The top after-market NYSE gainers Monday were Calix, Inc, Nam Tai Electronics, Freescale Semiconductor, Harbinger Group and Northern Tier Energy LP. The top after-market NYSE losers were Palo Alto Networks, El Paso Pipeline Partners LP, Sun Communities, EnergySolutions Inc and General Growth Properties, Inc.

Gainers

Calix, Inc. (CALX) shares surged 3.84 percent to $5.68 in post-market trading. The company stock plunged more than 3 percent in regular trading.

Nam Tai Electronics, Inc. (NTE) shares surged 2.67 percent to $10.75 in post-market trading after climbing nearly 8 percent in regular trading.

Freescale Semiconductor, Ltd. (FSL) shares advanced 2.66 percent to $10.41 in post-market trading. The stock has a 52-week low of $8.43, a 52-week high of $17.84 and $2.52 billion in market capitalization.

Harbinger Group Inc. (HRG) shares rose 1.91 percent to $8.32 in post-market trading. The company stock plunged nearly 6 percent in regular trading.

Northern Tier Energy LP (NTI) shares rose 1.69 percent to $20.17 in post-market trading. The stock has a 52-week low of $13.00, a 52-week high of $20.95 and $1.82 billion in market capitalization.

Losers

Palo Alto Networks, Inc. (PANW) shares slumped 9.60 percent to $64.86 in post-market trading. Its fourth quarter net loss narrowed to $4.6 million or $0.18 per share from $6.0 million or $0.40 per share in the same quarter last year. Revenues for the quarter surged 88 percent to $75.6 million.

El Paso Pipeline Partners LP (EPB) shares plunged 4.17 percent to $34.00 in post-market trading. The stock has a 52-week low of $30.64, a 52-week high of $38.36 and $7.37 billion in market capitalization.

Sun Communities, Inc. (SUI) shares plunged 4.03 percent to $44.05 in post-market trading. The company announced Monday that it had commenced an underwritten public offering of 3,000,000 shares of its common stock.

EnergySolutions Inc. (ES) shares fell 3.72 percent to $2.59 in post-market trading.

General Growth Properties, Inc. (GGP) shares declined 3.54 percent to $19.87 in post-market trading. The company rejected investor Bill Ackman's call to put itself up for sale and said it plans to remain independent, Bloomberg reported.