STRL: Material agreement · New financial obligation · Company disclosure

Item 1.01 Entry into a Material Definitive Agreement. On July 2, 2026, Sterling Infrastructure, Inc. (the “Company”), as borrower, and certain of its subsidiaries, as guarantors (the “Subsidiary Guarantors”), entered into a Second Amended and Restated Credit Agreement, dated as of July 2, 2026 (the “Amended Credit Agreement”), with the financial institutions party thereto as lenders (the “Lenders”) and BMO Bank N.A., as administrative agent for the Lenders (the “Agent”), which amends and restates that certain Amended and Restated Credit Agreement, dated as of June 5, 2025 (the “Credit Agreement”), and will mature on July 2, 2031. The Amended Credit Agreement increases borrowing capacity by $1.05 billion and will initially provide for revolving borrowings up to an aggregate principal amount of $1.5 billion (with a $600 million sublimit for the issuance of letters of credit and a $50 million sublimit for swing line loans) (the “Revolving Loans”), which will be used for, among other things, refinancing and prepaying existing indebtedness, capital expenditures, permitted acquisitions and other general corporate purposes. The Amended Credit Agreement provides flexibility with an option to establish an incremental facility (the “Incremental Facility” and, together with the Revolving Loans, the “Credit Facilities”), which may be used to (a) provide one or more tranches of term loans, (b) increase the Revolving Loans or (c) incur indebtedness in the form of pari passu secured indebtedness in an aggregate amount for (a)-(c) not to exceed the greater of (1) $500 million and (2) 100% of the Company’s EBITDA (as such term is defined in the Amended Credit Agreement) on a pro forma basis as of the four fiscal quarter period then ended for which financial statements have been delivere