Company: LGN
Filing Date: 2025-09-11
Form Type: 8-A12B
Source: 0001193125-25-201126
Chunk: 1

Company: Legence Corp.
Filing Date: 2025-09-11
Form: 8-A12B
Chunk 1
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 (the “Registration Statement”), is incorporated herein by reference. Any form of prospectus subsequently filed by the Registrant with the Commission pursuant to Rule 424(b) under the Securities Act of 1933, as amended, that constitutes part of the Registration Statement shall be deemed to be incorporated herein by reference.

| Item 2. | Exhibits. |

Under the Instructions as to Exhibits for Form 8-A,no exhibits are required to be filed herewith because no other securities of the Registrant are registered on The Nasdaq Stock Market LLC and the securities registered hereby are not being registered pursuant to Section 12(g) of the Securities Exchange Act of 1934, as amended.

SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

| Dated: September 11, 2025 |     | Legence Corp. |     |                         |
|:--------------------------|:----|:--------------|:----|:------------------------|
|                           |     | By:           |     | /s/ Stephen Butz        |
|                           |     | Name:         |     | Stephen Butz            |
|                           |     | Title:        |     | Chief Financial Officer |