The top after-market NASDAQ losers Tuesday were: EMCORE Corp, Rex Energy Corp, Pacific Biosciences of California, CoBiz Financial, West Marine, Bank Mutual Corp, Silicon Motion Technology, United Community Banks, Cumulus Media and Builders FirstSource.

EMCORE Corp. (EMKR) stock slumped 10.82 percent to $4.37 in aftermarket trading session. The company stock climbed nearly 8 percent in regular trading session.

Rex Energy Corp. (REXX) stock slumped 9.73 percent to $10.86 in aftermarket trading session. The stock has a 52-week low of $9.29, a 52-week high of $18.00 and $539.66 million in market capitalization.

Pacific Biosciences of California Inc. (PACB) stock slumped 9.37 percent to $3.48 in aftermarket trading session.

CoBiz Financial Inc. (COBZ) stock slumped 7.78 percent to $6.40 in aftermarket trading session. The company announced that it has priced an underwritten offering of 2,100,000 shares of its Common Stock at a price to the public of $6.00 per share, Reuters reported.

West Marine Inc. (WMAR) stock plunged 7.53 percent to $10.81 in aftermarket trading session. The stock has a 52-week low of $6.97, a 52-week high of $13.49 and $268.77 million in market capitalization.

Bank Mutual Corp. (BKMU) stock plunged 6.74 percent to $4.01 in aftermarket trading.

Silicon Motion Technology Corp. (SIMO) stock fell 6.62 percent to $19.73 in post market session. The company stock climbed more than 6 percent in regular trading.

United Community Banks Inc. (UCBI) stock declined 6.52 percent to $9.17 in post market trading session. The stock has a 52-week low of $6.22, a 52-week high of $14.65 and $564.68 million in market capitalization.

Cumulus Media Inc. (CMLS) stock fell 6.34 percent to $3.40 in post market trading session.

Builders FirstSource Inc. (BLDR) stock declined 6.10 percent to $4.00 in aftermarket trading session. The stock has a 52-week low of $1.01, a 52-week high of $4.29 and $411.57 million in market capitalization.

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