UPS - The package delivery company tumbled after the company estimated second-quarter profit below analysts' expectations, hurt by overcapacity in the global air freight market and a slowing U.S. industrial economy. Rival FedEx also declined.
Athenahealth - The healthcare technology company surged after it struck a deal with Ascension Health Alliance to provide the health-care system with its Internet-based software for physicians. Analysts said the deal boosts Athenahealth's 2014 growth outlook. Shares shot up more than 15 percent.
Wendy's - BMO upgraded its rating on the fast-food chain to "outperform," saying it views the company "as a potential long-tailed sales growth and margin expansion turnaround story that could lead to a deleveraging balance sheet and accelerating earnings growth over a multi-year period." Shares soared more than 6 percent.
—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter:
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