SUPPLEMENTAL INDENTURE dated as of June 29, 2016, among INTERVAL ACQUISITION CORP. THE SUBSIDIARY GUARANTORS PARTY HERETO and HSBC BANK USA, NATIONAL ASSOCIATION, as Trustee 5.625% Senior Notes due 2023

Exhibit 4.1

SUPPLEMENTAL INDENTURE

dated as of June 29, 2016,

among

INTERVAL ACQUISITION CORP.

THE SUBSIDIARY GUARANTORS PARTY HERETO

and

HSBC BANK USA, NATIONAL ASSOCIATION,

as Trustee

5.625% Senior Notes due 2023

THIS SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), entered into as of June 29, 2016, among INTERVAL ACQUISITION CORP., a Delaware corporation (the “Issuer”), THE GUARANTORS PARTY HERETO (the “Undersigned”), and HSBC BANK USA, NATIONAL ASSOCIATION, as trustee (the “Trustee”).

RECITALS

WHEREAS, the Issuer, the Guarantors party thereto and the Trustee entered into an Indenture, dated as of April 10, 2015 (the “Indenture”), relating to the Issuer’s 5.625% Senior Notes due 2023 (the “Notes”);

WHEREAS, as a condition to the Trustee entering into the Indenture and the purchase of the Notes by the Holders, the Issuer agreed pursuant to the Indenture to cause any Restricted Subsidiary that guarantees or becomes an obligor under the Issuer’s Credit Agreement following the Issue Date to provide Note Guarantees.

AGREEMENT

NOW, THEREFORE, in consideration of the premises and mutual covenants herein contained and intending to be legally bound, the parties to this Supplemental Indenture hereby agree as follows:

Section 1.                                           Capitalized terms used herein and not otherwise defined herein are used as defined in the Indenture.

Section 2.                                           Each of the Undersigned, by its execution of this Supplemental Indenture, agrees to be a Guarantor under the Indenture and to be bound by the terms of the Indenture applicable to Guarantors, including, but not limited to, Article 10 thereof.

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Section 3.                                           This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York.

Section 4                                              This Supplemental Indenture may be signed in various counterparts which together will constitute one and the same instrument.

Section 5                                              This Supplemental Indenture is an amendment supplemental to the Indenture, and the Indenture and this Supplemental Indenture will henceforth be read together.

Section 6                                              The recitals and statements herein are deemed to be those of the Issuer and the Undersigned and not 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 the Guarantees provided by the Guarantors party to this Supplemental Indenture.

[Signature Page Follows]

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