Because they can, who is they, probably a financial institution. Manuso had stated he was looking for some tpye of deal for the past few years. Manuso has probably meet with institutional manager in the past few years conveying his thoughts and when the deal was stuck it was sell on the news. Why ? Because they(astex,supg) have no real catalyst going forward for awhile. Earnings was just a benefit in propping up the stock for the fall. Now we must suck wind and wait.