The de-lisitng was expected. The company had 6 months to come out of Chapter 11 (filed in September). Until the litigation is settled, SIGA has to stay under Court protection from creditors (PharmAthene). Thus, any funds who are restricted from owning an OTC/Chapter 11 stock probably already sold. US Gov will do business but would impose terms to protect itself. The real risk is that the Chapter 11 turns into a Chapter 7 (liquidation) if SIGA loses in the SC.