Morning Market Losers

Select Comfort SCSS dropped 18.30% to $17.44 on weak Q4 guidance. Brightcove 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 BGMD dropped 11.33% to $1.33. BG Medicine shares have dropped 43.40% over the past 52 weeks, while the S&P 500 index has gained 25.27% in the same period. Sarepta Therapeutics SRPT dropped 10.13% to $18.37 after Citigroup downgraded the stock from Neutral to Sell.