Roberto Ruiz, Chief Operating Officer at CLEARSIGN COMBUSTION CORP (CLIR), bought 1,000 shares at $3.19 ($3K) on 2017-08-18, disclosed to the SEC on 2017-08-21.
Open-market purchase of $3k CLIR by Chief Operating Officer. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history). Context: insider career grade C.
Something here stands out, but not much.
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