X0206 3 2021-01-07 0 0001090012 DEVON ENERGY CORP/DE DVN 0001804813 Felix Investments Holdings II, LLC 1530 16TH STREET, SUITE 500 DENVER CO 80202 1 0 1 0 0001805689 Felix Energy Investments II, LLC C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 0001636722 EnCap Energy Capital Fund X, L.P. C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 0001663280 Felix STACK Holdings, LLC C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 0001663279 EnCap FEx Holdings, LLC C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 0001565683 EnCap Energy Capital Fund IX, L.P. C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 0001726182 EnCap Partners GP, LLC C/O ENCAP INVESTMENTS L.P. 1100 LOUISIANA STREET, SUITE 4900 HOUSTON TX 77002 1 0 1 0 Common Stock 88738168 D On January 7, 2021, pursuant to the Agreement and Plan of Merger dated as of September 26, 2020 (the "Merger Agreement"), by and among WPX Energy, Inc. (the "WPX"), Devon Energy Corporation (the "Issuer") and East Merger Sub, Inc., a wholly owned subsidiary of the Issuer ("Merger Sub"), Merger Sub merged with and into WPX (the "Merger"), with WPX surviving the Merger as a wholly owned subsidiary of the Issuer. Pursuant to the Merger Agreement, each share of common stock of the Issuer, $0.01 par value, issued and outstanding immediately prior to the effective time of the Merger was automatically converted into the right to receive 0.5165 shares of common stock of the Issuer, $0.10 par value ("Common Stock"). This report reflects 78,978,289 shares of Common Stock held of record and received by Felix Investments Holdings II, LLC ("Felix Investments") upon consummation of the Merger and 9,759,879 shares of Common Stock held of record by Felix STACK Holdings, LLC ("Felix STACK") prior to the date of the Merger. Felix Energy Investments II, LLC ("Felix Energy") is the direct and indirect sole owner of Felix Investments. EnCap Energy Capital Fund X, L.P. ("EnCap Fund X") is a member of Felix Energy that holds the right to appoint two of the three representatives to the board of managers of Felix Energy, and pursuant to the limited liability company agreement of Felix Investments, the members of the Felix Investments board of managers are required to be comprised of the same individuals as the Felix Energy board of managers. EnCap FEx Holdings, LLC ("EnCap FEx") is a member of Felix STACK that holds the right to appoint two of the four representatives to the board of managers of Felix STACK. Each of the two representatives to the board of managers of Felix STACK appointed by EnCap FEx possesses one and one-half votes and the other two representatives to the board of managers of Felix STACK possess one vote each (for a total of five votes for all managers). (continued from footnote 3) EnCap Energy Capital Fund IX, L.P. ("EnCap Fund IX") is the sole managing member of EnCap FEx. Each of EnCap Fund IX and EnCap Fund X is controlled indirectly by EnCap Partners GP, LLC ("EnCap Partners GP"), which is the sole general partner of EnCap Partners, LP ("EnCap Partners"), which is the managing member of EnCap Investments Holdings, LLC ("EnCap Holdings"), which is the sole member of EnCap Investments GP, L.L.C. ("EnCap Investments GP"), which is the sole general partner of EnCap Investments L.P. ("EnCap Investments LP"). EnCap Investments LP is the sole general partner of EnCap Equity Fund IX GP, L.P. ("EnCap Fund IX GP"), which is the sole general partner of EnCap Fund IX, and EnCap Equity Fund X GP, L.P. ("EnCap Fund X GP"), which is the sole general partner of EnCap Fund X. (continued from footnote 4) Each of Felix Energy, EnCap FEx, EnCap Fund IX, EnCap Fund IX GP, EnCap Fund X, EnCap Fund X GP, EnCap Investments LP, EnCap Investments GP, EnCap Holdings, EnCap Partners or EnCap Partners GP may be deemed to share voting or dispositive power over the reported securities held of record by any Reporting Persons under its direct or indirect control. The Reporting Persons disclaim beneficial ownership of these securities except to the extent of any such Reporting Person's pecuniary interest therein. (4) Signed by John D. McCready in his capacity as Chief Executive Officer of Felix Investments Holdings II, LLC. (5) Signed by John D. McCready in his capacity as Chief Executive Officer of Felix Energy Investments II, LLC. (6) Signed by D. Martin Phillips in his capacity as Manager of Felix STACK Holdings, LLC. (7) Signed by D. Martin Phillips in his capacity as Senior Managing Director of EnCap Investments GP, L.L.C., the General Partner of EnCap Investments L.P., the General Partner of EnCap Equity Fund IX GP, L.P., the General Partner of EnCap Energy Capital Fund IX, L.P., the Sole Member of EnCap FEx Holdings, LLC. (8) Signed by Douglas E. Swanson, Jr. in his capacity as Managing Director of EnCap Investments GP, L.L.C., the General Partner of EnCap Investments L.P., the General Partner of EnCap Equity Fund X GP, L.P., the General Partner of EnCap Energy Capital Fund IX, L.P. and EnCap Energy Capital Fund X, L.P. (9) Signed by Douglas E. Swanson, Jr. in his capacity as Managing Director of EnCap Partners GP, LLC. /s/ John D. McCready (4) 2021-01-13 /s/ John D. McCready (5) 2021-01-13 /s/ D. Martin Phillips (6) 2021-01-13 /s/ D. Martin Phillips (7) 2021-01-13 /s/ Douglas E. Swanson, Jr. (8) 2021-01-13 /s/ Douglas E. Swanson, Jr. (9) 2021-01-13