Mark Martinelli, Director at CHAIN BRIDGE BANCORP INC (CBNA), bought 400 shares at $44.00 ($18K) on 2026-07-29, disclosed to the SEC on 2026-07-31.
Open-market purchase of $18k CBNA by Director. 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.