Exhibit 10.3

JOINDER AGREEMENT

This Joinder Agreement dated as of April 30, 2012 (this “Agreement”), is between
ARP Barnett Pipeline, LLC, a Delaware limited liability company (the “New
Guarantor”), and Wells Fargo Bank, National Association, in its capacity as
administrative agent under the Credit Agreement (defined below) (in such
capacity, the “Administrative Agent”). Capitalized terms used in this Agreement
without definition have the meanings assigned to those terms in the Guaranty,
the Security Agreement, and the Credit Agreement.

RECITALS

A. Pursuant to an Amended and Restated Credit Agreement dated as of March 5,
2012 (as amended, amended and restated, supplemented or otherwise modified from
time to time, the “Credit Agreement”), among Atlas Resource Partners, L.P., a
Delaware limited partnership (the “Borrower”), the lenders party thereto from
time to time (the “Lenders”), and the Administrative Agent, the Lenders agreed
to make loans and other extensions of credit to the Borrower in an aggregate
principal amount of up to the Maximum Credit Amounts.

B. The Borrower and/or one or more of its Subsidiaries may at any time and from
time to time enter into one or more Secured Swap Agreements with one or more
Secured Swap Providers (as defined in the Security Agreement, defined below).

C. The Borrower and/or one or more of its Subsidiaries may at any time and from
time to time enter into an agreement in respect of Bank Products with a Bank
Products Provider.

D. Pursuant to an Amended and Restated Guaranty dated as of March 5, 2012 (as
amended, restated or otherwise modified from time to time, the “Guaranty”) made
by the Subsidiaries of the Borrower party thereto from time to time (the
“Guarantors”) in favor of the Administrative Agent for the benefit of the
Secured Creditors (as defined in the Guaranty), the Guarantors have guaranteed
the payment of the Indebtedness, and pursuant to an Amended and Restated
Security Agreement dated as of March 5, 2012 (as amended, restated or otherwise
modified from time to time, the “Security Agreement”) made by the Borrower, the
Subsidiaries of Borrower party thereto from time to time (together with the
Borrower, the “Grantors”), and the Agent for the benefit of the Secured
Creditors (as defined in the Security Agreement), the Grantors have granted
security interests in the collateral described therein as security for the
Indebtedness.

E. Section 4.14 of the Guaranty and Section 9.13 of the Security Agreement
provide that additional Material Subsidiaries of the Borrower may become
Guarantors under the Guaranty and Grantors under the Security Agreement by
execution and delivery of an instrument in the form of this Agreement. The New
Guarantor is executing this Agreement in accordance with the requirements of the
Credit Agreement to become a Guarantor under the Guaranty and a Grantor under
the Security Agreement.

Accordingly, the Administrative Agent and the New Guarantor agree as follows:

1. In accordance with Section 4.14 of the Guaranty, the New Guarantor by its
signature below becomes a Guarantor under the Guaranty with the same force and
effect as if

 

1

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originally named as a Guarantor in the Guaranty, and the New Guarantor hereby
(a) ratifies, as of the date hereof, and agrees to all the terms and provisions
of the Guaranty applicable to it as a Guarantor thereunder and (b) represents
and warrants that the representations and warranties made by it as a Guarantor
thereunder are true and correct on and as of the date hereof. Each reference to
a “Guarantor” in the Guaranty will be deemed to include the New Guarantor.

2. In accordance with Section 9.13 of the Security Agreement, the New Guarantor
by its signature below becomes a Grantor under the Security Agreement with the
same force and effect as if originally named therein as a Grantor, and the New
Guarantor hereby (a) ratifies, as of the date hereof, and agrees to all the
terms and provisions of the Security Agreement applicable to it as a Grantor
thereunder and (b) represents and warrants that the representations and
warranties made by it as a Grantor thereunder are true and correct in all
material respects on and as of the date hereof. The Schedules to the Security
Agreement are hereby supplemented by the Schedules attached hereto with respect
to the New Guarantor. In furtherance of the foregoing, the New Guarantor, as
security for the payment and performance in full of the Secured Obligations (as
defined in the Security Agreement), hereby grants to the Administrative Agent,
for the ratable benefit of the Secured Creditors, a security interest in all of
the New Guarantor’s right, title and interest in, to and under the Collateral
(as defined in the Security Agreement) of the New Guarantor. Each reference to a
“Grantor” in the Security Agreement will be deemed to include the New Guarantor.

3. If required, the New Guarantor is, simultaneously with the execution of this
Agreement, executing and delivering such Security Instruments (and such other
documents and instruments) as requested by the Administrative Agent in
accordance with the Credit Agreement.

4. The New Guarantor represents and warrants to the Administrative Agent that:

(a) an executed (or conformed) copy of each of the Loan Documents, the Secured
Swap Agreements and the Bank Products Agreements, if any, has been made
available to a Responsible Officer of the New Guarantor and such Responsible
Officer has a duty to and has read these documents, and has full notice and
knowledge of the terms, conditions and effects thereof. The New Guarantor has,
independently and without reliance upon any Secured Creditor or any information
received from the Secured Creditors, and based upon such documents and
information as the New Guarantor has deemed appropriate, made its own analysis
of the transactions contemplated hereby and the Borrower, the Borrower’s
business, assets, operations, prospects and condition, financial or otherwise,
and any circumstances which may bear upon such transactions, the Borrower or the
obligations and risks undertaken herein with respect to the Indebtedness, and
decision to enter into the Guaranty. The New Guarantor has received the advice
of its attorney in entering into the Guaranty and the other Loan Documents to
which it is a party. The New Guarantor has not relied and will not rely upon any
representations or warranties of the Administrative Agent not embodied in the
Guaranty or any acts heretofore or hereafter taken by the Administrative Agent
(including but not limited to any review by the Administrative Agent of the
affairs of Borrower). The New Guarantor has adequate means to obtain from the
Borrower on a continuing basis information concerning the financial condition
and assets of the Borrower, and the New Guarantor is

