Jack H. Kessler, Chief Scientific Officer at SYMBOLLON CORP (SYMBA), bought 60,000 shares at $0.70 ($42K) on 2007-11-30, disclosed to the SEC on 2007-12-04.
Open-market purchase of $42k SYMBA by Chief Scientific Officer. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Nothing distinguishes this filing.