On 1 August 2025, Bulgaria introduced significant changes to its arbitration law, the title of which is now the Arbitration Act. The changes aim at promoting transparency and trust in arbitration proceedings. While some amendments were welcomed by practitioners in the field, others may raise questions, including of practical nature, related to excessive formality, administrative burdens and threat to the confidentiality. 1. Who is affected arbitration institutions with seat in Bulgaria; international arbitration institutions with seat outside of Bulgaria – when the place of the arbitration proceedings is in Bulgaria; ad hoc international arbitration tribunals – when the place of