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mtz-20260226FALSE000001561500000156152026-02-262026-02-26

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): February 26, 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 ValueMTZNew 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 2.02 Results of Operations and Financial Condition. The information contained in Item 7.01 of this Current Report on Form 8-K is incorporated by reference in this Item 2.02. ITEM 7.01 Regulation FD Disclosure. On February 26, 2026, MasTec, Inc., a Florida corporation (the “Company”), announced its financial results for the quarter and year ended December 31, 2025. In addition, the Company issued guidance for the quarter ending March 31, 2026 and year ending December 31, 2026, in each case as set forth in the earnings press release. A copy of the Company’s earnings press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference in this Item 7.01. The information contained in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” with the Securities and Exchange Commission nor incorporated by reference in any registration statement filed by the Company under the Securities Act of 1933, as amended. ITEM 9.01 Financial Statements and Exhibits.

(d) Exhibits ExhibitNumber Description

99.1Press Release, February 26, 2026

104The cover page of MasTec, Inc.’s Current Report on Form 8-K, formatted in Inline XBRL (included with the Exhibit 101 attachments).

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:February 26, 2026 By: /s/ Alberto de Cardenas Name: Alberto de Cardenas Title: Executive Vice President, General Counsel and Secretary

mtz-20251030FALSE000001561500000156152025-10-302025-10-30

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): October 30, 2025

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 ValueMTZNew 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 2.02 Results of Operations and Financial Condition. The information contained in Item 7.01 of this Current Report on Form 8-K is incorporated by reference in this Item 2.02. ITEM 7.01 Regulation FD Disclosure. On October 30, 2025, MasTec, Inc., a Florida corporation (the “Company”), announced its financial results for the nine months and quarter ended September 30, 2025. In addition, the Company issued guidance for the quarter and year ending December 31, 2025, in each case as set forth in the earnings press release. A copy of the Company’s earnings press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference in this Item 7.01. The information contained in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” with the Securities and Exchange Commission nor incorporated by reference in any registration statement filed by the Company under the Securities Act of 1933, as amended. ITEM 9.01 Financial Statements and Exhibits.

(d) Exhibits ExhibitNumber Description

99.1Press Release, October 30, 2025

104The cover page of MasTec, Inc.’s Current Report on Form 8-K, formatted in Inline XBRL (included with the Exhibit 101 attachments).

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:October 30, 2025 By: /s/ Alberto de Cardenas Name: Alberto de Cardenas Title: Executive Vice President, General Counsel and Secretary