X0306 4 2018-08-17 0001031203 GROUP 1 AUTOMOTIVE INC GPI 0001528370 Grese Frank 800 GESSNER SUITE 500 HOUSTON TX 77024 1 Senior Vice President, HR Common Stock 2018-08-17 4 S 0 5000 76.9846 D 34051.1146 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.90 to $77.12, inclusive. The reporting person undertakes to provide to Group 1 Automotive, Inc., any security holder of Group 1 Automotive, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote 1 to this Form 4. Includes shares purchased in the Group 1 Automotive, Inc. Employee Stock Purchase Plan. The plan provides for a stock purchase discount of 15%, and is calculated using the stock closing price of the first or last day of the quarter, whichever is lower. /s/ Beth Sibley, attorney-in-fact for Frank Grese 2018-08-20