Warburg Pincus Private Equity SC 13D/A EARTHSTONE ENERGY / Warburg Pincus Private Equity ownership change

Exhibit 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13D. Each of them is responsible for the timely filing of such statement and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 23^rd day of February, 2022.

Warburg Pincus Private Equity (E&P) XI – A, L.P.
By:	Warburg Pincus (E&P) XI, L.P., its general partner
By:	Warburg Pincus (E&P) XI LLC, its general partner
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
Warburg Pincus XI (E&P) Partners – A, L.P.
By:	Warburg Pincus (E&P) XI, L.P., its general partner
By:	Warburg Pincus (E&P) XI LLC, its general partner
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

WP IRH Holdings, L.P.
By:	Warburg Pincus (E&P) XI, L.P., its general partner
By:	Warburg Pincus (E&P) XI LLC, its general partner
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
Warburg Pincus XI (E&P) Partners-B IRH, LLC
By:	Warburg Pincus XI (E&P) Partners – B, L.P., its managing member
By:	Warburg Pincus (E&P) XI, L.P., its general partner
By:	Warburg Pincus (E&P) XI LLC, its general partner
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
Warburg Pincus XI (E&P) Partners – B, L.P.
By:	Warburg Pincus (E&P) XI, L.P., its general partner
By:	Warburg Pincus (E&P) XI LLC, its general partner
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

2

Warburg Pincus (E&P) XI LLC
By:	Warburg Pincus Partners (E&P) XI LLC, its sole member
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
Warburg Pincus Partners (E&P) XI LLC
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WP Energy IRH Holdings, L.P.
By:	Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:	Warburg Pincus (E&P) Energy LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

3

WP Energy Partners IRH Holdings, L.P.
By:		Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:		Warburg Pincus (E&P) Energy LLC, its general partner
By:		Warburg Pincus Partners II (US), L.P., its managing member
By:		Warburg Pincus & Company US, LLC, its general partner
By:		/s/ Harsha Marti
Name:		Harsha Marti
Title:		Authorized Signatory
Warburg Pincus Energy (E&P) Partners-B IRH, LLC
By:		Warburg Pincus Energy (E&P) Partners-B, L.P., its managing member
By:		Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:		Warburg Pincus (E&P) Energy LLC, its general partner
By:		Warburg Pincus Partners II (US), L.P., its managing member
By:		Warburg Pincus & Company US, LLC, its general partner
By:		/s/ Harsha Marti
Name:		Harsha Marti
Title:		Authorized Signatory
Warburg Pincus Energy (E&P) Partners-B, L.P.
By:		Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:		Warburg Pincus (E&P) Energy LLC, its general partner
By:	��	Warburg Pincus Partners II (US), L.P., its managing
		member
By:		Warburg Pincus & Company US, LLC, its general partner
By:		/s/ Harsha Marti
Name:		Harsha Marti
Title:		Authorized Signatory

4

Warburg Pincus Energy (E&P) Partners-A, L.P.
By:	Pincus (E&P) Energy GP, L.P., its general partner
By:	Warburg Pincus (E&P) Energy LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
Warburg Pincus Energy (E&P)-A, L.P.
By:	Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:	Warburg Pincus (E&P) Energy LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS (E&P) XII, L.P.
By:	Warburg Pincus (E&P) XII LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory

5

WARBURG PINCUS (E&P) XII LLC
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory
WARBURG PINCUS ENERGY (E&P) PARTNERS- B CHISHOLM, LLC
By:	Warburg Pincus Energy (E&P) Partners-B, L.P.,
	its managing member
By:	Warburg Pincus (E&P) Energy GP, L.P., its
	general partner
By:	Warburg Pincus (E&P) Energy LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory
WP ENERGY CHISHOLM HOLDINGS, L.P.
By:	Warburg Pincus (E&P) Energy GP, L.P., its
	general partner
By:	Warburg Pincus (E&P) Energy LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory

6

WP ENERGY PARTNERS CHISHOLM HOLDINGS, L.P.
By:	Warburg Pincus (E&P) Energy GP, L.P., its general partner
By:	Warburg Pincus (E&P) Energy LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

WARBURG PINCUS PRIVATE EQUITY (E&P) XII (A), L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general partner
By:	Warburg Pincus (E&P) XII LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

WP XII CHISHOLM HOLDINGS, L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general partner
By:	Warburg Pincus (E&P) XII LLC, its general partner
By:	Warburg Pincus Partners II (US), L.P., its managing member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

7

WARBURG PINCUS XII (E&P) PARTNERS-2
CHISHOLM, LLC
By:	Warburg Pincus XII (E&P) Partners-2, L.P., its
	managing member
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory
WARBURG PINCUS PRIVATE EQUITY (E&P)
XII-D (A), L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory
WARBURG PINCUS PRIVATE EQUITY (E&P)
XII-E (A), L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name: Harsha Marti
Title: Authorized Signatory

8

WP XII (E&P) PARTNERS (A), L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

9

WARBURG PINCUS XII (E&P) PARTNERS-1, L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS XII (E&P) PARTNERS-2, L.P.
By:	Warburg Pincus (E&P) XII, L.P., its general
	partner
By:	Warburg Pincus (E&P) XII LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its
	managing member
By:	Warburg Pincus & Company US, LLC, its
	general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS (E&P) ENERGY GP, L.P.
By:	Warburg Pincus (E&P) Energy LLC, its general
	partner
By:	Warburg Pincus Partners II (US), L.P., its managing
	member
By:	Warburg Pincus & Company US, LLC, its general
	partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

10

WARBURG PINCUS (E&P) ENERGY LLC
By:	Warburg Pincus Partners II (US), L.P., its managing
	member
By:	Warburg Pincus & Company US, LLC, its general partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS PARTNERS II (US), L.P.
By:	Warburg Pincus & Company US, LLC, its general
	partner
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS & COMPANY US, LLC
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory
WARBURG PINCUS LLC
By:	/s/ Harsha Marti
Name:	Harsha Marti
Title:	Authorized Signatory

11