SEC Form 424B3 filed by Complete Solaria Inc.

COMPLETE SOLARIA, INC.

Up to 30,450,000 Shares of Common Stock

This prospectus supplement supplements the prospectus dated July 9, 2025 (as amended or supplemented, the “prospectus”), which forms a part of our registration statement on Form S-1 (No. 333-280973). This prospectus supplement is being filed to update and supplement the information in the prospectus with the information contained in our Current Report on Form 8-K filed with the Securities and Exchange Commission on August 4, 2025 (the “Current Report”). Accordingly, we have attached the Current Report to this prospectus supplement.

The prospectus and this prospectus supplement relate to the potential offer and sale of up to 30,450,000 shares of our common stock, par value $0.0001 per share (the “common stock”), by White Lion Capital, LLC (“White Lion” or the “Selling Securityholder”).

The shares of common stock to which the prospectus and this prospectus supplement relate may be issued to White Lion pursuant to the Common Stock Purchase Agreement dated July 16, 2024 between us and White Lion, as amended by Amendment No. 1 to the Common Stock Purchase Agreement dated July 24, 2024, and as further amended by Amendment No. 2 to the Common Stock Purchase Agreement dated August 14, 2024 (as amended, the “White Lion Purchase Agreement”), establishing an equity line of credit. Such shares of our common stock include (a) up to 30,000,000 shares of common stock that we may elect, in our sole discretion, to issue and sell to White Lion from time to time during the White Lion Commitment Period (as defined below) under the White Lion Purchase Agreement (assuming the shares to be issued are sold at a price of $1.00 per share) and (b) 348,837 shares of common stock (the “Commitment Shares”) issued to White Lion as consideration for it entering into the White Lion Purchase Agreement. See “The White Lion Transaction” below for a description of the White Lion Purchase Agreement and “Selling Securityholder” for additional information regarding White Lion.

The actual number of shares of our common stock issuable to White Lion will vary depending on the then-current market price of shares of our common stock sold to the Selling Securityholder under the White Lion Purchase Agreement and are subject to the further limitations set forth in the White Lion Purchase Agreement.

We are not selling any securities under the prospectus or this prospectus supplement and will not receive any of the proceeds from the sale of shares of common stock by the Selling Securityholder. Additionally, we will not receive any proceeds from the issuance of the Commitment Shares to White Lion. However, we may receive proceeds of up to $30.0 million from the sale of our common stock to the Selling Securityholder pursuant to the White Lion Purchase Agreement after the date of the prospectus (assuming the shares are sold at a price of $1.00 per share). The actual proceeds from White Lion under the White Lion Purchase Agreement may be less than this amount depending on the number of shares of our common stock sold and the price at which the shares of our common stock are sold.

The Selling Securityholder may sell or otherwise dispose of the shares of common stock described in the prospectus in a number of different ways and at varying prices. See “Plan of Distribution” in the prospectus for more information about how the Selling Securityholder may sell or otherwise dispose of the shares of common stock being registered pursuant to the prospectus. The Selling Securityholder is an “underwriter” within the meaning of Section 2(a)(11) of the Securities Act of 1933, as amended.

The Selling Securityholder will pay all brokerage fees and commissions and similar expenses attributable to the sales of its common stock. We will pay the expenses (except brokerage fees and commissions and similar expenses) incurred in registering the shares of common stock offered hereby, including legal and accounting fees. See “Plan of Distribution” in the prospectus.

Our common stock and Public Warrants are listed on The Nasdaq Stock Market under the symbols “SPWR” and “SPWRW,” respectively. On August 5, 2025, the last reported sales price of our common stock was $1.47 per share and the last reported sales price of our Public Warrants was $0.335 per Public Warrant.

This prospectus supplement should be read in conjunction with the prospectus, including any amendments or supplements thereto, which is to be delivered with this prospectus supplement. This prospectus supplement is qualified by reference to the prospectus, including any amendments or supplements thereto, except to the extent that the information in this prospectus supplement updates and supersedes the information contained therein.

