X0306 4 2018-02-22 1 0001121484 OIL STATES INTERNATIONAL, INC OIS 0001728592 HCperf Holdings B.V. 274 RIVERSIDE AVENUE WESTPORT CT 06880 0 0 1 0 0001468179 LRP V Luxembourg Holdings S.a r.l. 13-15 AVENUE DE LA LIBERTE LUXEMBOURG N4 L-1931 LUXEMBOURG 0 0 1 0 0001728911 LRP IV Luxembourg Holdings S.a.r.l. 13-15 AVENUE DE LA LIBERTE LUXEMBOURG N4 L-1931 LUXEMBOURG 0 0 1 0 0001378669 LIME ROCK PARTNERS IV LP 274 RIVERSIDE AVENUE WESTPORT CT 06680 0 0 1 0 0001433752 LIME ROCK PARTNERS V LP 274 RIVERSIDE AVENUE WESTPORT CT 06680 0 0 1 0 0001206739 REYNOLDS JOHN T 274 RIVERSIDE AVENUE WESTPORT CT 06680 0 0 1 0 0001524918 Farber Jonathan C. 274 RIVERSIDE AVENUE WESTPORT CT 06680 0 0 1 0 Common stock 2018-02-22 4 S 0 5925050 25.785 D 2736033 D HCperf Holdings B.V. (formerly known as GEODynamics B.V.), a Netherlands private limited liability company, directly owns common stock of the Issuer. LRP IV Luxembourg Holdings S.a.r.l. ("LRP IV") and LRP V Luxembourg Holdings S.a.r.l. ("LRP V") collectively own a majority of the outstanding equity interests in GEODynamics B.V. LRP GP IV, Inc. ("GP Inc. IV") is the general partner of Lime Rock Partners GP IV, L.P. ("GP LP IV"), which is the general partner of Lime Rock Partners IV, L.P. ("Lime Rock IV"), which wholly owns LRP IV. LRP GP V, Inc. ("GP Inc. V") is the general partner of Lime Rock Partners GP V, L.P. ("GP LP V"), which is the general partner of Lime Rock Partners V, L.P. ("Lime Rock V"), which wholly owns LRP V. John T. Reynolds ("Reynolds") and Jonathan C. Farber ("Farber") are the sole directors of each of GP Inc. IV and GP Inc. V. (Continued from Footnote 1) Therefore, LRP IV, Lime Rock IV, GP LP IV, GP Inc. IV, LRP V, Lime Rock V, GP LP V, GP Inc. V, Reynolds and Farber may be deemed to beneficially own the reported securities. This report shall not be an admission that LRP IV, Lime Rock IV, GP LP IV, GP Inc. IV, LRP V, Lime Rock V, GP LP V, GP Inc. V, Reynolds and Farber is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934 or for any other purposes. /s/ J. Will Franklin as authorized person for HCperf Holdings B.V. 2018-02-26 /s/ J. Will Franklin, as authorized person for LRP IV Luxembourg Holdings S.a.r.l. 2018-02-26 /s/ J. Will Franklin, as authorized person for Lime Rock Partners IV, L.P. 2018-02-26 /s/ J. Will Franklin, as authorized person for LRP V Luxembourg Holdings S.a.r.l. 2018-02-26 /s/ J. Will Franklin, as authorized person for Lime Rock Partners V, L.P. 2018-02-26 /s/ Kris Agarwal, as Attorney-In-Fact for Jonathan C. Farber 2018-02-26 /s/ Kris Agarwal, as Attorney-In-Fact for John T. Reynolds 2018-02-26