Company: LGN
Filing Date: 2025-08-25
Form Type: S-1/A
Source: 0001193125-25-186788
Chunk: 138

Company: Legence Corp.
Filing Date: 2025-08-25
Form: S-1/A
Chunk 138
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 management believes these measures may be useful for investors in comparing our operating results with those of other companies. Our non-GAAPfinancial measures may not be comparable to similarly titled measures used by other companies, have limitations as analytical tools and should not be considered in isolation, or substitutes for analysis of our operating results as reported under GAAP. Additionally, we do not consider our non-GAAPfinancial measures superior to, or a substitute for, the equivalent measures calculated and presented in accordance with GAAP. Some of the limitations are that such measures: 99

| • |     | may exclude the recurring expenses of depreciation and amortization of property and equipment and definite-lived 
 intangible assets and the assets being depreciated and amortized may have to be replaced in the future;          |

| • |     | do not reflect changes in our working capital needs; |

| • |     | do not reflect the interest (income) expense on our indebtedness; or |

| • |     | do not reflect the income tax (benefit) provision we are required to make. |

In order to evaluate our business, we encourage you to review the financial statements included elsewhere in this prospectus, and not rely on a single financial measure to evaluate our business. The following table provides a reconciliation of our Net Income (Loss), the most directly comparable financial measure presented in accordance with GAAP, to Adjusted EBITDA, and a calculation of Adjusted EBITDA Margin for the periods presented herein (dollars in thousands):

|                                                                   |     | Predecessor 
 2024        | For the Three 
  Months Ended 
      June 30, |   |     | 2025 |        |    |     | 2024 | For the Six Months 
     Ended June 30, |    |     | 2025 |         |    |
|:------------------------------------------------------------------|:----|:------------|--------------:|:--|:----|:-----|-------:|:---|:----|:-----|-------------------:|:---|:----|:-----|--------:|:---|
| Net income (loss)                                                 |     | $           |         6,190 |   |     | $    | (3,869 | )  |     | $    |             (8,767 | )  |     | $    | (23,008 | )  |
| Interest expense                                                  |     |             |        20,818 |   |     |      |