Company: MTZ
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042499
Chunk: 38

Company: MASTEC INC
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 38
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 on the applicable market exchange rate (Section 1405). Unless otherwise provided in the applicable prospectus supplement, a “conversion event” means the cessation of use of:

| • |     | a currency (other than a European Currency Unit or other currency unit) issued by the government of one or more                                                                                                                                 
 countries other than the United States, both by the government of the country that issued that currency and for the settlement of transactions by a central bank or other public institutions of or within the international banking community; |

| • |     | the European Currency Unit, both within the European Monetary System and, for the settlement of transactions, by 
 public institutions of or within the European Communities (Section 101); or                                      |

| • |     | any currency other than the European Currency Unit for the purposes for which it was established. |

Unless otherwise provided in the applicable prospectus supplement, we will make all payments of principal of, and any premium, make-whole amount, interest and additional amounts on, any debt security that is payable in a foreign currency that ceases to be used by its government of issuance in United States dollars. 27

In the event that we effect covenant defeasance with respect to any debt securities and the debt securities are declared due and payable because of the occurrence of an event of default other than:

| • |     | the event of default described in the fourth bullet under “-Events of Default, Notice and Waiver,” 
 which would no longer be applicable to the debt securities of that series (Section 1005); or       |

| • |     | the event of default described in the eighth bullet under “-Events of Default, Notice and Waiver” with 
 respect to a covenant as to which there has been covenant defeasance,                                  |

then the amount on deposit with the trustee will still be sufficient to pay amounts due on the debt securities at the time of their stated maturity but may not be sufficient to pay amounts due on the debt securities at the time of the acceleration resulting from the event of default. In this case, we would remain liable to make payment of the amounts due at the time of acceleration. The applicable prospectus supplement may describe any additional provisions permitting defeasance or covenant defeasance, including any modifications to the provisions described above, with respect to a particular series of debt securities. Conversion and Exchange Rights The terms on which debt securities of any series may be convertible into or exchangeable for our common stock, preferred stock or other securities or property of us will be