X0306 4 2015-08-10 0 0001520697 Acadia Healthcare Company, Inc. ACHC 0001040508 BAIN CAPITAL INVESTORS LLC JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group 0001309466 BAIN CAPITAL PARTNERS VIII, L.P. JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group 0001379474 Bain Capital Fund VIII, LLC JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group 0001309468 BAIN CAPITAL FUND VIII, L.P. JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group 0001309467 BAIN CAPITAL VIII COINVESTMENT FUND, L.P. 111 HUNTINGTON AVENUE BOSTON MA 02199 0 0 0 1 Member of 10% Owner Group 0001634734 Bain Capital VIII Coinvestment Fund, LLC JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group 0001634502 Bain Capital (CR), L.P. JOHN HANCOCK TOWER 200 CLARENDON STREET BOSTON MA 02116 0 0 0 1 Member of 10% Owner Group Common Stock, par value $0.01 2015-08-10 4 J 0 42778 0.00 D 5803339 I See Footnotes Bain Capital Investors, LLC ("BCI") is the general partner of Bain Capital Partners VIII, L.P. ("BCP VIII"), which is the general partner of Bain Capital Fund VIII, L.P. ("BCF VIII"), which is the sole member of Bain Capital Fund VIII, LLC ("Fund VIII"). As a result, BCI, BCP VIII and BCF VIII may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by Fund VIII. Each of BCI, BCP VIII and BCF VIII disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is the general partner of BCP VIII, which is the general partner of Bain Capital VIII Coinvestment Fund, L.P. ("BC VIII-CO"), which is the sole member of Bain Capital VIII Coinvestment Fund, LLC ("Fund VIII-CO"). As a result, BCI, BCP VIII and BC VIII-CO may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by Fund VIII-CO. Each of BCI, BCP VIII and BC VIII-CO disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the general partner of Bain Capital (CR), L.P. ("BC CR"). As a result, BCI may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BC CR. BCI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the managing partner of BCIP Associates III ("BCIPA III"), which is the manager of BCIP Associates III, LLC ("BCIP III"). As a result, BCI and BCIPA III may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BCIP III. Each of BCI and BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the managing partner of BCIP Associates III-B ("BCIPA III-B"), which is the manager of BCIP Associates III-B, LLC ("BCIP III-B"). As a result, BCI and BCIPA III-B may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BCIP III-B. Each of BCI and BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the managing partner of BCIP Trust Associates III ("BCIPTA III"), which is the manager of BCIP T Associates III, LLC ("BCIPT III"). As a result, BCI and BCIPTA III may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BCIPT III. Each of BCI and BCIPTA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the managing partner of BCIP Trust Associates III-B ("BCIPTA III-B"), which is the manager of BCIP T Associates III-B, LLC ("BCIPT III-B"). As a result, BCI and BCIPTA III-B may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BCIPT III-B. Each of BCI and BCIPTA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. BCI is also the managing partner of BCIP Associates-G ("BCIP G" and together with Fund VIII, Fund VIII-CO, BC CR, BCIP III, BCIP III-B, BCIPT III and BCIPT III-B, the "Bain Entities"). As a result, BCI may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by BCIP-G. BCI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. On August 10, 2015, the Bain Entities distributed 42,778 shares of Common Stock to one or more members and partners of the Bain Entities in connection with certain charitable gifts made by such members or partners on August 10, 2015. Christopher Gordon 2015-08-12