Brian Grant Fike, Interim CFO at CLEARSIGN COMBUSTION CORP (CLIR), bought 1,000 shares at $2.25 ($2K) on 2018-02-27, disclosed to the SEC on 2018-02-28.
Open-market purchase of $2k CLIR by Interim CFO. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Something here stands out, but not much.