X0508 4 2025-12-19 0002057463 GCI Liberty, Inc. GLIBK 0000905853 DUNCAN RONALD A 12300 LIBERTY BOULEVARD ENGLEWOOD CO 80112 1 1 President and CEO 0 Series C GCI Group Common Stock 2025-12-19 4 F 0 174.0000 36.3900 D 110177.0000 D Series C GCI Group Common Stock 557.0000 I By 401(k) Savings Plan Series C GCI Group Common Stock 20578.0000 I By 560 Company, Inc. Series C GCI Group Common Stock 2022.0000 I By Missy, LLC Series C GCI Group Common Stock 1162.0000 I By RAD, LLC Series C GCI Group Common Stock 7516.0000 I By Spouse The number of shares reported as held in the Reporting Person's 401(k) is based on a statement from the Plan Administrator dated as of November 30, 2025. The Reporting Person owns 55% of 560 Company, Inc. and has voting and dispositive power over these shares. A trust (the "Trust") which the Reporting Person's spouse serves as trustee and his adult daughter is the principal beneficiary owns the remaining 45% of 560 Company, Inc. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, RAD, LLC has a 25% ownership interest in and is the managing member of Missy, LLC. The Reporting Person's spouse has a 25% ownership interest in Missy, LLC and the Reporting Person's adult daughter holds the remaining 50% ownership interest in Missy, LLC. Accordingly, the Reporting Person may be deemed to be the indirect beneficial owner of certain Issuer's securities owned by Missy, LLC. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein. The Reporting Person has a 0.1% ownership interest in and is the controlling member of RAD, LLC and the Trust holds the remaining 99.9% ownership interest of RAD, LLC. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein. The Reporting Person disclaims beneficial ownership of these shares owned by his spouse. /s/ Brittany A. Uthoff as Attorney in Fact for Ronald A. Duncan 2025-12-23