Exhibit 4.3

CHARTER COMMUNICATIONS OPERATING, LLC

and

CHARTER COMMUNICATIONS OPERATING CAPITAL CORP.,

as Issuers,

CCO HOLDINGS, LLC

and

THE SUBSIDIARY GUARANTORS PARTY HERETO,

as Note Guarantors,

and

The Bank of New York Mellon TRUST COMPANY, N.A.,

as Trustee and Collateral Agent

Twenty-Ninth SUPPLEMENTAL INDENTURE

Dated as of August 24, 2026

7.087% Senior Secured Notes due 2038

7.337% Senior Secured Notes due 2041

TWENTY-NINTH SUPPLEMENTAL INDENTURE dated as of August 24, 2026 (the “Supplemental Indenture”) among Charter Communications Operating, LLC, a Delaware limited liability company (and any successor Person thereto, “CCO”), Charter Communications Operating Capital Corp., a Delaware corporation (“Capital Corp” and, together with CCO, the “Issuers”), CCO Holdings, LLC, a Delaware limited liability company (“CCO Holdings”), the subsidiary guarantors party hereto (together with CCO Holdings, the “Note Guarantors”) and The Bank of New York Mellon Trust Company, N.A., as trustee (together with its successors in such capacity, the “Trustee”) and as collateral agent (together with its successors in such capacity, the “Collateral Agent”).

WHEREAS, the Issuers, CCO Safari II, LLC, a Delaware limited liability company, the Trustee and the Collateral Agent have previously executed and delivered an Indenture, dated as of July 23, 2015 (the “Base Indenture”, as supplemented by the Twenty-Seventh Supplemental Indenture (as defined below) and this Supplemental Indenture, the “Indenture”), providing for the issuance from time to time of one or more series of senior secured debt securities of the Issuers;

WHEREAS, Section 9.01 of the Base Indenture provides that the Issuers, the Note Guarantors and the Trustee may enter into a supplemental indenture to the Base Indenture to, among other things, establish the form or terms of any series of Notes (as defined in the Base Indenture) as permitted by Section 9.01 of the Base Indenture;

WHEREAS, the Issuers and the Note Guarantors, established the form and terms of (i) the Issuers’ series of 7.087% senior secured notes due 2038 (the “2038 Notes”) and (ii) the Issuers’ series of 7.337% senior secured notes due 2041 (the “2041 Notes” and together with the 2038 Notes, the “Notes”), pursuant to the Base Indenture, as supplemented by that certain Twenty-Seventh Supplemental Indenture, dated as of August 12, 2026 (the “Twenty-Seventh Supplemental Indenture”) among the Issuers, CCO Holdings, the Note Guarantors, the Trustee and the Collateral Agent;

WHEREAS, pursuant to the Base Indenture, as supplemented by the Twenty-Seventh Supplemental Indenture, the Issuers initially issued $1,686,285,000 aggregate principal amount of 2038 Notes (the “Initial 2038 Notes”) and $1,627,538,000 aggregate principal amount of 2041 Notes (the “Initial 2041 Notes” and, together with the Initial 2038 Notes, the “Initial Notes”) on August 12, 2026;

WHEREAS, Section 2.01(a) of the Indenture provides that Additional Notes may be issued from time to time in accordance with the provisions of the Indenture by the Issuers without notice to or consent of the Holders and shall be consolidated with and form a single class with the Initial Notes;

WHEREAS, the Issuers and the Note Guarantors desire to execute and deliver this Supplemental Indenture for the purpose of issuing an additional $55,928,000 aggregate principal amount of 2038 Notes (the “Additional 2038 Notes”) and an additional $35,750,000 aggregate principal amount of 2041 Notes (the “Additional 2041 Notes” and, together with the Additional 2038 Notes, the “Additional Notes”), as provided in the Indenture and having the same terms and CUSIP number as the Initial Notes in the forms of Exhibit A-1 or Exhibit A-2, as applicable, to the Twenty-Seventh Supplemental Indenture;

WHEREAS, Section 9.01(14) of the Indenture provides that the Issuers, the Note Guarantors and the Trustee may enter into a supplemental indenture to the Base Indenture to, among other things, provide for or confirm the issuance of Additional Notes; and

WHEREAS, all conditions necessary to authorize the execution and delivery of this Supplemental Indenture and to make it a valid and binding obligation of the Issuers and the Note Guarantors have been satisfied or performed.

NOW, THEREFORE, in consideration of the agreements and obligations set forth herein and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, in order to issue the Additional Notes, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes, as follows:

[Signatures on following page]

Dated as of August 24, 2026

[Signature Page to the Supplemental Indenture]

[Signature Page to the Supplemental Indenture]

SCHEDULE I

Note Guarantors

CCO Holdings, LLC

Bresnan Broadband Holdings, LLC

CCO NR Holdings, LLC

Charter Communications ASC, LLC

Charter Communications, LLC

Charter Communications SSC, LLC

Charter Communications VI HoldCo, LLC

Charter Communications VI, L.L.C.

Charter Distribution, LLC

Charter Leasing Holding Company, LLC

Charter Procurement Leasing, LLC

DukeNet Communications, LLC

Spectrum Advanced Services, LLC

Spectrum Gulf Coast, LLC

Spectrum Mid-America, LLC

Spectrum Mobile Equipment, LLC

Spectrum Mobile, LLC

Spectrum New York Metro, LLC

Spectrum NLP, LLC

Spectrum Northeast, LLC

Spectrum Oceanic, LLC

Spectrum Originals Development, LLC

Spectrum Originals, LLC

Spectrum Pacific West, LLC

Spectrum Reach, LLC

Spectrum RSN, LLC

Spectrum Southeast, LLC

Spectrum Sunshine State, LLC

Spectrum TV Essentials, LLC

Spectrum Wireless Holdings, LLC

Time Warner Cable Enterprises LLC

Time Warner Cable, LLC

TWC Administration LLC

TWC Communications, LLC

TWC SEE Holdco LLC