Deals

Ariad Shares Rise Amid Speculation of Potential Buyout

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Ariad Pharmaceuticals Inc., a takeover target last year before talks failed over the price, rose the most in a month on speculation that the drugmaker may be a buyout candidate yet again.

Posts on Twitter suggested that Ariad, a Cambridge, Massachusetts-based company developing oncology drugs, is a takeout target that would command a large premium. The shares climbed 6.5 percent to $12.90 at 3:24 p.m.