Check out which companies are making headlines after the bell Wednesday:
Whole Foods - The retailer handed in fiscal third-quarter earnings that beat analysts' expectations, but shares plunged as revenue and comparable-store sales trailed Wall Street estimates.
Yelp - Shares of the consumer review website rose after it reported second-quarter earnings of 4 cents per share—its first quarterly profit as a public company—on revenue of $89 million, topping expectations as the number of unique monthly visitors rose significantly.
Weight Watchers - The stock soared after the maker of dieting products reported better-than-expected quarterly earnings and revenue. The company also raised its full-year fiscal 2014 earnings guidance.
Akamai Technologies - The cloud computing firm beat earnings expectations by 3 cents and reported quarterly revenue of $476 million, topping estimates of $473 million. But shares dropped in after-hours trading.
Kraft Foods - Shares were modestly lower after the food producer missed estimates on the top and bottom line as the company battles with rising input costs.
Vistaprint - The stock rallied more than 17 percent after the online printing company beat analysts estimates as fiscal fourth-quarter revenue climbed 21 percent year over year.
—By CNBC's Karma Allen
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