OvaScience, Fred's, Weight Watchers Lead Wednesday's After-Hours Movers

Fred's Inc. FRED picked up 12 percent after hours Wednesday after closing down 3 percent. Earlier Wednesday, the company said it will pay $66 million in cash and notes to acquire privately held Reeves-Sain Drug Store Inc.

Silver Spring Networks Inc. SSNI shares gained nearly 12 percent in extended trading Wednesday, changing hands recently at $10.46. The company, which provides networking platforms to utilities, had closed down 8 percent earlier and didn't issue any news.

OvaScience Inc. OVAS picked up 10 percent in late trading, changing hands at $54.83 recently. The shares had closed down 8 percent earlier after the company slated an investors' conference call on short notice for Friday concerning its Augment prospective treatment for infertility.

Chimerix Inc. CMRX gained 10 percent in late trading, to $38.76. Its Chief Development Officer, Michael D. Rogers, acquired shares using his corporate-issued stock options, according to a filing Wednesday.

Relypsa Inc. RLYP gained 10 percent after hours to $37.29. At Wednesday's closing, the shares were off 15 percent in the past five trading days.

Lannett Co. LCI picked up 8 percent after hours to $69.75, after closing down more than 7 percent. The generic drug manufacturer didn't issue any news, but hit a 52-week high Tuesday.

Weight Watchers International Inc. WTW gained more than 6 percent, after losing 6 percent in the regular session. The company didn't issue any reasons.

Sucampo Pharmaceuticals Inc. SCMP fell 7 percent to $15.60, extending earlier losses. After the bell, the company said insiders will make a public offering.

Verint Systems Inc. VRNT lost more than 4 percent after hours, trading recently at $56. The data analytics company reduced its guidance after the bell.

TETRA Technologies Inc. TTI was up nearly 6 percent, after closing up by a similar percentage on no news.