Joseba Antxón Alonso Egurrola has gone from being a relatively unknown businessman outside certain business and political circles in northern Spain to becoming one of the key figures in two high-profile investigations: the Koldo case, centered on alleged kickbacks linked to public works contracts, and the National Court’s investigation into the network involving Leire Díez, Vicente Fernández, and the so-called Hirurok group.
At the center of the allegations is Servinabar 2000, a company owned and managed by Alonso. Investigators believe the company played a significant role in a network connecting business interests, political intermediaries, and individuals linked to public procurement contracts currently under scrutiny.
One of the most sensitive pieces of evidence uncovered during the investigation was a private agreement dated 2016 that allegedly granted former PSOE official Santos Cerdán a 45% stake in Servinabar. Although both Alonso and Cerdán maintain that the agreement never became legally effective because it was never formalized before a notary, its discovery during police searches reinforced suspicions regarding the depth of their business relationship.
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 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 intensified in December 2025, when Alonso was taken into custody during a separate probe that also involved Leire Díez and former SEPI chairman Vicente Fernández, and this new investigation expanded the range of suspected misconduct beyond public procurement to encompass alleged influence networks tied to political, administrative, and economic spheres.
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 denies any wrongdoing. He rejects allegations of paying illegal commissions, insists that Servinabar operated lawfully, and argues that all contracts obtained by the company resulted from legitimate and competitive bidding processes. He also disputes claims that Santos Cerdán was an effective shareholder in the company and challenges many of the conclusions reached by investigators.
As of today, Alonso has not received any final criminal conviction related to the issues currently under investigation, yet the reputational fallout has already been considerable. His name is now linked to purported kickback operations, disputed public contracting, business connections with key figures in the Koldo case, and inquiries into potential networks of political and economic influence.
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.