SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA
SIDENOR ACEROS ESPECIALES, S.L.U. is a private limited company (sociedad limitada unipersonal) registered in Spain under CIF/registration number B01292903, recorded in the Mercantile Registry of Bizkaia. Incorporated in 1999, the company is recorded as active and has its registered address on Calle Ugarte, s/n, in Basauri, Bizkaia, in Spain’s Basque Country.
The company manufactures special long steel and calibrated steel products, classified under CNAE 2410 (manufacture of basic iron, steel and ferro-alloy products). It supplies customers in the automotive, machinery, capital-goods, shipbuilding, civil-engineering, defense, energy, mining, rail and petrochemical sectors. SIDENOR ACEROS ESPECIALES, S.L.U. is the principal operating company of the Sidenor steel group, which produces from plants in the Basque Country, Cantabria and Catalonia with a combined production capacity exceeding 900,000 tonnes per year, and maintains commercial offices in Germany, France, Italy and the United Kingdom.
The current Sidenor business was formed in July 2016, when Brazil’s Gerdau S.A. sold its Spanish steel operations to Clerbil, Sociedad Limitada, an investment vehicle led by former Gerdau Espana chief executive Jose Antonio Jainaga, for a reported EUR 155 million. According to commercial-registry filing data reported by Spanish business-information providers, SIDENOR ACEROS ESPECIALES, S.L.U. recorded company-level sales of approximately EUR 787.5 million in the 2024 financial year. The shares of SIDENOR ACEROS ESPECIALES, S.L.U. are not admitted to trading on any stock exchange.
- Company fundamentals
- Corporate linkage & group structures
- Digitized company financials
- Firmographics — websites, social profiles, revenue and employee estimates
Shareholders
Shareholders of SIDENOR ACEROS ESPECIALES, S.L.U.
SIDENOR ACEROS ESPECIALES, S.L.U. is registered as a sociedad limitada unipersonal (single-member limited company), meaning Spanish company law records it as having one shareholder. No public filing consulted in this review discloses that shareholder’s identity or an ownership percentage. Spain does not generally require private limited companies (S.L.) to publish a full shareholder register (libro registro de socios) as part of the standard Mercantile Registry company extract, and the separate Registro de Titularidades Reales beneficial-ownership register is not openly searchable. As of September 2026, the entity’s on-file governance points to Sidenor Holdings Europa, S.A. as the recorded sole administrator, which may suggest a corporate ownership link, but this reflects administrator (governance) data rather than a confirmed shareholder filing and should not be treated as verified shareholder information.
Data availability
Shareholder disclosure for SIDENOR ACEROS ESPECIALES, S.L.U. is categorised as Not public: single-member status is a matter of registry record, but the identity of that member is not confirmed through a publicly accessible ownership filing reviewed for this profile.
Sources
Colegio de Registradores / Registro Mercantil Central, registradores.org (registry data, retrieved 15 September 2026).
Officers
1
Directors and officers of SIDENOR ACEROS ESPECIALES, S.L.U.
Registry data sourced from the Colegio de Registradores / Registro Mercantil Central and last verified for this profile on 15 September 2026 records a single active governance appointment for SIDENOR ACEROS ESPECIALES, S.L.U.: a sole administrator (Administrador Unico) structure, with the position held by the corporate entity Sidenor Holdings Europa, S.A. (Spain), rather than by a named natural person. No former or resigned officers appear in the data reviewed. Because the sole administrator is itself a company, its own individual directors are not identified in this block.
Separately, Spanish and industry press report that Jose Antonio Jainaga has served as president of the wider Sidenor steel business since 2016, after leading the investor group (Clerbil, Sociedad Limitada) that acquired it from Gerdau, and is reported to have become chairman of Talgo, S.A. in January 2026. This reflects his reported role in the Sidenor group’s leadership and ownership rather than a confirmed personal directorship of record at the SIDENOR ACEROS ESPECIALES, S.L.U. legal-entity level.
Data availability
Officer information for this Spanish sociedad limitada is Partial: the Mercantile Registry filing identifies the corporate sole administrator but does not disclose the natural persons who represent it, and nationality or residence data is not published for this entity type.
Sources
Colegio de Registradores / Registro Mercantil Central, registradores.org (retrieved 15 September 2026); Noticias de Alava, “Jainaga, el industrial que aspira a liderar los cambios en el sector vasco”, noticiasdealava.eus (9 August 2026); OKDiario, “Talgo nombra a Jose Antonio Jainaga… como nuevo presidente”, okdiario.com (retrieved 16 September 2026).
Group Structure
Group structure of SIDENOR ACEROS ESPECIALES, S.L.U.
SIDENOR ACEROS ESPECIALES, S.L.U. is not an independent company. Mercantile Registry-derived corporate-linkage data reviewed for this profile (as of 15 September 2026) records its immediate parent as Sidenor Holdings Europa, S.A. (Spain, registration number A79925749), which in turn sits beneath Clerbil, Sociedad Limitada (Spain, registration number B95839361) as the recorded top holding company of this branch of the structure. This is consistent with reporting that Clerbil, an investment vehicle led by Jose Antonio Jainaga, acquired the former Gerdau Spanish steel business in July 2016 for a reported EUR 155 million and continued operating it under the Sidenor brand. Ownership percentages within this chain are not disclosed in the sources reviewed. The same registry data records several Sidenor-branded direct subsidiaries beneath SIDENOR ACEROS ESPECIALES, S.L.U., consistent with the group’s reported international sales offices.
