Company: LGN
Filing Date: 2025-12-09
Form Type: S-1
Source: 0001193125-25-312729
Chunk: 2

Company: Legence Corp.
Filing Date: 2025-12-09
Form: S-1
Chunk 2
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 from the sale of shares in this offering by the selling stockholders. Prior to the consummation of this offering, one of the selling stockholders will exchange LGN Units for shares of our Class A Common Stock to be sold by it in the offering. See “Principal and Selling Stockholders” and “Certain Relationships and Related Party Transactions—Exchange Agreement.” Our Class A Common Stock is listed on The Nasdaq Stock Market LLC (“Nasdaq”) under the symbol “LGN.” On December 8, 2025, the last reported sale price of our Class A Common Stock on the Nasdaq was $47.50 per share. Investing in our Class A Common Stock involves risks, including those described under “ Risk Factors” beginning on page 18 of this prospectus.

|                                                        |     | Per share |     | Total |
|:-------------------------------------------------------|:----|:----------|:----|:------|
| Price to the public                                    |     | $         |     | $     |
| Underwriting discounts and                             
 commissions(1)                                         |     | $         |     | $     |
| Proceeds to the selling stockholders (before expenses) |     | $         |     | $     |

| (1) | We refer you to “Underwriting (Conflicts of Interest)” beginning on                         
 page 159 of this prospectus for additional information regarding underwriting compensation. |

The selling stockholders (as defined below) have granted the underwriters the option for a period of 30 days after the date of this prospectus to purchase up to 1,050,000 additional shares of Class A Common Stock on the same terms and conditions set forth above. Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense. The underwriters expect to deliver the shares on or about , 2025. Joint Lead Book-Running Managers

| Goldman Sachs & Co. LLC |     | Jefferies |

Co-Manager Blackstone Capital Markets Prospectus dated , 2025.

TABLE OF CONTENTS

| Commonly Used Defined Terms                                                |     |  ii |
| Presentation of Financial and Operating Data                               |     |   v |
| Industry and Market Data                                                   |     |   v |
| Trademarks and Trade Names                                                 |     |   v |
| Prospectus Summary                                                         |     |   1 |
|