SEC Form 424B3 filed by Fold Holdings Inc.

Filed pursuant to Rule 424(b)(3)

Registration No. 333-288623

PROSPECTUS SUPPLEMENT NO. 10

(to Prospectus dated August 11, 2025)

Fold Holdings, Inc.

Up to 9,282,287 Shares of Common Stock

This prospectus supplement updates, amends and supplements the prospectus dated August 11, 2025 (as supplemented or amended from time to time, the “Prospectus”), which forms a part of our registration statement on Form S-1 (No. 333-288623). Capitalized terms used in this prospectus supplement and not otherwise defined herein have the meanings specified in the Prospectus.

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 March 4, 2026 (the “Current Report”). Accordingly, we have attached the Current Report to this prospectus supplement.

This prospectus supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except in combination with, the Prospectus, including any amendments or supplements thereto. This prospectus supplement should be read in conjunction with the Prospectus and if there is any inconsistency between the information in the Prospectus and this prospectus supplement, you should rely on the information in this prospectus supplement.

Our Common Stock and Warrants are listed on the Nasdaq Stock Market LLC under the symbols “FLD” and “FLDDW,” respectively. The last reported sales price of our Common Stock and Warrants on the Nasdaq Stock Market LLC on March 3, 2026 were $1.48 per share of Common Stock and $0.12 per Warrant.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page 7 of the Prospectus and other risk factors contained in the documents incorporated by reference therein, to read about factors you should consider before buying our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the Prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is March 4, 2026.

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): March 4, 2026

Fold Holdings, Inc.

(Exact name of registrant as specified in its charter)

(866) 365-3277

Registrant’s telephone number, including area code

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 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 (§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 7.01 Regulation FD Disclosure.

On March 4, 2026, Fold Holdings, Inc. (the "Company", "we", "our", or "us") made a post on X regarding our anticipated upcoming credit card. This filing is being made to elaborate on that post. We currently anticipate that the credit card will be launched in the coming weeks, dependent, among other things, on successful negotiation with, and sign-off on the credit card launch by, our necessary third-party service providers. We cannot guarantee that the credit card will be launched in the time period indicated, or at all.

The information contained in Item 7.01 of this Current Report shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly provided by specific reference in such a filing.

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.