1. Where Member States allow their supervisory authorities to make the decision referred to in Article 216, they shall also allow them to decide to conclude an agreement with supervisory authorities in other Member States where another related ultimate parent undertaking at national level is present, with a view to carrying out group supervision at the level of a subgroup covering several Member States.

Where the supervisory authorities concerned have concluded an agreement as referred to in the first subparagraph, group supervision shall not be carried out at the level of any ultimate parent undertaking referred to in Article 216 present in Member States other than the Member State where the subgroup referred to in the first subparagraph of this paragraph is located.

In such a case, the supervisory authorities shall explain their agreement to both the group supervisor and the ultimate parent undertaking at Union level. The group supervisor shall inform the college of supervisors in accordance with Article 248(1)(a).

2. Article 216(2) to (6) shall apply mutatis mutandis.

3. The Commission shall adopt delegated acts in accordance with Article 301a specifying the circumstances under which the decision referred to in paragraph 1 of this Article can be made.