
☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THETRANSITION PERIOD FROMTO Securities registered pursuant to Section 12(b) of the Act: Class A Common Stock, $0.0001 Par Value 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 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 preceding12 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, smaller reporting company, or an emerging growthcompany. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☐Non-accelerated filer☒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 financialaccounting 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 financialreporting 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 statements of the registrant included in the filing reflect thecorrection of an error to previously issued financial statements.☐ 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 theregistrant’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 Exchange Act). YES☐NO☒ The registrant was not a public company as of the last business day of its most recently completed second fiscal quarter and, therefore, cannot calculate the aggregate marketvalue of its voting and non‑voting common equity held by non‑affiliates as of such date. As of March 18, 2026, the number of shares of Registrant’s Class A Common Stockoutstanding was 15,292,984 and the number of shares of Registrant’s Class B Common Stock outstanding was 27,573,875.DOCUMENTS INCORPORATED BY REFERENCEPortions of Cardinal Infrastructure Group Inc’s definitive Proxy Statement for its 2026 annual meeting of stockholders, which will be filed pursuant to Regulation 14A no later than 120 days after the end of the registrant’s fiscal year ended December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K. Table of Contents PART I Item 1.BusinessItem 1A.Risk FactorsItem 1B.Unresolved Staff CommentsItem 1C.CybersecurityItem 2.PropertiesItem 3.Legal ProceedingsItem 4.Mine Safety Disclosures PART II Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecurities45Item 6.[Reserved]47Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations47Item 7A.Quantitative and Qualitative Disclosures About Market Risk64Item 8.Financial Statements and Supplementary Data64Item 9.Changes in and Disagreements With Accountants on Accounting and Financial Disclosure64Item 9A.Controls and Procedures65Item 9B.Other Information66Item 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspections66 PART III Item 10.Directors, Executive Officers and Corporate Governance67Item 11.Executive Compensation67Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters68Item 13.Certain Relationships and Related Transactions, and Director Independence68Item 14.Principal Accountant Fees and Services68 PART IVItem 15. Exhibits and Financial Statement Schedules69Item 16.Form 10-K Summary69 NOTES Unless the context otherwise requires, all references to “Cardinal Group,” the “Company,” “we,”