Company: LGN
Filing Date: 2025-08-15
Form Type: S-1
Source: 0001193125-25-181698
Chunk: 349

Company: Legence Corp.
Filing Date: 2025-08-15
Form: S-1
Chunk 349
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 430B or other than prospectuses filed in reliance on Rule 430A, shall be deemed to be part of and included in the 
 registration statement as of the date it is first used after effectiveness. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or          
 deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such first use, supersede or modify any statement that was     
 made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such date of first use.                                                                                    |

II-4

| (4) | That, for the purpose of determining liability under the Securities Act to any purchaser in the initial                                                                                                                                              
 distribution of the securities, in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are 
 offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:                           |

| (i) | Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be 
 filed pursuant to Rule 424;                                                                                    |

| (ii) | Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or 
 used or referred to by the undersigned registrant;                                                             |

| (iii) | The portion of any other free writing prospectus relating to the offering containing material information about 
 the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and        |

| (iv) | Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser. |

II-5

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Jose, State of California, on August 15, 2025.

| By: |     | /s/ Jeffrey Sprau                    |
|     |     | Jeffrey Sprau                        |
|     |     | Chief Executive Officer and