Major Movers on June 24; VHS, THC, ISIS, STEC, KEYN, AGN, DE

Shares of Vanguard Health Systems Inc. (NYSE: VHS) rallied more than 65% by afternoon trade on Monday. The hospital services provider, Tenet Healthcare Corp. (NYSE: THC) agreed to buy Vanguard Systems in a transaction valued at $1.63 billion. The acquisition will help Tenet to diversify its healthcare service business.

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