Amendments to the Hungarian Competition Act (Act LVII of 1996 on the prohibition of unfair and restrictive practices) entered into force in June 2015. Both substantive and procedural amendments took place. The most important changes from a procedural point of view concern the shortening of the simplified merger procedures and the introduction of the ‘warning’ as a preventive sanction on small and medium-sized enterprises. Several smaller fine-tuning measures were also taken which provide for more efficient and consumer-friendly law enforcement. The activity of the Hungarian Competition Authority (Gazdasági Versenyhivatal – GVH) relating to the fight against cartels also played an essential role in 2015; consequently, the GVH launched an intensive campaign to raise awareness of both the serious consequences of a cartel and the leniency policy.