TENARIS S.A.
TENARIS S.A. is a Public Limited Company registered in Luxembourg under B85203, and its current status with Luxembourg Business Register (LBR/RCS) is active. The company was incorporated on 9 January 2002 and lists its registered address as Luxembourg, Luxembourg. 5 shareholders are on record for TENARIS S.A., and since every one of them is a company rather than an individual, this particular filing does not on its own establish an ultimate beneficial owner (UBO) — identifying one would mean tracing the ownership of each shareholding company in turn. This profile is sourced directly from Luxembourg Business Register (LBR/RCS) and was last updated on 22 September 2026.
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Shareholders
5
Shareholders of TENARIS S.A.
Five shareholders are currently on record for TENARIS S.A., held on the RCS filing, filed under Article 12bis of the amended law of 19 December 2002. The largest of these is MFS SERIES TRUST X-MFS International Intrinsic Value Fund, holding 4.5% — the largest recorded stake — followed by MFS SERIES TRUST X-MFS International Growth Fund at 4.1%; the remaining 3 shareholders shown hold smaller stakes. Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Data availability
The register reports 21 shareholders in total, though only the top 5 by holding are shown in this view.
Officers
5
Directors and officers of TENARIS S.A.
The President Of Southern Cone of TENARIS S.A. on record is Javier Martinez Alvarez; 5 officers are shown here, filed with Luxembourg Business Register (LBR/RCS). Management authority at TENARIS S.A. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control. The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Data availability
The register reports 15 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Group Structure
Group structure of TENARIS S.A.
TENARIS S.A. sits 3 levels below its ultimate parent, ROCCA & PARTNERS Stichting Administratiekantoor Aandelen SAN FAUSTIN, registered in Netherlands. 16 subsidiaries are recorded beneath it, across 8 jurisdictions. The full chain up to ROCCA & PARTNERS Stichting Administratiekantoor Aandelen SAN FAUSTIN is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by TENARIS S.A.'s own shareholder record. Each of these downward relationships is derived rather than filed: resolved by matching entities across the registry network, not stated directly in a single document.
- Tenaris Global Services (usa) Corporation (United States)
- TECHNICAL DRILLING & PRODUCTION SERVICES NIGERIA LTD (Nigeria)
- Precision Tube Canada ULC (Canada)
- Tenaris Bay City, Inc. (United States)
- Shawcor Pipe Protection LLC (United States)
- Tenaris Rods (u.s.a.), Inc. (United States)
- Tenaris Global Services (Canada) Inc (Canada)
- Algoma Tubes Inc (Canada)
- Tenaris Guyana Inc (Guyana)
- Maverick Tube Corporation (United States)
Data availability
Those 16 subsidiaries span Luxembourg, United States, Nigeria, Canada, Guyana, Switzerland, and 2 more jurisdictions, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Three of the 16 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
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Frequently Asked Questions
Who owns TENARIS S.A.?
Five shareholders are currently on record for TENARIS S.A., held on the RCS filing, filed under Article 12bis of the amended law of 19 December 2002. The largest of these is MFS SERIES TRUST X-MFS International Intrinsic Value Fund, holding 4.5% — the largest recorded stake — followed by MFS SERIES TRUST X-MFS International Growth Fund at 4.1%; the remaining 3 shareholders shown hold smaller stakes. Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Who is TENARIS S.A.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for TENARIS S.A. is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
How many shareholders does TENARIS S.A. have on record?
5 shareholders are shown on record for TENARIS S.A.. The register reports 21 in total; only the top 5 by holding are shown here.
What is TENARIS S.A.'s company registration number?
TENARIS S.A.'s registration number is B85203, filed with Luxembourg Business Register (LBR/RCS) in Luxembourg. Its current status on the register is active.
Is TENARIS S.A. still an active company?
TENARIS S.A.'s status on Luxembourg Business Register (LBR/RCS) is listed as active.
When was TENARIS S.A. incorporated?
TENARIS S.A. was incorporated on 9 January 2002, according to Luxembourg Business Register (LBR/RCS).
What is TENARIS S.A.'s registered address?
The registered address on file for TENARIS S.A. is Luxembourg, Luxembourg.
What legal structure is TENARIS S.A. registered as?
TENARIS S.A. is registered as a Public Limited Company in Luxembourg.
Who are the officers/directors of TENARIS S.A.?
The President Of Southern Cone of TENARIS S.A. on record is Javier Martinez Alvarez; 5 officers are shown here, filed with Luxembourg Business Register (LBR/RCS). Management authority at TENARIS S.A. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does TENARIS S.A. have a parent company or subsidiaries?
TENARIS S.A. sits 3 levels below its ultimate parent, ROCCA & PARTNERS Stichting Administratiekantoor Aandelen SAN FAUSTIN, registered in Netherlands. 16 subsidiaries are recorded beneath it, across 8 jurisdictions. Those 16 subsidiaries span Luxembourg, United States, Nigeria, Canada, Guyana, Switzerland, and 2 more jurisdictions, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Three of the 16 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
Can Zavia monitor changes to TENARIS S.A.'s ownership over time?
This profile reflects a point-in-time snapshot from Luxembourg Business Register (LBR/RCS). Zavia's monitoring API can track changes to TENARIS S.A.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access TENARIS S.A.'s data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including Luxembourg, so records like TENARIS S.A.'s registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Luxembourg Business Register (LBR/RCS) and was last synced on 22 September 2026.