X0306 4 2018-10-15 0001494259 CarGurus, Inc. CARG 0001719281 Spinnaker Capital LLC ONE JOY STREET BOSTON MA 02108 1 Class A Common Stock 2018-10-15 4 S 0 50000 41.72 D 8541646 I See footnote Class A Common Stock 2018-10-16 4 S 0 50000 42.50 D 8491646 I See footnote This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.12 to $42.26 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. The shares are owned directly by Argonaut 22 LLC. The Reporting Person is the Managing Member of Argonaut 22 LLC and Anastasios Parafestas, a director of the Issuer, is the Managing Member of the Reporting Person. The Reporting Person and Anastasios Parafestas are indirect beneficial owners of the reported securities. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.39 to $43.11 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. /s/ Anastasios Parafestas, Manager of Spinnaker Capital LLC 2018-10-17