SEC Form 424B3 filed by XCF Global Inc.

Filed Pursuant to Rule 424(b)(3) and Rule 424(c)

Registration No. 333-291024

PROSPECTUS SUPPLEMENT NO. 8

(to Prospectus dated December 2, 2025)

XCF Global, Inc.

Up to 187,180,141 Shares of Class A Common Stock

This prospectus supplement supplements the prospectus dated December 2, 2025, (the “Prospectus”), which forms a part of our registration statement on Form S-1 (No. 333-291024). This prospectus supplement is being filed to update and supplement the information in the Prospectus with the information contained in our Form 8-K, filed with the Securities and Exchange Commission (the “SEC”) on May 5, 2026 (the “Form 8-K”). Accordingly, we have attached the Form 8-K to this prospectus supplement. This prospectus supplement should be read in conjunction with the Prospectus, which is to be delivered with this prospectus supplement, and is qualified by reference thereto, except to the extent that the information in this prospectus supplement updates or supersedes the information contained in the Prospectus.

Our common stock is listed on The Nasdaq Stock Market under the symbol “SAFX.” On May 5, 2026, the last reported sale price of our common stock was $0.46 per share. You are urged to obtain current market data and should not use the market price as of May 5, 2026, as a prediction of the future market price of our common stock.

We are an “emerging growth company” and a “smaller reporting company,” as those terms are defined under the federal securities laws, and as such, have elected to comply with certain reduced public company reporting requirements for the registration statement of which this prospectus forms a part and future filings. See “Prospectus Summary – Implications of Being an Emerging Growth Company and Smaller Reporting Company” in the Prospectus.

Investing in our securities involves significant risk. You should carefully read and consider the information referred to under “Risk Factors” beginning on page 11 of the Prospectus and under similar headings in any amendments or supplements to the Prospectus for a discussion of certain risks that you should consider in connection with an investment in our securities.

We may amend or supplement this prospectus from time to time by filing amendments or supplements with the SEC. We urge you to read the entire prospectus, any such amendments or supplements, any free writing prospectuses we may file with the SEC, and any documents incorporated by reference into this prospectus or any prospectus supplement carefully before you make your investment decision.

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

The date of this prospectus supplement is May 6, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 4, 2026

XCF GLOBAL, INC.

(Exact name of registrant as specified in its charter)

(346) 630-4724

(Registrant’s telephone number, including area code)

(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 obligation 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 or Rule 12b-2 of the Securities Exchange Act of 1934.

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 7.01 Regulation FD.

On May 4, 2026, XCF Global, Inc. (“XCF” or the “Company”) updated the Company’s investor presentation (the “Investor Presentation”), attached hereto as Exhibit 99.1. The Investor Presentation will be available under the “Events and Presentations” tab section of the Company’s website,

The information in Item 7.01 of this Current Report (including Exhibit 99.1) is being furnished pursuant to Item 7.01 and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended.

Additional Information and Where to Find It

In connection with the proposed transaction, among the Company, DevvStream, and Southern, the Company will prepare and file relevant materials with the Securities and Exchange Commission (the “SEC”), including a registration statement on Form S-4 that will contain a proxy statement of the Company that also constitutes a prospectus (the “Proxy Statement/Prospectus”). A definitive Proxy Statement/Prospectus will be mailed to stockholders of the Company. The Company, DevvStream, and Southern may also file other documents with the SEC regarding the proposed transaction. This communication is not a substitute for any proxy statement, registration statement or prospectus, or any other document that the Company, DevvStream, and Southern (as applicable) may file with the SEC in connection with the proposed transaction. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, INVESTORS AND SECURITY HOLDERS OF THE COMPANY ARE URGED TO READ CAREFULLY AND IN THEIR ENTIRETY THE PROXY STATEMENT/PROSPECTUS WHEN IT BECOMES AVAILABLE AND ANY OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED BY THE COMPANY WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, IN CONNECTION WITH THE PROPOSED TRANSACTION, WHEN THEY BECOME AVAILABLE BECAUSE THESE DOCUMENTS CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION AND RELATED MATTERS. The Company’s investors and security holders will be able to obtain free copies of the Proxy Statement/Prospectus (when they become available), as well as other filings containing important information about the Company, DevvStream, Southern, and other parties to the proposed transaction, without charge through the website maintained by the SEC at www.sec.gov. Copies of the documents filed with the SEC by the Company will be available free of charge under the tab “Financials” on the “Investor Relations” page of the Company’s website page of the Company’s website at https://xcf.global/investor-relations/financials/sec-filings/ or by contacting the Company’s Investor Relations Department at safx@xcf.global.