Verified corporate relationships
| Entity | Country | Registration number | Relationship | Ownership | Status | Information date |
|---|---|---|---|---|---|---|
| Sidenor Holdings Europa, S.A. | Spain | A79925749 | Immediate parent | Not disclosed | Active | 15 Sep 2026 |
| Clerbil, Sociedad Limitada | Spain | B95839361 | Ultimate parent (recorded) | Not disclosed | Active | 15 Sep 2026 |
| Sidenor Investigacion y Desarrollo, S.A. | Spain | A48298780 | Direct subsidiary (recorded) | Not disclosed | Active | 15 Sep 2026 |
| Sidenor Bright Steels, S.L.U. | Spain | B01240878 | Direct subsidiary (recorded) | Not disclosed | Active | 15 Sep 2026 |
| Sidenor UK Limited | United Kingdom | 01236815 | Direct subsidiary (recorded) | Not disclosed | Active | 15 Sep 2026 |
| Sidenor (Deutschland) GmbH | Germany | 40227B18610 | Direct subsidiary (recorded) | Not disclosed | Active | 15 Sep 2026 |
| Sidenor France | France | 30368032600079 | Direct subsidiary (recorded) | Not disclosed | Active | 15 Sep 2026 |
Recent structural changes
In July 2016, Clerbil, Sociedad Limitada acquired the Spanish steel operations now organised under SIDENOR ACEROS ESPECIALES, S.L.U. from Brazil’s Gerdau S.A. for a reported EUR 155 million, with up to a further EUR 45 million in contingent payments depending on business performance; the transaction returned the business to the Sidenor brand under Basque ownership.
Data availability
Corporate-linkage information for this structure is Partial: the parent and several subsidiary entities are recorded with registration numbers, but ownership and voting percentages are not disclosed in the sources reviewed, and the wider Clerbil holding also records other, apparently unrelated investments outside the steel business that are not addressed in this block.
Sources
Colegio de Registradores / Registro Mercantil Central, registradores.org (corporate-linkage data, retrieved 15 September 2026); Norgestion / Expansion, “La brasilena Gerdau vende Sidenor a Clerbil por 155 millones”, norgestion.com (retrieved 16 September 2026).
CLERBIL SOCIEDAD LIMITADA.
Spain
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Frequently Asked Questions
What does SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA do?
SIDENOR ACEROS ESPECIALES, S.L.U. (registration number B01292903) is a private limited company registered in the Mercantile Registry of Bizkaia, Spain, incorporated in 1999 and based in Basauri; it manufactures special long steel and calibrated steel products (CNAE 2410) for the automotive, machinery, capital-goods, shipbuilding, civil-engineering, defense, energy, mining, rail and petrochemical industries, and is the principal operating company of the Sidenor steel group, which reports production capacity exceeding 900,000 tonnes per year across plants in the Basque Country, Cantabria and Catalonia.
Who owns SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA?
SIDENOR ACEROS ESPECIALES, S.L.U. is registered as a sociedad limitada unipersonal (single-member company), but no public filing consulted identifies its sole shareholder or an ownership percentage; Spain does not generally publish the full shareholder register of private S.L. companies, so shareholder disclosure here is categorised as Not public.
Who is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's UBO (Ultimate Beneficial Owner)?
No Ultimate Beneficial Owner (UBO) data is recorded for SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.
What is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's company registration number?
SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's registration number is B01292903, filed with Colegio de Registradores / Registro Mercantil Central in Spain. Its current status on the register is active.
Is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA still an active company?
SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's status on Colegio de Registradores / Registro Mercantil Central is listed as active.
When was SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA incorporated?
SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA was incorporated on 1 January 1999, according to Colegio de Registradores / Registro Mercantil Central.
What is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's registered address?
The registered address on file for SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA is BASAURI, Spain.
What legal structure is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA registered as?
SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA is registered as a Private limited company (Ltd.) in Spain.
What is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's revenue?
Spanish commercial-registry filing data reported by business-information providers shows SIDENOR ACEROS ESPECIALES, S.L.U. recorded company-level sales of approximately EUR 787.5 million in the 2024 financial year, down from the prior year; this figure has not been independently cross-checked against the filed annual accounts themselves.
Is SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA listed on a stock exchange?
SIDENOR ACEROS ESPECIALES, S.L.U. shares are not admitted to trading on any stock exchange; a CNMV ISIN registry search under its CIF (B01292903) returned no active or historic listed security.
Who are the officers/directors of SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA?
Registro Mercantil data retrieved 15 September 2026 records the governance of SIDENOR ACEROS ESPECIALES, S.L.U. as a sole administrator (Administrador Unico) held by the corporate entity Sidenor Holdings Europa, S.A., rather than by a named natural person; Jose Antonio Jainaga is separately reported in the press as president of the wider Sidenor group since 2016, but this is not confirmed as a personal directorship of record at this specific legal entity.
Does SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA have a parent company or subsidiaries?
SIDENOR ACEROS ESPECIALES, S.L.U. is recorded as part of the Sidenor steel group, with Sidenor Holdings Europa, S.A. (Spain, A79925749) as its immediate parent and Clerbil, Sociedad Limitada (Spain, B95839361) as the recorded ultimate holding company; Clerbil, led by Jose Antonio Jainaga, acquired the business from Brazil Gerdau S.A. in July 2016 for a reported EUR 155 million. Ownership percentages within the chain are not disclosed.
Can Zavia monitor changes to SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's ownership over time?
This profile reflects a point-in-time snapshot from Colegio de Registradores / Registro Mercantil Central. Zavia's monitoring API can track changes to SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including Spain, so records like SIDENOR ACEROS ESPECIALES SOCIEDAD LIMITADA'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 Colegio de Registradores / Registro Mercantil Central and was last synced on 15 September 2026.