Adobe Systems Inc. ADBE gained more than 4 percent to $77.63 although the company didn't issue any news.
Roundy's Inc. RNDY shares were up more than 12 percent recently at $4.53 a share, after the Milwaukee-based supermarket chain beat fourth-quarter estimates.
Heritage Insurance Holdings Inc. HRTG jumped 7 percent to $21.40 a share on favorable fourth-quarter results.
Darling Ingredients Inc. DAR gained nearly 5 percent to $18.05 after the Irvine, Texas supplier of ingredients to the food, pet food and fertilizer industries beat quarterly expectations.
Weight Watchers International Inc. WTW gained 4 percent to $10.40. The company is off 47 percent since posting earnings last week.
Pernix Therapeutics Holdings Inc. PTX fell 6 percent a day after it made a presentation at a Cowen and Co. Health Care Conference in Boston.
EnerNOC Inc. ENOC and Senomyx Inc. SNMX each gained more than 6 percent in Wednesday's extended session to $11.89 and $4.55 a share, recouping earlier losses.
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