Morning Market Movers

STEC STEC rose 86.91% to $6.71 after Western Digital WDC announced its plans to buy STEC for around $340 million. Vanguard Health Systems VHS jumped 64.70% to $20.67 after Tenet Healthcare THC announced its plans to acquire the company for $4.3 billion including debt. Keynote Systems KEYN moved up 46.45% to $19.79 after the company agreed to be acquired by Thoma Bravo for $20.00 per share. SORL Auto Parts SORL shares jumped 12.45% to $2.98. SORL's PEG ratio is 0.89.