The top after-market NASDAQ stock market losers are: Dynavox, Clearwire, China Electric Motor, Exide Technologies, ArthroCare, Cray, Harleysville Group, West Coast Bancorp, Kenexa, and Liberty Capital Group.

Dynavox Inc. (DVOX) lost 20.62 percent to $4.62 in the after-market trading. The company's first quater adjusted loss was $1.14 million or 4 cents a share. Sales fell 11 percent to $21.6 million. Analysts had expected profit of 5 cents a share on revenue of $24 million.

Dynavox expects fiscal 2011 adjusted earnings of 21 cents to 27 cents a share and sales to decline 10 percent to 15 percent from last year. Analysts expect profit of 47 cents a share on revenue of $121.16 million.

In early October, DynaVox had withdrawn its earnings guidance for fiscal year 2011, citing more-than-expected weakness in the first quarter. During fourth quarter results, the company had projected adjusted profit of 56 cents to 62 cents a share and sales growth of 14 percent to 17 percent for the full-year 2011.

Clearwire Corp. (CLWR) plunged 9.90 percent to $6.03 in the after-hours session.

China Electric Motor, Inc. (CELM) plummeted 8.39 percent to $5.90 in the after-market session. The company's third quarter profit was $2.7 million or 13 cents a share, down from $3.2 million or 24 cents a share last yar. Adjusted profit was $5.1 million or 25 cents a share. Revenue rose to $32.9 million from $22.1 million.

Exide Technologies (XIDE) fell 3.87 percent to $7.47 in the after-hours trading.

ArthroCare Corp. (ARTC) dropped 2.99 percent to $30.07 in the after-market session.

Cray Inc. (CRAY) tumbled 2.77 percent to $6.25 in the after-hours trading.

Harleysville Group Inc. (HGIC) declined 2.35 percent to $35.15 in the after-market trading.

West Coast Bancorp (WCBO) decreased 2.33 percent to $2.51 in the after-hours session.

Kenexa Corp. (KNXA) fell 2.11 percent to $19.31 in the after-market trading.

Liberty Capital Group (LCAPA) moved down 1.97 percent to $57.87 in the after-hours trading.

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