MASS insider buying
1 cluster buy908 Devices Inc. · Healthcare
When two or more insiders at 908 Devices Inc. buy MASS 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 MASS 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
- May 14 – May 15, 2025Detected May 15, 2025High conviction2 insidersTotal bought$174.3KMarket cap$318.4M
All notable open-market buys in MASS
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 |
|---|---|---|---|---|---|
| May 15, 2025 | Knopp Kevin J.cluster Director, President and CEO | 15,000 | $4.44 | $66.6K | SEC ↗ |
| May 14, 2025 | Knopp Kevin J.cluster Director, President and CEO | 15,000 | $4.32 | $64.8K | SEC ↗ |
| May 14, 2025 | Spoto Markcluster Director | 7,000 | $4.30 | $30.1K | SEC ↗ |
| May 14, 2025 | Spoto Markcluster Director | 3,000 | $4.25 | $12.8K | SEC ↗ |
| May 13, 2024 | Director, President and CEO | 10,000 | $6.42 | $64.2K | SEC ↗ |
| May 10, 2024 | Director, President and CEO | 10,000 | $5.77 | $57.7K | SEC ↗ |
| May 9, 2024 | Director, President and CEO | 10,000 | $5.83 | $58.3K | SEC ↗ |
| May 8, 2024 | Director, President and CEO | 10,000 | $5.72 | $57.2K | SEC ↗ |
| May 7, 2024 | Director, President and CEO | 10,000 | $5.60 | $56.0K | SEC ↗ |
More Healthcare stocks with insider cluster buys
MASS insider buying — FAQ
- Are insiders buying MASS stock?
- Yes — 2 distinct insiders have bought MASS (908 Devices Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 19, 2025.
- How much MASS stock have insiders bought?
- Insiders have bought a combined $467.7K of MASS across 9 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in MASS?
- A cluster buy is two or more distinct 908 Devices Inc. insiders — officers, directors, or 10% owners — each buying MASS on the open market within a rolling window. MASS has 1 detected cluster buy to date.
- Where does this MASS 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 MASS
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 MASS 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 MASS.