Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549     FORM 8-K     CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2026     MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter)       Florida   001-08106   65-0829355 (State or Other Jurisdiction of Incorporation)   (Commission File Number)   (IRS Employer Identification No.) 800 S. Douglas Road , 12th Floor Coral Gables , Florida 33134 (Address of Principal Executive Office) Registrant’s telephone number, including area code (305) 599-1800 (Former Name or Former Address, if Changed Since Last Report)     Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:   ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:   Title of each class   Trading symbol(s)   Name of each exchange on which registered Common Stock, $0.10 Par Value   MTZ   New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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 financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐       ITEM 5.07 Submission of Matters to a Vote of Security Holders. MasTec, Inc. (the “ Company ”) held its Annual Meeting on May 21, 2026. The final voting results for each of the proposals submitted to a vote of the Company’s shareholders at the Annual Meeting are as follows: Proposal 1: Election of Ernst N. Csiszar, Julia L. Johnson and Jorge Mas as Class I directors to serve until the 2029 Annual Meeting of Shareholders.        Votes “For”      Votes Withheld      Broker Non-Votes   Ernst N. Csiszar      49,045,086        4,544,750        4,403,928   Julia L. Johnson      46,506,948        7,082,888        4,403,928   Jorge Mas      49,473,243        4,116,593        4,403,928   Proposal 2: Ratification of the appointment of Pricewaterhouse Coopers LLP as the Company’s independent registered public accounting firm for the 2026 fiscal year.   Votes “For”    Votes “Against”    Abstentions    Broker Non-Votes 57,930,704    21,113    41,947    0 Proposal 3: Approval of a non-binding advisory resolution regarding the compensation of the Company’s named executive officers.   Votes “For”    Votes “Against”    Abstentions    Broker Non-Votes 49,678,324    3,820,263    91,249    4,403,928   SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.       MASTEC, INC. Date: May 22, 2026     By:   /s/ Alberto de Cardenas       Alberto de Cardenas       Executive Vice President, General Counsel and Secretary   3