Document:

EX-10.21

 Exhibit 10.21 

ARDELYX, INC. 

NON-EMPLOYEE DIRECTOR COMPENSATION PROGRAM 

Non-employee members of the board of directors (the “Board”) of Ardelyx, Inc. (the “Company”)
shall be eligible to receive cash and equity compensation as set forth in this Non-Employee Director Compensation Program (this “Program”), which is being adopted pursuant to the Board’s resolutions on May 23, 2014.
The cash and equity compensation described in this Program shall be paid or be made, as applicable, automatically and without further action of the Board, to each member of the Board who is not an employee of the Company or any parent or subsidiary
of the Company (each, a “Non-Employee Director”) who may be eligible to receive such cash or equity compensation, unless such Non-Employee Director declines the receipt of such cash or equity compensation by written notice to
the Company. This Program shall remain in effect until it is revised or rescinded by further action of the Board. This Program may be amended, modified or terminated by the Board at any time in its sole discretion. The terms and conditions of this
Program shall supersede any prior cash and/or equity compensation arrangements for service as a member of the Board between the Company and any of its Non-Employee Directors. This Program shall become effective on the date of the closing of the
initial public offering of Company common stock (the “Effective Date”). 
 1. Cash Compensation. 

(a) Annual Retainers. Each Non-Employee Director shall be eligible to receive an annual retainer of $35,000 for service on the Board.

 (b) Additional Annual Retainers. In addition, a Non-Employee Director shall receive the following annual retainers: 

(i) Chairman of the Board. A Non-Employee Director serving as Chairman of the Board shall receive an additional annual retainer of
$25,000 for such service. 
 (ii) Audit Committee. A Non-Employee Director serving as Chairperson of the Audit Committee shall
receive an additional annual retainer of $20,000 for such service. A Non-Employee Director serving as a member of the Audit Committee (other than the Chairperson) shall receive an additional annual retainer of $10,000 for such service. 

(iii) Compensation Committee. A Non-Employee Director serving as Chairperson of the Compensation Committee shall receive an additional
annual retainer of $15,000 for such service. A Non-Employee Director serving as a member of the Compensation Committee (other than the Chairperson) shall receive an additional annual retainer of $7,500 for such service. 

(vi) Nominating and Corporate Governance Committee. A Non-Employee Director serving as Chairperson of the Nominating and Corporate
Governance Committee shall receive an additional annual retainer of $8,000 for such service. A Non-Employee Director serving as a member of the Nominating and Corporate Governance Committee (other than the Chairperson) shall receive an additional
annual retainer of $4,000 for such service. 
 (c) Payment of Retainers. The annual retainers described in Sections 1(a) and 1(b)
(the “Annual Retainers”) shall be paid by the Company in a single cash lump sum on the date of each annual meeting of the Company’s stockholders after the Effective Date. In the event a Non-Employee Director is initially
elected or appointed to the Board or a committee thereunder on a date other than the date of an annual meeting of the Company’s stockholders, the Annual Retainers paid to such Non-Employee 

 
Director shall be paid on the date of election or appointment, prorated to reflect the number of months (rounded up to the next whole month) remaining until the next annual meeting of the
Company’s stockholders. 
 (d) Election to Receive Stock Options in Lieu of Cash. After the Effective Date, Non-Employee
Directors shall have the ability to elect to receive the Annual Retainers in an award of stock options in lieu of cash pursuant to an election form approved by the Board for such purpose. Non-Employee Directors must complete and deliver the election
form to the Company no later than 15 days prior to the next annual meeting of the Company’s stockholders. In the event that a Non-Employee Director makes an election to receive the Annual Retainers in an award of stock options in lieu of cash,
on the annual meeting of the Company’s stockholders, he or she will automatically be granted a fully vested stock option award to purchase that number of shares of the Company’s common stock such that the award has an aggregate Grant Date
Fair Value (as defined below) equal to the aggregate amount of the Annual Retainers, rounded down to the nearest whole share (subject to adjustment as provided in the Equity Plan (as defined below)). The per share exercise price of each stock option
granted to a Non-Employee Director shall equal the Fair Market Value (as defined in the Equity Plan) of a share of common stock on the date the stock option is granted and shall be exercisable for ten years from the date of grant. For the purposes
of this Program, “Grant Date Fair Value” shall mean the fair value of an award as of the date of grant as determined in accordance with ASC Topic 718, “Share-Based Payment”, using the Black-Scholes pricing model and
the valuation assumptions used by the Company in accounting for options as of such date of grant. The stock option awards shall be granted under and shall be subject to the terms and provisions of the Company’s 2014 Equity Incentive Award Plan
or any other applicable Company equity incentive plan then-maintained by the Company (the “Equity Plan”) and shall be granted subject to the execution and delivery of award agreements, including attached exhibits, in
substantially the forms previously approved by the Board. In the event of any inconsistency between the Plan and this Program, the terms of this Program shall control. 

2. Equity Compensation. Non-Employee Directors shall be granted the equity awards described below. The awards described below shall be
granted under and shall be subject to the terms and provisions of the Equity Plan and shall be granted subject to the execution and delivery of award agreements, including attached exhibits, in substantially the forms previously approved by the
Board. All applicable terms of the Equity Plan apply to this Program as if fully set forth herein, and all grants of stock options hereby are subject in all respects to the terms of the Equity Plan. In the event of any inconsistency between the Plan
and this Program, the terms of this Program shall control. 
 (a) Initial Awards. Each Non-Employee Director who is initially elected
or appointed to the Board after the Effective Date shall be eligible to receive, on the date of such initial election or appointment, an option to purchase 25,000 shares of the Company’s common stock. The awards described in this
Section 2(a) shall be referred to as “Initial Awards.” No Non-Employee Director shall be granted more than one Initial Award. 

