After-hours buzz: CBS, Gap, GrubHub & more

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An employee folds clothes at a Gap store on February 20, 2014 in San Francisco, California.

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

CBS - The network reported first-quarter earnings per share of 78 cents on $3.86 billion in revenue, versus estimated EPS of 74 cents on $3.91 billion in sales. Its shares declined in after-hours trading.

Gap - The clothing retailer jumped in after-hours trading after tallying a 9 percent rise in same-store sales in April. It also offered first-quarter EPS guidance above estimates.

GrubHub - The online food delivery site reported first-quarter earnings per share of 6 cents on $59 million in revenue, versus estimates of EPS of 3 cents on $53 million in sales. Its shares rose in after-hours trade.

Jazz Pharmaceuticals - The biopharmaceutical company offered full-year guidance below expectations, with its shares falling.

Monster Beverage - The drink provider reported first-quarter earnings per share of 55 cents on $536 million in revenue, versus estimates of an EPS of 49 cents on $542 million in sales. Its shares gained in after-hours trading.

News Corp. - The media conglomerate posted third-quarter earnings per share of 11 cents, excluding items, on $2.08 billion in revenue. Analysts had estimated EPS of 3 cents on $2.07 billion in sales. Its shares edged higher in after-hours trade.

Rocket Fuel - The digital advertising company reported a first-quarter earnings per share loss of 33 cents on $74.4 million in revenue, compared to analysts' expectations of an EPS loss of 30 cents on $76 million in sales. Its shares dropped in after-hours trade.

Symantec - The security software maker tallied fourth-quarter earnings per share of 47 cents, excluding items, on $1.63 billion in revenue, versus estimates of an EPS of 42 cents on $1.65 billion in sales. It offered first-quarter guidance that was light on the bottom line and a bit better on the top. Its shares rose in after-hours trade.

—By CNBC's Kate Gibson

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