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WideOpenWest, Inc.

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Your Vote Counts! Smartphone users Point your camera here and vote without entering a control number V1.1 For complete information and to vote, visit www.ProxyVote.com Control # V03009-P86090 WIDEOPENWEST, INC. 7887 EAST BELLEVIEW AVENUE SUITE 1000 ENGLEWOOD, CO 80111 WIDEOPENWEST, INC. 2023 Annual Meeting Vote by May 15, 2023 11:59 PM ET You invested in WIDEOPENWEST, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 16, 2023. Vote Virtually at the Meeting* May 16, 2023 10:00 AM EDT Virtually at: www.virtualshareholdermeeting.com/WOW2023 *Please check the meeting materials for any special requirements for meeting attendance. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 2, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. Voting Items Board Recommends V03010-P86090 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Election of Directors Nominees: 1c. Brian Cassidy 1a. Gunjan Bhow 2. Ratify the appointment of BDO USA, LLP as the Company’s independent registered public accounting firm for 2023. 1b. Jill Bright 3. Approve, by non-binding advisory vote, the Company’s executive compensation. 4. Approve an amendment to the WideOpenWest, Inc.’s 2017 Omnibus Incentive Plan. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. For For For For For For