(a) Every registered management investment company shall file a report on Form N-CSR (§§ 249.331 and 274.128 of this chapter) not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under § 270.30e-1.

(b) A registered investment company shall file with the Commission a copy of every periodic or interim report or similar communication containing financial statements that is transmitted by or on behalf of such registered investment company to any class of such company's security holders and that is not required to be filed with the Commission under paragraph (a) of this section. The filing shall be made not later than 10 days after the transmission to security holders.