Masimo Corporation

MASINASDAQHealthcare● Active

$179.95

+$1.13(+0.63%)

Market Cap$9.4B

P/E Ratio—

52W High$179.955

52W Low$125.94

Avg Volume1.2M

Open$179.93

Beta1.10

Insider Trades Ownership Employees

Masimo Corporation (MASI) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · MASI · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.50

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 33%Active transactions only · RSU vesting excluded67% Sell ↓

Masimo Corporation insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

MASI insider buying and selling by quarter

MASI insider selling · MASI insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

427K214K0

2024 Q2

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · MASI ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

MASI executive sell shares · MASI board member insider trading · MASI insider trading SEC filing

Showing 43 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Apr 29, 2026	Scannell Timothy J Director	Option	1,225	—	—	2,608	Form 4
Apr 29, 2026	LANE WENDY E Director	Option	1,225	—	—	2,608	Form 4
Apr 29, 2026	Brennan Michelle Director	Option	1,225	—	—	8,543	Form 4
Apr 21, 2026	Hellmann Elisabeth A Chief Human Resources Officer	Option	335	—	—	335	Form 4
Apr 21, 2026	Hellmann Elisabeth A Chief Human Resources Officer	Other	121	$178.43	$22K	214	Form 4
Mar 11, 2026	Szyman Catherine M. CEO · Director	Option	2,101	—	—	8,674	Form 4
Mar 11, 2026	Szyman Catherine M. CEO · Director	Other	1,069	$175.47	$188K	7,605	Form 4
Mar 11, 2026	Young Micah W EVP & Chief Financial Officer	Option	873	—	—	26,127	Form 4
Mar 11, 2026	Young Micah W EVP & Chief Financial Officer	Other	471	$175.47	$83K	25,656	Form 4
Feb 27, 2026	Young Micah W EVP & Chief Financial Officer	Award	15,000	—	—	33,347	Form 4
Feb 27, 2026	Young Micah W EVP & Chief Financial Officer	Other	8,093	$175.35	$1.42M⚡	25,254	Form 4
Feb 26, 2026	Young Micah W EVP & Chief Financial Officer	Award	2,034	—	—	19,470	Form 4
Feb 26, 2026	Young Micah W EVP & Chief Financial Officer	Other	1,123	$175.22	$197K	18,347	Form 4
Feb 12, 2026	Szyman Catherine M. CEO · Director	Option	11,141	$132.96	$1.48M⚡	11,141	Form 4
Feb 12, 2026	Szyman Catherine M. CEO · Director	Other	4,568	—	—	6,573	Form 4
Jan 28, 2026	Sampath Anand EVP, Ops & Clinical Research	Option	30,000	$37.84	$1.14M⚡	59,589	Form 4
Jan 28, 2026	Sampath Anand EVP, Ops & Clinical Research	Sale	11,924	$136.56	$1.63M⚡	47,665	Form 4
Jan 28, 2026	Sampath Anand EVP, Ops & Clinical Research	Sale	6,560	$137.22	$900K	41,105	Form 4
Jan 28, 2026	Sampath Anand EVP, Ops & Clinical Research	Sale	196	$138.09	$27K	40,909	Form 4
Nov 13, 2025	Ahmed Omar CTIO & EVP of Engineering	Option	2,474	$152.43	$377K	4,242	Form 4
Nov 13, 2025	Ahmed Omar CTIO & EVP of Engineering	Other	974	—	—	3,268	Form 4
Sep 23, 2025	Tripodi Blair COO, Consumer Division	Option	15,000	$142.13	$2.13M⚡	21,896	Form 4
Sep 23, 2025	Tripodi Blair COO, Consumer Division	Other	8,078	—	—	13,818	Form 4
Aug 13, 2025	Brennan Michelle Director	Purchase	100	$155.25	$16K	7,318	Form 4
Aug 12, 2025	Brennan Michelle Director	Purchase	100	$150.35	$15K	7,218	Form 4

