Company: LGN
Filing Date: 2025-09-11
Form Type: 8-A12B
Source: 0001193125-25-201126
Chunk: 0

Company: Legence Corp.
Filing Date: 2025-09-11
Form: 8-A12B
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Legence Corp. (Exact name of registrant as specified in its charter)

| Delaware                                      |     |         33-2905250 |
| (State or other jurisdiction of incorporation 
 or organization)                              |     |   -I.R.S. Employer 
 Identification No. |
| 1601 Las Plumas Avenue                        
 San Jose, California                          |     |              95133 |
| (Address of principal executive offices)      |     |          -Zip Code |

| Securities to be registered pursuant to Section 12(b) of the Act: |

| Title of each class                             
 to be registered                                |     | Name of each exchange on which 
 each class is to be registered |
| Class A common stock, $0.01 par value per share |     | The Nasdaq Stock Market LLC    |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box. ☒ If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box. ☐ If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box. ☐ Securities Act registration statement or Regulation A offering statement file number to which this form relates: 333-289629 Securities to be registered pursuant to Section 12(g) of the Act: None

| Item 1. | Description of Registrant’s Securities to be Registered. |

A description of the Class A common stock, $0.01 par value per share, of Legence Corp., a Delaware corporation (the “Registrant”), to be registered hereunder is contained in the section titled “Description of Capital Stock” in the prospectus forming a part of the Registrant’s Registration Statement on Form S-1(File No. 333-289629)initially filed with the Securities and Exchange Commission (the “Commission”) on August 15, 2025, including exhibits, and as may be subsequently amended from time to time