MASTEC INC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No. )

Check the appropriate box:

MASTEC, INC.

(Name of Registrant as Specified in Its Charter)

N/A

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

NOTICE OF 2026 ANNUAL MEETING OF SHAREHOLDERS

To our shareholders:

The 2026 Annual Meeting of Shareholders of MasTec, Inc. will be held on May 21, 2026, at 9:30 a.m. EDT, via remote communication as more fully described below.

At the Annual Meeting, shareholders will be asked to vote on the following proposals:

The foregoing proposals are discussed more fully in the Proxy Statement accompanying this notice. Shareholders of record at the close of business on March 13, 2026, are entitled to notice of and to vote at the Annual Meeting and at any adjournments or postponements of the Annual Meeting.

Pursuant to the rules and regulations promulgated by the Securities and Exchange Commission, which we refer to as the SEC, we are providing access to our proxy materials over the Internet. Accordingly, we are sending a Notice of Internet Availability of Proxy Materials on or about April 9, 2026, to our shareholders of record on March 13, 2026. The Notice of Internet Availability of Proxy Materials contains instructions for accessing our Proxy Statement and Annual Report and how to vote. In addition, the Notice of Internet Availability of Proxy Materials contains instructions on how you may (i) receive a paper copy of the Proxy Statement and Annual Report or (ii) elect to receive your Proxy Statement and Annual Report over the Internet.

This year’s Annual Meeting will be held solely by remote communication, in a “virtual only” format, on May 21, 2026, at 9:30 a.m. EDT. The Annual Meeting will not be held at a physical location, and you will not be able to attend the Annual Meeting physically. This does not represent a change in our shareholder engagement philosophy. You are entitled to participate in the Annual Meeting if you were a shareholder as of the close of business on March 13, 2026, the record date (the “Record Date”), or hold a legal proxy for the meeting provided by your bank, broker, or nominee. In order to attend the virtual Annual Meeting, shareholders of record as of the close of business on March 13, 2026, must register via the internet at www.virtualshareholdermeeting.com/MTZ2026. Once registered, shareholders can attend and vote at the virtual Annual Meeting via the internet. You may vote during the virtual Annual Meeting by following the instructions available on the meeting website. If you encounter any difficulties accessing the virtual meeting, follow instructions provided on www.virtualshareholdermeeting.com/MTZ2026. A list of shareholders of record as of the Record Date will be available for inspection by shareholders during the Annual Meeting on the Annual Meeting website. Requests to access the list during the 10 days prior to the date of the Annual Meeting should be directed to the Corporate Secretary at Secretary@MasTec.com. It is important that you read the Proxy Materials, including the Company’s Notice of 2026 Annual Meeting of Shareholders, Proxy Statement, Proxy Card and Annual Report on Form 10-K (collectively, the “Proxy Materials”), and we encourage you to vote your shares of common stock in advance of the Annual Meeting by one of the methods described in the Proxy Materials.

PROXY STATEMENT

This proxy statement describes important issues affecting MasTec, Inc. (“MasTec” or the “Company”) and is furnished in connection with the solicitation of proxies by our Board of Directors (the “Board”) for use at our 2026 Annual Meeting of Shareholders to be held at the time and place set forth in the accompanying notice.