Spain’s gambling regulator has opened a new procedure against Adventure One QSS, the company behind the crypto-based prediction market platform Polymarket. The notice was published in Spain’s Official State Gazette on 26 May 2026. The Spain gambling probe relates to Law 13/2011 on gambling regulation.

• The case was started by the Subdirectorate General for Gambling Regulation, part of Spain’s consumer and gambling authority. The notice is dated 20 May 2026. It was published because direct notification to the company could not be completed.
• The file is listed as ES/2026-027. The named company is Adventure One QSS Inc. The act type is described as “Acuerdo Inicio”, meaning the start of the procedure.
• The BOE notice does not publish the full case details. It says the full file is available through Spain’s Directorate General for Gambling Regulation. This means the Spain gambling probe is public, but the detailed allegations are not included in the notice.
• The procedure has been opened under Title VI of Law 13/2011. That section covers Spain’s gambling enforcement framework. The notice does not state any fine amount or final sanction.
• The notification takes effect from the day after publication. As the notice was published on 26 May 2026, the effect begins on 27 May 2026. Adventure One QSS can access the full act through the regulator’s electronic office.

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