SEC Form POS AM filed by WideOpenWest Inc.

As filed with the Securities and Exchange Commission on December 31, 2025

Registration No. 333-226732

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-3

POST-EFFECTIVE AMENDMENT NO. 1 TO

FORM S-3 REGISTRATION STATEMENT NO. 333-226732

UNDER

THE SECURITIES ACT OF 1933

WideOpenWest, Inc.

(Exact Name of Registrant as Specified in Its Charter)

7887 East Belleview Avenue, Suite 1000

Englewood, CO 80111

(Address of Principal Executive Offices, including Zip Code)

(720) 479-3500

(Registrant’s telephone number, including area code)

John Rego

Chief Financial Officer

7887 East Belleview Avenue, Suite 1000

Englewood, CO 80111

(720) 479-3500

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Christopher May

Gabriel Silva

Ana Sanchez

Simpson Thacher and Bartlett LLP

425 Lexington Avenue

New York, NY 10017

212-455-2000

Approximate date of commencement of proposed sale to the public: Not Applicable.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, check the following box.  ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  ¨

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ¨

DEREGISTRATION OF SECURITIES

This Post-Effective Amendment No. 1 relates to the Registration Statement on Form S-3, File No. 333-226732 (the “Registration Statement”), filed with the Securities and Exchange Commission (the “SEC”) on August 9, 2018 by WideOpenWest, Inc., a Delaware corporation (the “Registrant”), registering the resale of 55,905,512 shares of common stock, par value $0.01 per share, of the Registrant (“Common Stock”) by the selling stockholders named therein. The Registration Statement was declared effective by the SEC on August 21, 2018.

On December 21, 2025, pursuant to the Agreement and Plan of Merger, dated as of August 11, 2025, by and among the Registrant, Bandit Parent, LP, a Delaware limited partnership (“Parent”) and Bandit Merger Sub, Inc., a Delaware corporation and an indirect wholly owned subsidiary of Parent (“Merger Sub”) (the “Merger Agreement”), Merger Sub merged with and into the Registrant (“Merger”), with the Registrant surviving as an indirect wholly owned subsidiary of Parent.

In connection with the Merger, the Registrant is terminating all offers and sales of its securities registered pursuant to its existing registration statements under the Securities Act of 1933, as amended, including the Registration Statement. The Registrant, by filing this Post-Effective Amendment No. 1, hereby terminates the effectiveness of the Registration Statement, and, pursuant to the undertaking contained in the Registration Statement to remove from registration by means of a post-effective amendment any of the securities that remain unsold or unissued at the termination of the offering, the Registrant hereby amends the Registration Statement by deregistering all shares of Common Stock that remain unsold or unissued under the Registration Statement as of the date hereof.

The foregoing description of the Merger, the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by the Merger Agreement, which is included as Exhibit 2.1 in the Registrant’s Form 8-K filed with the SEC on August 11, 2025.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing this Post-Effective Amendment No. 1 to the Registration Statement and has duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Englewood, State of Colorado, on December 31, 2025.

No other person is required to sign this Post-Effective Amendment No. 1 to the Registration Statement in reliance upon Rule 478 under the Securities Act of 1933, as amended.