(20)Regarding the specific criteria for group supervision under Article 380 of Delegated Regulation (EU) 2015/35, the BMA has the power to determine which undertakings fall under the scope of supervision at group level and supervise insurance or reinsurance undertakings which are part of a group. The BMA supervises all insurance or reinsurance undertakings over which a participating undertaking, as defined in Article 212(1)(a) of Directive 2009/138/EC, exercises a dominant or significant influence.