The top after-market NASDAQ Stock Market gainers are: SunPower, Netgear, LodgeNet Interactive, TeleNav, Skyworks Solutions, Silicon Motion Technology, Ancestry.com, On Assignment, and True Religion Apparel.

SunPower Corp. (SPWRB) stock jumped 39.10 percent to $21.95 in the after-market trading, while the company's class A shares (SPWRA) climbed 38.09 percent to $22.26. SunPower and Total Group said they reached a broad strategic relationship whereby Total Group would launch a friendly tender offer through its subsidiary for up to 60 percent of SunPower's outstanding Class A Common shares and 60 percent of SunPower's outstanding Class B Common shares at a price of $23.25 per share for each class.

The offer price represents a 46 percent premium over the April 27 closing price of SunPower's Class A common stock and a 49 percent premium over the April 27 closing price of SunPower's Class B common stock, and values SunPower's equity at $2.3 billion. In addition, Total would offer to guarantee an amount up to $1 billion of SunPower's repayment obligations with respect to letters of credit issued over the next five years in connection with SunPower's global utility power plant and large commercial installation businesses.

Following closing of the transaction, which has been approved by the boards of both companies, SunPower would continue to operate with its current management team. In addition, SunPower and Total have entered into an affiliation agreement whereby Total would nominate a majority of directors to SunPower's board of directors, which would be expanded to 11 members following the closing.

Netgear Inc. (NTGR) stock advanced 16.91 percent to $39.75 in the after-market trading, as its first quarter earnings and revenue exceeded Street view. Adjusted profit was $24.16 million or $0.65 per share, up from $17.06 million or $0.48 per share last year. Revenue rose to $278.8 million from $211.6 million. Analysts had expected a profit of $0.52 per share on revenue of $256.47 million.

Netgear expects second quarter revenue of $270 million to $280 million and adjusted operating margin of 11 percent to 12 percent, while Street analysts predicts revenue of $240.88 million. The company expects to roll out 17 new products in the second quarter.

Starting in the second quarter of 2011, the company's business will be managed in three specific business units: retail, commercial, and service provider. Each business unit will be managed by a Senior Vice President/General Manager. We believe this new structure will enable us to better focus our efforts on our core customer segments and allow us to be more nimble and opportunistic as a company overall, Netgear said in statement.

LodgeNet Interactive Corp. (LNET) stock surged 15.81 percent to $3.81 in the after-market trading.

TeleNav, Inc. (TNAV) stock soared 13.86 percent to $13.06 in the after-market trading, as it guided fourth quarter above Street view. The company expects fourth quarter adjusted earnings of $0.18 to $0.20 a share and revenue of $52 million to $54 million, while Street predicts profit of $0.17 a share on revenue of $49.60 million.

The company raised its full year 2011 adjusted earnings guidance to range of $0.98 to $1.00 a share from previous forecast of $0.84 to $0.88 a share. The company also increased its 2011 revenue outlook to range of $208 million to $210 million from previous range of $195 million to $200 million. Street analysts currently predict profit of $0.86 a share on revenue of $198.42 million.

TeleNav reported third quarter earnings of $11.17 million or $0.25 a share, up from $6.76 million or $0.23 a share last year. Adjusted earnings were $12.15 million or $0.27 a share, down from $13.11 million to $0.34 a share last year. Revenue rose to $57.11 million from $45.10 million.

Skyworks Solutions Inc. (SWKS) stock improved 13.67 percent to $31.27 in the after-market trading, as it guided third quarter above Street view. The company expects third quarter adjusted earnings of $0.46 per share and revenue of about $345 million, while Street analysts predict profit of $0.43 per share on revenue of $335.02 million.

Skyworks reported second quarter adjusted earnings of $78.74 million or $0.41 per share, up from $44.16 million or $0.24 per share last year. Revenue grew 37 percent to $325.41 million. Analysts had expected profit of $0.39 per share on revenue of $316.66 million.

Silicon Motion Technology Corp. (SIMO) stock improved 13.35 percent to $12.65 in the after-market trading, as its first quarter earnings and revenue exceeded Street view. Adjusted profit was $5.81 million or $0.18 per American Depository Share (ADS), compared to a loss of $189,000 or $0.01 per ADS last year. Sales grew to $43.4 million from $26 million. Analysts had expected profit of $0.13 per share on revenue of $37.92 million.

Silicon Motion Technology expects second quarter revenue to be flat to up 10 percent sequentially, gross margin excluding stock-based compensation to be in the 46 percent to 48 percent range, and operating expenses excluding stock-based compensation, acquisition-related charges, and other items of about $13 million to $15 million.

For the full year 2011, the company now expects revenue to be up 30 percent to 40 percent from last year, and operating expenses excluding stock-based compensation, acquisition-related charges, and other items of about $55 million to $58 million. Earlier, the company had expected revenue to be up 20 percent to 30 percent from last year, and operating expenses excluding stock-based compensation, acquisition-related charges, and other items of about $53 million to $56 million. Gross margin excluding stock-based compensation is still expected to be in the 46 percent to 48 percent range.

Ancestry.com Inc. (ACOM) stock grew 12.98 percent to $36.22 in the after-market trading, as it guided second quarter revenue above Street view. The company expects second quarter revenue of $98.0 million to $100.0 million, while Street predicts $92.15 million. For the fiscal 2011, the company increased its revenue guidance to range of $395.0 million to $400.0 million from its prior range of $370.0 million to $375.0 million, while Street predicts $374.33 million.

Ancestry.com reported first quarter earnings of $9.0 million or $0.18 per share, up from $4.0 million or $0.08 per share last year. Revenue grew 41.3 percent to $91.03 million, as web sites revenues surged over 42.7 percent. Analysts had expected profit of $0.15 per share on revenue of $86.84 million.

On Assignment Inc. (ASGN) stock grew 12.49 percent to $10.36 in the after-market trading, as it guided second quarter above Street view. The company expects second quarter earnings of $0.13 to $0.14 per share and revenue of $142 million to $145 million, while Street predicts profit of $0.09 per share on revenue of $128.51 million. The estimates assume year-over-year revenue growth of slightly above 60 percent for IT and Engineering, about 50 percent for Life Sciences, high single digit for Healthcare and a low single digit decline in Physician Staffing.

On Assignment reported first quarter earnings of $3.16 million or $0.08 per share, compared to a loss of $302,000 or $0.01 per share last year. Revenue grew to $129.44 million from $96.31 million. Analysts had expected profit of $0.06 per share on revenue of $122.92 million.

True Religion Apparel Inc. (TRLG) stock gained 11.55 percent to $31 in the after-market trading, as its first quarter earnings and revenue exceeded Street view. Profit was $9.0 million or $0.36 per share, up from $8.4 million or $0.34 per share last year. Sales 20.4% to $93.8 million. Analysts had expected profit of $0.26 per share on revenues of $85.35 million. On a same store basis, first quarter sales and e-commerce rose 7.4 percent.