Alexion Pharmaceuticals (
Alexion shares jumped 14% early in Friday's session, but later swung into negative territory and were down more than 3% on the day. ALXN was trading at $123.95 at last check, some 2.8% lower for the session.
The pharmaceuticals firm's shares initially rose after Alexion abruptly nixed an appearance at a conference. Of course, starting a takeout rumor when a company bows out of an investor conference is a staple of speculators' playbooks, and nine times out of ten, such rumors aren't true. But Alexion's stated reason for canceling...