Comparable stake leader
SAN FAUSTIN S.A.
SEC ownership of TENARIS SA
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001190723.
Disclosed value leader
SAN FAUSTIN S.A.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- TS on NYSE, TNRSF on OTC
- Parsed ownership sources
- 13D/G and 13F
- Largest SEC-reported holder
- SAN FAUSTIN S.A.
- Latest 13D/G holder
- SAN FAUSTIN S.A.
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0001190723
- Issuer location
- Luxembourg, Luxembourg
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of TENARIS SA (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
SAN FAUSTIN S.A.
Disclosed value leader
SAN FAUSTIN S.A.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
Lead comparable stake: 69%
13D/G row: SAN FAUSTIN S.A.
Showing 1-8 of 50 holder rows.
Quick read
SAN FAUSTIN S.A. leads the comparable SEC ownership view at 69%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SAN FAUSTIN S.A.'s linked filing trail.
Comparable ownership
Top 5
SAN FAUSTIN S.A.
69%
FMR LLC
0.82%
Westwood Global Investments, LLC
0.66%
RENAISSANCE TECHNOLOGIES LLC
0.32%
VAN ECK ASSOCIATES CORP
0.29%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SAN FAUSTIN S.A. |
13D/G
|
69%
|
$27,655,736,021
692,085,486 shares
|
-$756,031,252 | 06 Feb 2026 |
| FMR LLC |
13F
Company
|
0.82%
|
$480,087,317
8,251,759 shares
|
— | 31 Mar 2026 |
| Westwood Global Investments, LLC |
13F
Company
|
0.66%
|
$388,276,914
6,673,718 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
0.32%
|
$186,161,106
3,199,744 shares
|
— | 31 Mar 2026 |
| VAN ECK ASSOCIATES CORP |
13F
Company
|
0.29%
|
$168,317,000
2,893,032 shares
|
— | 31 Mar 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
0.24%
|
$139,924,878
2,405,034 shares
|
— | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
Company
|
0.14%
|
$84,083,000
1,445,210 shares
|
— | 31 Mar 2026 |
| MORGAN STANLEY |
13F
Company
|
0.12%
|
$68,540,118
1,178,069 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 09 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Recent insider transactions for TENARIS SA
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.