(b) Subsequent Awards. A Non-Employee Director who (i) has been serving on the Board for at least six months as of the date of any
annual meeting of the Company’s stockholders after the Effective Date and (ii) will continue to serve as a Non-Employee Director immediately following such meeting, shall be automatically granted, on the date of such annual meeting, an
option to purchase 15,000 shares of the Company’s common stock. The awards described in this Section 2(b) shall be referred to as “Subsequent Awards.” For the avoidance of doubt, a Non-Employee Director elected for
the first time to the Board at an annual meeting of the Company’s stockholders shall only receive an Initial Award in connection with such election, and shall not receive any Subsequent Award on the date of such meeting as well. 

  
 2 

 (c) Termination of Service of Employee Directors. Members of the Board who are employees
of the Company or any parent or subsidiary of the Company who subsequently terminate their service with the Company and any parent or subsidiary of the Company and remain on the Board will not receive an Initial Award pursuant to Section 2(a)
above, but to the extent that they are otherwise eligible, will be eligible to receive, after termination from service with the Company and any parent or subsidiary of the Company, Subsequent Awards as described in Section 2(b) above. 

(d) Terms of Awards Granted to Non-Employee Directors 

(i) Purchase Price. The per share exercise price of each option granted to a Non-Employee Director shall equal the Fair Market Value
(as defined in the Equity Plan) of a share of common stock on the date the option is granted. 
 (ii) Vesting. Each Initial Award
shall vest and become exercisable with respect to 1/36th of the shares subject to the Initial Award on each monthly anniversary of the date of grant, subject to the Non-Employee Director continuing in service on the Board through each such vesting
date. Each Subsequent Award shall vest and become exercisable with respect to 1/12th of the shares subject to the Subsequent Award on each monthly anniversary of the date of grant, which vesting will accelerate in full immediately prior to the next
annual meeting of the Company’s stockholders after the date of grant to the extent unvested as of such date, subject to the Non-Employee Director continuing in service on the Board through each such vesting date. Unless as otherwise specified
herein, no portion of an Initial Award or Subsequent Award which is unvested or unexercisable at the time of a Non-Employee Director’s termination of service on the Board shall become vested and exercisable thereafter. All of a Non-Employee
Director’s Initial Awards and Subsequent Awards, and any other stock options or other equity-based awards outstanding and held by the Non-Employee Director, shall vest in full immediately prior to the occurrence of a Change in Control (as
defined in the Equity Plan), to the extent outstanding at such time. 
 (iii) Term. The term of each stock option granted to a
Non-Employee Director shall be ten (10) years from the date the option is granted. 
 3. Reimbursements. The Company shall
reimburse each Non-Employee Director for all reasonable, documented, out-of-pocket travel and other business expenses incurred by such Non-Employee Director in the performance of his or her duties to the Company in accordance with the Company’s
applicable expense reimbursement policies and procedures as in effect from time to time. 
 * * * * * 

  
 3EX-10.9

 Exhibit 10.9 

MASTER REORGANIZATION AGREEMENT 

This Master Reorganization Agreement (this “Agreement”), dated as of June 6, 2014, is entered into by and among
Eclipse Resources I, LP, a Delaware limited partnership (“Eclipse I”), Eclipse GP, LLC, a Delaware limited liability company (“Eclipse I GP”), EnCap Energy Capital Fund VIII, L.P., a Texas limited
partnership (“EnCap VIII”), EnCap Energy Capital Fund VIII Co-Investors, L.P., a Texas limited partnership (“EnCap VIII Co-Invest”), EnCap Energy Capital Fund IX, L.P., a Texas limited partnership
(“EnCap IX” and, together with EnCap VIII and EnCap VIII Co-Invest, the “Class A Unitholders”), CKH Partners II, L.P., a Pennsylvania limited partnership (“CKH Partners”), The
Hulburt Family II Limited Partnership, a Pennsylvania limited partnership (“Hulburt Family II”), Kirkwood Capital, L.P., a Pennsylvania limited partnership (“Kirkwood” and, together with CKH Partners
and Hulburt Family II, the “Class B Unitholders”), Eclipse Management, L.P., a Delaware limited partnership (the “Class C Unitholder” or “Eclipse Management”), Eclipse Resources
Holdings, L.P., a Delaware limited partnership (“Eclipse Holdings”), Eclipse Resources Corporation, a Delaware corporation (“Eclipse”), and Benjamin W. Hulburt, Christopher K. Hulburt, and Thomas S.
Liberatore (collectively, the “Eclipse Operating Sellers”) (each, a “Party” and collectively, the “Parties”). 

RECITALS 
 WHEREAS,
Eclipse I formed Eclipse on February 13, 2014 to become a holding company for Eclipse I, and Eclipse I contributed $10.00 to Eclipse in exchange for 1,000 shares of common stock, par value $0.01 per share, of Eclipse (the “Common
Stock”); 
 WHEREAS, in anticipation of and in connection with the completion of an initial public offering of Common
Stock (the “Offering”) pursuant to, and as more fully described in, a Registration Statement on Form S-1 filed with the U.S. Securities and Exchange Commission, Registration No. 333-195679 (the “Registration
Statement”), certain restructuring transactions involving Eclipse I and its limited partners have been or will be undertaken (including the formation of Eclipse Management and Eclipse Holdings and the transactions contemplated by this
Agreement) (the “Reorganization”), which transactions are partially described in the Registration Statement; and 

WHEREAS, in connection with the Offering and the Reorganization, the Parties desire to, among other things, (a) establish the
economic terms of certain aspects of the Reorganization, and (b) enter into certain agreements to effectuate the foregoing. 
 NOW,
THEREFORE, in consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, and intending to be legally bound hereby, the Parties hereby agree as follows, and further agree
that the actions set forth in Article II shall be deemed to have been taken and become effective in the order set forth therein. 

ARTICLE I 
 DEFINITIONS

 The terms set forth below in this Article I shall have the meanings ascribed to them below or in the part of this Agreement
referred to below: 
 “Agreement” shall have the meaning set forth in the Preamble. 

“CKH Partners” shall have the meaning set forth in the Preamble. 

