Tenth Amendment to Second Amended and Restated Credit Agreement, dated as of March 25, 2019, between Diamondback, as parent guarantor, Diamondback O&G LLC, as borrower, certain other subsidiaries of Diamondback Energy, Inc. as guarantors, Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto

THIS TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment”) dated as of March 25, 2019 is among: DIAMONDBACK ENERGY, INC., a Delaware corporation, as the Parent Guarantor (the “Parent Guarantor”); DIAMONDBACK O&G LLC, a Delaware limited liability company (the “Borrower”); each of the undersigned guarantors (together with the Parent Guarantor, the “Guarantors”); each of the Lenders (as such term is defined in the Credit Agreement referred to below) party hereto; and WELLS FARGO BANK, NATIONAL ASSOCIATION, as administrative agent for the Lenders (in such capacity, together with its successors in such capacity, the “Administrative Agent”).

A.    The Parent Guarantor, the Borrower, the Administrative Agent and the Lenders are parties to that certain Second Amended and Restated Credit Agreement dated as of November 1, 2013 (as amended prior to the date hereof, the “Credit Agreement”), pursuant to which the Lenders have made certain credit available to and on behalf of the Borrower.

B.    The Borrower has requested to increase the Aggregate Elected Commitment Amount from $2,000,000,000.00 to $2,500,000,000.00.

C.    The Borrower has requested and the Lenders signatory hereto have agreed to amend certain provisions of the Credit Agreement, including the amendment and restatement of Annex I thereto in connection with such increase of the Aggregate Elected Commitment Amount, as set forth herein.

D.    Now, therefore, to induce the Administrative Agent and the Lenders to enter into this Amendment and in consideration of the premises and the mutual covenants herein contained, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

Section 1.Defined Terms. Each capitalized term used herein but not otherwise defined herein has the meaning given such term in the Credit Agreement as amended by this Amendment. Unless otherwise indicated, all section references in this Amendment refer to sections of the Credit Agreement.

Section 2.Amendment to Credit Agreement. Annex I to the Credit Agreement is hereby replaced in its entirety with Annex I hereto, and Annex I hereto shall be deemed to be attached as Annex I to the Credit Agreement. After giving effect to this Amendment, and any Borrowings made on the Amendment Effective Date (as defined below), (a) each Lender who holds Loans in an aggregate amount less than its Applicable Percentage of all Loans shall advance new Loans which shall be disbursed to the Administrative Agent and used to repay Loans outstanding to each Lender who holds Loans in an aggregate amount greater than its Applicable Percentage of all Loans, (b) each Lender’s participation in each Letter of Credit, if any, shall be automatically

adjusted to equal its Applicable Percentage, (c) such other adjustments shall be made as the Administrative Agent shall specify so that the Revolving Credit Exposure applicable to each Lender equals its Applicable Percentage of the aggregate Revolving Credit Exposure of all Lenders, and (d) each Lender party hereto waives any break funding payments owing to such Lender that are required under Section 2.07A(b)(ii)(D)(III) and Section 5.02 as a result of the reallocation of Loans and adjustments described in this Section 2.

Section 3.Aggregate Elected Commitment Amount. From and after the Amendment Effective Date until adjusted pursuant to Section 2.07A, the Aggregate Elected Commitment Amount is hereby increased from $2,000,000,000.00 to $2,500,000,000.00. The parties hereto agree that such increase in the Aggregate Elected Commitment Amount is hereby effectuated pursuant to this Section 3 and, notwithstanding Section 2.07A(b)(ii)(F)(I), without any Elected Commitment Amount Increase Agreement.

Section 4.Conditions Precedent. This Amendment shall become effective on the date (the “Amendment Effective Date”) when each of the following conditions is satisfied (or waived in accordance with Section 12.02):

4.1    The Administrative Agent shall have received from the Lenders whose Elected Commitment Amounts (after giving effect to Section 2 and Section 3 hereto) exceed their respective Elected Commitment Amounts in effect prior to the Amendment Effective Date, the Guarantors, and the Borrower, counterparts (in such number as may be requested by the Administrative Agent) of this Amendment signed on behalf of such Person.

4.2    The Administrative Agent shall have received an executed Note for each Lender whose Maximum Credit Amount is increased pursuant to this Amendment, if such Lender has requested a Note to reflect its updated Maximum Credit Amount as set forth on Annex I to the Credit Agreement (as amended hereby), in accordance with Section 2.07A(b)(vi).

4.3    The Administrative Agent and the Lenders shall have received all fees and other amounts due and payable on or prior to the date hereof, including, to the extent invoiced, reimbursement or payment of all documented out-of-pocket expenses required to be reimbursed or paid by the Borrower under the Credit Agreement.

4.4    No Default shall have occurred and be continuing as of the date hereof, after giving effect to the terms of this Amendment.

The Administrative Agent is hereby authorized and directed to declare this Amendment to be effective when it has received documents confirming or certifying, to the satisfaction of the Administrative Agent, compliance with the conditions set forth in this Section 4 or the waiver of such conditions as permitted in Section 12.02. Such declaration shall be final, conclusive and binding upon all parties to the Credit Agreement for all purposes.

Section 5.    Miscellaneous.

5.1    Confirmation. The provisions of the Credit Agreement, as amended by this Amendment, shall remain in full force and effect following the effectiveness of this Amendment.

5.2    Ratification and Affirmation; Representations and Warranties. Each of the Guarantors and the Borrower hereby (a) ratifies and affirms its obligations under, and acknowledges its continued liability under, each Loan Document to which it is a party and agrees that each Loan Document to which it is a party remains in full force and effect as expressly amended hereby and (b) represents and warrants to the Lenders that as of the date hereof, after giving effect to the terms of this Amendment:

(i)    all of the representations and warranties contained in each Loan Document to which it is a party are true and correct in all material respects (or, if already qualified by materiality, Material Adverse Effect or a similar qualification, true and correct in all respects), except to the extent any such representations and warranties are expressly limited to an earlier date, in which case such representations and warranties shall be true and correct in all material respects (or, if already qualified by materiality, Material Adverse Effect or a similar qualification, true and correct in all respects) as of such specified earlier date,

(ii)    no Default or Event of Default has occurred and is continuing, and

(iii)    no event or events have occurred which individually or in the aggregate could reasonably be expected to have a Material Adverse Effect.

5.3    Counterparts. This Amendment may be executed by one or more of the parties hereto in any number of separate counterparts, and all of such counterparts taken together shall be deemed to constitute one and the same instrument. Delivery of this Amendment by facsimile or electronic transmission shall be effective as delivery of a manually executed counterpart hereof.

5.4    NO ORAL AGREEMENT. THIS AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS EXECUTED IN CONNECTION HEREWITH AND THEREWITH REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT UNWRITTEN ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

5.5    GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS.

5.6    Payment of Expenses. In accordance with Section 12.03, the Borrower agrees to pay or reimburse the Administrative Agent for all of its reasonable out-of-pocket expenses incurred in connection with this Amendment, any other documents prepared in connection

herewith and the transactions contemplated hereby, including, without limitation, the reasonable fees, charges and disbursements of counsel to the Administrative Agent.

5.7    Severability. Any provision of this Amendment that is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

5.8    Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns.

5.9    Loan Document. This Amendment is a Loan Document.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the date first written above.