November 5, 2025 - EX-99.6 - S-1: General form for registration of securities under the Securities Act of 1933

Exhibit 99.6

THE TERMS AND CONDITIONS OF THE RIGHTS OFFERING ARE SET FORTH IN THE COMPANY’S PROSPECTUS DATED NOVEMBER 26, 2025 FORMING A PART OF THE COMPANY’S REGISTRATION STATEMENT ON FORM S-1 AND ARE INCORPORATED HEREIN BY REFERENCE. COPIES OF THE REGISTRATION STATEMENT ON FORM S-1 INCLUDING THE PROSPECTUS ARE AVAILABLE ON THE WEBSITE OF THE SECURITIES AND EXCHANGE COMMISSION AT HTTP://WWW.SEC.GOV OR UPON REQUEST FROM D.F. KING & CO., INC. , THE INFORMATION AGENT, BY CALLING (888) 280-6942.

GCI LIBERTY, INC.

SHARES OF SERIES C GCI GROUP COMMON STOCK SUBSCRIBED FOR UPON

EXERCISE OF SERIES C GCI GROUP RIGHTS

NOMINEE HOLDER CERTIFICATION

The undersigned, a custodian bank, broker, dealer, or other nominee holder of subscription rights (the “Series C GCI Group Rights”) to purchase shares of Series C GCI Group common stock, par value $0.01 (the “Series C GCI Group common stock”), of GCI Liberty, Inc. (the “Company”), with each whole Series C GCI Group Right entitling the holder to purchase one share of Series C GCI Group common stock at a subscription price of $[·] for holders of the Company’s Series A GCI Group common stock, par value $0.01 (the “Series A GCI Group common stock”), Series B GCI Group common stock, par value $0.01 (the “Series B GCI Group common stock” and, together with the Series A GCI Group common stock and the Series C GCI Group common stock, the “GCI Group common stock”)), and Series C GCI Group common stock (the “Subscription Price”), pursuant to the rights offering described in the Company’s prospectus dated November 26, 2025 forming a part of the Company’s Registration Statement on Form S-1 (as amended from time to time, together, the “Prospectus”), hereby certifies to the Company and Broadridge Corporate Issuer Solutions, LLC, as Subscription Agent for the rights offering, that:

the undersigned has exercised, on behalf of the beneficial owners thereof (which may include the undersigned), the number of Series C GCI Group Rights to purchase the number of shares of Series C GCI Group common stock specified below pursuant to the basic subscription right entitled by the Series C GCI Group Rights, and on behalf of beneficial owners of Series C GCI Group Rights who have subscribed for the purchase of additional shares of Series C GCI Group common stock pursuant to the oversubscription privilege, listing below a number of shares of Series C GCI Group common stock corresponding to such beneficial owners’ exercised Series C GCI Group Rights; and

to the extent a beneficial owner has elected to subscribe for shares of Series C GCI Group common stock pursuant to an oversubscription privilege, each such beneficial owner’s basic subscription privilege has been exercised in full:


SERIES AND NUMBER OF SHARES OF GCI GROUP COMMON STOCK HELD ON RECORD DATE	NUMBER OF SHARES OF SERIES C GCI GROUP COMMON STOCK SUBSCRIBED FOR PURSUANT TO BASIC SUBSCRIPTION PRIVILEGE	NUMBER OF SHARES OF SERIES C GCI GROUP COMMON STOCK SUBSCRIBED FOR PURSUANT TO OVERSUBSCRIPTION PRIVILEGE
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Name of Custodian Bank, Broker, Dealer, or Other Nominee:

	By:
		Authorized Signature

	Name:
		(Please print or type)

	Title:
		(Please print or type)

Provide the following information if applicable:


Depository Trust Company (“DTC”) Participant Number
	Participant:

	By:
		Authorized Signature

	Name:
		(Please print or type)

	Title:
		(Please print or type)

DTC Subscription Confirmation Number(s)

Form: S-1

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