HCM IV Acquisition Corp.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31,2025

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number:001-43119

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code:(203) 930-2200

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

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐No ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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 13(a) of the Exchange Act.☒

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statement of the registrant included in the filing reflect the correction of an error to previously issued financial statement.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes☒ No ☐

The registrant’s securities were not listed on any exchange and hadno market value as of the last business day of the second fiscal quarter of 2025. The registrant’s Units begin trading on the Nasdaq Stock Market on February 13, 2026.

As of March 25, 2026, there were 28,750,000 Class A Ordinary Shares, par value $0.0001 per share, and 8,625,000 Class B Ordinary Shares, par value $0.0001 per share, of the registrant issued and outstanding.

TABLE OF CONTENTS

i

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENT

This Report (as defined below), including, without limitation, statement under “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations,” includes forward-looking statement within the meaning of Section 27A of the Securities Act (as defined below) and Section 21E of the Exchange Act (as defined below). These forward-looking statement include, but are not limited to, statement regarding our or our management team’s expectations, hopes, beliefs, intentions or strategies regarding the future. In addition, any statement that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statement. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking.

Forward-looking statement in this Report may include, for example, statement about:

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The forward-looking statements contained in this Report are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, those factors described under the heading “Risk Factors.” Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Additionally, the SEC has adopted new rules and regulations for special purpose acquisition companies (“SPACs”), which became effective on July 1, 2024. The 2024 SPAC Rules require, among other matters, (i) additional disclosures relating to SPAC sponsors and related persons; (ii) additional disclosures relating to SPAC business combination transactions; (iii) additional disclosures relating to dilution and to conflicts of interest involving sponsors and their affiliates in both SPAC initial public offerings and business combination transactions; (iv) additional disclosures regarding projections included in SEC filings in connection with proposed business combination transactions; and (v) the requirement that both the SPAC and its target company be co-registrants for business combination registration statement. In addition, the SEC’s adopting release provided guidance describing circumstances in which a SPAC could become subject to regulation under the Investment Company Act, including its duration, asset composition, business purpose, and the activities of the SPAC and its management team in furtherance of such goals. The 2024 SPAC Rules may materially affect our ability to complete our initial business combination and may increase the costs and time related thereto.

In addition, statements that contain “we believe” and similar statement reflect our beliefs and opinions on the relevant subject. These statements are based on information available to us as of the date of this Report. Although we believe that this information provides a reasonable basis for these statements, this information may be limited or incomplete. Our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all relevant information. These statements are inherently uncertain, and investors are cautioned not to unduly rely on this statement.

iii

GLOSSARY

Unless otherwise stated in this Report, or the context otherwise requires, references to:

iv

Any conversion of the Class B Ordinary Shares described in this Report will take effect as a compulsory redemption of Class B Ordinary Shares and an issuance of Class A Ordinary Shares as a matter of Cayman Islands law.

Any forfeiture of shares, and all references to forfeiture of shares, described in this Report shall take effect as a surrender of shares for no consideration as a matter of Cayman Islands law. Any share dividend described in this Report will take effect as a share capitalization as a matter of Cayman Islands law (that is, an issuance of shares from share premium).

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