* Q4 loss 0.58/shr vs est. loss 0.38/shr
* Q4 rev down 41 pct
* Says seeing pricing improvement in 2010
March 9 (Reuters) - Oilfield services company Superior Well Services Inc SWSI.O posted a wider-than-expected fourth-quarter loss, mainly hurt by a fall in its stimulation services unit.
For the fourth quarter ended Dec. 31, net loss was $15.2 million, or 58 cents a share, compared with a profit of $11.9 million, or 48 cents a share, a year earlier.
Revenue fell 40.7 percent to $95.9 million.
Analysts on average were looking for loss of 38 cents, before items, on revenue of $94.0 million, according to Thomson Reuters I/B/E/S.
Revenue from its stimulation services, which accounted for 66 percent of revenue, fell 41.3 percent to $63.6 million.
Chief Executive David Wallace said he expects pricing to continue to improve across operation, depending drilling activity continues at current levels.
"In 2010, we began to see improved pricing in some areas," Wallace said in a statement.
Shares of the company closed at $17.96 Monday on Nasdaq.
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