Cardinal Infrastructure Group Inc.

Item 3.02 Unregistered Sales of Equity Securities. On October 1, 2026 (the “Closing Date”), Cardinal Infrastructure Group Inc., a Delaware corporation (the “Company”), consummated its acquisition (the “Acquisition”) of Allied Paving Contractors, Inc. (“Allied Paving”). The Company paid approximately $115.0 million as consideration for the Acquisition, which consisted of (i) an aggregate of approximately $88.9 of cash and (ii) 1,006,796 shares of the Company’s Class A Common Stock, par value $0.0001 per share (the “Shares”). The consideration is subject to customary post-closing adjustments. The offer and sale of the Shares were made in reliance on the exemption afforded by Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”) and corresponding provisions of state securities or “blue sky” laws. The Shares were not registered under the Securities Act or any state securities laws and may not be reoffered or resold in the United States absent registration with the Securities and Exchange Commission or an applicable exemption from the registration requirements. The issuance and sale of the Shares did not involve a public offering and were made without general solicitation or general advertising. In addition, each of the recipients of the Shares made representations and warranties to the Company regarding, among other things, as to their status as an accredited investor and investment intent.

Item 7.01 Regulation FD Disclosure. On October 1, 2026, the Company issued a press release announcing the completion of the acquisition of Allied Paving. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1 and incorporated by reference herein. The information in this Item 7.01 shall not be deemed “filed” for purposes of Section 18 of 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 or the Securities Exchange Act of 1934, as amended, except as expressly set forth by specific reference in such a filing.