The top after-market NYSE gainers Tuesday were Williams-Sonoma, La-Z-Boy Inc, Express, Inc, GenOn Energy and Pioneer Energy Services Corp. The top after-market NYSE losers were Qihoo 360 Technology, EnCana, Beazer Homes, Tim Hortons and Agrium Inc.

Gainers

Williams-Sonoma, Inc. (WSM) shares climbed 9.08 percent to $41.70 in post-market trading after raising its full-year earnings guidance. The company expects fiscal 2012 adjusted earnings to be in a range of $2.44 to $2.51 per share, up from its prior estimate of $2.42 to $2.49 per share and also topped analysts' expectation of $2.50 per share.

La-Z-Boy Inc. (LZB) shares surged 6.67 percent to $14.40 in post-market trading. The company reported first quarter net income of $4.4 million or $0.08 per share, down from $45.5 million or $0.85 per share but in line with Reuters' estimate of $0.08 per share. Revenue was $301.5 million compared to 280 million last year and also topped analysts' estimate of $290.48 million.

Express, Inc. (EXPR) shares surged 3.55 percent to $17.50 in post-market trading. The stock has a 52-week low of $15.34, a 52-week high of $26.27 and $1.51 billion in market capitalization.

GenOn Energy, Inc. (GEN) shares gained 2.84 percent to $2.66 in post-market trading.

Pioneer Energy Services Corp. (PES) shares rose 2.52 percent to $8.13 in post-market trading. Analysts' at Goldman Sachs reiterated "buy" rating on shares of Pioneer Energy Services.

Losers:

Qihoo 360 Technology Co. Ltd. (QIHU) shares plunged 2.37 percent to $20.60 in post-market trading. Its second quarter net profit declined to $7.0 million or $0.06 per American Depositary Share (ADS) from $11.1 million or $0.09 per ADS in the same period last year.

EnCana Corp. (ECA) shares fell 2.23 percent to $21.73 in post-market trading. The company stock was downgraded to "sell" rating from "hold" rating at Societe Generale.

Beazer Homes USA, Inc. (BZH) shares fell 2.12 percent to $2.83 in post-market trading.

Tim Hortons Inc. (THI) shares declined 2.11 percent to $50.13 in post-market trading. The stock has a 52-week low of $44.59, a 52-week high of $58.47 and $7.93 billion in market capitalization.

Agrium Inc. (AGU) shares fell 1.97 percent to $96.94 in post-market trading.