The top after-market NASDAQ Stock Market gainers are: QuinStreet, JDS Uniphase, NuVasive, S1 Corp., Whole Foods Market, Hansen Medical, Finisar, Spreadtrum Communications, Team, and Cepheid.

QuinStreet, Inc. (QNST) stock jumped 14.97 percent to $20.50 in the after-market trading. Profit for the third quarter was $6.34 million or $0.13 per share, up from $3.80 million or $0.11 per share last year. Adjusted earnings were $12.6 million or $0.25 per share. Revenue rose to $107.71 million from $90.77 million. Analysts had expected profit of $0.25 per share on revenue of $109.84 million. The company still expects that it would be able to meet its objective to grow revenue an average of 15 percent to 20 percent per year.

JDS Uniphase Corp. (JDSU) stock climbed 9.25 percent to $21.85 in the after-market trading, as its third quarter earnings and revenue exceeded Street view. Adjusted profit was $51.0 million or $0.22 per share, up from $23.2 million or $0.10 per share last year. Revenue grew to $454 million from $332.3 million, while adjusted revenue rose to $455.4 million from $332.9 million. Analysts had expected profit of $0.20 per share on revenue of $448.01 million. For the fourth quarter, the company expects adjusted revenue of $455 million to $475 million, while Street predicts $469.82 million.

NuVasive, Inc. (NUVA) stock grew 6.21 percent to $32.50 in the after-market trading, as it increased its full year 2011 earnings and revenue guidance above Street view. The company raised its 2011 adjusted earnings guidance to range of $1.20 to $1.23 per share from previous forecast of $1.07 to $1.10 per share. The company also lifted its revenue outlook to range of $530 million to $540 million from previous range of $525 million to $535 million. Street analysts predict profit of $1.09 per share on revenue of $530.61 million.

NuVasive reported first quarter earnings of $2.36 million or $0.06 per share, up from $1.09 million or $0.03 per share last year. Adjusted profit rose to $9.52 million or $0.24 per share from $8.3 million or $0.21 per share. Revenue grew 14.1 percent to $124.47 million. Analysts had expected earnings of $0.19 per share on revenue of $123.14 million.

S1 Corp. (SONE) stock gained 5.45 percent to $6.97 in the after-market trading. Profit for the first quarter was $682,000 or $0.01 per share, compared to a loss of $1.06 million or $0.02 per share last year. The latest quarter results included stock-based compensation expense of $0.8 million. Adjusted cash earnings were $0.04 per share, compared to a loss of $0.01 per share last year. Revenue rose to $57.84 million from $51.16 million. Analysts had expected a loss of $0.01 per share on revenue of $52.82 million.

The company raised its full year 2011 revenue guidance to range of $230 million to $240 million from previous forecast of $225 million to $235 million, while Street predicts $226.85 million. The company also increased its adjusted EBITDA outlook to range of $24 million to $28 million from previous range of $22 million to $27 million. We got off to a good start in 2011. In addition to adding nine new customers in the first quarter, we had a very strong quarter of cross-sales into our existing customer base. With the shift in our business model largely behind us and the significant sales opportunities we continue to see around the world, we are raising our 2011 financial guidance, said Johann Dreyer, Chief Executive Officer of S1 Corp.

Whole Foods Market, Inc. (WFMI) stock increased 5.42 percent to $62.98 in the after-market trading, as it raised its fiscal 2011 earnings and sales guidance based on its strong second quarter results. The company increased its fiscal 2011 earnings guidance to range of $1.87 to $1.90 per share from previous forecast of $1.76 to $1.80 per share. The company narrowed its 2011 sales growth outlook to range of 11.7 percent to 12.6 percent from previous range of 10.7 percent to 12.8 percent. Street analysts predict profit of $1.80 per share on revenue of $10.11 billion with sales growth of 12.30 percent.

The company reported its second quarter earnings of $89.9 million or $0.51 per share, up from $67.5 million or $0.39 per share last year. Sales grew 12 percent to $2.4 billion. Analysts had expected profit of $0.46 per share on revenue of $2.37 billion. Both comparable, as well as identical store sales grew by 7.8 percent over last year. On a two-year stacked basis, comparable store sales rose 16.5 percent, while identical store sales were up 15.5 percent, including a negative impact of 50 basis points from the Easter shift. Further, Whole Foods said it will change its trading symbol to WFM from WFMI, effective May 6, 2011.

Hansen Medical, Inc. (HNSN) stock rose 5.23 percent to $3.22 in the after-market trading. Profit for the first quarter was $11.7 million or $0.21 per share, compared to a loss of $3.8 million or $0.10 per share last year. The 2011 first quarter net income was primarily attributable to about $23 million gain on sale of the non-robotic rights associated with the FOSSL technology. Revenue grew 95 percent to $5.3 million. Analysts had expected a loss of $0.19 per share on revenue of $4.63 million.

Finisar Corp. (FNSR) stock gained 4.94 percent to $26.56 in the after-market trading.

Spreadtrum Communications Inc. (SPRD) stock increased 4.66 percent to $22.25 in the after-market trading, ahead of its first quarter earnings release. Analysts are expecting Spreadtrum to earn $0.45 per share on revenue of $132.33 million for the first quarter.

Team Inc. (TISI) stock rose 4.18 percent to $22.92 in the after-market trading.

Cepheid (CPHD) stock moved up 4.07 percent to $31.22 in the after-market trading.