GCI LIBERTY REPORTS SECOND QUARTER 2025 FINANCIAL RESULTS Exhibit 99.1 Englewood, Colorado, August 7, 2025 – GCI Liberty, Inc. ("GCI Liberty") (Nasdaq: GLIBA, GLIBK) today reported second quarter 2025 results. Headlines include (1): Discussion of Results "GCI delivered strong results during the quarter, reflecting our operating progress and breadth of connectivity services," said GCI Liberty CEO, Ron Duncan. "The strength of our business translated into solid revenue and Adjusted OIBDA growth, which also re ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-42742 GCI Liberty, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of ...