The top after-market NASDAQ stock market gainers are: JDS Uniphase, Opnext, Aviat Networks, Silicon Image and China MediaExpress Holdings. The top after-market NASDAQ stock market losers are: Power-One, Biodel, Coinstar, pSivida and MedQuist.

Gainers

JDS Uniphase Corp. (NASDAQ:JDSU) shares surged 18.13 percent to $21.18 in aftermarket trading session as the company swung to second-quarter net income of $23.6 million or $0.10 per share, compared with a loss of $19.5 million or $0.09 per share in the same quarter a year-ago. Revenue rose to $473.5 million from $342.9 million last year.

Opnext, Inc. (NASDAQ:OPXT) shares climbed 17.09 percent to $2.33 in post market trading session as its third quarter loss narrowed due to double digit revenue growth from last year. The company reported third quarter net loss of $0.06 per share on $90.23 million revenue, while analysts’ expected a net loss of $0.11 per share and revenue of $97.1 million revenue.

Aviat Networks, Inc. (NASDAQ:AVNW) shares jumped 15.33 percent to $6.02 in aftermarket trading session as the company reported second quarter earnings and third quarter guidance above analysts’ estimates. Its second quarter revenue came in at $124.2 million against analysts’ estimation of $112.71 million. It also expects third quarter revenue in the range of $115-$125 million against expectations of $112.34 million.

Silicon Image, Inc. (NASDAQ:SIMG) shares gained 11.27 percent to $8.59 in post market trading session, following better-than-expected fourth quarter earnings.

China MediaExpress Holdings, Inc. (NASDAQ:CCME) shares advanced 10.37 percent to $12.24 in aftermarket trading session. Its shares plunged 33 percent in regular trading session Hong Kong-based Muddy Waters Research alleged that the advertising firm's actual revenue fell far short of what it had reported in 2009.

Losers

Power-One, Inc. (NASDAQ:PWER) shares plunged 21.62 percent to $9.21 in aftermarket trading session as its first quarter and full year revenue forecast for fiscal 2011 fell short of analysts’ estimation. The company expects first quarter revenue in the range of $260-$290 million and full year revenue in the range of $1.1-$1.3 billion, while analysts’ expects first quarter revenue of $313 million and full year revenue of $1.31 billion.

Biodel Inc. (NASDAQ:BIOD) shares declined 11.45 percent to $2.01 in post market trading session. The company reported first quarter net loss of $0.20 per share compared to a net loss of $0.47per share in the same quarter a year-ago.

Coinstar, Inc. (NASDAQ:CSTR) shares declined 10.26 percent to $39.70 in aftermarket trading session as the company forecasts first-quarter earnings from continuing operations of no more than $0.25 per share against analysts’ estimation of $0.57 per share.

pSivida Corp. (NASDAQ:PSDV) shares declined 8.49 in post market trading session. The stock has a 52 week low of $3.08 and 52 week high of $7.22 and has $89.51 million market capitalization.

MedQuist, Inc. (NASDAQ:MEDQ) shares declined 6 percent to $9.40 in aftermarket trading session. The stock has a 52 week low of $6.86 and 52 week high of $12.39 and has $375.56 million market capitalization.