This prospectus supplement is not complete without, and may not be delivered or utilized except in connection with, the prospectus, including any amendments or supplements thereto.

We are an “emerging growth company” as defined under U.S. federal securities laws and, as such, have elected to comply with reduced public company reporting requirements. The prospectus and this prospectus supplement comply with the requirements that apply to an issuer that is an emerging growth company.

Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties described in the section titled “Risk Factors” beginning on page 7 of the prospectus, and under similar headings in any amendments or supplements to the prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or passed upon the accuracy or adequacy of the prospectus or this prospectus supplement. Any representation to the contrary is a criminal offense.

Prospectus Supplement dated August 6, 2025

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 1, 2025

Complete Solaria, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (510) 270-2507

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

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 13(a) of the Exchange Act. ☒

Item 1.01 Entry into a Material Definitive Agreement.

Complete Solaria, Inc. (the “Company”) previously announced in its Current Report on Form 8-K filed with the Securities and Exchange Commission (the “SEC”) on July 14, 2023 that the Company and Freedom Acquisition I Corp. (“Freedom”) entered into an agreement dated July 13, 2023 (as previously amended, the “Forward Purchase Agreement”) with Polar Multi-Strategy Master Fund (“Polar”) for OTC Equity Prepaid Forward Transactions.

On August 1, 2025, the Company and Polar entered into the Fifth Amendment to OTC Equity Prepaid Forward Transaction to amend the Forward Purchase Agreement (the “FPA Amendment”). Capitalized terms used herein but not otherwise defined shall have the meanings ascribed to such terms in the Forward Purchase Agreement with Polar attached as Exhibit 10.25 to the Company’s Current Report on Form 8-K filed by the Company with the SEC on July 24, 2023.

The FPA Amendment extends the valuation date (the “Valuation Date”) to the earliest to occur of (a) July 17, 2026, (b) the date specified by Power in a written notice to be delivered to the Company at Polar’s discretion (which Valuation Date shall not be earlier than the day such notice is effective) after the occurrence of any of (w) a VWAP Trigger Event (x) a Delisting Event, (y) a Registration Failure or (z) unless otherwise specified therein, upon any Additional Termination Event and (c) 90 days after delivery by the Company of a written notice in the event that for any 20 trading days during a 30 consecutive trading day-period that occurs at least six months after the closing date of the transactions under the Amended and Restated Business Combination Agreement, dated as of May 26, 2023, among Freedom, the Company and the other parties thereto, the VWAP Price is less than the then applicable Reset Price, provided that a Registration Statement was effective and available for the entire measurement period and remains continuously effective and available during the entire 90 day notice period.

The FPA Amendment further amends the definition of “Settlement Amount Adjustment” to provide that if the expected Settlement Amount determined by the VWAP Price over the 15 scheduled trading days ending on but excluding the valuation date exceeds the Settlement Amount Adjustment, then the Settlement Amount Adjustment shall be deemed to be zero, and that if the Settlement Amount Adjustment exceeds the Settlement Amount, then the Settlement Amount Adjustment shall be paid, at the Company’s option, in cash or shares of the Company’s common stock.

The FPA Amendment also amends the definition of “Cash Settlement Payment Date” to provide that if the Settlement Amount Adjustment exceeds the Settlement Amount, the Company shall remit to Polar the difference between (i) the Settlement Amount Adjustment and (ii) the Settlement Amount. The FPA Amendment further provides that the Settlement Amount will be used solely as a calculation mechanism to determine any liability the Company may owe to Polar via the Settlement Amount Adjustment, and notwithstanding anything to the contrary herein, Polar shall not be required to remit the Settlement Amount to the Company or return any portion of the Prepayment Amount.

The foregoing description of the FPA Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the FPA Amendment filed herewith as Exhibit 10.1 and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.