Exhibit 99.1

Footnote 1 to Form 4:

On May 16, 2013, Encore, LLC and Encore II, LLC sold 16,154 and 37,030 shares of Common Stock, respectively, at a weighted average price of $114.5766 per share in open market transactions. On May 17, 2013, Encore, LLC and Encore II, LLC sold an additional 28,692 and 65,773 shares of Common Stock, respectively, at a weighted average price of $113.1752 per share in open market transactions. On May 20, 2013, Encore, LLC and Encore II, LLC sold an additional 8,082 and 18,528 shares of Common Stock, respectively, at a weighted average price of $111.8733 per share in open market transactions. After such sales, Encore, LLC and Encore II, LLC directly beneficially own 1,518,671 and 3,481,329 shares of Common Stock, respectively. Each of Crestview, L.L.C., Crestview Partners GP, L.P., Crestview Partners, L.P., Crestview Partners (PF), L.P., Crestview Holdings (TE), L.P., Encore (ERISA), Ltd., Crestview Partners (ERISA), L.P. and Crestview Offshore Holdings (Cayman), L.P. may be deemed to have beneficial ownership of the 1,518,671 shares of Common Stock directly owned by Encore, LLC. Each of Crestview, L.L.C., Crestview Partners II GP, L.P., Crestview Partners II, L.P., Crestview Partners II (FF), L.P., Crestview Partners II (TE), L.P., Crestview Offshore Holdings II (Cayman), L.P., Crestview Offshore Holdings II (FF Cayman), L.P. and Crestview Offshore Holdings II (892 Cayman), L.P. may be deemed to have beneficial ownership of the 3,481,329 shares of Common Stock directly owned by Encore II, LLC.

Crestview Partners, L.P., Crestview Partners (PF), L.P., Crestview Holdings (TE), L.P., Encore (ERISA), Ltd. and Crestview Offshore Holdings (Cayman), L.P. are the members of Encore, LLC. Crestview Partners (ERISA), L.P. is the sole shareholder of Encore (ERISA), Ltd. Crestview Partners GP, L.P. is the general partner of Crestview Partners, L.P., Crestview Partners (PF), L.P., Crestview Holdings (TE), L.P., Crestview Partners (ERISA), L.P. and Crestview Offshore Holdings (Cayman), L.P. Crestview Partners II GP, L.P. is the general partner of Crestview Partners II, L.P., Crestview Partners II (FF), L.P., Crestview Partners II (TE), L.P., Crestview Offshore Holdings II (Cayman), L.P., Crestview Offshore Holdings II (FF Cayman), L.P. and Crestview Offshore Holdings II (892 Cayman), L.P., each of which is a member of Encore II, LLC. Crestview, L.L.C. is the general partner of Crestview Partners GP, L.P. and Crestview Partners II GP, L.P. The reporting person is a Partner of Crestview, L.L.C.

The reporting person disclaims beneficial ownership of the securities beneficially owned by Encore, LLC and Encore II, LLC except to the extent of his pecuniary interest therein.

CHARTER COMMUNICATIONS, INC. /MO/ 4