Meldung vom 28.8 : Xoma Ltd. (XOMA: news, msgs) shares jumped 2 3/16, or 28 percent, to 10, in afternoon trading after U.S. Bancorp Piper Jaffray raised its price target on the stock to $18. The firm cited increased optimism about the company's anti-CD11a treatment for psoriasis, which it's jointly developing with Genentech (DNA: news, msgs).