The top after-market NASDAQ gainers Tuesday were: Mattress Firm Holding Corp, Standard Microsystems Corp, Century Aluminum, Spectrum Pharmaceuticals, NXP Semiconductors, Smith & Wesson Holding Corp, L&L Energy, James River Coal Co, Activision Blizzard and NutriSystem Inc.

Mattress Firm Holding Corp. (MFRM) stock climbed 16.86 percent to $43.74 in aftermarket session. The company swung to fourth quarter net profit of $17.4 million or $0.56 per share compared to net loss of $1.63 million or $0.07 per share in the same period a year-ago, while analysts’’ expected net income of $0.19 per share.

For the full year, the company expects net profit to be in a range of $1.40 to $1.48 per share on revenues of $1.03 to $1.06 billion, while analysts’’ expect net profit of $1.37 per share on revenues of $879.91 million.

Standard Microsystems Corp. (SMSC) stock surged 5.24 percent to $25.50 in aftermarket session. The company reporte4d adjusted net income of $1.1 million or $0.05 per share compared to $6 million or $0.26 per share in the same period last year, while analysts’ expected the company to report net loss of $0.17 per share for the fourth quarter.

For the first quarter, the company expects net income to be in a range of $0.29 to $0.38 per share on revenues of $98 to $102 million, while analysts’ expect net profit of $0.27 per share on revenues of $97.96 million.

Century Aluminum Co. (CENX) stock surged 4.77 percent to $8.35 in aftermarket session.

Spectrum Pharmaceuticals, Inc. (SPPI) stock surged 4.57 percent to $10.29 in aftermarket session. The company stock plunged more than 5 percent in regular session.

NXP Semiconductors NV (NXPI) stock advanced 3.88 percent to $24.63 in post market session. The stock has a 52-week low of $13.06, a 52-week high of $35.32 and $5.97 billion in market capitalization.

Smith & Wesson Holding Corp. (SWHC) stock gained 3.61 percent to $7.75 in aftermarket session. The company stock slumped nearly 8 percent in regular session.

L&L Energy, Inc. (LLEN) stock rose 3.49 percent to $2.37 in post market trading. The company stock slumped more than 10 percent in regular session.

James River Coal Co. (JRCC) stock advanced 3.09 percent to $4.67 in aftermarket session.

Activision Blizzard, Inc. (ATVI) stock gained 3.05 percent to $12.75 in aftermarket session. The stock has a 52-week low of $10.40, a 52-week high of $14.40 and $13.89 billion in market capitalization.

NutriSystem Inc. (NTRI) stock advanced 2.71 percent to $11.00 in post market session. The company stock declined more than 3 percent in regular trade after it was downgraded to “sell” rating from “hold” rating at Oscar Gruss.