VVNT Vivint Smart Home Inc

As filed with the Securities and Exchange Commission on March 10, 2023.

Registration No. 333-252648

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1

TO

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

4931 North 300 West

Provo, Utah 84604

(801) 377-9111

(Address, including zip code, and telephone number, including area code, of principal executive offices)

Garner B. Meads, III

Chief Legal Officer and Secretary

Vivint Smart Home, Inc.

4931 North 300 West

Provo, Utah 84604

(801) 377-9111

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

Copies to:

Eric M. Swedenburg

Joshua F. Bonnie

Jonathan R. Ozner

Simpson Thacher & Bartlett LLP

425 Lexington Avenue

New York, New York 10017

Telephone: (212) 455-2000

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

If only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please 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.  ☐

EXPLANATORY NOTE

Deregistration of Unsold Securities

This Post-Effective Amendment No.  1 (this “Post-Effective Amendment”) to the Registration Statement on Form S-3 (File No. 333-252648) (the “Registration Statement”) hereby amends the Registration Statement to deregister all unsold securities of Vivint Smart Home, Inc. (the “Company”) registered under the Registration Statement as of the date of this Post-Effective Amendment.

Pursuant to an Agreement and Plan of Merger, dated as of December 6, 2022 (the “Merger Agreement”), by and among the Company, NRG Energy, Inc., a Delaware corporation (“Parent”), and Jetson Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Merger Sub”), Merger Sub merged with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent. The Merger became effective on March 10, 2023 (the “Effective Time”).

As a result of the Merger, the Company is terminating all offerings of its securities pursuant to the Registration Statement by filing this Post-Effective Amendment. In accordance with an undertaking made by the Company in the Registration Statement to remove from registration, by means of a post-effective amendment, any of the Company’s securities registered under the Registration Statement which remain unsold at the termination of the offering, the Company hereby removes from registration any securities registered under the Registration Statement which remained unsold as of the Effective Time, and the Registration Statement is hereby amended, as appropriate, to reflect the deregistration of such securities.

2

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 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 Provo, Utah, on March 10, 2023. No other person is required to sign this Post-Effective Amendment in reliance upon Rule 478 under the Securities Act.