The top after-market NASDAQ Stock Market gainers are: Red Robin Gourmet Burgers, Opnext, BioSante Pharmaceuticals, Stratasys, STEC, and Zumiez. The top after-market NASDAQ Stock Market losers are: Popular, Abaxis, Nordson, Stamps.com, CEVA, and Immunogen.

Gainers

Red Robin Gourmet Burgers Inc. (RRGB) stock jumped 10.80 percent to $31.60 in the after-market trading. Adjusted earnings for the first quarter was $9.02 million or $0.58 per share, higher than $2.31 million or $0.15 per share last year. Revenue rose to $286.83 million from $275.51 million. Analysts had expected a profit of $0.25 per share on revenue of $283.49 million. Comparable restaurant sales increased 1.9 percent for company-owned restaurants. Comparable sales for franchise restaurants in the U.S. increased 2.5 percent and for franchise restaurants in Canada decreased 1.2 percent.

Opnext, Inc. (OPXT) stock climbed 9.63 percent to $2.05 in the after-market trading. Profit for the fourth quarter was $9.04 million or $0.10 per share, compared to a loss of $18.30 million or $0.20 last year. The latest quarter results included a $21.4 million gain on sale of technology assets net of costs directly associated with the transaction. Adjusted loss narrowed to $8.75 million or $0.10 per share from $14.52 million or $0.16 per share. Revenue rose to $95.35 million from $76.78 million. Analysts had expected a loss of $0.09 per share on revenue of $96.27 million. For the first quarter, the company expects revenue of $93 million to $97 million, while Street predicts $95.85 million.

BioSante Pharmaceuticals, Inc. (BPAX) stock fell 7.39 percent to $2.63 in the after-market trading.

Stratasys Inc. (SSYS) stock grew 5.45 percent to $38.35 in the after-market trading.

STEC, Inc. (STEC) stock gained 4.79 percent to $15.43 in the after-market trading.

Zumiez, Inc. (ZUMZ) stock increased 3.46 percent to $27.20 in the after-market trading. Profit for the first quarter was $1.9 million or $0.06 per share, compared to a loss of $1.9 million or $0.06 per share last year. The results for last year's quarter included costs of about $1.2 million or $0.03 per share associated with the relocation of the company's distribution center from Everett, Washington to Corona, California. Sales grew 18.8 percent to $105.9 million. Analysts had expected a profit of $0.02 per share on revenue of $105.36 million. Comparable store sales increased 12.6 percent.

Zumiez expects second quarter earnings of $0.02 to $0.04 per share, while Street predicts $0.04 per share. The earnings guidance is based on an anticipated comparable store sales increase in the mid single digit range for the second quarter. The company currently plans to open nearly 44 new stores in fiscal 2011, including its first store in Canada.

Losers

Popular Inc. (BPOP) stock fell 7.59 percent to $2.80 in the after-market trading. The company said Banco Popular de Puerto Rico, its principal banking subsidiary, and a financial group led by an unrelated real estate investment and asset management firm had terminated negotiations regarding the sale by Banco Popular de Puerto Rico of a portfolio of non-performing construction and commercial real estate loans to a new joint venture entity to be sponsored by the financial group.

The negotiations were terminated as a result of the parties being unable to agree on the final terms and conditions of the definitive documentation, the company said. On January 31, Popular had announced the execution of a non-binding letter of intent regarding this transaction. The company said it would continue to explore other opportunities to sell these assets in one or more transactions, as well as internal strategies to maximize its recoveries.

Abaxis Inc. (ABAX) stock tumbled 6.82 percent to $29.30 in the after-market trading.

Nordson Corp. (NDSN) stock slid 5.81 percent to $51.25 in the after-market trading. The company expects third quarter earnings of $0.84 to $0.91 per share and sales of $315 million to $326 million, while Street predicts profit of $0.88 per share on revenue of $328.75 million. Nordson reported second quarter earnings of $65.2 million or $0.95 per share, up from $32.4 million or $0.47 per share last year. Sales grew 27 percent to $319.0 million. Analysts had expected profit of $0.88 per share on revenue of $319.96 million for the second quarter.

Stamps.com Inc. (STMP) stock declined 4.69 percent to $12.47 in the after-market trading.

CEVA Inc. (CEVA) stock decreased 4.32 percent to $29.45 in the after-market trading.

Immunogen Inc. (IMGN) stock declined 4.08 percent to $12.21 in the after-market trading. The company said it plans to offer shares of its common stock in an underwritten public offering. The offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering. Jefferies & Company, Inc. is acting as the sole book-running manager for the proposed offering and Oppenheimer & Co. Inc., RBC Capital Markets, LLC, William Blair & Company, LLC, Canaccord Genuity Inc. and Morgan Joseph TriArtisan LLC are acting as co-managers.