Stocks to Watch: DELL, QSFT, GSK & More

Check out which companies are making headlines after the bell Thursday:

Dell , Quest Software - Dell is the "strategic bidder" that offered to buy Quest Software for about $2.15 billion in cash, according to a Reuters report, topping an initial offer by Insight Venture Partners. (Click here for extended-hours quotes.)

GlaxoSmithKline - The FDA approved the pharmaceutical giant's Menhibrix, a combination vaccine for children. (Click here for extended-hours quote.)

Dyax - The biopharmaceutical company announced it is halting a phase 2 study of its drug to treat a rare disease that causes swelling beneath the skin after the treatment failed to show significant improvement compared with a placebo. Shares plunged in extended-hours trading. (Click here for extended-hours quote.)

DTE Energy - The company boosted its quarterly dividend by 5.5 percent to 62 cents from 58 cents. (Click here for extended-hours quote.)

YPF Sociedad Anonima - Billionaire investor Carlos Slim disclosed an 8.4-percent stake in the company. Shares surged in extended-hours trading. (Click here for extended-hours quote.)

—By CNBC’s JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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