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SEC Form 4 · last 90 days
When several insiders buy at once, pay attention.
A single insider buying is noise as often as signal. A cluster buy— two or more different insiders buying the same stock on the open market within weeks of each other — is much harder to dismiss. Here's where it's happening now.
30
Active clusters
$115.89M
Total cluster buying
BLSM
BlossomHill Therapeutics, Inc.
6 insiders buying
$25.18M
Aug 7, 2026 – Aug 10, 2026
- GORDON CARL L · Director$10.00M
- ORBIMED ADVISORS LLC · Director$10.00M
- Chen Bihua · Insider$5.00M
- Schmid John P. · Insider$96K
- Liptak Vincent Paul · General Counsel$75K
- Keyes Jason A · Chief Financial Officer$11K
ACON
Aclarion, Inc.
6 insiders buying
$126K
Aug 13, 2026 – Aug 17, 2026
- Bond Ryan · Director$50K
- Gould Gregory A · CFO$25K
- Neal David K · Director$18K
- Williams Amanda M · Director$16K
- Ness Brent · Chief Executive Officer$12K
- Wesemann William · Director$5K
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A cluster buy counts distinct insiders (by SEC CIK) making open-market purchases (Form 4 transaction code P) of the same issuer within a 90-day window. Data is sourced from public SEC filings and is for informational purposes only — not investment advice. Cluster buying is one signal among many and does not guarantee future performance.