Allan R. Ferguson, Director at BIOPURE CORP (BPUR), bought 58,780 shares at $0.85 ($50K) on 2007-11-06, disclosed to the SEC on 2007-11-07.
Open-market purchase of $50k BPUR 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.