Resolute Energy Corporation Issuer 8.50% Senior Notes Due 2020 SUPPLEMENTAL INDENTURE Dated as of May 12, 2017 Delaware Trust Company Trustee SUPPLEMENTAL INDENTURE

Exhibit 4.1

Resolute Energy Corporation
Issuer

8.50% Senior Notes Due 2020

SUPPLEMENTAL INDENTURE
Dated as of May 12, 2017

Delaware Trust Company
Trustee

SUPPLEMENTAL INDENTURE

SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of May 12, 2017, among Resolute Energy Corporation, a Delaware corporation (the “Company”), the subsidiary guarantors listed on the signature pages hereto (the “Guarantors”) and Delaware Trust Company (as successor to U.S. Bank, National Association), as trustee (the “Trustee”).

W I T N E S S E T H:

WHEREAS, the Company and the Guarantors have heretofore executed and delivered to the Trustee an indenture, dated as of April 25, 2012 (as amended or supplemented to the date hereof, the “Indenture”), providing for the issuance of 8.50% Senior Notes due 2020 (the “Notes”);

WHEREAS, on April 25, 2012, the Company issued $250,000,000 in principal amount of Notes;

WHEREAS, on December 10, 2012, the Company issued $150,000,000 in principal amount of Additional Notes;

WHEREAS, the Company has entered into that certain Purchase Agreement, dated May 9, 2017, by and among the Company, the Guarantors and BMO Capital Markets Corp., as representative of the several initial purchasers named therein, pursuant to which, on the date hereof, the Company is issuing $125,000,000 of Additional Notes as permitted by Section 2.16  and Section 4.07 of the Indenture (the “May 2017 Additional Notes”); and

WHEREAS, pursuant to Section 9.01(a)(ix) of the Indenture, the Trustee, the Company and the Guarantors are authorized to execute and deliver this Supplemental Indenture without the consent of any Holder of Notes.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the Notes as follows:

1.Definitions; Construction.

For all purposes of this Supplemental Indenture, except as otherwise herein expressly provided or unless the context otherwise requires: (i) the terms and expressions used herein shall have the same meanings as corresponding terms and expressions used in the Indenture; and (ii) the words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and not to any particular section hereof.

2.May 2017 Additional Notes.

(a)The Company hereby represents and warrants that attached hereto as Annex A is a true and correct copy of the Officers’ Certificate required by Section 12.04 of the Indenture in connection with the issuance of the May 2017 Additional Notes.

(b)The definition of the term “Additional Notes” set forth in the Indenture is hereby supplemented by adding the following sentence at the end of such definition: “For the avoidance of doubt “Additional Notes” shall include those Notes issued on May 12, 2017 by the Company in an aggregate principal amount of $125,000,000, as more particularly described in the Supplemental Indenture hereto, dated as of May 12, 2017.”

(c)The Company hereby represents and warrants that the issuance of the May 2017 Additional Notes is in compliance with, and, otherwise authorized and permitted, by Section 2.16 and Section 4.07 of the Indenture.

(d)The May 2017 Additional Notes will be (A) Certificate Number A-1 (CUSIP No. 76116A AD0 / ISIN No. US76116AAD00) in the aggregate principal amount of $125,000,000; and (B) Certificate Number S-1 (CUSIP No. U76174 AD0/ ISIN No. USU76174AD08) in the aggregate principal amount of $0.

(e)The May 2017 Additional Notes will be issued at an issue price of 101.625% plus accrued interest from and including May 1, 2017 to, but excluding, the date hereof.

(f)The first Interest Payment Date of the May 2017 Additional Notes will be November 1, 2017.

(g)The May 2017 Additional Notes will be in the form of the Initial Notes and will be subject to a registration rights agreement relating to such Additional Notes (the “Registration Rights Agreement”).

3.Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

4.No Personal Liability of Directors, Officers, Employees and Stockholders. No director, officer, employee, incorporator or stockholder of the Company or any Guarantor, as such, shall have any liability for any obligations of the Company or any guarantor under the Notes (including the May 2017 Additional Notes), the Indenture, this Supplemental Indenture, any Subsidiary Guarantees or the Registration Rights Agreement or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting the May 2017 Additional Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the May 2017 Additional Notes.

5.The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Company and the Guarantors.

6.Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

7.Effect of Headings. The Section headings herein are for convenience only and shall not effect the construction thereof.

[SIGNATURE PAGE FOLLOWS]

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

[Signature Page to First Supplemental Indenture]

[Signature Page to First Supplemental Indenture]

[Signature Page to First Supplemental Indenture]

ANNEX A

OFFICERS’ CERTIFICATE

26

OFFICERS’ CERTIFICATE TO TRUSTEE

May 12, 2017

The undersigned, Chief Executive Officer and Executive Vice President and Chief Financial Officer, respectively, of Resolute Energy Corporation, a Delaware corporation (the “Company”), hereby certify that:

IN WITNESS WHEREOF, the undersigned have executed this Officers’ Certificate as of the date set forth above.