X0306 4 2021-01-07 0 0000010254 EARTHSTONE ENERGY INC ESTE 0001774131 Warburg Pincus Private Equity (E&P) XI-A, L.P. C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001774130 Warburg Pincus XI (E&P) Partners - A, L.P. C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001840237 WP IRH Holdings, L.P. C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001840108 Warburg Pincus XI (E&P) Partners-B IRH, LLC C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001676974 WARBURG PINCUS XI (E&P) PARTNERS-B, L.P. C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001678774 WARBURG PINCUS (E&P) XI, L.P. C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001678784 WARBURG PINCUS (E&P) XI LLC C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001678783 WARBURG PINCUS PARTNERS (E&P) XI LLC C/O WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001162870 WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 Class A Common Stock 2021-01-07 4 P 0 638744 3.99 A 13358338 I See footnotes Class A Common Stock 2021-01-07 4 J 0 120228 0.00 D 13238110 I See footnotes Following the transactions reported herein, includes: 2,123,393 shares held of record by Warburg Pincus Private Equity (E&P) XI - A, L.P. ("WP E&P XI A"), 163,270 shares held of record by Warburg Pincus XI (E&P) Partners - A, L.P. ("WP XI E&P Partners A"), 2,068,675 shares held of record by WP IRH Holdings, L.P. ("WP IRH Holdings"), 57,365 shares held of record by Warburg Pincus XI (E&P) Partners-B IRH, LLC ("WP XI E&P Partners B IRH"), 3,179,794 shares held of record by WP Energy IRH Holdings, L.P. ("WPE IRH Holdings"), 260,350 shares held of record by WP Energy Partners IRH Holdings, L.P. ("WPE Partners IRH Holdings"), 101,492 shares held of record by Warburg Pincus Energy (E&P) Partners-B IRH, LLC ("WPE E&P Partners B IRH"), 300,946 shares held of record by Warburg Pincus Energy (E&P) Partners-A, L.P. ("WPE E&P Partners A") and 4,982,825 shares held of record by Warburg Pincus Energy (E&P)-A, L.P. ("WPE E&P A"). Warburg Pincus XI (E&P) Partners - B, L.P. ("WP XI E&P Partners B") is the general partner of WP XI E&P Partners B IRH. Warburg Pincus (E&P) XI, L.P. ("WP XI E&P GP") is the general partner of WP E&P XI A, WP XI E&P Partners A, WP IRH Holdings, and WP XI E&P Partners B. Warburg Pincus (E&P) XI LLC ("WP XI E&P GP LLC") is the general partner of WP XI E&P GP. Warburg Pincus Partners (E&P) XI LLC ("WPP E&P XI") is the managing member of WP XI E&P GP LLC. Warburg Pincus Energy (E&P) Partners-B, L.P. ("WPE E&P Partners B") is the general partner of WPE E&P Partners B IRH. Warburg Pincus (E&P) Energy GP, L.P. ("WPE E&P GP") is the general partner of WPE IRH Holdings, WPE Partners IRH Holdings, WPE E&P Partners B, WPE E&P Partners A, and WPE E&P A. Warburg Pincus (E&P) Energy LLC ("WPE E&P GP LLC") is the general partner of WPE E&P GP. Warburg Pincus Partners II (US), L.P. ("WPP II US") is the managing member of WPP E&P XI and WPE E&P GP LLC. Warburg Pincus & Company US, LLC ("WP & Co. US LLC") is the general partner of WPP II US. Warburg Pincus LLC ("WP LLC") is a registered investment adviser, and the manager of WP E&P XI A, WP XI E&P Partners A, WPE E&P Partners A, and WPE E&P A. Immediately following the acquisition of shares of Class A Common Stock reported herein, Independence Resources Holdings, LLC disposed of all of its shares of Class A Common Stock in a pro-rata distribution in-kind to its members for no consideration. Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4. Warburg Pincus Private Equity (E&P) XI - A, L.P. By: Warburg Pincus & Company US, LLC By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus XI (E&P) Partners - A, L.P. By: Warburg Pincus & Company US, LLC By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 WP IRH Holdings, L.P. By: Warburg Pincus & Company US, LLC, By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus XI (E&P) Partners-B IRH, LLC By: Warburg Pincus & Company US, LLC By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus XI (E&P) Partners - B, L.P., By: Warburg Pincus & Company US, LLC, By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus (E&P) XI, L.P. By: Warburg Pincus & Company US, LLC, By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus (E&P) XI LLC By: Warburg Pincus & Company US, LLC, By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus Partners (E&P) XI LLC By: Warburg Pincus & Company US, LLC, By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11 Warburg Pincus LLC By: /s/ Robert B. Knauss, Authorized Signatory 2021-01-11