Execution Version

Exhibit 10.1

TENTH AMENDMENT TO SECOND AMENDED AND RESTATED
CREDIT AGREEMENT
DATED AS OF MARCH 25, 2019
AMONG
DIAMONDBACK ENERGY, INC.,
AS PARENT GUARANTOR

DIAMONDBACK O&G LLC,
AS BORROWER,
THE OTHER GUARANTORS,
WELLS FARGO BANK, NATIONAL ASSOCIATION,
AS ADMINISTRATIVE AGENT,
AND
THE LENDERS PARTY HERETO
 

WELLS FARGO SECURITIES, LLC, AS
SOLE BOOK RUNNER AND SOLE LEAD ARRANGER

JPMORGAN CHASE BANK, N.A., CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH,
GOLDMAN SACHS BANK USA, CITIBANK, N.A. AND BANK OF AMERICA, N.A., AS
CO-DOCUMENTATION AGENTS

CAPITAL ONE, N.A., THE BANK OF NOVA SCOTIA AND U.S. BANK NATIONAL ASSOCIATION AS
AS CO-SYNDICATION AGENTS

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TENTH AMENDMENT TO SECOND AMENDED AND
RESTATED CREDIT AGREEMENT
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”).
R E C I T A L S
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

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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.

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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

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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.

[SIGNATURES BEGIN NEXT PAGE]

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IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed as of the date first written above.
DIAMONDBACK O&G LLC, as Borrower
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

DIAMONDBACK ENERGY, INC.,
as the Parent Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

DIAMONDBACK E&P LLC,
as a Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

ENERGEN CORPORATION,
as a Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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ENERGEN RESOURCES CORPORATION,
as a Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

EGN SERVICES, INC.,
as a Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

RATTLER MIDSTREAM OPERATING LLC,
as a Guarantor
 
 
 
 
 
By:
/s/ Teresa L. Dick
Name:
Teresa L. Dick
Title:
 Chief Accounting Officer, Executive Vice President, and Assistant Secretary

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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WELLS FARGO BANK, NATIONAL ASSOCIATION,
as Administrative Agent and a Lender
 
 
 
 
 
By:
/s/ Todd Fogle
Name:
Todd Fogle
Title:
Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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CAPITAL ONE, NATIONAL ASSOCIATION,
as a Lender
 
 
 
 
By:
/s/ Lyle Levy Jr.
Name:
Lyle Levy Jr.
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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CREDIT SUISSE AG, CAYMAN ISLANDS
BRANCH, as a Lender
 
 
 
 
By:
/s/ Nupur Kumar
Name:
Nupur Kumar
Title:
Authorized Signatory
 
 
 
 
By:
/s/ Marc Zihlmann
Name:
Marc Zihlmann
Title:
Authorized Signatory

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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THE BANK OF NOVA SCOTIA
as a Lender
 
 
 
 
By:
/s/ Marc Graham
Name:
Marc Graham
Title:
Managing Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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U.S. BANK NATIONAL ASSOCIATION,
as a Lender
 
 
 
 
By:
/s/ Tara R. McLean
Name:
Tara R. McLean
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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JPMORGAN CHASE BANK, N. A.,
as a Lender
 
 
 
 
By:
/s/ David Morris
Name:
David Morris
Title:
Authorized Officer

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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GOLDMAN SACHS BANK USA,
as a Lender
 
 
 
 
By:
/s/ Rebecca Kratz
Name:
Rebecca Kratz
Title:
Authorized Signatory

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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CITIBANK, N.A.,
as a Lender
 
 
 
 
By:
/s/ Jeff Ard
Name:
Jeff Ard
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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BANK OF AMERICA, N.A.,
as a Lender
 
 
 
 
By:
/s/ Ronald E. McKaig
Name:
Ronald E. McKaig
Title:
Managing Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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SUNTRUST BANK,
as a Lender
 
 
 
 
By:
/s/ Arize Agumadu
Name:
Arize Agumadu
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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ZIONS BANCORPORATION, N.A. dba
AMEGY BANK, as a Lender
 
 
 
 
By:
/s/ JB Askew
Name:
JB Askew
Title:
Senior Vice President
 
Amegy Bank Division

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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ING CAPITAL LLC,
as a Lender
 
 
 
 
By:
/s/ Scott Lamoreaux
Name:
Scott Lamoreaux
Title:
Director
 
 
 
 
By:
/s/ Juli Bieser
Name:
Juli Bieser
Title:
Managing Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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COMMONWEALTH BANK OF AUSTRALIA,
as a Lender
 
 
 
 
By:
/s/ Emma Raine
Name:
Emma Raine
Title:
Senior Associate

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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BOKF, N.A. DBA BANK OF OKLAHOMA,
as a Lender
 
 
 
 
By:
/s/ John Krenger
Name:
John Krenger
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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BRANCH BANKING AND TRUST COMPANY,
as a Lender
 
