Exhibit 99.1 Joint Filers' Signatures WARBURG PINCUS PRIVATE EQUITY (E&P) XI-A (BRIGHAM), LLC By: Warburg Pincus Private Equity (E&P) XI-A, L.P., its sole 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS XI (E&P) PARTNERS-A (BRIGHAM), LLC By: Warburg Pincus XI (E&P) Partners-A, L.P., its sole 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WP BRIGHAM 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS (E&P) XI, L.P. 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WP ENERGY BRIGHAM 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WP ENERGY PARTNERS BRIGHAM 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS ENERGY (E&P)-A (BRIGHAM), LLC By: Warburg Pincus Energy (E&P)-A, 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS ENERGY (E&P) PARTNERS-A (BRIGHAM), LLC By: Warburg Pincus Energy (E&P) Partners-A, 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS ENERGY (E&P) PARTNERS-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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS & COMPANY US, LLC By: /s/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory BRIGHAM PARENT 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/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS PARTNERS II (US), L.P. By: Warburg Pincus & Company US, LLC, its general partner By: /s/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Authorized Signatory WARBURG PINCUS LLC By: /s/ Robert B. Knauss Date: 6/16/2020 ----------------------------------------------- ----------------------- Name: Robert B. Knauss Title: Managing Director