X0306 4 2018-06-07 0 0001494259 CarGurus, Inc. CARG 0001718998 Argonaut 22 LLC ONE JOY STREET BOSTON MA 02108 0 0 1 0 0001719281 Spinnaker Capital LLC ONE JOY STREET BOSTON MA 02108 0 0 1 0 Class A Common Stock 2018-06-07 4 S 0 900000 33.00 D 10573472 D The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.00 to $33.90 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer. Argonaut 22 LLC is the direct beneficial owner of the shares. Spinnaker Capital LLC is the Managing Member of Argonaut 22 LLC and Anastasios Parafestas, a director of the Issuer, is the Managing Member of Spinnaker Capital LLC. Anastasios Parafestas and Spinnaker Capital LLC are indirect beneficial owners of the reported securities. /s/ Anastasios Parafestas, Manager of Spinnaker Capital LLC, which is the Managing Member of Argonaut 22 LLC 2018-06-08 /s/ Anastasios Parafestas, Manager of Spinnaker Capital LLC 2018-06-08