“Claims” shall have the meaning set forth in Section 6.1. 

 “Class A Unitholders” shall have the meaning set forth in the Preamble.

 “Class B Unitholders” shall have the meaning set forth in the Preamble. 

“Class C Unitholder” shall have the meaning set forth in the Preamble. 

“Class A Units” shall have the meaning given to such term in the Existing Eclipse I LPA. 

“Class B Units” shall have the meaning given to such term in the Existing Eclipse I LPA. 

“Class C Units” shall have the meaning given to such term in the Existing Eclipse I LPA. 

“Code” shall have the meaning set forth in Section 5.1(a). 

“Common Stock” shall have the meaning set forth in the Recitals. 

“Eclipse” shall have the meaning set forth in the Preamble. 

“Eclipse I” shall have the meaning set forth in the Preamble. 

“Eclipse I Assumption” shall have the meaning set forth in Section 5.1(a). 

“Eclipse I Contribution” shall have the meaning set forth in Section 5.1(a). 

“Eclipse I GP” shall have the meaning set forth in the Preamble. 

“Eclipse I LPA” means that certain Second Amended and Restated Agreement of Limited Partnership of Eclipse I, dated as
of the Effective Date. 
 “Eclipse I Units” shall mean the Class A Units, the Class B Units, and the Class C
Units. 
 “Eclipse Holdings” shall have the meaning set forth in the Preamble. 

“Eclipse Holdings LPA” means that certain Agreement of Limited Partnership of Eclipse Holdings, dated as of the date
hereof. 
 “Eclipse Management” shall have the meaning set forth in the Preamble. 

“Eclipse Operating” means Eclipse Resources Operating, LLC, a Delaware limited liability company. 

“Eclipse Operating Sellers” shall have the meaning set forth in the Preamble. 

“Effective Date” means the date immediately preceding the date of the closing of the Offering. 

“Effective Time” means 12:01 a.m. Central Daylight Time on the Effective Date. 

“EnCap VIII” shall have the meaning set forth in the Preamble. 

“EnCap VIII Co-Invest” shall have the meaning set forth in the Preamble. 

“EnCap IX” shall have the meaning set forth in the Preamble. 

  
 2 

 “Existing Eclipse I LPA” means that certain Amended and Restated
Agreement of Limited Partnership of Eclipse I, dated as of June 10, 2013, as amended. 
 “Hulburt Family II”
shall have the meaning set forth in the Preamble. 
 “Kirkwood” shall have the meaning set forth in the Preamble.

 “Lock-Up Agreement” shall have the meaning set forth in Section 5.2(b). 

“Offering” shall have the meaning set forth in the Recitals. 

“Party and “Parties” shall have the meanings set forth in the Preamble. 

“PublicCo Contributor” shall have the meaning set forth in Section 5.1(b). 

“Registration Statement” shall have the meaning set forth in the Recitals. 

“Released Claims” shall have the meaning set forth in Section 6.1. 

“Released Parties” shall have the meaning set forth in Section 6.1. 

“Releasing Parties” shall have the meaning set forth in Section 6.1. 

“Reorganization” shall have the meaning set forth in the Recitals. 

“Stockholders Agreement” means that certain Stockholders Agreement to be entered into by and among Eclipse, Eclipse
Holdings, the Class A Unitholders, the Class B Unitholders, and the Class C Unitholder. 
 “Tax Indemnifying
Party” shall have the meaning set forth in Section 6.2(a). 
 “Tax Indemnitees” shall have
the meaning set forth in Section 6.2(a). 
 “Tax Treatment” shall have the meaning set forth in
Section 5.1(b). 
 “Transactions” shall have the meaning set forth in Section 5.1(b). 

“Underwriting Agreement” means that certain Underwriting Agreement to be entered into by Eclipse, The Hulburt Family
II Limited Partnership, CKH Partners II, L.P., Kirkwood Capital, L.P., EnCap Energy Capital Fund VIII, L.P., EnCap Energy Capital Fund VIII Co-Investors, L.P., EnCap Energy Capital Fund IX, L.P., Citigroup Global Markets Inc., Goldman,
Sachs & Co., and Morgan Stanley & Co. LLC. 
 “Unitholders” means the Class A Unitholders,
the Class B Unitholders, and the Class C Unitholder. 

  
 3 

 ARTICLE II 

CONTRIBUTIONS AND ACKNOWLEDGEMENTS 

Section 2.1 Initial Contribution of Class A Units, Class B Units, and Class C Units to Eclipse Holdings. Effective as
of the date hereof, and in anticipation of and in connection with the Offering: 
 (a) each of the Class A Unitholders
hereby contributes, transfers, assigns, and delivers to Eclipse Holdings such Class A Unitholder’s right, title, and interest in and to the Class A Units set forth on Schedule I(a) to the Eclipse Holdings LPA and, in exchange for the
foregoing contribution, transfer, assignment, and delivery, Eclipse Holdings hereby issues to each Class A Unitholder a limited partner interest in Eclipse Holdings as specified on Schedule I(b) of the Eclipse Holdings LPA; 

(b) each of the Class B Unitholders hereby contributes, transfers, assigns, and delivers to Eclipse Holdings such Class B
Unitholder’s right, title, and interest in and to the Class B Units set forth on Schedule I(a) to the Eclipse Holdings LPA and, in exchange for the foregoing contribution, transfer, assignment, and delivery, Eclipse Holdings hereby issues to
each Class B Unitholder a limited partner interest in Eclipse Holdings as specified on Schedule I(b) of the Eclipse Holdings LPA; 

(c) the Class C Unitholders hereby contributes, transfers, assigns, and delivers to Eclipse Holdings the Class C
Unitholder’s right, title, and interest in and to the Class C Units set forth on Schedule I(a) to the Eclipse Holdings LPA and, in exchange for the foregoing contribution, transfer, assignment, and delivery, Eclipse Holdings hereby issues to
each Class C Unitholder a limited partner interest in Eclipse Holdings as specified on Schedule I(b) of the Eclipse Holdings LPA; 

