17 CFR §274.150

1. (a)Except as provided in paragraph (b) of this section, this form shall be used by registered management investment companies or exchange-traded funds organized as unit investment trusts, or series thereof, to file reports pursuant to § 270.30b1-9 of this chapter not later than 60 days after the end of each fiscal quarter.
2. (b)Form N-PORT shall not be filed by a registered open-end management investment company that is regulated as a money market fund under § 270.2a-7 of this chapter or a small business investment company registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), or series thereof.