CBU — Insider Trading Activity

Cluster buy signal. Multiple insiders independently writing personal checks for the same company’s stock is one of the stronger patterns in the Form 4 data — it usually reflects a shared view among people who see the numbers first that the shares are cheap. Historically, 3+ insider clusters have outperformed the broader market over the following 6–12 months. Who is buying. The most credible buyer in this window is a Director (< $100K), growing their stake by 39%. Overall credibility score: 18/100 (Low).

By the numbers. 3 insiders filed 3 open-market purchases at CBU over the window, 1,193 shares in all at an average of $63.09 a share, most recently on September 9, 2026. No insider sold CBU stock on the open market in that period.

How we read these filings — which transaction codes count, how the cluster and credibility thresholds are set, and what the signals have and haven’t predicted — is written up in the insider trading methodology.