemoglobin and methemoglobin; monitor arterial oxygen saturation and acoustic respiration rate; and calculates oxygen content and oxygen reserve index. It offers SedLine brain function monitoring technology to measure the brain's electrical activity by detecting EEG signals; capnography and gas monitoring products comprising external plug-in-and-measure capnography and gas analyzers, integrated modules, handheld capnograph and capnometer devices, and capnography sampling lines; O3 regional oximetry for tissue oxygen saturation measurement; and hemodynamic monitoring solutions. Its Masimo Hospital Automation platform includes Patient SafetyNet, Patient SafetyNet surveillance, Kite, UniView, Replica, UniView : 60, and MyView. It offers connectivity devices; and nasal high flow ventilation and neuromodulation solutions. It provides its products through direct sales force, distributors, and original equipment manufacturers partners to hospitals, emergency medical service and home care providers, long-term care facilities, physician offices, veterinarians, and consumers; and non-medical/consumer products through e-commerce site, masimopersonalhealth.com. The company was incorporated in 1989 and is headquartered in Irvine, California.


Insider Transactions at MASI

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
365K Shares
From 14 Insiders
Exercise of conversion of derivative security 354K shares
Grant, award, or other acquisition 10.7K shares
Sell / Disposition
75.6K Shares
From 7 Insiders
Payment of exercise price or tax liability 43.5K shares
Open market or private sale 32.1K shares

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P - Open market or private purchase×
S - Open market or private sale×
V - Transaction voluntarily reported earlier than required×
A - Grant, award, or other acquisition×
D - Sale (or disposition) back to the issuer×
F - Payment of exercise price or tax liability×
I - Discretionary transaction×
M - Exercise of conversion of derivative security×
C - Conversion of derivative security×
E - Expiration of short derivative position×
H - Expiration (or cancellation) of long derivative position with value received×
O - Exercise of out-of-the-money derivative securities×
X - Exercise of in-the-money or at-the-money derivatives securities×
G - Bona fide gift×
L - Small Acquisition×
W - Acquisition or disposition by will or laws×
Z - Deposit into or withdrawal from voting trust×
J - Other acquisition or disposition×
K - Transaction in equity swap or similar instrument×
U - Disposition due to a tender of shares in a change of control transaction×
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