Richard Earl Posthumus, Director at MERCANTILE BANK CORP (MBWM), bought 2,000 shares at $4.38 ($9K) on 2010-10-26, disclosed to the SEC on 2010-10-28.
Open-market purchase of $9k MBWM by Director. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Nothing distinguishes this filing.