17 C.F.R. § 270.30b1-10
Current report for open-end and closed-end management investment companies
Every registered open-end management investment company, or series thereof, and every registered closed-end management investment company, but not a fund that is regulated as a money market fund under § 270.2a-7, that experiences an event specified on Form N-RN, must file with the Commission a current report on Form N-RN within the period and according to the instructions specified in that form.