It's in the bag. Roche has officially acquired 70.5 percent of Ventana's shares, enough to wrap up the acquisition. But Roche has extended its $3.4 billion tender offer to February 15 in an attempt to nab more shares, because if it can boost that percentage above 90, the closing will be easier to manage. Last month, Roche upped its offer to $89.50 per share from $75. Report