Company: MTZ
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042499
Chunk: 5

Company: MASTEC INC
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 5
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 by, any of our forward-looking statements. These and other risks are detailed in this prospectus, in the documents that we incorporate by reference into this prospectus and in other documents that we file with the SEC. We do not undertake any obligation to publicly update or revise these forward-looking statements after the date of this prospectus to reflect future events or circumstances, except as required by applicable law. We qualify any and all of our forward-looking statements by these cautionary factors. You should carefully consider the risks and uncertainties that affect our business in the “Risk Factors” section of this prospectus and in our Annual Reports on Form 10-K,Quarterly Reports on Form 10-Qand other documents filed by us from time to time with the SEC. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. The issues and associated risks and uncertainties discussed in “Risk Factors” herein and in the reports that we incorporate herein by reference are not the only ones we may face. Additional issues may arise or become material as our business evolves. The risks and uncertainties associated with those additional issues could impair our business in the future. 2

RISK FACTORS

Investing in our securities involves risks. Before deciding to purchase any of our securities, you should carefully consider the discussion of risks and
uncertainties under the heading “Risk Factors” contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which is incorporated by reference in this prospectus, and
under similar headings in our subsequently filed quarterly reports on Form 10-Q and annual reports on Form 10-K, as well as the other risks and uncertainties described
in any applicable prospectus supplement or free writing prospectus and in the other documents incorporated by reference in this prospectus. See the section entitled “Where You Can Find More Information” in this prospectus. The risks and
uncertainties we discuss in the documents incorporated by reference in this prospectus are those we currently believe may materially affect our company. Additional risks and uncertainties not presently known to us or that we currently believe are
immaterial also may materially and adversely affect our business, financial condition and results of operations.

3

OUR COMPANY

This summary highlights selected information and does not contain all the information that is important to you. You should carefully read this prospectus, any
applicable prospectus supplement and the documents to which we have referred in “Incorporation