Masimo ($MASI) Insider Trading & Smart Money Activity

Masimo Corporation · Medical Devices · Latest filing May 15, 2026

Masimo Corporation ($MASI) has 2 13F position changes on file.

Insider buyers (12 mo): 0
Insider sellers (12 mo): 0
Net insider $ (12 mo): $0
Congress trades (12 mo): 0
13F moves on file: 2
Analyst ratings on file: 0

MASI insider buying and selling by quarter

Quarter	Congress buys / sales	13F added / cut
Q1 2026	0 / 0	0 / 0
Q2 2026	0 / 0	2 / 0
Q3 2026	0 / 0	0 / 0
Q4 2026	0 / 0	0 / 0

Insider buys and sales count open-market trades only (Form 4 codes P and S). Grants, option exercises and tax withholding are left out.

All MASI insider, congress, 13F and analyst activity

Date	Source	Who	Action	Shares	Value / amount	ΔOwn	1W	1M	6M	Filing	Story
May 15, 2026	13F	Pentwater Capital Management	New	+3.18M sh	$571.52M						Read
May 15, 2026	13F	Pentwater Capital Management	New	+3.18M sh	$571.52M						—

1W / 1M / 6M = how MASI moved from the trade or filing date.

Institutions moving MASI (13F)

Pentwater Capital Management2

Frequently asked questions

Which institutions changed their MASI positions?

Recent 13F filers moving the stock include Pentwater Capital Management.

Other medical devices stocks

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Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.

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