Company: LGN
Filing Date: 2025-09-15
Form Type: S-8
Source: 0001193125-25-203809
Chunk: 0

Company: Legence Corp.
Filing Date: 2025-09-15
Form: S-8
Chunk 0
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As Filed with the Securities and Exchange Commission on September 15, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 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, CA                             |     |     95133 |
| (Address of Principal Executive Offices) |     | -Zip Code |

Legence Corp. 2025 Omnibus Incentive Plan (Full title of the plan) Jeffrey Sprau Chief Executive Officer 1601 Las Plumas Avenue San Jose, CA 95133 (Name and address of agent for service) (833) 534-3623 (Telephone number, including area code, of agent for service) With copies to: Matthew R. Pacey, P.C. Michael W. Rigdon, P.C. Billy Vranish Kirkland & Ellis LLP 609 Main Street, Suite 4700 Houston, Texas 77002 (713) 836-3600 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☐ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☒ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

PART I INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS The information specified in Item 1 and Item 2 of Part I of Form S