(d) Eclipse Holdings hereby accepts, acquires, assumes, and receives the contributions, transfers, assignments, and deliveries
made to it pursuant to this Section 2.1 as a contribution to its capital; 
 (e) Each of the Class A
Unitholders and Class B Unitholders and the Class C Unitholder hereby enters into the Eclipse Holdings LPA and agrees to be bound by the terms, conditions, and provisions thereof; and 

(f) Eclipse Holdings hereby admits each of the Class A Unitholders, each of the Class B Unitholders, and the Class C
Unitholder as a limited partner of Eclipse Holdings. 
 Section 2.2 Sale of Eclipse Operating to Eclipse I. Effective as
of the Effective Time, each Eclipse Operating Seller hereby sells, transfers, assigns, and delivers such Eclipse Operating Seller’s right, title, and interest in and to his membership interests in Eclipse Operating to Eclipse I in exchange for
$42,500.00. As of the date hereof, each Eclipse Operating Seller hereby waives its right of first offer as described in Section 5.1 of the Limited Liability Company Agreement of Eclipse Operating, dated as of December 7, 2010, as amended.

 Section 2.3 Contribution of Remaining Class A Units, Class B Units, Class C Units, and Eclipse I GP Membership Interests
to Eclipse Holdings. Effective as of the Effective Time, and in anticipation of and in connection with the Offering: 

(a) each of the Class A Unitholders hereby contributes, transfers, assigns, and delivers to Eclipse Holdings such
Class A Unitholder’s right, title, and interest in and to the Class A Units set forth on Schedule I(c) to the Eclipse Holdings LPA and, in exchange for the foregoing contribution, transfer, assignment, and delivery, Eclipse Holdings
hereby issues to each Class A Unitholder an additional limited partner interest in Eclipse Holdings as specified on Schedule I(d) of the Eclipse Holdings LPA; 

  
 4 

 (b) each of the Class B Unitholders hereby contributes, transfers, assigns, and
delivers to Eclipse Holdings such Class B Unitholder’s right, title, and interest in and to the Class B Units set forth on Schedule I(c) to the Eclipse Holdings LPA and, in exchange for the foregoing contribution, transfer, assignment, and
delivery, Eclipse Holdings hereby issues to each Class B Unitholder an additional limited partner interest in Eclipse Holdings as specified on Schedule I(d) of the Eclipse Holdings LPA; 

(c) the Class C Unitholder hereby contributes, transfers, assigns, and delivers to Eclipse Holdings the Class C
Unitholder’s right, title, and interest in and to the Class C Units set forth on Schedule I(c) to the Eclipse Holdings LPA and, in exchange for the foregoing contribution, transfer, assignment, and delivery, Eclipse Holdings hereby issues to
the Class C Unitholder an additional limited partner interest in Eclipse Holdings as specified on Schedule I(d) of the Eclipse Holdings LPA; 

(d) EnCap VIII hereby contributes, transfers, assigns, and delivers its right, title, and interest in and to the outstanding
membership interests in Eclipse I GP to Eclipse Holdings; and 
 (e) Eclipse Holdings hereby accepts, acquires, assumes, and
receives the contributions, transfers, assignments, and deliveries made to it pursuant to this Section 2.3 as a contribution to its capital. 

Section 2.4 Contribution of Class A Units, Class B Units, Class C Units, and Eclipse I GP Membership Interests to
Eclipse. Effective immediately following the effectiveness of the transactions contemplated by Section 2.3, and in anticipation of and in connection with the Offering: 

(a) Eclipse Holdings hereby contributes, transfers, assigns, and delivers its right, title and interest in and to the
Class A Units, Class B Units, and Class C Units, and all of the outstanding membership interests in Eclipse I GP, to Eclipse and, in exchange for such contribution, transfer, assignment, and delivery, Eclipse hereby issues to Eclipse Holdings
138,500,000 shares of Common Stock; 
 (b) Eclipse hereby accepts, acquires, assumes, and receives the contributions,
transfers, assignments, and deliveries made to it pursuant to this Section 2.4 as a contribution to its capital; 

(c) Eclipse I hereby admits Eclipse as a limited partner of Eclipse I; and 

(d) Eclipse and Eclipse I GP hereby enter into the Eclipse I LPA and agree to be bound by the terms, conditions, and provisions
thereof. 
 ARTICLE III 

FURTHER ASSURANCES 
 From
time to time after the Effective Time, and without any further consideration, the Parties agree to execute, acknowledge and deliver all such additional, assignments, conveyances, instruments, notices, and other documents, and to do all such other
acts and things, all in accordance with applicable law, as may be necessary or appropriate (a) more fully to assure that the applicable Parties own all of the properties, rights, titles, interests, estates, remedies, powers, and privileges
granted by this Agreement, or which are intended to be so granted, (b) more fully and effectively to vest in the applicable Parties and their respective successors and assigns beneficial and record title to the equity interests contributed and
assigned by this Agreement or intended to be so, (c) more fully to assure compliance with federal and state securities laws in connection with the transactions contemplated by this Agreement, and (d) more fully and effectively to carry out
the purposes and intent of this Agreement. 

