Cardinal Infrastructure Group Inc.

Item 1.01 Entry into a Material Definitive Agreement. Amendment to Credit Agreement On September 10, 2026, Cardinal Civil Contracting, LLC (the “Borrower”), which is a subsidiary of Cardinal Infrastructure Group Inc. (the “Company”), the other guarantors party thereto, the lenders party thereto and Truist Bank (“Truist Bank”), as administrative agent, issuing bank and swingline lender, entered into a second amendment to the credit agreement (the “Second Amendment”), which amends the Credit Agreement, dated October 1, 2025 (as amended by the First Amendment to the Credit Agreement, dated February 18, 2026, the “Credit Agreement”), by and among the Borrower, the other guarantors from time to time party thereto, the lenders from time to time party thereto and Truist Bank. The Company is not a party to the Second Amendment or the Credit Agreement. The Second Amendment, among other things, (i) establishes a delayed draw term loan facility in an aggregate principal amount of up to $250,000,000, (ii) increases the aggregate revolving commitments from $75,000,000 to $100,000,000 and (iii) modifies certain other provisions of the Credit Agreement. The foregoing description of the Second Amendment is not complete and is qualified in its entirety by reference to the full text of the Second Amendment, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference. Except as modified by the Second Amendment, the terms and conditions in the Credit Agreement remain the same as previously disclosed.