Company: LGN
Filing Date: 2025-08-25
Form Type: S-1/A
Source: 0001193125-25-186788
Chunk: 106

Company: Legence Corp.
Filing Date: 2025-08-25
Form: S-1/A
Chunk 106
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 range set forth on the cover page of this prospectus), assuming that all holders of 69

LGN Units exchanged their LGN Units for newly issued shares of our Class A Common Stock, calculated before deduction of estimated underwriting discounts and commissions and estimated offering expenses payable by us:

|                                |     | Shares Acquired 
 Number          |     | Percent |     | Total Consideration 
 Amount              
 (in thousands)      |   |     | Percent |      |     | Average Price 
 Per Share     |   |
|:-------------------------------|:----|:----------------|:----|:--------|:----|:--------------------|:--|:----|:--------|:-----|:----|:--------------|:--|
| Existing stockholders          |     |                 |     | %       |     | $                   |   |     |         | %    |     | $             |   |
| New investors in this offering |     |                 |     | %       |     | $                   |   |     |         | %    |     | $             |   |
| Total                          |     |                 |     | 100%    |     |                     | $ |     |         | 100% |     |               | $ |

The above tables and discussion are based on the number of shares of our Class A Common Stock and Class B Common Stock to be outstanding as of the closing of this offering. If the underwriters’ option to purchase additional shares is exercised in full, the number of shares held by new investors will be increased to , or approximately % of the total number of shares of Class A Common Stock. 70

UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL INFORMATION The unaudited pro forma condensed consolidated balance sheet as of June 30, 2025, and the unaudited pro forma condensed consolidated statement of operations for the six months ended June 30, 2025 and the year ended December 31, 2024, present our consolidated financial position and results of operations after giving effect to the following transactions (collectively, the “Transactions”):

| • |     | the Corporate Reorganization, as described and defined under “Corporate Reorganization”; and |

| • |     | the sale by us of shares of Class A Common Stock pursuant to this offering and the application of the                                                                                                                   
 proceeds from this offering as described in “Use of Proceeds,” based on the initial public offering price of $    per share