The top after-market NASDAQ stock market losers are: Alterra Capital Holdings, Celera, Infinera, Aruba Networks, Alnylam Pharmaceuticals, Alphatec Holdings, optionsXpress Holdings, A123 Systems, Informatica, and Applied Micro Circuits.

Alterra Capital Holdings Ltd. (ALTE) lost 5.67 percent to $19.97 in the after-hours trading.

Celera Corp. (CRA) plunged 3.72 percent to $6.22 in the after-market session.

Infinera Corp. (INFN) plummeted 2.48 percent to $10.24 in the after-hours trading.

Aruba Networks, Inc. (ARUN) fell 2.47 percent to $21.15 in the after-market session.

Alnylam Pharmaceuticals, Inc. (ALNY) dropped 2.24 percent to $9.84 in the after-hours trading.

Alphatec Holdings, Inc. (ATEC) tumbled 1.95 percent to $2.48 in the after-market session.

optionsXpress Holdings, Inc. (OXPS) slid 1.08 percent to $20.19 in the after-hours trading.

A123 Systems, Inc. (AONE) declined 0.90 percent to $9.62 in the after-market session.

Informatica Corp. (INFA) decreased 0.82 percent to $45.06 in the after-hours trading.

Applied Micro Circuits Corp. (AMCC) moved down 0.81 percent to $10.53 in the after-market session.

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