Morning Market Losers

Select Comfort (NASDAQ: SCSS ) dropped 18.30% to $17.44 on weak Q4 guidance. Brightcove (NASDAQ: BCOV) plummeted 18.29% to $11.91 after the company announced its plans to acquire substantially all the assets of Unicorn Media in a cash-stock deal worth around $49 million. BG Medicine (NASDAQ: BGMD )