| SC 13D/A | 2024-01-22 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 61.4% | EDGAR |
| SC 13D/A | 2023-11-03 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13D/A | 2021-06-28 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13D/A | 2020-06-25 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13G/A | 2017-02-08 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 55,471,974 | 4.7% | EDGAR |
| SC 13D/A | 2016-11-14 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13G/A | 2016-04-20 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 81,903,771 | 6.9% | EDGAR |
| SC 13G/A | 2016-04-18 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 81,903,771 | 6.9% | EDGAR |
| SC 13G/A | 2016-03-01 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 79,833,738 | 6.8% | EDGAR |
| SC 13D/A | 2015-11-19 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13G/A | 2015-01-06 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 61,603,926 | 10.4% | EDGAR |
| SC 13G/A | 2014-01-24 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 63,061,097 | 10.7% | EDGAR |
| SC 13G/A | 2013-01-25 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 66,611,901 | 11.3% | EDGAR |
| SC 13G/A | 2012-02-10 | Capital World Investors | TENARIS SA | 31,175,036 | 2.6% | EDGAR |
| SC 13G | 2012-01-11 | ABERDEEN ASSET MANAGEMENT PLC/UK | TENARIS SA | 54,112,167 | 9.2% | EDGAR |
| SC 13D | 2011-02-14 | SAN FAUSTIN S.A. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13G | 2011-02-14 | Capital World Investors | TENARIS SA | 61,487,436 | 5.2% | EDGAR |
| SC 13G/A | 2010-02-11 | San Faustin N.V. | TENARIS SA | 713,605,187 | 60.4% | EDGAR |
| SC 13G/A | 2010-02-11 | Capital World Investors | TENARIS SA | 48,317,436 | 4.1% | EDGAR |
| SC 13G | 2009-02-12 | Capital World Investors | TENARIS SA | 64,633,440 | 5.5% | EDGAR |