Clean Harbors ( CLHB) rose as the environmental and hazardous waste management services company reported higher second-quarter earnings. The company earned $11.3 million, or 55 cents a share, compared with $7.4 million, or 43 cents a share, a year ago. Revenue increased 15% to $199.6 million. Analysts were looking for Clean Harbors to earn 54 cents a share on $186.9 million in revenue.

Looking ahead, the company said it expects third-quarter revenue in the range of $190 million to $195 million. Wall Street is forecasting revenue of $191.1 million. Shares gained $3.81, or 10.7%, to $39.38.

Tekelec ( TKLC) climbed after the networking company reported a surge in second-quarter earnings. The company earned $14.6 million, or 20 cents a share, compared with $785,000, or 1 cent a share, a year ago. Sales climbed 34% to $149.9 million. Analysts forecast a loss of 4 cents a share on sales of $124 million.

Tekelec said it recently met informally with the staff of the Atlanta office of the Securities and Exchange Commission to discuss the company's restatement. Tekelec said it intends to continue to fully cooperate with the staff and to furnish additional information if requested to do so. Shares gained $1.51, or 14.6%, to $11.83.

Asset Acceptance Capital ( AACC) slipped after the purchaser of charged-off consumer debt posted a drop in second-quarter income. The company earned $12.4 million, or 33 cents a share, compared with $16.3 million, or 44 cents a share, a year ago. Revenue declined 2.9% to $66.8 million.

Analysts expected 38 cents a share of earnings on sales of $70.5 million. Shares fell $2.66, or 14.2%, to $16.08.

Wabash National ( WNC) stumbled after the maker of truck trailers and transportation equipment postponed its second-quarter earnings release and warned that its sales and profits would be below expectations. Consolidated net sales are estimated to be around $333 million. Shares slipped $1.28, or 9.3%, to $12.42.

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