X0508 4 2025-07-14 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 2025-07-14 5 J 0 79424.0000 0.0000 A 79424.0000 D Series C GCI Group Common Stock 2025-07-14 5 J 0 557.0000 0.0000 A 557.0000 I By 401(k) Savings Plan Series C GCI Group Common Stock 2025-07-14 5 J 0 14870.0000 0.0000 A 14870.0000 I By 560 Company, Inc. Series C GCI Group Common Stock 2025-07-14 5 J 0 1461.0000 0.0000 A 1461.0000 I By Missy, LLC Series C GCI Group Common Stock 2025-07-14 5 J 0 839.0000 0.0000 A 839.0000 I By RAD, LLC Series C GCI Group Common Stock 2025-07-14 5 J 0 5431.0000 0.0000 A 5431.0000 I By Spouse On July 14, 2025, Liberty Broadband Corporation completed the spin-off of the Issuer (the "Spin-Off"), which was effected by the distribution to each holder of its common stock as of 5:00 p.m., New York City time, on June 30, 2025, of 0.20 of a share of the Issuer's Series A, Series B and Series C GCI Group common stock for each whole share of the corresponding series of Liberty Broadband Corporation's common stock, with cash (with no interest) paid in lieu of fractional shares. 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 June 30, 2025, after accounting for the Spin-Off. 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 2025-07-16