What you need to know on Wall Street today

Welcome to Finance Insider, Business Insider's summary of the top stories of the past 24 hours. Sign up here to get the best of Business Insider delivered direct to your inbox. Roark Capital is buying Buffalo Wild Wings for $2.9 billion — a 34% premium over the company's valuation before Roark began bidding for it in mid-November. The private-equity firm, which also owns Cinnabon and engineered a breathtaking comeback for Arby's, is betting it can do the same for the struggling...