X0306 4 2018-01-22 0 0001367920 CONCERT PHARMACEUTICALS, INC. CNCE 0001185039 ALDRICH RICHARD C/O CONCERT PHARMACEUTICALS, INC. 99 HAYDEN AVENUE, SUITE 500 LEXINGTON MA 02421 1 0 0 0 Common Stock 2018-01-22 4 S 0 5000 19.55 D 36946 I See Footnote Common Stock 2018-01-22 4 S 0 5000 19.54 D 57405 I See Footnote Common Stock 2018-01-23 4 S 0 5000 19.67 D 31946 I See Footnote Common Stock 2018-01-23 4 S 0 5000 19.68 D 52405 I See Footnote Common Stock 2018-01-24 4 S 0 5000 19.83 D 26946 I See Footnote Common Stock 2018-01-24 4 S 0 5000 19.83 D 47405 I See Footnote Common Stock 286975 D This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the holder on December 13, 2017. The range of prices for the transaction reported on this line was $19.41 to $19.82. The average weighted price was $19.55. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Shares held by Little Bear Associates, Inc., formerly known as RA Capital Associates, Inc. Mr. Aldrich is the sole stockholder of Little Bear Associates, Inc. The range of prices for the transaction reported on this line was $19.37 to $19.84. The average weighted price was $19.54. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Shares held by Little Eagles, LLC. The owners of Little Eagles, LLC are Richard H. Aldrich Irrevocable Trust of 2011 and trusts established for the benefit of Mr. Aldrich's minor children. The trustees of Richard H. Aldrich Irrevocable Trust of 2011 are Mr. Aldrich's spouse, Nichole A. Aldrich, and Mr. Aldrich's brother, Caleb F. Aldrich. The beneficiaries of Richard H. Aldrich Irrevocable Trust of 2011 are Mr. Aldrich's minor children. Mr. Aldrich disclaims beneficial ownership of such shares except to the extent of any pecuniary interest therein. The range of prices for the transaction reported on this line was $19.47 to $19.85. The average weighted price was $19.67. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The range of prices for the transaction reported on this line was $19.47 to $19.85. The average weighted price was $19.68. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. The range of prices for the transaction reported on this line was $19.61 to $20.00. The average weighted price was $19.83. The reporting person will provide, upon request by the SEC, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. /s/Nancy Stuart as attorney-in-fact for Richard Aldrich 2018-01-24