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Updated from 1:50 p.m. EDT with new stock prices

Small-cap followed as the major indices slumped into negative territory. The Russell 2000 was still down 1.15% at 727.19, and the S&P SmallCap 600 was likewise down 1.15% at 384.66.

Shares of

U.S. Geothermal


, a Boise, Idaho, company that develops geothermal properties, soared 8.8% to $2.59. RBC Capital Markets initiated coverage of the stock with an outperform rating. U.S. Geothermal also announced a joint venture with Gerlach Green Energy to explore the Gerlach geothermal system located in northwestern Nevada.

Oil and gas company



jumped 8.2% to $1.72. The Houston-based company announced a natural gas discovery in the Norwegian North Sea. It said it will participate in the drilling of eight wells overall in 2008.

Willow Financial Bancorp

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added 20.5% to $9.33. The Wayne, Pa., provider of commercial banking services announced

Harleysville National

( HNBC) would buy it in an all-stock deal. Each share of Willow Financial stock will be exchanged for 0.73 shares of Harleysville stock. Harleysville National shares shed 4% to $13.54 on the news.

Also on the losing side, Westborough, Mass., information technology services company


(VRTU) - Get Virtusa Corporation Report

stumbled 12.8% to $10.45 after offering weak guidance. The firm predicted earnings between 70 cents and 79 cents a share for the fiscal year ending in March 2009. Analysts polled by Thomson Reuters are expecting EPS of 90 cents.


Guaranty Financial

( GFG), an Austin, Texas commercial and retail banking services provider, slipped 12.4% to $5.23. The company announced a stock offering of up to $350 million.