Company: LGN
Filing Date: 2025-08-15
Form Type: S-1
Source: 0001193125-25-181698
Chunk: 235

Company: Legence Corp.
Filing Date: 2025-08-15
Form: S-1
Chunk 235
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 full and after giving effect to the application of the net proceeds therefrom), all of which will be exchangeable for shares of our Class A Common Stock, and shares of Class A Common Stock. “Certain Relationships and Related Party Transactions—Legence Holdings LLC Agreement” contains additional information. The shares of Class A Common Stock we issue upon such exchanges would be “restricted securities” as defined in Rule 144 described below. However, upon the closing of this offering, we intend to enter into a registration rights agreement with certain of the Existing Owners that will require us to register under the Securities Act shares of Class A Common Stock owned by the Existing Owners. “Certain Relationships and Related Party Transactions—Registration Rights Agreement” contains additional information. As a result of the lock-upagreements described below and the provisions of Rule 144 and Rule 701 under the Securities Act, the shares of our Class A Common Stock (excluding the shares to be sold in this offering) that will be available for sale in the public market are as follows:

| • |     | no shares will be eligible for sale on the date of this prospectus or prior to 180 days after the date of this 
 prospectus; and                                                                                                |

| • |     | shares will be eligible for sale upon the expiration of the lock-up agreements beginning 180 days after the date of this prospectus and when permitted under Rule 144 or Rule 701, or otherwise |

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| pursuant to an effective registration statement (such number of shares includes the Class A Common Stock that may be issued upon exchange of all or a portion of the LGN Units). |

Lock-upAgreements We, the Existing Owners and all of our directors and executive officers will agree not to sell any Class A Common Stock or securities convertible into or exchangeable for shares of Class A Common Stock (including any shares purchased by any of our directors or executive officers pursuant to the directed share program) for a period of 180 days from the date of this prospectus, subject to certain exceptions. The section titled “Underwriting (Conflicts of Interest)” contains a description of these lock-upagreements. Rule 144 In general, under Rule 144 as currently in effect, a person (or persons whose shares are aggregated) who is not deemed to have been an affiliate of ours at any time during the three months preceding a sale, and who has beneficially owned restricted securities within the meaning of Rule 144 for at least six months (including any period of consecutive ownership of preceding nonaffiliated holders) would be