Participants in the Solicitation

The Company, DevvStream, Southern, and their respective directors and certain of their respective executive officers and employees may be deemed to be participants in the solicitation of proxies from the Company’s stockholders in connection with the proposed transaction. Information regarding the directors and executive officers of the Company is contained in the Company’s Current Report on Form 8-K/A, filed with the SEC on October 31, 2025, its Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 31, 2026, and in other documents subsequently filed with the SEC. Additional information regarding the participants in the proxy solicitations and a description of their direct or indirect interests, by security holdings or otherwise, will be contained in the Proxy Statement/Prospectus and other relevant materials filed with the SEC (when they become available). These documents can be obtained free of charge from the sources indicated above.

No Offer or Solicitation

This Current Report on Form 8-K is for informational purposes only and is not intended to and does not constitute an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any offer, solicitation or sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K contains “forward-looking” statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Exchange Act that involve substantial risks and uncertainties. All statements, other than historical facts, are forward-looking statements, including: statements regarding the expected timing and structure of the proposed transaction; the ability of the parties to complete the proposed transaction considering the various closing conditions; the expected benefits of the proposed transaction; legal, economic, and regulatory conditions; and any assumptions underlying any of the foregoing. Forward-looking statements concern future circumstances and results and other statements that are not historical facts and are sometimes identified by the words “may,” “will,” “should,” “potential,” “intend,” “expect,” “endeavor,” “seek,” “anticipate,” “estimate,” “overestimate,” “underestimate,” “believe,” “plan,” “could,” “would,” “project,” “predict,” “continue,” “target,” or the negatives of these words or other similar terms or expressions that concern the Company’s, DevvStream’s, or Southern’s expectations, strategy, priorities, plans, or intentions. Forward-looking statements are based upon current plans, estimates, and expectations that are subject to risks, uncertainties, and assumptions. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those indicated or anticipated by such forward-looking statements. We can give no assurance that such plans, estimates, or expectations will be achieved, and therefore, actual results may differ materially from any plans, estimates, or expectations in such forward-looking statements.

Important factors that could cause actual results to differ materially from such plans, estimates, or expectations include, among others: (1) changes in domestic and foreign business, market, financial, political, and legal conditions; (2) the number of stockholders that exercise dissenter’s rights in connection with the Mergers; (3) the occurrence of any event, change or other circumstances that could give rise to the termination of negotiations and any subsequent definitive agreements with respect to the proposed transactions; (4) the outcome of any legal proceedings that may be instituted against the Company, DevvStream, Southern, the combined company or others; (5) the inability of the parties to successfully or timely consummate the Mergers, including the risk that any required regulatory approvals are not obtained, are delayed or are subject to unanticipated conditions that could adversely affect the combined company or the expected benefits of the Mergers or that the approval of stockholders is not obtained; (6) changes to the proposed structure of the proposed transactions that may be required or appropriate as a result of applicable laws or regulations; (7) the ability to meet stock exchange listing standards following the consummation of the proposed transactions; (8) the risk that the proposed transactions disrupts current plans and operations of the Company, DevvStream, or Southern as a result of the announcement and consummation of the proposed transactions; (9) the ability to recognize the anticipated benefits of the proposed transactions, which may be affected by, among other things, competition, the ability of the combined company to grow and manage growth profitably, maintain relationships with customers and suppliers and retain its management and key employees; (10) costs related to the proposed transactions; (11) changes in applicable laws or regulations; (12) risks related to extensive regulation, compliance obligations and rigorous enforcement by federal, state, and non-U.S. governmental authorities; (13) the possibility that the Company, DevvStream, Southern, or the combined company may be adversely affected by other economic, business, and/or competitive factors; (14) risks relating to the Company’s, DevvStream’s, and Southern’s key intellectual property rights; (15) various factors beyond management’s control, including general economic conditions and other risks, uncertainties and factors set forth in the section entitled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in the Company’s most recent Form 10-K for the year ended December 31, 2025 and other filings with the SEC and (16) certain other risks identified and discussed in DevvStream’s other public filings with Canadian securities regulatory authorities, available on DevvStream’s profile on SEDAR+ at www.sedarplus.ca. These risks, as well as other risks associated with the proposed transaction, will be more fully discussed in the Proxy Statement/Prospectus that will be included in the registration statement on Form S-4 that will be filed with the SEC in connection with the proposed transaction. While the list of factors presented here is, and the list of factors to be presented in registration statement on Form S-4 will be, considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward-looking statements. We caution you not to place undue reliance on any of these forward-looking statements as they are not guarantees of future performance or outcomes and that actual performance and outcomes, including, without limitation, our actual results of operations, financial condition and liquidity, and the development of new markets or market segments in which we operate, may differ materially from those made in or suggested by the forward-looking statements contained in this communication.

Any forward-looking statements speak only as of the date of this communication. Neither the Company, DevvStream, nor Southern undertakes any obligation to update any forward-looking statements, whether as a result of new information or developments, future events, or otherwise, except as required by law. Neither future distribution of this communication nor the continued availability of this communication in archive form on the Company’s website should be deemed to constitute an update or re-affirmation of these statements as of any future date

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

SIGNATURE

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.

Exhibit 99.1