The top after-market NYSE gainers Wednesday were Ellie Mae, Yelp Inc, Digital Domain Media Group, MEMC Electronic Materials and Dice Holdings. The top after-market NYSE losers were Abercrombie & Fitch, Weight Watchers International, Stone Energy Corp, Boston Beer Co and Level 3 Communications, Inc.

Gainers

Ellie Mae, Inc. (ELLI) shares rallied 16.59 percent to $23.90 in post-market trading after raising its fiscal 2012 earnings guidance. Ellie Mae currently expects the fiscal 2012 adjusted net profit will be in the range of $0.68 to $0.72 per share on revenues of $90 to $91 million, up from its prior guidance of $0.42 to $0.45 per share on revenues of $78.0 to $79.0 million.

Yelp Inc. (YELP) shares climbed 14.77 percent to $21.60 in post-market trading as its third quarter and full year revenues forecast topped estimates. The company expects the third quarter revenue will be in the range of $34.5 to $35.5 million and full year revenue will be in a range of $135 to $136 million compared to Reuters' estimate of $34.30 million for the third quarter and $130.72 million for the fiscal year 2012.

Digital Domain Media Group, Inc. (DDMG) shares climbed 8.98 percent to $4.51 in post-market trading. The company formally announced its plans to evaluate a broad range of strategic and financial alternatives to support the company's growth initiatives and its efforts to maximize shareholder value.

MEMC Electronic Materials, Inc. (WFR) shares surged 8.04 percent to $2.15 in post-market trading. The stock has a 52-week low of $1.44, a 52-week high of $7.34 and $459.32 million in market capitalization.

Dice Holdings, Inc. (DHX) shares surged 6.72 percent to $7.94 in post-market trading. The company will replace Standard Microsystems Corp. (SMSC) in the S&P SmallCap 600 index after the close of trading Friday, August 3.

Losers

Abercrombie & Fitch Co. (ANF) shares tumbled 16.17 percent to $28.52 in post-market trading. The company expects the second quarter net profit will be in the range of $0.15 to $0.18 per share, widely missing analysts' estimate of $0.33 per share. Abercrombie & Fitch will release its second quarter results Wednesday, August 15.

Weight Watchers International Inc. (WTW) shares slumped 12.87 percent to $42.51 in post-market trading after lowering its full year earnings forecast. The company currently expects fiscal 2012 net profit to be in a range of $4.00 to $4.20 per share, down from its prior estimation of $4.60 to $4.80 per share and also fell short of analysts' estimate of $4.61 per share.

Stone Energy Corp. (SGY) shares slumped 8.62 percent to $24.07 in post-market trading. The company reported the second quarter net profit of $30.55 million or $0.62 per share, down from $57.20 million or $1.17 per share in the same period last year.

Boston Beer Co, Inc. (SAM) shares plunged 8.08 percent to $98.00 in post-market trading after reporting the second quarter earnings. Net profit was $14.4 million or $1.06 per share, sharply lower from $28 million or $2.01 per share in the same period last year and also fell short of Reuters' estimate of $1.28 per share.

Level 3 Communications, Inc. (LVLT) shares plunged 4.52 percent to $18.15 in post-market trading. The company announced Wednesday that Level 3 Financing, Inc., its wholly owned subsidiary, has agreed to sell $775 million aggregate principal amount of its 7 percent Senior Notes due 2020 in a private offering to "qualified institutional buyers."