Company: MTZ
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042499
Chunk: 34

Company: MASTEC INC
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 34
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 the debt securities of any series in any material 
 respect;                                                                                                                                                                                                                                                 |

24

| • |     | to add, change or eliminate any provisions of the indenture, provided that any addition, change or elimination                                                                                                                                   
 shall neither apply to any debt security of any series created prior to the execution of such supplemental indenture and entitled to the benefit of such provision nor modify the rights of the holder of any debt security with respect to such 
 provision or become effective only when there are no outstanding debt securities;                                                                                                                                                                |

| • |     | to secure previously unsecured debt securities; |

| • |     | to establish the form or terms of debt securities of any series, including the provisions and procedures, if                                                                                                                                            
 applicable, for the conversion or exchange of the debt securities into our common stock, preferred stock or other securities or property or the addition or modification of any provisions of the indenture as necessary or desirable to provide for or 
 facilitate the guarantee of such securities by one or more guarantors;                                                                                                                                                                                  |

| • |     | to evidence and provide for the acceptance or appointment of a successor trustee or facilitate the administration 
 of the trusts under the indenture by more than one trustee;                                                       |

| • |     | to make any provision for the subordination of the debt securities of a series or with respect to the conversion 
 or exchange of rights of holders pursuant to the requirements of the indenture;                                  |

| • |     | to cure any ambiguity, defect or inconsistency in the indenture, or to make any other provisions with respect to                                                                                                                                          
 matters or questions arising under the indenture which shall not be inconsistent with the provisions of the indenture or to make any other changes, provided that the action does not adversely affect the interests of holders of debt securities of any 
 series issued under the indenture in any material respect;                                                                                                                                                                                                |

| • |     | to close the indenture with respect to the authentication and delivery of additional series of debt securities or 
 to qualify, or maintain qualification of, the indenture under the Trust Indenture Act; or                         |

| • |     | to supplement any of the provisions of the indenture to the extent necessary to permit or facilitate defeasance                                                                                              
 and discharge of any series of debt securities, provided that the action shall not adversely affect the interests of the holders of the debt securities of any series in any material respect (Section 901). |

Modification With Consent of Holders Together with the trustee, we may, when authorized by our board