The top after-market NYSE gainers Monday were Accretive Health, Lexmark International, Herbalife Ltd, Hertz Global Holdings and Freescale Semiconductor Ltd. The top after-market NYSE losers were RealD, Forest Oil Corp, McMoRan Exploration, Superior Energy Services and Humana Inc.

Gainers:

Accretive Health Inc. (AH) shares climbed 22.38 percent to $12.25 in post-market trading. The company announced Monday that it has entered into an agreement to settle the allegations brought against it by the Minnesota State Attorney General earlier this year following the theft of a laptop, from which no patient data was accessed.

Lexmark International Inc. (LXK) shares climbed 11.23 percent to $19.31 in post-market trading. The stock has a 52-week low of $16.10, a 52-week high of $38.34 and $1.23 billion in market capitalization.

Herbalife Ltd. (HLF) shares surged 6 percent to $54.79 in post-market trading. Its second quarter net profit rose to $133.37 million or $1.10 per share from $111.18 million or $0.88 per share in the same quarter last year and also topped the Reuters' estimate of $0.96 per share. The company also raised its fiscal 2012 earnings guidance to a range of $3.88 to 3.98 per share from its prior estimate of $3.58 to $3.74 per share.

Hertz Global Holdings Inc. (HTZ) shares surged 3.48 percent to $11.90 in post-market trading. The company reported a second quarter net profit of $92.9 million or $0.21 per share, up from $55.0 million or $0.12 per share in the same quarter a year earlier.

Freescale Semiconductor Ltd. (FSL) shares gained 3.07 percent to $10.56 in post-market trading. The company stock plunged more than 6 percent in regular trading.

Losers:

RealD (RLD) shares tumbled 19.76 percent to $10.11 in post-market trading. The company reported first quarter net income of 3.0 million or $0.05 per share, sharply lower from $9.6 million or $0.17 per share in the same quarter last year and also widely missed the analysts’ estimate of $0.15 per share.

Forest Oil Corp. (FST) shares slumped 9.35 percent to $6.40 in post-market trading. The company reported second quarter adjusted net profit of $0.06 per shares, sharply lower from $0.25 per share in the same quarter last year.

McMoRan Exploration Co. (MMR) shares slumped 9.20 percent to $12.54 in post-market trading. The stock has a 52-week low of $7.76, a 52-week high of $17.24 and $2.23 billion in market capitalization.

Superior Energy Services Inc. (SPN) shares plunged 9.05 percent to $21.20 in post-market trading after lowering the full year earnings guidance. The company currently expects fiscal 2012 adjusted net profit to be in the range of $2.75 to $3.05 per share, down from its prior estimate of $3.30 to $3.60 per share and also missing the analysts’ estimate of $3.08 per share.

Humana Inc. (HUM) shares plunged 8.86 percent to $64.30 in post-market trading. Its second quarter net profit declined to 356 million or $2.16 per share from $460 million or $2.71 per share in the same quarter last year and also fell short of the analysts’ estimate of $2.28 per share.

Nyse Attorney general