Short sales accounted for 50% of total volume on May 16, 70% on May 17 and 59% of total volume today ! This could be an attempt to kill May call options having strike price of 27 and above, or maybe just a coincident and the shorts know something we don't. Anyway, IMO, the shorts could not possibly have insider's info at all 7 bidders. So, even 1 or 2 bidders dropping out doesn't really matter much. IMO, AstraZeneca probably is willing to make the highest bid to acquire AMLN pipeline due to its level of desperation.