The Staff of the SEC also recently updated the procedures relating to nonpublic review of draft registration statements. Specifically, the following guidance was added:

The nonpublic review process is available for Securities Act registration statements prior to the issuer’s initial public offering date and for Securities Act registration statements within one year of the IPO. In identifying the initial public offering date, we will refer to Section 101(c) of the JOBS Act. The nonpublic review process is available for the initial registration of a class of securities under Exchange Act Section 12(b) on Form 10, 20-F or 40-F. [added August 17, 2017]

An issuer that has a registration statement on file and in process may switch to the nonpublic review process for future pre-effective amendments to its registration statement provided it is eligible to participate in the nonpublic review process and it agrees to publicly file its amended registration statement and all draft amendments in accordance with the time frame specified above. [added August 17, 2017]

See the procedures here: https://www.sec.gov/corpfin/announcement/draft-registration-statement-processing-procedures-expanded