Company: LGN
Filing Date: 2025-04-30
Form Type: DRS/A
Source: 0000950123-25-003868
Chunk: 228

Company: Legence Corp.
Filing Date: 2025-04-30
Form: DRS/A
Chunk 228
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 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 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).                                                                                                                                                              |

151

Confidential Treatment Requested by Legence Corp.

Pursuant to 17 C.F.R. Section 200.83

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 for a period of 180 days from the date of this prospectus, subject to certain exceptions. The section titled “Underwriting” contains a description of these lock-up agreements.

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 entitled to sell those shares, subject only to the availability of current public information about us. A nonaffiliated person who has beneficially owned restricted securities within the meaning of Rule 144 for at
least one year would be entitled to sell those shares without regard to the provisions of Rule 144.

A person (or persons whose shares
are aggregated) who is deemed to be an affiliate of ours and who has beneficially owned restricted securities within the