Amendment to Securities Purchase Agreement, dated September 27, 2024, by and among Grayson Mill Holdings II, LLC, Grayson Mill Holdings III, LLC, Grayson Mill Intermediate HoldCo II, LLC, Grayson Mill Intermediate HoldCo III, LLC, WPX Energy Williston, LLC and Devon Energy Corporation

AMENDMENT TO

SECURITIES PURCHASE AGREEMENT

This Amendment to Securities Purchase Agreement (this “Amendment”), dated as of September 27, 2024, is made and entered into by and among Grayson Mill Holdings II, LLC, a Delaware limited liability company (“GM II Seller”) and Grayson Mill Holdings III, LLC, a Delaware limited liability company (“GM III Seller”, and together with the GM II Seller, each a “Seller” and collectively the “Sellers”); Grayson Mill Intermediate HoldCo II, LLC (“GM II Subject Company”) and Grayson Mill Intermediate HoldCo III, LLC (“GM III Subject Company”, and together with the GM II Subject Company, each individually a “Subject Company” and collectively the “Subject Companies”); WPX Energy Williston, LLC, a Delaware limited liability company (“Purchaser”); and Devon Energy Corporation, a Delaware corporation (“Parent”, and together with Purchaser, each individually a “Purchaser Party” and collectively the “Purchaser Parties”). Each of the Sellers, Subject Companies, and Purchaser Parties are sometimes referred to individually as a “Party” and collectively as the “Parties”. Capitalized terms used but not defined in this Amendment shall have the meanings given to such terms in the SPA (as hereinafter defined).

WHEREAS, Sellers, Subject Companies and Purchaser Parties are parties to that certain Securities Purchase Agreement dated as of July 8, 2024 (as the same may be amended or supplemented from time to time, the “SPA”);

WHEREAS, the Parties desire to amend the SPA in the manner and upon the terms and conditions hereafter set forth;

NOW, THEREFORE, in consideration of the Closing of the transactions contemplated under the SPA, the mutual promises and covenants set forth herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows:

“Keeper, DBT, Fivetran, iLand, Snowflake, W Energy Software ERP system”.

“(m) increased by an amount equal to $273,000.00.”

“Notwithstanding anything to the contrary set forth in this Agreement, Seller agrees to provide Purchaser with access to Seller’s IT applications as follows: (i) access to graysonmillenergy.onmicrosoft.com and (ii) use of graysonmillenergy.com for internal domain authentication, in each case, until March 31, 2025. The foregoing access and use shall be limited to such access and use as is reasonably necessary for business continuity of the Subject Companies and transition to Purchaser’s systems and software. Further, notwithstanding anything to the contrary set forth in this Agreement, for a period of sixty (60) days following Closing, Seller agrees that it will not, and will not allow any Person to, delete, remove, modify or otherwise change the “General Inquiry” phone number, the “Emergency Line” phone number or the information and/or links on the Owner Relations page on www.graysonmillenergy.com, and for the foregoing 60-day period, the “General Inquiry” phone number, the “Emergency Line” phone number and the information and links on the Owner Relations page will remain as the same appear on www.graysonmillenergy.com as of the Closing Date.”

[Signature pages follow.]

IN WITNESS WHEREOF, this and Amendment has been signed by each of the Parties as of its date of execution.

GM II SELLER:

Grayson Mill Holdings II, LLC

By: /s/ Eric Bayes

Name: Eric Bayes

Title: Chief Executive Officer

GM III SELLER:

Grayson Mill Holdings III, LLC

By: /s/ Eric Bayes

Name: Eric Bayes

Title: Chief Executive Officer

GM II SUBJECT COMPANY:

Grayson Mill Intermediate HoldCo II, LLC

By: /s/ Eric Bayes

Name: Eric Bayes

Title: Chief Executive Officer

GM III SUBJECT COMPANY:

Grayson Mill Intermediate HoldCo III, LLC

By: /s/ Eric Bayes

Name: Eric Bayes

Title: Chief Executive Officer

PURCHASER:

WPX Energy Williston, LLC

By: /s/ David G. Harris

Name: David G. Harris

Title: Executive Vice President

PARENT:

DEVON ENERGY CORPORATION

By: /s/ David G. Harris

Name: David G. Harris

Title: Executive Vice President and Chief Corporate

Development Officer