  
 5 

 ARTICLE IV 

REPRESENTATIONS AND WARRANTIES 

Section 4.1 Title. Each of the Parties hereby represents and warrants to each other Party that that such Party owns good
and marketable title to the equity interests sold, contributed, transferred, assigned, or delivered pursuant to this Agreement free and clear of any and all liens, encumbrances, charges, options, rights of first refusal, security interests,
equities, claims, or other similar matters of any kind whatsoever (other than those in favor of Eclipse I). 
 Section 4.2 No
Conflicts. Each of the Parties hereby represents and warrants to each other Party that the execution, delivery, and performance by such Party of this Agreement, and the consummation of the transactions contemplated hereby, do not and will
not (i) conflict with or violate the certificate of incorporation, bylaws, certificate of formation, operating agreement, limited partnership agreement, or similar organizational document of such Party, as in effect on the date hereof,
(ii) conflict with or violate any law applicable to such Party, or (iii) result in any breach of, constitute a default (or an event that, with notice or lapse of time or both, would become a default) under, require any consent of or notice
to any person pursuant to, give to others any right of termination, amendment, modification, acceleration, or cancellation of, allow the imposition of any fees or penalties, require the offering or making of any payment or redemption, give rise to
any increased, guaranteed, accelerated, or additional rights or entitlements of any person or otherwise adversely affect any rights of such Party under or pursuant to, any note, bond, mortgage, indenture, agreement, lease, license, permit,
franchise, instrument, obligation, or other contract to which such Party is a party or by which such Party or its assets may be bound or affected. 

Section 4.3 Review and Receipt of Eclipse Holdings LPA. Each of the Class A Unitholders and Class B Unitholders and
the Class C Unitholder hereby represents and warrants to Eclipse Holdings that it has received and reviewed the Eclipse Holdings LPA. 

ARTICLE V 
 TAXES

 Section 5.1 Tax Reporting and Tax Treatment.  

(a) For U.S. federal income tax purposes, the Parties agree: 

(i) to report the transactions described in Section 2.3 as a merger of Eclipse Holdings and Eclipse I (within the
meaning of Treasury Regulation Section 1.708-1(c)), and the resulting partnership of such merger as the continuation of Eclipse I; and 

(ii) to report the transactions described in Section 2.4 as a contribution by Eclipse I of all of the assets of
Eclipse I to Eclipse (the “Eclipse I Contribution”) in exchange for the assumption (within the meaning of Treasury Regulation Section 1.752-1(d) and Treasury Regulation Section 1.752-1(e)) by Eclipse of the
liabilities of Eclipse I (the “Eclipse I Assumption”) and the issuance by Eclipse of its Common Stock to Eclipse I. 

(iii) to report the contributions to, and issuances of the Common Stock by, Eclipse described in Section 2.4 and
the Offering consummated in connection therewith as an integrated transaction described in Section 351 of the Internal Revenue Code of 1986, as amended (the “Code”). 

  
 6 

 (b) Unless required to do so as a result of a determination (as defined in
Section 1313 of the Code), Eclipse Holdings and its limited partners following the consummation of the transactions set forth in Section 2.3, specifically, the Class A Unitholders, the Class B Unitholders, and the Class C
Unitholder (each a “PublicCo Contributor” and collectively, the “PublicCo Contributors”), and Eclipse agree that they will not make any tax filing or otherwise take any position inconsistent with
(i) the U.S. federal income tax reporting of the transactions described in Section 2.3 and Section 2.4 that is contemplated by Section 5.1(a), or (ii) the qualification of the transactions described in
Section 2.4 and the Offering as a transaction described in Section 351 of the Code. The U.S. federal income tax treatment of the transactions described in Section 2.3 and Section 2.4 and the Offering
(collectively, the “Transactions”) that is contemplated by this Section 5.1 is referred to herein as the “Tax Treatment.” If any Party becomes aware of any audit, inquiry, litigation, or
other proceeding relevant to the Tax Treatment, such person shall promptly notify the other Parties of such proceeding, and all Parties shall use reasonable efforts to cooperate with respect to such proceeding. 

Section 5.2 Tax Warranties by PublicCo Contributor. Each PublicCo Contributor represents and warrants to all other PublicCo
Contributors that the statements as set forth below, solely as they relate to the Tax Treatment, are true, correct, and complete as of the date hereof and as of the effective time of the Transactions with respect to such PublicCo Contributor: 

(a) Such PublicCo Contributor does not have any current plan, intention, agreement, arrangement, or understanding, and has not
engaged in any material negotiations, related to: 
 (i) engaging in the Transactions, other than pursuant to this Agreement,
any agreements referenced herein, and the Registration Statement; 
 (ii) selling or otherwise disposing for U.S. federal
income tax purposes of the Common Stock to be received by Eclipse Holdings pursuant to Section 2.4 (or, for U.S. federal income tax purposes, to be treated as having been received by Eclipse I in accordance with
Section 5.1(a)), except as contemplated by this Agreement and the Registration Statement (in connection with the secondary offering of Common Stock by the selling stockholders set forth therein or the exercise of the underwriters’
option to purchase additional shares of Common Stock from such selling stockholders) or with respect to the distribution of Common Stock by Eclipse Holdings (or, for U.S. federal income tax purposes, by Eclipse I) to its limited partners in partial
or complete liquidation of such limited partners’ interests in Eclipse Holdings (or, for U.S. federal income tax purposes, in Eclipse I); 

(iii) acquiring or retaining any rights in the assets of Eclipse I to be treated as having been contributed to Eclipse for U.S.
federal income tax purposes; 
 (iv) allowing any person other than such PublicCo Contributor to exercise control over the
voting of the Common Stock received by such PublicCo Contributor in connection with the Eclipse I Contribution, except as contemplated by the Eclipse Holdings LPA and the Stockholders Agreement; 

(v) creating, extinguishing, or modifying any indebtedness between such PublicCo Contributor and Eclipse or Eclipse I as a
result of the Transactions; or 

  
 7 

 (vi) issuing Common Stock in connection with the Eclipse I Contribution other
than to Eclipse Holdings (or, for U.S. federal income tax purposes, to Eclipse I); 
 (b) To the extent such PublicCo
Contributor is subject to a lock-up letter agreement (the “Lock-Up Agreement”) pursuant to the Underwriting Agreement, such PublicCo Contributor does not have any current plan, intention, agreement, arrangement, or
understanding to request, and has not engaged in material negotiations with respect to, a release or waiver of any of the restrictions set forth in the Lock-Up Agreement with respect to such PublicCo Contributor; 

