Company: TNRSF
Filing Date: 2025-02-21
Form Type: 6-K
Source: 0001171843-25-000987
Chunk: 105

Company: TENARIS SA
Filing Date: 2025-02-21
Form: 6-K
Chunk 105
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 2023, PwC rendered $242 thousand for tax services
to the recently acquired Mattr’s pipe coating business unit.

| - 69 - |

| Consolidated Financial Statements                                                                           |
| For the years ended 2024, 2023 and 2022 - all amounts in thousands of U.S. dollars, unless otherwise stated |

#### 33Principal subsidiaries
The following is a list of Tenaris’s principal subsidiaries and its
direct and indirect percentage of ownership of each controlled company at December 31, 2024, 2023 and 2022.

| Company                                                              |     | Country of     
 Incorporation  |     | Main activity                                                                          |     | Percentage of ownership 
     at December 31, (*) |     |      |     |      |
|                                                                      |     |                |     |                                                                                        |     |                    2024 |     | 2023 |     | 2022 |
| ALGOMA TUBES INC.                                                    |     | Canada         |     | Manufacturing of welded and seamless steel pipes                                       |     |                    100% |     | 100% |     | 100% |
| BREDERO SHAW INTERNATIONAL B.V. and subsidiaries                     |     | Netherlands    |     | Holding company and supplier of pipe coating services                                  |     |                    100% |     | 100% |     |   NA |
| CONFAB INDUSTRIAL S.A. and subsidiaries                              |     | Brazil         |     | Manufacturing of welded steel pipes                                                    |     |                    100% |     | 100% |     | 100% |
| DALMINE S.p.A. and subsidiaries (a)                                  |     | Italy          |     | Manufacturing of seamless steel pipes                                                  |     |                    100% |     | 100% |     | 100% |
| EXIROS B.V. and subsidiaries (b)                                     |     | Netherlands    |     | Procurement and trading services                                                       |     |                     50% |     |  50% |     |  50% |
| HYDRIL COMPANY                                                       |     | USA            |     | Manufacturing and marketing of premium connections                                     |     |                    100% |     | 100% |     | 100% |
| MAVERICK TUBE CORPORATION and subsidiaries                           |     | USA            |     | Manufacturing of welded and seamless steel pipes                                       |     |                    100% |     | 100% |     |