The top after-market NASDAQ gainers Monday were: PAREXEL International Corp, Hologic, Rudolph Technologies, ImmunoGen, School Specialty and Mindspeed Technologies. The top after-market NASDAQ losers were: Align Technology, Rent-A-Center Inc, Rex Energy Corp, magicJack VocalTec, ICU Medical and Cognex Corp.

Gainers:

PAREXEL International Corp. (NASDAQ:PRXL) shares climbed 10.46 percent to $22.60 in post market trading session. The company reported second quarter adjusted net income of $13.9 million or $0.23 per share compared to $17.2illion or $0.29 per share I the same period last year and against analysts estimation of $0.23 per share.

For the third quarter, the company expects adjusted earnings to be in a range of $0.30 to $0.32 per share on revenue of $350 to $358 million, while analysts’ expect the company to report quarterly net profit of $0.30 per share on revenues of $347.05 million.

Hologic, Inc. (NASDAQ:HOLX) shares surged 7.08 percent to $20.56 in post market trading session. The company reported first quarter adjusted net income of $0.34 per share compared to $0.30 per share in the same period last year and against analysts’ estimation of $0.32 per share.

Rudolph Technologies, Inc. (NASDAQ:RTEC) shares gained 6.77 percent to $10.73 in post market trading session. The company reported fourth quarter net profit of $6.2 million or $0.19 per share compared to $9.6 million or $0.30 per share in the same period last year and against analysts’ estimation of $0.09 per share.

ImmunoGen, Inc. (NASDAQ:IMGN) shares gained 6.49 percent to $14.77 in post market trading session. Analysts at Canaccord Genuity reiterated “buy” rating on shares of IMGN.

School Specialty, Inc. (NASDAQ:SCHS) shares rose 5.74 percent to $3.50 in post market trading session.

Mindspeed Technologies, Inc. (NASDAQ:MSPD) shares declined 5.14 percent to $5.93 in aftermarket trading session. The company swung to first quarter net loss of $5.6 million or $0.17 per share compared to net profit of $1.7 million or $0.05 per share in the same period last year.

For the second quarter, the company expects revenues to be in a range of $33.5 to $35.5 million, while analysts expect the company to report quarterly revenue of $33.43 million for the second quarter.

Losers:

Align Technology, Inc. (NASDAQ:ALGN) shares plunged 6.62 percent to $23.70 in post market trading session as its first quarter earnings guidance fell short of expectations. The company expects first quarter adjusted earnings to be in a range of $0.19 to $0.21 per share on revenue of $125.4 to $127.9 million, while analysts’ expect net profit of $0.22 per share on revenue of $129.1 million for the first quarter.

Align Technology’s fourth quarter net profit more than double to $20.4 million or $0.25 per share from $9.9 million or $0.13 per share in the same period last year.

Rent-A-Center Inc. (NASDAQ:RCII) shares plunged 5.83 percent to $35.02 in post market trading session as its fourth quarter revenue and fiscal 2012 earnings guidance fell short of expectations. Its fourth quarter net profit rose 9 percent to $738 million from $677 million in the same period last year, but fell short of analysts’ expectation of $742.16 million.

For the fiscal 2012, the company expects earnings to be in a range of $3.00 to $3.20 per share, while analysts’ expect the company to report net profit of $3.22 per share on revenue of $3.13 billion.

Rex Energy Corp. (NASDAQ:REXX) shares declined 5.75 percent to $10.00 in post market trading session. The company announced Monday that it is commencing an underwritten public offering of 7.0 million shares of its common stock.

magicJack VocalTec Ltd. (NASDAQ:CALL) shares declined 4.13 percent to $ 16.50 in aftermarket trading session.

ICU Medical, Inc. (NASDAQ:ICUI) shares declined 3.99 percent to $44.00 in post market trading session as its fiscal 2012 earnings fell short of expectations.

For the fiscal 2012, the company expects net income to be in a range of $2.45 to $2.70 per share on revenue of $318 million to $330 million, while analysts’ expect the company to report net income of $2.67 per share and revenues of $325.69 million.

Cognex Corp. (NASDAQ:CGNX) shares declined 3.61 percent to $40.00 in post market trading session. The stock has a 52-week low of $24.61, a 52-week high of $41.87 and $1.75 billion in market capitalization.