X0508 4 2025-07-17 0002057463 GCI Liberty, Inc. GLIBK 0000905853 DUNCAN RONALD A 12300 LIBERTY BOULEVARD ENGLEWOOD CO 80112 1 1 President and CEO 0 Restricted Stock Units - GLIBK 2025-07-17 5 A 0 7035.0000 0.0000 A 2026-01-05 2026-01-05 Series C GCI Group Common Stock 7035.0000 7035.0000 D Each restricted stock unit represents a contingent right to receive one share of Series C GCI Group Common Stock. 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. In connection with the Spin-Off, all restricted stock unit awards held by the Reporting Person in Liberty Broadband Corporation Series C Common Stock (the "Liberty Broadband restricted stock units") were converted into restricted stock unit awards of the Issuer in the Issuer's Series C GCI Group Common Stock (the "Issuer restricted stock units") as further described in the Remarks. The number of shares of the Issuer's Series C GCI Group Common Stock subject to each Issuer restricted stock unit was determined on July 17, 2025 in a manner designed to preserve the value associated with the original awards prior to the Spin-Off. Otherwise, such Issuer restricted stock units are generally subject to the same terms and conditions applicable to the Liberty Broadband restricted stock units, and such adjustments were approved by the Issuer's board of directors pursuant to Rule 16b-3. /s/ Brittany A. Uthoff as Attorney in Fact for Ronald A. Duncan 2025-07-23