(c) The aggregate fair market value of the assets of Eclipse I to be treated as having been contributed to Eclipse for U.S.
federal income tax purposes in connection with the Eclipse I Contribution exceeds the sum of any liabilities of Eclipse I that are to be treated as having been assumed by Eclipse for U.S. federal income tax purposes in connection with the Eclipse I
Assumption, including any expenses paid by Eclipse on behalf of the PublicCo Contributors in connection with the Transactions; 

(d) Such PublicCo Contributor is not under the jurisdiction of a court in a Title 11 or similar case (within the meaning of
Section 368(a)(3)(A) of the Code); 
 (e) The purpose of the assumption by Eclipse (for U.S. federal income tax
purposes) of the liabilities of Eclipse I in connection with the Eclipse I Assumption is not to avoid U.S. federal income tax on the exchange but instead a bona fide business purpose, and all such liabilities were incurred in the ordinary course of
business and are associated with the assets of Eclipse I that are to be treated for U.S. federal income tax purposes as having been contributed by Eclipse I to Eclipse in connection with the Eclipse I Contribution; 

(f) The liabilities of Eclipse I to be treated for U.S. federal tax purposes as having been assumed by Eclipse in connection
with the Eclipse I Assumption (or to which the assets of Eclipse I to be treated for U.S. federal tax purposes as having been contributed to Eclipse in connection with the Eclipse I Contribution are subject) will not exceed the adjusted tax basis in
the assets of Eclipse I to be treated for U.S. federal income tax purposes as having been contributed to Eclipse in the Eclipse I Contribution; 

(g) No money or property (other than the Common Stock to be issued pursuant to Section 2.4) will be paid or
distributed to such PublicCo Contributor in connection with the Eclipse I Contribution; 
 (h) To such PublicCo
Contributor’s knowledge, the Transactions will occur pursuant to and in accordance with the terms of this Agreement, any agreements referenced herein and the Registration Statement; 

(i) If such PublicCo Contributor is an entity, to such PublicCo Contributor’s knowledge, no direct or indirect member,
partner, or owner of such PublicCo Contributor has any current plan, intention, agreement, arrangement, or understanding to sell or otherwise dispose for U.S. federal income tax purposes of its direct or indirect interests in such PublicCo
Contributor, except with respect to the partial or complete liquidation of the interests of the limited partners of Eclipse Holdings (or, for U.S. federal income tax purposes, in Eclipse I) in connection with the distribution of Common Stock by
Eclipse Holdings (or, for U.S. federal income tax purposes, by Eclipse I) to its limited partners; 

  
 8 

 (j) Eclipse Holdings (or, for U.S. federal income tax purposes, Eclipse I) will
not retain any rights in the property to be treated as having been transferred to Eclipse for U.S. federal income tax purposes in connection with the Eclipse I Contribution; 

(k) Eclipse Holdings will include in its U.S. federal income tax return (Form 1065 “U.S. Return of Partnership
Income”) for its taxable year that includes the transaction described in Section 2.4 the statement required by Treasury Regulation Section 1.351-3(a); and 

(l) Eclipse Holdings will receive Common Stock of Eclipse approximately equal to the fair market value of the assets of Eclipse
I, net of liabilities of Eclipse I assumed by Eclipse (as more completely described in Section 5.2(c) above). 

Section 5.3 Tax Warranties by Eclipse. Eclipse represents and warrants to the PublicCo Contributors that the statements as
set forth below, solely as they relate to the Tax Treatment, are true, correct, and complete as of the date hereof and as of the effective time of the Transactions: 

(a) To Eclipse’s knowledge, there is no agreement, arrangement, or understanding relating to rights or obligations to vote
its Common Stock, except the Eclipse Holdings LPA and the Stockholders Agreement; 
 (b) There is no current plan, intention,
agreement, arrangement, or understanding for (i) Eclipse to issue any shares of Common Stock or other interests in its equity other than Common Stock to be issued pursuant to the Transactions and Common Stock and other interests in its equity
that may be issued from time to time pursuant to a long-term incentive plan as described in the Registration Statement, (ii) Eclipse, or to Eclipse’s knowledge, Eclipse I, to dispose of any assets held by Eclipse I or any of its
subsidiaries as a result of the Eclipse I Contribution other than in the ordinary course of business (including to fund the acquisition of additional oil and gas properties), (iii) Eclipse or any other person affiliated with Eclipse to redeem
or otherwise reacquire any Common Stock to be issued in connection with the Transactions, or (iv) Eclipse or, to Eclipse’s knowledge, any underwriter to release or waive any of the restrictions set forth in the Lock-Up Agreements; 

(c) Eclipse has not engaged in any material negotiations with respect to any release or waiver of any of the restrictions set
forth in the Lock-Up Agreements; 
 (d) To Eclipse’s knowledge, there is no current plan, intention, agreement,
arrangement, or understanding for any person to exercise any Eclipse stock rights, warrants, or subscriptions with respect to Common Stock other than pursuant to the Transactions; 

(e) The Common Stock to be issued to each PublicCo Contributor as described in Section 2.4 of this Agreement will
be issued and paid in exchange for solely the Eclipse I Contribution; 
 (f) There is no indebtedness between any PublicCo
Contributor and either Eclipse or, to Eclipse’s knowledge, Eclipse I, and there will be no such indebtedness created in favor of any PublicCo Contributor as a result of the Transactions; 

(g) Eclipse has no stock issued or outstanding other than the Common Stock; 

  
 9 

 (h) No money or property (other than the Common Stock to be issued pursuant to
Section 2.4) will be paid or distributed to the PublicCo Contributors in connection with the Eclipse I Contribution; 

(i) Eclipse is not an investment company within the meaning of Section 351(e)(1) of the Code and Treasury Regulation
§1.351-1(c)(1)(ii); 
 (j) To Eclipse’s knowledge, the Transactions will occur pursuant to and in accordance with
the terms of this Agreement, any agreements referenced herein, and the Registration Statement; 
 (k) Eclipse will include in
its U.S. federal income tax return (Form 1120 “U.S. Corporation Income Tax Return”) for its taxable year that includes the transactions described in Section 2.4 the statement required by Treasury Regulation
Section 1.351-3(b); and 
 (l) No Common Stock will be issued by Eclipse for services rendered to or for the benefit of
Eclipse in connection with the transactions described in Section 2.4 or the Offering. 
 ARTICLE VI 

