Company: LGN
Filing Date: 2025-09-02
Form Type: S-1/A
Source: 0001193125-25-193346
Chunk: 25

Company: Legence Corp.
Filing Date: 2025-09-02
Form: S-1/A
Chunk 25
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 no exercise of the underwriters’ option to purchase additional shares prior to the closing of this offering) that we intend to adopt in connection with the completion of this offering for the grants of equity awards to certain of our officers, employees and non-employee directors. See “Compensation Discussion and Analysis” for more information. Unless otherwise indicated, this prospectus reflects:

| • |     | an initial public offering price of $27.00 per share, which is the midpoint of the estimated price range set 
 forth on the cover of this prospectus;                                                                       |

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| • |     | no exercise by the underwriters of their over-allotment option to purchase up to 3,157,808 additional shares of  
 Class A Common Stock from us and 742,192 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 |

| • |     | 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 may materially and adversely affect our business because 
 our business is dependent on levels of construction activity.                                                  |

| • |     | If we do not compete and evolve effectively in our target markets, our operating results could be harmed. |

| • |     | Misconduct and errors by our employees, subcontractors, partners or third-party service providers could harm our 
 business.                                                                                                        |

| • |     | Cost overruns, inflation, delays and other risks could significantly impact our results, particularly with 
 respect to fixed-price contracts.                                                                          |

| • |     | A failure to secure new contracts may adversely affect our cash flows and financial results. |

| • |     | If we fail to complete a project in a timely manner, miss a required performance standard or otherwise