This is no surprise, given the short-dated, out of the money call option volumes on March 6, 2009 -- the Friday before the March 9, 2009 announcement of a proposed reverse merger -- but this makes it official. Per The Wall Street Journal:
. . . .The Securities and Exchange Commission is investigating trading of Schering-Plough Corp. shares ahead of its announced merger with Merck & Co., people familiar with the matter said. . . .
Interesting. Who might have "tipped"? Who might have traded? We'll know pretty soon. At this point, there is no reason to suspect that any Schering-Plough employee is a target.