MISCELLANEOUS 

Section 6.1 Release. Effective as of the Effective Date, each of the Parties, on behalf of himself (or herself or itself)
and his (or her or its assigns), heirs, beneficiaries, representatives, agents, and affiliates (the “Releasing Parties”), hereby fully and finally releases, acquits, and forever discharges each of the other Parties and each
of their respective present and former officers, directors, employees, agents, predecessors, successors, assigns, insurers, and attorneys (the “Released Parties”) from any and all claims, causes of action, liabilities,
losses, costs, damages, penalties, charges, expenses, and all other forms of liability or obligation whatsoever, in law or equity, whether asserted or unasserted, known or unknown, foreseen, or unforeseen (“Claims”), arising
prior to the Effective Date and relating to such Releasing Party’s ownership of Eclipse I Units prior to the Effective Date (collectively, the “Released Claims”); provided, however, that the Released Claims
shall exclude any Claims arising from or relating to or in connection with (a) rights or obligations under this Agreement and (b) any claim or right to indemnification or advancement of expenses under the Existing Eclipse I LPA. Each
Releasing Party expressly acknowledges that the release contained herein applies to all Released Claims, whether such Released Claims are known or unknown, and include Released Claims that if known by the releasing party might materially affect its
decision to effect the settlement contained herein. Each Releasing Party has considered and taken into account the possible existence of such Released Claims in determining to execute and deliver this Agreement. Without limiting the generality of
the foregoing, solely with respect to the Released Claims, each Releasing Party expressly waives any and all rights conferred upon it by any statute or rule of law that provides that a release does not extend to claims that the Releasing Party does
not know or suspect to exist in its favor at the time of executing the release, which if known by the Releasing Party would have materially affected the Releasing Party’s settlement with the Released Parties. This Agreement constitutes a
complete defense of any and all Released Claims. Each Releasing Party further agrees not to initiate any litigation, lawsuit, claim, or action against any Released Party with respect to any Released Claim, except that the Releasing Party shall not
be limited hereby from responding to, joining, prosecuting, or being involved in any litigation, lawsuit, claim, or action brought against such Releasing Party in respect of a Released Claim, nor from adjudicating whether or not a Claim constitutes
a Released Claim. 

  
 10 

 Section 6.2 Indemnification. 

(a) Tax Indemnification. From and after the Effective Time, each Party (other than the Eclipse Operating Sellers)
(the “Tax Indemnifying Party”) shall indemnify, defend, and hold harmless each other Party and such other Party’s affiliates, and its and its affiliates’ respective directors, officers, managers, members, partners,
stockholders, employees, agents, and representatives, as applicable (the “Tax Indemnitees”), from any and all damages, losses, obligations, liabilities, payments, costs, and expenses (including reasonable fees and expenses of
outside attorneys, accountants, and other professional advisors and expert witnesses), whether known or unknown, contingent or vested, matured or unmatured, that are or may be suffered or incurred by any such Indemnitee arising out or relating to a
breach of any representation, warranty, covenant, agreement, or obligation of the Indemnifying Party set forth in Article V; provided that the indemnity described in this Section 6.2(a) shall apply only to the extent that
such breach adversely affects the Tax Treatment and such adverse effect results in damages, losses, obligations, liabilities, payments, costs and/or expenses that are suffered or incurred by an Indemnitee. 

(b) Other Indemnification. From and after the Effective Time, each Unitholder shall indemnify, defend, and hold
harmless Eclipse Holdings and its respective partners, managers, officers, and other controlling persons, and to hold each such person or entity harmless from and against any and all damages, claims, lawsuits, losses, liabilities, deficiencies, or
expenses (including reasonable attorney’s fees) incurred by such person or entity by reason of or in connection with any breach by such Unitholder of any representation, warranty, agreement, or covenant of such Unitholder in this Agreement.

 Section 6.3 Delivery of FIRPTA Certificate. Each PublicCo Contributor will deliver to Eclipse a certificate meeting
the requirements of Treasury Regulation § 1.1445-2(b)(2) certifying that such PublicCo Contributor is not a “foreign person” within the meaning of Section 1445 of the Code, duly executed by such PublicCo Contributor. 

Section 6.4 Successors and Assigns; No Third Party Rights. The Agreement shall be binding upon and inure to the benefit of
the Parties and their respective successors and assigns. Except as set forth in Section 6.1 for the Released Parties, this Agreement is not intended to, and does not create, rights in any other person and no person is or is intended to
be a third-party beneficiary of any of the provisions of this Agreement. 
 Section 6.5 Severability. If any of the
provisions of this Agreement are held by any court of competent jurisdiction to contravene, or to be invalid under, the laws of any political body having jurisdiction over the subject matter hereof, such contravention or invalidity shall not
invalidate the entire Agreement. Instead, this Agreement shall be construed as if it did not contain the particular provision or provisions held to be invalid, and an equitable adjustment shall be made and necessary provision added so as to give
effect to the intention of the Parties as expressed in this Agreement at the time of execution of this Agreement. 
 Section 6.6
Waivers and Amendments. Any waiver of any term or condition of this Agreement, or any amendment or supplement to this Agreement, shall be effective only if in writing and signed by the Parties. A waiver of any breach or failure to enforce
any of the terms or conditions of this Agreement shall not in any way affect, limit, or waive a Party’s rights hereunder at any time to enforce strict compliance thereafter with every term or condition of this Agreement. 

