The top after-market NASDAQ gainers Monday were Urban Outfitters Inc, Merrimack Pharmaceuticals Inc, InterMune Inc, Ariad Pharmaceuticals Inc and Albany Molecular Research Inc.

The top after-market NASDAQ losers Monday were Alnylam Pharmaceuticals Inc, JA Solar Holdings Company, MAKO Surgical and Mobile Mini Inc.

Gainers

Urban Outfitters Inc (URBN) shares climbed 6.51 percent to $39.41 in post-market trading. The stock has a 52-week low of $23.42, a 52-week high of $40.65 and $5.40 billion in market capitalization.

Merrimack Pharmaceuticals Inc (MACK) shares gained 6.08 percent to $6.46 in post-market trading. The company announced the Phase I clinical trial results for MM-302, the company's novel agent for the treatment of advanced HER2 positive (HER2+ or ErbB2+) breast cancer. The findings demonstrated preliminary safety and tolerability.

InterMune Inc (ITMN) shares rose 3.52 percent to $9.40 in post-market trading. The company shares have a 52-week trading range of $7.21 - $19.33 and 599.42 million in market capitalization.

Ariad Pharmaceuticals Inc (ARIA) shares advanced 2.39 percent to $23.58 in post-market trading. The company announced the updated molecular response data from its Phase 1 and pivotal Phase 2 trials of Ponatinib, its investigational BCR-ABL inhibitor, in heavily pretreated patients with resistant or intolerant chronic myeloid leukemia.

Albany Molecular Research Inc (AMRI) shares went up by 2.17 percent to $5.18 in post-market trading. The stock has a 52-week low of $2.25, a 52-week high of $5.39 and $154.18 million in market capitalization.

Losers

Alnylam Pharmaceuticals Inc (ALNY) shares declined 3.75 percent to $16.94 in post-market trading. The shares have a 52-week trading range of $7.03-$21.38 and 922.44 million in market capitalization.

JA Solar Holdings Company (JASO) shares slumped 3.59 percent to $ 3.22 in post-market trading. The shares have a 52-week trading range of $2.91 - $11.70 and 135.10 million in market capitalization.

MAKO Surgical Corporation (MAKO) shares dropped 2.21 percent to $12.40 in post-market trading. The stock has a 52-week trading range of $11.99 -$45.15 and $538.41 million in market capitalization.

Mobile Mini Inc (MINI) shares fell 2.15 percent to $21.04 in post-market trading. The stock surged over 4 percent in regular trading following the analysts’ upgrade of the stocks to a "Buy" rating from a "Hold" rating.

Merck & Co.