The top after-market NASDAQ gainers Monday were: PLX Technology, Kona Grill, Veeco Instruments, Central European Media Enterprises, Shutterfly and ShoreTel, Inc. The top after-market NASDAQ losers were: QuinStreet, PAREXEL International Corp, Integrated Device Technology, ImmunoGen and American Superconductor Corp.

Gainers

PLX Technology, Inc. (PLXT) stock climbed 65.58 percent to $6.59 in post market session. Analog chipmaker Integrated Device Technology Inc (IDT) announced that it has agreed to acquire PLX Technology for about $330 million in cash and stock. Under the terms of deal, PLX stockholders will receive $3.50 in cash and 0.525 shares of IDT common stock for each PLX common share outstanding.

Kona Grill, Inc. (KONA) stock climbed 13.67 percent to $7.65 in post market session. The company swung to first quarter net income of $0.13 per share compared to net loss of $0.01 per share in the same period last year. Revenue was $24.2 million, up from $22.2 million in the same quarter last year and above analysts' estimation of $23.11 million.

Veeco Instruments Inc. (VECO) stock climbed 13.95 percent to $34.40 in aftermarket session after reporting first quarter earnings above analysts' estimates. The company reported first quarter net income of $16.4 million or $0.42 per share, down from $52.6 million or $1.24 per share in the same period a year-earlier. Revenue was $139.9 million, down from $254.7 million in the same quarter last year. Analysts' expected net profit of $0.19 per share on revenues of $126.03 million.

Central European Media Enterprises Ltd. (CETV) stock climbed 13.78 percent to $9.00 in post market trading. The company announced that it has commenced a tender offer for $129,700,000 of its outstanding 3.50 percent Senior Convertible Notes due 2013.

Shutterfly, Inc. (SFLY) stock surged 11.01 percent to $34.59 in post market trading. Its first quarter net loss widened to 10.0 million or $0.29 per share from $7.8 million or $0.27 per share in the same period a year-ago. Revenue surged 60 percent to $91.29 million, while analysts' expected net loss of $0.32 per share on revenue of $84.59 million.

ShoreTel, Inc. (SHOR) stock climbed 11.06 percent to $5.32 in post market session. The company swung to third quarter net loss of $0.03 per share compared to net profit of $0.01 per share in the same period last year.

Losers

QuinStreet, Inc. (QNST) stock slumped 14.37 percent to $9.00 in post market session. Its third quarter net profit declined to $2.87 million or $0.06 per share from $6.34 million or $0.13 per share in the same period a year-ago. Adjusted net income was $0.23 per share compared to $0.25 per share in the same quarter last year and also fell short of analysts' estimation of $0.24 per share.

PAREXEL International Corp. (PRXL) stock slumped 7.2 percent to $25.00 in aftermarket session after lowering its fiscal 2012 earnings guidance. The company currently expects fiscal 2012 earnings to be in a range of $1.03 to $1.05 per share compared to prior estimation of $1.01 to $1.09 per share and against analysts' estimation of $1.12 per share.

Integrated Device Technology, Inc. (IDTI) stock plunged 6.86 percent to $6.31 in post market session. The company announced that it has agreed to acquire PLX Technology for about $330 million in cash and stock.

ImmunoGen, Inc. (IMGN) stock plunged 4.39 percent to $12.19 in aftermarket trading session.

American Superconductor Corp. (AMSC) stock declined 4.36 percent to $3.95 in aftermarket session. The stock has a 52-week low of $3.21, a 52-week high of $12.75 and $212.55 million in market capitalization.