  
 11 

 Section 6.7 Entire Agreement. This Agreement, together with the Eclipse
Holdings LPA, constitutes the entire agreement among the Parties pertaining to the transactions contemplated hereby, and together supersede all prior agreements, understandings, negotiations, and discussions, whether oral or written, of the Parties
pertaining thereto. 
 Section 6.8 Governing Law. The Agreement shall be governed by, and construed in accordance with,
the laws of the State of Delaware. 
 Section 6.9 Counterparts. This Agreement may be executed in any number of
counterparts (including by facsimile or other electronic means) with the same effect as if all Parties had signed the same document. 

(Signature pages follow) 

  
 12 

 IN WITNESS WHEREOF, this Agreement has been duly executed by each of the Parties as of the date
first written above. 
  

			
	ECLIPSE RESOURCES I, LP
		
	By:	 	 /s/ Benjamin W. Hulburt

	Name:	 	Benjamin W. Hulburt
	Title:	 	President and Chief Executive Officer
	
	ECLIPSE RESOURCES CORPORATION
		
	By:	 	 /s/ Benjamin W. Hulburt

	Name:	 	Benjamin W. Hulburt
	Title:	 	President and Chief Executive Officer
	
	ECLIPSE RESOURCES HOLDINGS, L.P.
		
	By:	 	Eclipse Holdings GP, LLC,
		 	General Partner of Eclipse Resources Holdings, L.P.
		
	By:	 	 /s/ Benjamin W. Hulburt

	Name:	 	Benjamin W. Hulburt
	Title:	 	President and Chief Executive Officer
	
	ECLIPSE GP, LLC
		
	By:	 	EnCap Energy Capital Fund VIII, L.P.,
		 	Sole Member of Eclipse GP, LLC
		
	By:	 	EnCap Equity Fund VIII GP, L.P.,
		 	General Partner of EnCap Energy Capital Fund VIII, L.P.
		
	By:	 	EnCap Investments L.P.,
		 	General Partner of EnCap Equity Fund VIII GP, L.P.
		
	By:	 	EnCap Investments GP, L.L.C.,
		 	General Partner of EnCap Investments L.P.
		
	By:	 	 /s/ Robert L. Zorich

	Name:	 	Robert L. Zorich
	Title:	 	Managing Partner

 [Master Reorganization Agreement] 

 
			
	CLASS A UNITHOLDERS:
	
	ENCAP ENERGY CAPITAL FUND VIII, L.P.
		
	By:	 	EnCap Equity Fund VIII GP, L.P.,
		 	General Partner of EnCap Energy Capital Fund VIII, L.P.
		
	By:	 	EnCap Investments L.P.,
		 	General Partner of EnCap Equity Fund VIII GP, L.P.
		
	By:	 	EnCap Investments GP, L.L.C.,
		 	General Partner of EnCap Investments L.P.
		
	By:	 	 /s/ Robert L. Zorich

	Name:	 	Robert L. Zorich
	Title:	 	Managing Partner
	
	ENCAP ENERGY CAPITAL FUND VIII CO-INVESTORS, L.P.
		
	By:	 	EnCap Equity Fund VIII GP, L.P.,
		 	General Partner of EnCap Energy Capital Fund VIII Co- Investors, L.P.
		
	By:	 	EnCap Investments L.P.,
		 	General Partner of EnCap Equity Fund VIII GP, L.P.
		
	By:	 	EnCap Investments GP, L.L.C.,
		 	General Partner of EnCap Investments L.P.
		
	By:	 	 /s/ Robert L. Zorich

	Name:	 	Robert L. Zorich
	Title:	 	Managing Partner

 [Master Reorganization Agreement] 

 
			
	ENCAP ENERGY CAPITAL FUND IX, L.P.
		
	By:	 	EnCap Equity Fund IX GP, L.P.,
		 	General Partner of EnCap Energy Capital Fund IX, L.P.
		
	By:	 	EnCap Investments L.P.,
		 	General Partner of EnCap Equity Fund IX GP, L.P.
		
	By:	 	EnCap Investments GP, L.L.C.,
		 	General Partner of EnCap Investments L.P.
		
	By:	 	 /s/ Robert L. Zorich

	Name:	 	Robert L. Zorich
	Title:	 	Managing Partner

 [Master Reorganization Agreement] 

 
			
	CLASS B UNITHOLDERS:
	
	THE HULBURT FAMILY II LIMITED PARTNERSHIP
		
	By:	 	BWH Management Company II, LLC,
		 	General Partner of The Hulburt Family II Limited Partnership
		
	By:	 	 /s/ Benjamin W. Hulburt

	Name:	 	Benjamin W. Hulburt
	Title:	 	Manager
	
	CKH PARTNERS II, L.P.
		
	By:	 	CKH Management Company II, LLC,
		 	General Partner of CKH Partners II, L.P.
		
	By:	 	 /s/ Christopher K. Hulburt

	Name:	 	Christopher K. Hulburt
	Title:	 	Manager
	
	KIRKWOOD CAPITAL, L.P.
		
	By:	 	Mountaineer Ventures, LLC,
		 	General Partner of Kirkwood Capital, L.P.
		
	By:	 	 /s/ Thomas S. Liberatore

	Name:	 	Thomas S. Liberatore
	Title:	 	Manager

 [Master Reorganization Agreement] 

 
			
	CLASS C UNITHOLDER:
	
	ECLIPSE MANAGEMENT, L.P.
		
	By:	 	Eclipse Management GP, LLC,
		 	General Partner of Eclipse Management, L.P.
		
	By:	 	 /s/ Benjamin W. Hulburt

	Name:	 	Benjamin W. Hulburt
	Title:	 	President and Chief Executive Officer

 [Master Reorganization Agreement] 

 
	
	ECLIPSE OPERATING SELLERS:
	  
 /s/ Benjamin W. Hulburt

Benjamin W. Hulburt

	  
 /s/ Christopher K. Hulburt

Christopher K. Hulburt

	  
 /s/ Thomas S. Liberatore

Thomas S. Liberatore

 [Master Reorganization Agreement]

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00232-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00232-of-00352.parquet"}]]