Company: LGN
Filing Date: 2025-08-25
Form Type: S-1/A
Source: 0001193125-25-186788
Chunk: 26

Company: Legence Corp.
Filing Date: 2025-08-25
Form: S-1/A
Chunk 26
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 to purchase within 30 days from              
 the date of this prospectus, at the initial public offering price, to certain of our directors and officers and certain other parties related to us, under the directed share program. The number of shares of our Class A Common Stock available    
 for sale to the general public will be reduced to the extent these individuals purchase such reserved shares. Any reserved shares that are not so purchased will be offered by the underwriters to the general public on the same basis as the other 
 shares offered by this prospectus. See “Underwriting (Conflicts of Interest)—Directed Share Program.”                                                                                                                                                |

| Listing and trading symbol | We intend to list our Class A Common Stock on the Nasdaq under the symbol “LGN.” |

The information above excludes shares of Class A Common Stock reserved for issuance under our omnibus incentive plan that we intend to adopt in connection with the completion of this offering or the grants of equity awards to certain of our officers and employees upon consummation of this offering. See “Compensation Discussion and Analysis” for more information. Unless otherwise indicated, this prospectus reflects:

| • |     | an initial public offering price of $   per share, which is the midpoint of the estimated price range 
 set forth on the cover of this prospectus;                                                            |

| • |     | no exercise by the underwriters of their over-allotment option to purchase up to     additional                        
 shares of Class A Common Stock from us and     additional shares of Class A Common Stock from the selling stockholder; |

| • |     | the consummation of the Corporate Reorganization in connection with the consummation of this offering; and |

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| • |     | the filing of our amended and restated certificate of incorporation and the adoption of our amended and restated 
 bylaws, each in connection with the closing of this offering.                                                    |

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Summary of Risk Factors An investment in our securities involves a high degree of risk. The occurrence of one or more of the events or circumstances described in the section titled “Risk Factors,” alone or in combination with other events or circumstances, may materially adversely affect our business, financial condition and operating results. In that event, the trading price of our securities could decline, and you could lose all or part of your investment. Such risks include, but are not limited to: Risks Related to Business

| • |     | Economic downturns in the markets in which we operate