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not relying upon any Secured Creditor to provide (and no Secured Creditor will
have a duty to provide) any such information to any Guarantor either now or in
the future; and

(b) the representations and warranties set forth in Article VII of the Credit
Agreement are incorporated herein by reference, the same as if stated verbatim
herein as representations and warranties made by the New Guarantor, and the New
Guarantor, jointly and severally represents and warrants that each of such
representations and warranties are true and correct (which representations and
warranties shall be deemed to have been renewed at the time of each Loan under
the Credit Agreement); provided that each reference in each such representation
and warranty to the Borrower’s knowledge shall, for the purposes of
Section 4(b), be deemed to be a reference to such New Guarantor’s knowledge.

5. This Agreement may be executed in counterparts (and by different parties
hereto on different counterparts), each of which will constitute an original,
but all of which when taken together will constitute a single contract.

6. Except as expressly supplemented by this Agreement, the Guaranty and the
Security Agreement remain in full force and effect.

7. THIS AGREEMENT IS GOVERNED BY, AND WILL BE CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF NEW YORK.

8. This Agreement is a Loan Document for all purposes of the Credit Agreement
and the other Loan Documents.

9. The New Guarantor agrees to execute, acknowledge, deliver, file and record
such further certificates, instruments and documents, and to do all other acts
and things as may be requested by the Administrative Agent as necessary or
advisable to carry out the intents and purposes of this Agreement, the Security
Instruments and the Credit Agreement.

10. All communications and notices to the New Guarantor under the Guaranty and
the Security Agreement must be in writing and given as provided in Section 4.1
of the Guaranty to the address for the New Guarantor set forth under its
signature below.

11. The New Guarantor shall reimburse the Administrative Agent for its
reasonable documented out of-pocket expenses in connection with this Agreement,
including reasonable fees and documented expenses for legal services.

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IN WITNESS WHEREOF, the New Guarantor and the Administrative Agent have duly
executed this Joinder Agreement as of the day and year first above written.

 

ARP BARNETT PIPELINE, LLC By:  

/s/ Sean McGrath

Name:   Sean McGrath Title:   Chief Financial Officer

Address: 1845 Walnut Street, 10th Floor

Philadelphia, Pennsylvania 19118

Attention: Sean McGrath

 

[Signature Page to Joinder Agreement]

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WELLS FARGO BANK, NATIONAL

ASSOCIATION, as Administrative Agent

By:  

/s/ Matthew W. Coleman

Name:  

Matthew W. Coleman

Title:  

Vice President

 

[Signature Page to Joinder Agreement]

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SCHEDULE 4.3

GRANTOR INFORMATION

 

Grantor Name

  

Type of

Organization

  

Jurisdiction

of

Formation

  

Foreign
Qualification

  

EIN

  

Organizational ID
Number

  

Chief Executive

Office

ARP Barnett Pipeline, LLC    Limited Liability Company    DE    N/A   
61-1682295    5145069   

Park Place

Corporate Center

One

1000 Commerce

Drive Suite 400

Pittsburgh, PA

15275

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SCHEDULE 4.4

CHANGE IN CIRCUMSTANCES

None.

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SCHEDULE 4.5

TRADE NAMES

 

Grantor Name

   d/b/a

ARP Barnett Pipeline, LLC

   N/A

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SCHEDULE 4.6

PERFECTION ACTIONS

Uniform Commercial Code Filings

 

1. Secretary of State of the State of Delaware with respect to ARP Barnett
Pipeline, LLC

Control Agreements

None.

Patent, Trademark and Copyright Filings

None.

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SCHEDULE 4.7

OTHER FINANCING STATEMENTS

None.

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SCHEDULE 4.8

LOCATION OF INVENTORY AND EQUIPMENT

Park Place Corporate Center One

1000 Commerce St., 4th Floor

Pittsburgh, PA 15275

613 S. 4th Avenue

Mansfield, TX 76063

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SCHEDULE 4.9

CERTAIN SIGNIFICANT TRANSACTIONS

None.

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SCHEDULE 4.11

DEPOSIT, COMMODITIES AND SECURITIES ACCOUNTS

None

 

     

Key Bank
Account #

  

Wells Fargo
Account #

  

Citibank
Account #

  

JPMorgan
Chase
Account #

  

Bank of
America
Account #

  

Account Type

  

over

$2.5MM

ARP Barnet Pipeline, LLC

                    

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SCHEDULE 4.12

COMMERCIAL TORT CLAIMS

None.

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SCHEDULE 4.13

PLEDGED EQUITY INTERESTS

 

Issuer

  

Form and
Jurisdiction of
Organization

  

Type of Equity Interest

Certificate Information

  

Beneficial Owner

  

% of Interests Pledged

ARP Barnett Pipeline, LLC

   DE LLC   

Membership Interests

Uncertificated

   ARP Barnett, LLC    100%

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SCHEDULE 4.15

PATENT AND TRADEMARKS

None.

 

Mark

   Registration No.