X0206 3 2021-06-10 0 0001845257 LifeStance Health Group, Inc. LFST 0001866164 Silversmith Partners I GP, LLC 116 HUNTINGTON AVENUE, 15TH FLOOR BOSTON MA 02116 0 0 1 0 0001866163 Silversmith Partners I GP, L.P. 116 HUNTINGTON AVENUE, 15TH FLOOR BOSTON MA 02116 0 0 1 0 0001649052 Silversmith Capital Partners I-A, L.P. 116 HUNTINGTON AVENUE, 15TH FLOOR BOSTON MA 02116 0 0 1 0 0001649051 Silversmith Capital Partners I-B, L.P. 116 HUNTINGTON AVENUE, 15TH FLOOR BOSTON MA 02116 0 0 1 0 0001649053 Silversmith Capital Partners I-C, L.P. 116 HUNTINGTON AVENUE, 15TH FLOOR BOSTON MA 02116 0 0 1 0 Common Stock 20613453 I See Explanation of Responses Silversmith Partners I GP, LLC is the general partner of Silversmith Partners I GP, L.P., which is the general partner of Silversmith Capital Partners I-A, L.P., Silversmith Capital Partners I-B, L.P. and Silversmith Capital Partners I-C, L.P. (collectively, the "Silversmith Entities"). Silversmith Capital Partners I-A, L.P. holds 14,183,201 shares of common stock of the Issuer, Silversmith Capital Partners I-B, L.P. holds 5,130,460 shares of common stock of the Issuer and Silversmith Capital Partners I-C, L.P. holds 1,299,792 shares of common stock of the Issuer. Each Reporting Person disclaims beneficial ownership of all of the securities that are or may be beneficially owned by the Silversmith Entities or any of their affiliates, except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the Shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Silversmith Capital Partners I-A, L.P., Silversmith Capital Partners I-B, L.P. and Silversmith Capital Partners I-C, L.P. have entered into a Stockholders Agreement with certain persons who are owners of more than 10% of the Issuer's outstanding common stock and, as a result, the Silversmith Entities may be deemed a member of a "group" (as such term is used under Section 13(d) of the Securities Exchange Act of 1934, as amended) with such persons. By: /s/ Jeffrey R. Crisan, Manager of Silversmith Partners I GP, LLC 2021-06-10 By: /s/ Jeffrey R. Crisan, Manager of Silversmith Partners I GP, LLC, the General Partner of Silversmith Partners I GP, L.P. 2021-06-10 By: /s/ Jeffrey R. Crisan, Manager of Silversmith Partners I GP, LLC, the General Partner of Silversmith Partners I GP, L.P., the General Partner of Silversmith Capital Partners I-A, L.P. 2021-06-10 By: /s/ Jeffrey R. Crisan, Manager of Silversmith Partners I GP, LLC, the General Partner of Silversmith Partners I GP, L.P., the General Partner of Silversmith Capital Partners I-B, L.P. 2021-06-10 By: /s/ Jeffrey R. Crisan, Manager of Silversmith Partners I GP, LLC, the General Partner of Silversmith Partners I GP, L.P., the General Partner of Silversmith Capital Partners I-C, L.P. 2021-06-10