 
 
 
By:
/s/ Kelly Graham
Name:
Kelly Graham
Title:
Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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CANADIAN IMPERIAL BANK OF
COMMERCE, NEW YORK BRANCH,
as a Lender
 
 
 
 
By:
/s/ Donovan C. Broussard
Name:
Donovan C. Broussard
Title:
Authorized Signatory
 
 
 
 
By:
/s/ Megan Larson
Name:
Megan Larson
Title:
Authorized Signatory

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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PNC BANK, NATIONAL ASSOCIATION,
as a Lender
 
 
 
 
By:
/s/ Sandra Salazar
Name:
Sandra Salazar
Title:
Managing Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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IBERIABANK,
as a Lender
 
 
 
 
By:
/s/ Moni Collins
Name:
Moni Collins
Title:
Senior Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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WEST TEXAS NATIONAL BANK,
as a Lender
 
 
 
 
By:
/s/ Steve W. Young
Name:
Steve W. Young
Title:
Senior Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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FROST BANK, A TEXAS STATE BANK,
as a Lender
 
 
 
 
By:
/s/ Jack Herndon
Name:
Jack Herndon
Title:
Senior Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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COMPASS BANK
as a Lender
 
 
 
 
By:
/s/ Gabriela Azcarate
Name:
Gabriela Azcarate
Title:
Senior Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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THE TORONTO-DOMINION BANK, NEW
YORK BRANCH, as a Lender
 
 
 
 
By:
/s/ Brian Macfarlane
Name:
Brian Macfarlane
Title:
Authorized Signatory

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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REGIONS BANK,
as a Lender
 
 
 
 
By:
/s/ Stuart Murray
Name:
Stuart Murray
Title:
Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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MIZUHO BANK, LTD,
as a Lender
 
 
 
 
By:
/s/ Donna DeMagistris
Name:
Donna Demagistris
Title:
Authorized Signatory

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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THE HUNTINGTON NATIONAL BANK
as a Lender
 
 
 
 
By:
/s/ Gregory R. Ryan
Name:
Gregory R. Ryan
Title:
Director, Energy Banking

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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SUMITOMO MITSUI BANKING
CORPORATION, as a Lender
 
 
 
 
By:
/s/ Katsuyuki Kubo
Name:
Katsuyuki Kobo
Title:
Managing Director

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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COMERICA BANK
as a Lender
 
 
 
 
By:
/s/ V. Mark Fuqua
Name:
V. Mark Fuqua
Title:
Executive Vice President

SIGNATURE PAGE
TENTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT

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ANNEX I
LIST OF MAXIMUM CREDIT AMOUNTS
Name of Lender
Applicable Percentage
Maximum Credit Amount
Wells Fargo Bank, National Association
6.120000000%
$306,000,000.00
Citibank, N.A.
5.120000000%
$256,000,000.00
Bank of America, N.A.
5.120000000%
$256,000,000.00
Capital One, National Association
5.120000000%
$256,000,000.00
The Bank of Nova Scotia
5.120000000%
$256,000,000.00
U.S. Bank National Association
5.120000000%
$256,000,000.00
Credit Suisse AG, Cayman Islands Branch
5.120000000%
$256,000,000.00
Goldman Sachs Bank USA
5.120000000%
$256,000,000.00
JPMorgan Chase Bank, N.A.
5.120000000%
$256,000,000.00
ING Capital LLC
3.640000000%
$182,000,000.00
SunTrust Bank
3.640000000%
$182,000,000.00
Commonwealth Bank Of Australia
3.640000000%
$182,000,000.00
Branch Banking and Trust Company
3.640000000%
$182,000,000.00
PNC Bank, National Association
3.640000000%
$182,000,000.00
Canadian Imperial Bank of Commerce, New York Branch
3.640000000%
$182,000,000.00
Compass Bank
3.640000000%
$182,000,000.00
The Toronto-Dominion Bank, New York Branch
3.640000000%
$182,000,000.00
Regions Bank
3.640000000%
$182,000,000.00
Mizuho Bank, Ltd.
3.640000000%
$182,000,000.00
Zions Bancorporation, N.A. dba Amegy Bank
2.320000000%
$116,000,000.00
BOKF, N.A., dba Bank of Oklahoma
2.320000000%
$116,000,000.00
Iberiabank
2.320000000%
$116,000,000.00
The Huntington National Bank
2.320000000%
$116,000,000.00
Sumitomo Mitsui Banking Corporation
2.320000000%
$116,000,000.00
Comerica Bank
2.320000000%
$116,000,000.00
Frost Bank, a Texas State Bank
1.600000000%
$80,000,000.00
West Texas National Bank
1.000000000%
$50,000,000.00
Total
100.000000000%
$5,000,000,000.00

Annex I