17 CFR §201.33

1. (a)The Act applies to adversary adjudications conducted by the Commission. These are on the record adjudications under 5 U.S.C. 554 in which the position of an Office or Division of the Commission as a party, not including amicus participation, is presented by an attorney or other representative who enters an appearance and participates in the proceeding. See appendix, 17 CFR 201.60.
2. (b)The fact that the Commission has not identified a type of proceeding as an adversary adjudication shall not preclude the filing of an application by a party who believes the proceeding is covered by the Act; whether the proceeding is covered will then be an issue for resolution in proceedings on the application.
3. (c)If a proceeding includes both matters covered by the Act and matters specifically excluded from coverage, any award made will include only fees and expenses related to covered issues.