The top after-market NYSE gainers Monday were China New Borun, Harte-Hanks, Oasis Petroleum, Giant Interactive Group and Pilgrim's Pride Corp. The top after-market NYSE losers were Elan Corp, Heckmann Corp, Duff & Phelps, Eagle Materials and STERIS Corp.

Gainers

China New Borun Corp. (BORN) shares climbed 12.38 percent to $2.27 in post-market trading as its second quarter earnings topped estimates. The company reported the second quarter net profit of RMB2.65 per share on revenues of RMB803.7 million, above analysts' estimate of RMB2.48 per share on revenues of RMB748.44 million.

Harte-Hanks, Inc. (HHS) shares surged 4.49 percent to $6.52 in post-market trading. The company stock plunged more than 4 percent in regular trading.

Oasis Petroleum Inc. (OAS) shares surged 3.97 percent to $27.74 in post-market trading. Its second quarter net profit surged to $76.04 million or $0.82 per share from $33.35 million or $0.36 per share in the same period last year and also topped analysts' estimate of $0.29 per share.

Giant Interactive Group Inc. (GA) shares surged 3.83 percent to $4.88 in post-market trading. The company reported the second quarter adjusted net profit of RMB1.40 or $0.22 per ADS, up from RMB1.17 per ADS in the same period last year.

Pilgrim's Pride Corp. (PPC) shares gained 3.63 percent to $4.71 in post-market trading. The stock has a 52-week low of $2.90, a 52-week high of $8.68 and $1.18 billion in market capitalization.

Losers

Elan Corp, Plc (ELN) shares slumped 12.09 percent to $9.89 in post-market trading. The company announced Monday that Johnson & Johnson has issued a press release regarding the discontinuation of Phase 3 development of bapineuzumab IV in mild to moderate Alzheimer's disease, after a second clinical trial failed. Elan has nearly 50 percent stake in Janssen Alzheimer Immunotherapy.

Heckmann Corp. (HEK) shares slumped 8.28 percent to $3.10 in post-market trading. The company reported the second quarter net income of $10.7 million or $0.07 per share, up from $0.3 million or breakeven per share in the same period last year. Revenues climbed to $90.8 million from $39.2 million last year but fell short of Reuters' estimate of $98.86 million.

Duff & Phelps Corp. (DUF) stock slumped 7.07 percent to $13.68 in post-market trading. The company announced the commencement of an underwritten public offering of 3,000,000 shares of its common stock by certain selling stockholders, including 1,794,556 shares of common stock being sold by Vestar Capital Partners and its affiliates and 1,205,444 shares of common stock being sold by Shinsei Bank, Limited.

Eagle Materials Inc. (EXP) shares plunged 3.86 percent to $38.07 in post-market trading. The company stock surged more than 4 percent in regular trading.

STERIS Corp. (STE) shares plunged 3.60 percent to $32.36 in post-market trading. The stock has a 52-week low of $27.08, a 52-week high of $33.97 and $1.95 billion in market capitalization.