MASI insider buying
1 cluster buyMASIMO CORP · Healthcare
When two or more insiders at MASIMO CORP buy MASI on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in MASI plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- Aug 11 – Aug 13, 2025Detected Aug 13, 20252 insidersTotal bought$468.5KMarket cap$9.4B
All notable open-market buys in MASI
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Aug 13, 2025 | Brennan Michellecluster Director, Chairman of the Board | 100 | $155.25 | $15.5K | SEC ↗ |
| Aug 12, 2025 | Brennan Michellecluster Director, Chairman of the Board | 100 | $150.35 | $15.0K | SEC ↗ |
| Aug 11, 2025 | Jellison William Rcluster Director | 3,000 | $145.98 | $437.9K | SEC ↗ |
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MASI insider buying — FAQ
- Are insiders buying MASI stock?
- Yes — 2 distinct insiders have bought MASI (MASIMO CORP) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Aug 14, 2025.
- How much MASI stock have insiders bought?
- Insiders have bought a combined $468.5K of MASI across 3 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in MASI?
- A cluster buy is two or more distinct MASIMO CORP insiders — officers, directors, or 10% owners — each buying MASI on the open market within a rolling window. MASI has 1 detected cluster buy to date.
- Where does this MASI insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in MASI
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy MASI within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding MASI.