For the purpose only of Section 5(b) of the Act (15 U.S.C. 77e(b) ), the term "prospectus" as defined in Section 2(a)(10) of the Act (15 U.S.C. 77b(a)(10) ) does not include a Statement of Additional Information filed as part of a registration statement on Form N-1A (§ 239.15A and § 274.11A of this chapter), Form N-2 (§ 239.14 and § 274.11a-1 of this chapter), Form N-3 (§§ 239.17a and 274.11b of this chapter), Form N-4 (§§ 239.17b and 274.11c of this chapter), or Form N-6 (§§ 239.17c and 274.11d of this chapter) transmitted prior to the effective date of the registration statement if it is accompanied or preceded by a preliminary prospectus meeting the requirements of § 230.430 .
17 C.F.R. §230.134b