Shares of Williams-Sonoma Inc. (NYSE: WSM) are down 11.5% as of 11:00 a.m. EST after the home-furnishings retailer announced in-line quarterly results, but offered underwhelming earnings guidance for the holiday quarter. The company also announced an acquisition.Williams-Sonoma's third-quarter revenue climbed 4.3% year over year to $1.299 billion, including 3.3% comparable-brand growth.