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Institutional Ownership

Tenaris S A

CUSIP 88031M109SPONSORED ADSTSQ1 2026

13D / 13G Filings
12
Schedule 13D/13G on record
Beneficial Filers
2
Distinct reporting persons
Largest Stake
69.7%
Max % of class reported
Institutional Holders
260
13F filers (latest quarter)

Beneficial Owners — Schedule 13D / 13G

12 filings · latest Feb 10, 2026

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#FiledReporting PersonForm% of ClassSharesFiling
1Feb 10, 2026Rocca &Amp; Partners Stichting Administratiekantoor Aandelen San Faustin13D/A68.6%—SEC
2Dec 17, 2025Rocca &Amp; Partners Stichting Administratiekantoor Aandelen San Faustin13D/A69.7%—SEC
3Sep 19, 2025Rocca &Amp; Partners Stichting Administratiekantoor Aandelen San Faustin13D/A68.5%—SEC
4Jul 8, 2025Rocca &Amp; Partners Stichting Administratiekantoor Aandelen San Faustin13D/A67.5%—SEC
5Feb 25, 2025Rocca &Amp; Partners Stichting Administratiekantoor Aandelen San Faustin13D/A66.5%—SEC
6Dec 9, 2024San Faustin S.A.13D/A65.5%713.61MSEC
7Jul 30, 2024San Faustin S.A.13D/A64.3%713.61MSEC
8Jun 4, 2024San Faustin S.A.13D/A62.8%713.61MSEC
9Jan 22, 2024San Faustin S.A.13D/A61.4%713.61MSEC
10Nov 3, 2023San Faustin S.A.13D/A60.4%713.61MSEC

2 more beneficial-ownership filings on Premium

See the full Schedule 13D/13G history for Tenaris S A.

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Top Institutional Holders (13F)

Largest reported positions · latest quarter

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#FundSharesValue
1Fmr LLC8.25M$480.09M
2Westwood Global Investments, LLC6.67M$388.28M
3Renaissance Technologies LLC3.20M$186.16M
4Wellington Management Group LLP2.41M$139.92M
5Morgan Stanley1.18M$68.54M
6Invesco Ltd.1.17M$67.98M
7Dimensional Fund Advisors LP1.12M$65.22M
8Driehaus Capital Management LLC888.3K$51.68M
9Goldman Sachs Group Inc720.9K$41.94M
10Blackrock, Inc.715.8K$41.64M