X0306 4 2013-05-01 0001062449 BUFFALO WILD WINGS INC BWLD 0001268906 MACK WARREN E 5500 WAYZATA BLVD. SUITE 1600 MINNEAPOLIS MN 55416 1 Common Stock 2013-05-01 4 S 0 1000 87.4537 D 26944 D Reflects the weighted average price of 1,000 shares of common stock of Buffalo Wild Wings, Inc. sold by the reporting person in multiple transactions on May 1, 2013 with sale prices ranging from $87.45 to $87.455 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price. /s/ Julie M. Regnier, Attorney-in-Fact for Warren E. Mack 2013-05-03