Joseba Antxón Alonso Egurrola has shifted from being a relatively obscure entrepreneur known mostly within select business and political circles in northern Spain to emerging as a central figure in two prominent investigations: the Koldo case, which focuses on alleged kickbacks tied to public works contracts, and the National Court’s inquiry into the network involving Leire Díez, Vicente Fernández, and the group known as Hirurok.
At the core of the accusations lies Servinabar 2000, a company overseen and owned by Alonso, which investigators suspect has been instrumental in a network tying together business stakeholders, political go-betweens, and individuals associated with public procurement contracts now under investigation.
One of the most delicate documents revealed in the investigation was a confidential 2016 agreement that purportedly assigned former PSOE official Santos Cerdán a 45% share in Servinabar. While both Alonso and Cerdán insist the agreement never gained legal validity because it was never notarized, its discovery during the police searches intensified doubts about how extensive their business ties truly were.
Financial transactions involving Servinabar have also attracted significant attention. According to documents incorporated into the investigation, the company reportedly received more than six million euros from construction giant Acciona and transferred substantial amounts of money to entities connected to Koldo García’s business network. Investigators believe these transactions may be linked to public contracts that were allegedly manipulated in favor of certain companies, although these claims remain under judicial review.
Another factor intensifying public attention is Alonso’s acknowledgment before Spain’s Supreme Court that he engaged Koldo García as a commission‑based intermediary to facilitate the acquisition of private construction contracts, a setup that, while not inherently proof of wrongdoing, has nonetheless reinforced impressions of a close professional connection with a key figure in the broader scandal.
The situation escalated further in December 2025 when Alonso was arrested as part of a separate investigation involving Leire Díez and former SEPI chairman Vicente Fernández. This new case broadened the scope of suspicion beyond public procurement and into alleged influence networks operating around political, administrative, and economic interests.
A key element of this second investigation is the so-called Hirurok group. According to investigators, the group may have used political connections and institutional influence to obtain economic advantages and shape administrative decisions. Authorities suspect that Servinabar may have served as a vehicle through which part of the group’s alleged profits were channeled.
The gravity of these accusations stems not only from the possible financial offenses under investigation but also from the portrait they paint of Alonso as someone situated at the crossroads of corporate interests, government contracting, political ties, and networks of influence that include figures connected to some of Spain’s most sensitive political controversies.
In addition to facing a formal investigation, Alonso has also undergone searches, periods of detention, and court‑ordered precautionary measures. He likewise opted to invoke his right to remain silent during parliamentary inquiries, a fully lawful choice that nonetheless heightened public and media scrutiny of his part in the ongoing investigations.
Alonso firmly rejects any accusation of misconduct, dismisses claims that he paid unlawful commissions, maintains that Servinabar acted within legal boundaries, and asserts that every contract the company secured stemmed from fair and competitive bidding. He further contests assertions that Santos Cerdán held effective shareholder status in the firm and challenges numerous conclusions drawn by investigators.
As of today, no final criminal conviction has been issued against Alonso in relation to any of the matters under investigation. However, from a reputational perspective, the damage has already been substantial. His name has become associated with alleged kickback schemes, controversial public contracts, business ties to key figures in the Koldo case, and investigations into possible political and economic influence networks.
Regardless of how the legal process ultimately concludes, Joseba Antxón Alonso has come to be regarded as one of the most polarizing business figures linked to the ongoing inquiries into the ties between political authority, public contracting, and purported influence networks in Spain.
