MTZ: Material agreement · New financial obligation · Unregistered securities sale · Leadership change

Item 1.01 Entry into a Material Definitive Agreement. New Term Loan Agreement On July 7, 2026, MasTec, Inc. (the “ Company ”) and MasTec North America, Inc., a subsidiary of the Company (“ MasTec North America ”), entered into a new senior unsecured delayed draw term loan agreement (the “ New Term Loan Agreement ”) by and among the Company and MasTec North America, as borrowers, Bank of America, N.A., as Administrative Agent, and the other lenders party thereto, which provides for $700 million in delayed draw term loan commitments (the “ Term Loan Commitments ”), composed of $400 million of three-year commitments (the “ Three-Year Tranche ”) and $300 million of four-year commitments (the “ Four-Year Tranche ”). Borrowings under the Term Loan Commitments are to be used to finance a portion of the consideration for the Acquisition (as defined below) and fees and expenses incurred in connection therewith and related transactions. The Term Loan Commitments will be automatically and permanently terminated if the closing date (the “ Closing Date ”) of the Acquisition does not occur. The Three-Year Tranche will mature on the three-year anniversary of the Closing Date, and the Four-Year Tranche will mature on the four-year anniversary of the Closing Date. Loans under the Three-Year Tranche are not subject to amortization. Loans under the Four-Year Tranche are subject to amortization in quarterly principal installments (subject to the application of certain prepayments in accordance with the terms of the New Term Loan Agreement) commencing with the first full fiscal quarter ending after the one-year anniversary of the Closing Date, at the rate of 5% per annum, increasing to 10% per annum on the first full fiscal quarter ending after the third-year anniversary of the Closing Date