Scannell Timothy J

Director

Option

Date

Apr 29

1,225

Price

—

Value

—

View Form 4 on SEC.gov

LANE WENDY E

Director

Option

Date

Apr 29

1,225

Price

—

Value

—

View Form 4 on SEC.gov

Brennan Michelle

Director

Option

Date

Apr 29

1,225

Price

—

Value

—

View Form 4 on SEC.gov

Hellmann Elisabeth A

Chief Human Resources Officer

Option

Date

Apr 21

335

Price

—

Value

—

View Form 4 on SEC.gov

Hellmann Elisabeth A

Chief Human Resources Officer

Other

Date

Apr 21

121

Price

$178.43

Value

$22K

View Form 4 on SEC.gov

Szyman Catherine M.

CEO · Director

Option

Date

Mar 11

2,101

Price

—

Value

—

View Form 4 on SEC.gov

Szyman Catherine M.

CEO · Director

Other

Date

Mar 11

1,069

Price

$175.47

Value

$188K

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Option

Date

Mar 11

873

Price

—

Value

—

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Other

Date

Mar 11

471

Price

$175.47

Value

$83K

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Award

Date

Feb 27

15,000

Price

—

Value

—

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Other

Date

Feb 27

8,093

Price

$175.35

Value

$1.42M ⚡

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Award

Date

Feb 26

2,034

Price

—

Value

—

View Form 4 on SEC.gov

Young Micah W

EVP & Chief Financial Officer

Other

Date

Feb 26

1,123

Price

$175.22

Value

$197K

View Form 4 on SEC.gov

Szyman Catherine M.

CEO · Director

Option

Date

Feb 12

11,141

Price

$132.96

Value

$1.48M ⚡

View Form 4 on SEC.gov

Szyman Catherine M.

CEO · Director

Other

Date

Feb 12

4,568

Price

—

Value

—

View Form 4 on SEC.gov

Sampath Anand

EVP, Ops & Clinical Research

Option

Date

Jan 28

30,000

Price

$37.84

Value

$1.14M ⚡

View Form 4 on SEC.gov

Sampath Anand

EVP, Ops & Clinical Research

Sale

Date

Jan 28

11,924

Price

$136.56

Value

$1.63M ⚡

View Form 4 on SEC.gov

Sampath Anand

EVP, Ops & Clinical Research

Sale

Date

Jan 28

6,560

Price

$137.22

Value

$900K

View Form 4 on SEC.gov

Sampath Anand

EVP, Ops & Clinical Research

Sale

Date

Jan 28

196

Price

$138.09

Value

$27K

View Form 4 on SEC.gov

Ahmed Omar

CTIO & EVP of Engineering

Option

Date

Nov 13

2,474

Price

$152.43

Value

$377K

View Form 4 on SEC.gov

Ahmed Omar

CTIO & EVP of Engineering

Other

Date

Nov 13

974

Price

—

Value

—

View Form 4 on SEC.gov

Tripodi Blair

COO, Consumer Division

Option

Date

Sep 23

15,000

Price

$142.13

Value

$2.13M ⚡

View Form 4 on SEC.gov

Tripodi Blair

COO, Consumer Division

Other

Date

Sep 23

8,078

Price

—

Value

—

View Form 4 on SEC.gov

Brennan Michelle

Director

Purchase

Date

Aug 13

100

Price

$155.25

Value

$16K

View Form 4 on SEC.gov

Brennan Michelle

Director

Purchase

Date

Aug 12

100

Price

$150.35

Value

$15K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About MASI insider trading

MASI insider trades

Masimo Corporation (MASI) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Young Micah W (EVP & Chief Financial Officer), Szyman Catherine M. (CEO · Director), Sampath Anand (EVP, Ops & Clinical Research). Over the past 12 months, 5 insiders have filed transactions with the SEC. MASI insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Masimo Corporation's institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

MASI insider trading · 5 questions

The insiders of Masimo Corporation (MASI) include executives and directors such as Young Micah W (EVP & Chief Financial Officer), Szyman Catherine M. (CEO · Director), Sampath Anand (EVP, Ops & Clinical Research), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

MASI board member insider tradingwho are MASI insidersMASI insider rosterMasimo Corporation executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026