For the first time in a long time, this week was a very good one to own stock in Valeant Pharmaceuticals International Inc. Since Monday's close, Valeant shares have gained 36 percent, the best three-day run for the shares since 1996, a period that includes the company's predecessor Biovail Corp. Valeant gained 3.9 percent on Thursday to close at $35.51 in New York trading. "It seems like it has found a bottom," said Annabel Samimy, an analyst at Stifel Nicolaus & Co.