Tenaris SA
TS- Exchange
- NYSE
- Industry
- Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens)
- SEC CIK
- 0001190723
No open-market purchases or sales by Tenaris SA insiders were filed in the last 90 days; 285 institutions reported holding it in 13F filings for Q2 2026, worth $2.13B in total; no superinvestor holds it.
Other share classesTNRSF
Holders of 5% or more of TS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Tenaris SA, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| San Faustin S.A. | 13D/A | 68.60%692.1M shares | −1.10 ppfrom 69.70% | Feb 25, 20255 filings | Feb 10, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Tenaris SA, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 10, 20261:39 PM ET | San Faustin S.A.and 2 others | 13D/A | 68.60%692.1M shares | −1.10 ppfrom 69.70% | Feb 6, 2026 | SEC |
| Dec 17, 20254:01 PM ET | San Faustin S.A.and 2 others | 13D/A | 69.70%711.0M shares | +1.20 ppfrom 68.50% | Dec 12, 2025 | SEC |
| Sep 19, 20254:01 PM ET | San Faustin S.A.and 2 others | 13D/A | 68.50%713.6M shares | +1.00 ppfrom 67.50% | Sep 17, 2025 | SEC |
| Jul 8, 20258:38 AM ET | San Faustin S.A.and 2 others | 13D/A | 67.50%713.6M shares | +1.00 ppfrom 66.50% | Jul 7, 2025 | SEC |
| Feb 25, 20252:05 PM ET | San Faustin S.A.and 2 others | 13D/A | 66.50%713.6M shares | – | Feb 24, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Tenaris SA shares.
No Form 144 notices for Tenaris SA are on file.