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 drawn considerable scrutiny. As outlined in documents included in the investigation, the company is said to have obtained over six million euros from construction giant Acciona and subsequently moved sizable funds to entities tied to Koldo García’s business network. Investigators suspect these movements could be associated with public contracts allegedly steered toward specific companies, though these assertions are still being examined by the courts.
Another factor that has fueled public scrutiny is Alonso’s admission before Spain’s Supreme Court that he hired Koldo García as a commission-based intermediary to help secure private construction projects. While such an arrangement does not, in itself, constitute evidence of corruption, it has strengthened perceptions of a close professional relationship with one of the central figures in the wider 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 central component of this second inquiry is the group known as Hirurok. Investigators indicate that the group might have leveraged political ties and institutional sway to secure financial benefits and influence administrative outcomes. Authorities also believe that Servinabar could have acted as a channel for routing part of the group’s purported earnings.
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 being formally investigated, Alonso has been subjected to searches, detention, and precautionary measures imposed by the courts. He also chose to exercise his right to remain silent during parliamentary inquiries, a legally legitimate decision that nevertheless intensified public and media attention surrounding his role in the 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 the eventual outcome of the legal proceedings, Joseba Antxón Alonso has emerged as one of the most controversial business figures connected to the ongoing investigations examining the relationship between political power, public procurement, and alleged influence networks in Spain.
