NASDAQ:MASI

Masimo Stock Insider Trading

Healthcare > Medical - Instruments & Supplies

Buy MASI

*Your capital is at risk

$179.95

+0 (+0%)

At Close: Jun 23, 2026

Masimo Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -90.94. In total, the insiders bought 565.68K and sold 5.43M MASI shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-90.94
● Buy	565.68K shares
● Sell	5.43M shares
41% Buy Activity Weak Negative Correlation
Sell Signal Medium Confidence Jun 10, 2026 Analysis Breakdown: Strongly supported by a very low Insider Power Score of -90.94. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Szyman Catherine M. Chief Executive Officer	CEO / President	18 617 Value: $3.10M
Jun 10, 2026 Sell	Common Stock D-Return	Szyman Catherine M. Chief Executive Officer	CEO / President	7 605 Value: $1.37M
Jun 10, 2026 Sell	Performance-Based Restricted Stock Unit D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	10 485 Value: $0
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	7 739 Value: $1.29M
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	11 954 Value: $1.51M
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	6 362 Value: $1.00M
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	6 633 Value: $1.19M
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Young Micah W EVP, Chief Financial Officer	C-Suite Officer	5 788 Value: $772.7K
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Dadswell Charles EVP, General Counsel	Officer	10 261 Value: $0
Jun 10, 2026 Sell	Performance-Based Restricted Stock Unit D-Return	Hellmann Elisabeth A Chief Human Resources Officer	Officer	4 020 Value: $0
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Hellmann Elisabeth A Chief Human Resources Officer	Officer	2 873 Value: $428.8K
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Hellmann Elisabeth A Chief Human Resources Officer	Officer	5 985 Value: $0
Jun 10, 2026 Sell	Common Stock D-Return	Hellmann Elisabeth A Chief Human Resources Officer	Officer	214 Value: $38.5K
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Sampath Anand EVP, Operations	Officer	7 235 Value: $965.9K
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Sampath Anand EVP, Operations	Officer	10 000 Value: $869.5K
Jun 10, 2026 Sell	Non-Qualified Stock Option (Right to Buy) D-Return	Sampath Anand EVP, Operations	Officer	10 000 Value: $908.7K
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Sampath Anand EVP, Operations	Officer	6 840 Value: $0
Jun 10, 2026 Sell	Common Stock D-Return	Sampath Anand EVP, Operations	Officer	33 901 Value: $6.10M
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Hataishi Paul SVP, Chief Accounting Officer	Officer	3 134 Value: $0
Jun 10, 2026 Sell	Common Stock D-Return	Hataishi Paul SVP, Chief Accounting Officer	Officer	13 317 Value: $2.40M
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Brennan Michelle Chairman Of The Board	CEO / President	1 119 Value: $0
Jun 10, 2026 Sell	Common Stock D-Return	Brennan Michelle Chairman Of The Board	CEO / President	9 309 Value: $1.68M
Jun 10, 2026 Sell	Restricted Stock Units D-Return	Politan Capital Management Lp Director By Deputization	Director	1 119 Value: $0
Jun 10, 2026 Sell	Common Stock D-Return	Politan Capital Management Lp Director By Deputization	Director	4 590 873 Value: $0.83B
Jun 10, 2026 Sell	Forward Sale Contract (obligation to sell) J-Other	Politan Capital Management Lp Director By Deputization	Director	130 869 Value: $0

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT MASIMO CORPORATION

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 t...

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