The top after-market NYSE gainers Monday were AM Castle, BPZ Resources, Fabrinet, Centene Corp and General Cable Corp. The top after-market NYSE losers were AK Steel Holding, Quiksilver, IAMGOLD Corp, Oasis Petroleum and NRG Energy.

Gainers

AM Castle & Co. (CAS) shares climbed 9.98 percent to $10.14 in post-market trading.

BPZ Resources, Inc. (BPZ) shares climbed 7.14 percent to $2.55 in post-market trading. The company stock slumped nearly 7 percent in regular trading.

Fabrinet (FN) shares surged 7.03 percent to $14.31 in post-market trading. The company reported fourth quarter adjusted net profit of $10.7 million or $0.31 per share, down from $17.5 million or $0.50 per share in the same quarter last year but topped analysts' estimate of $0.26 per share.

Centene Corp. (CNC) shares gained 4.79 percent to $41.81 in post-market trading. The stock has a 52-week low of $24.26, a 52-week high of $50.98 and $2.06 billion in market capitalization.

General Cable Corp. (BGC) shares advanced 3.63 percent to $29.09 in post-market trading. The company stock plunged more than 3 percent in regular trading.

Losers

AK Steel Holding Corp. (AKS) shares plunged 4.87 percent to $5.50 in post-market trading. The company stock surged nearly 5 percent in regular trading.

Quiksilver, Inc. (ZQK) shares plunged 3.95 percent to $2.92 in post-market trading. The stock has a 52-week low of $2.09, a 52-week high of $4.89 and $503.11 million in market capitalization.

IAMGOLD Corp. (IAG) shares plunged 3.57 percent to $11.86 in post-market trading. The stock has a 52-week low of $9.20, a 52-week high of $23.88 and $4.63 billion in market capitalization.

Oasis Petroleum Inc. (OAS) shares fell 3.52 percent to $29.61 in post-market trading.

NRG Energy, Inc. (NRG) shares declined 3.36 percent to $21.51 in post-market trading.