The top after-market Nasdaq gainers Monday were Array BioPharma Inc, Momenta Pharmaceuticals Inc, Aixtron SE, HMS Holdings Corp and Monster Beverage Corporation.

The top after-market Nasdaq losers were Envivio, Groupon Inc, Coinstar Inc, Myrexis Inc and Boingo Wireless.

Gainers

Array BioPharma Inc (ARRY) shares climbed 6.14 percent to $4.84 in after-hours trading Monday. The company reported a lower-than-expected fourth quarter loss of $8 million or $0.09 per share against a loss of $21.8 million or $0.38 per share a year earlier.  Revenues stood at $20.7 million for the fourth quarter.  Analysts expected a loss of 13 cents per share on revenue of $21.4 million.

The shares of Momenta Pharmaceuticals Inc (MNTA) rose 3.32 percent in post-market to close at $14.01.  The company shares have a 52-week low of $10.15, a 52-week high of 19.64 and 682.80 million in market capitalization.

Aixtron SE (AIXG) shares advanced 3.10 percent to $15.30 in post-market trading. The company shares have a 52-week low of $11.18, a 52-week high of 27.05 and 100.82 million in market capitalization.

HMS Holdings Corp (HMSY) shares gained 2.02 percent and reached $36.90 in after-hours trading. The company shares have a 52-week low of $22.41, a 52-week high of 36.97 and 3.12 billion in market capitalization.

Monster Beverage Corporation (MNST) shares surged 1.61 percent to $54.13 in after-hours trading Monday after the company announced that it had doubled the size of its share-repurchase program to $500 million.

Losers

Envivio Inc (ENVI) shares slumped 43.86 percent to $3.20 in the post-market trading Monday. The company gave the earnings expectations for the second quarter of 2013 with a range of $10 million to $11 million, which is below analysts' expectations of 18 million.    

Groupon Inc (SNTS) shares plunged 19.74 percent to $6.06 in the post-market trading. The company reported the second quarter revenue that missed estimates as the economic weakness in Europe negatively impacted its international sales of online coupons. Sales were up 45 percent to $568.3 million but fell short of the analysts' estimate of $575.3 million.

Coinstar (CSTR) shares dropped 9.46 percent to $47.68 in after-hours trading. The company announced that its president and chief operating officer Gregg Kaplan would leave the company to pursue new opportunities.

Myrexis Inc (MYRX) shares dropped 1.59 percent to $2.48 in after-market trading. The company shares have a 52-week low of $2.26, a 52-week high of 3.32 and 67.36 billion in market capitalization.

Boingo Wireless Inc (WIFI) shares lost 1.87 percent in the after-hours trading to reach $6.84.