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Shares of

Napster Inc.

rose as much as 13 percent after the company increased its sales estimate due to rising demand for its monthly subscription service. The L.A.-based digital music provider, which is spending $30 million to spur sales of its “Napster to Go” service to compete with Apple’s iTunes, said it expects revenues of $15 million in the quarter ending this month, up from a previously expected $14 million, according to a company release.

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DaVita Inc.

, .operator of the nation’s second-largest chain of dialysis centers, said Thursday it intends to offer $500 million of senior notes due in 2013 and $850 million senior subordinated notes due in 2015. The El Segundo-based company said it plans to use proceeds from the sale, along with available cash, to repay outstanding debt.

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Tekelec

said Thursday that it is being sued by French telephone network operator Bouygues Telecom in the U.S. District Court for the Central District of California for compensatory damages of $81 million, plus punitive damages associated with a service interruption Bouygues Telecom experienced in its network in November of last year. Bouygues Telecom alleges the service interruption was caused by malfunctioning servers provided by Tekelec. Tekelec denies the equipment was faulty and said Bouygues’ claims could not support the damage figures in the complaint.