After-Hours Movers Wednesday: Whole Foods Market Inc., Keurig Green Mountain Inc.

Zynga Inc. ZNGA gained more than 10 percent to $2.88 in late trading Wednesday after the San Francisco-based social game company posted higher-than-expected results and said it will fire 18 percent of its work force. Sequenom Inc. SQNM picked up more than 9 percent after hours, trading at $4.90. The life sciences company reported that it swung to a first-quarter net profit on a pooled patents agreement with Illumina Inc. ILMN, as well as improved margins and reduced operating expenses. Qorvo Inc. QRVO gained about 9 percent to $75.50. The radio frequency device and semiconductor company said quarterly revenue increased 46 percent from a year ago, adding that June quarter revenue will rise 5 percent sequentially. Vale SA VALE bounced up more than 8 percent to $8.86 in late trading. The Brazil-based metals and mining company had closed down sharply amid a broad sell-off on the São Paulo Stock Exchange. Groupon Inc. GRPN picked up about 8 percent in extended hours Wednesday, changing hands at $6.84. The company posted quarterly results Tuesday and closed down recently by about 7 percent. TransAct Technologies Inc. TACT rose more than 7 percent after the bell to $5.75. The provider of point-of-sale terminals said quarter revenue grew 19 percent. Chegg Inc. CHGG rose about 6 percent after the bell to $7.87. The electronic textbook provider posted quarterly revenue growth of 14 percent and offered an outlook for the second quarter. Nu Skin Enterprises Inc. NUS lost 12 percent in the after-hours session, trading at $52. The Provo, Utah-based direct marketer posted a 19 percent decline in first-quarter revenue. Whole Foods Market Inc. WFM declined more than 11 percent to $47.56 in late trading when the company posted a 3.6 percent increase in second-quarter same-store sales, including a 50 basis-point gain from a shift in the Easter holiday. Tetraphase Pharmaceuticals Inc. TTPH fell roughly 11 percent to $32.71 in the extended session. The development-stage stage biopharmaceutical company posted a wider first-quarter loss. Keurig Green Mountain Inc. GMCR slipped 11 percent after the coffee-machine maker posted lower-than-expected second-quarter revenue and named Peter G. Leemputte chief financial officer. Keurig said in November that CFO Frances G. Rathke would step down. Papa Murphy's Holdings Inc. FRSH declined 8 percent to $16.78. The Vancouver, Washington-based chain of about 1,400 pizza restaurants said full-year same-store sales growth will slow to about 3 percent, from 5.6 percent in the recent quarter.