17 C.F.R. § 240.0-2 Business hours of the Commission.
Title 17 - Commodity and Securities Exchanges
(a) The principal office of the Commission, at 450 Fifth Street, NW., Washington, DC 20549, is open each day, except Saturdays, Sundays, and federal holidays, from 9 a.m. to 5:30 p.m., Eastern Standard Time or Eastern Daylight Saving Time, whichever currently is in effect in Washington, DC, provided that hours for the filing of documents pursuant to the Act or the rules and regulations thereunder are as set forth in paragraphs (b) and (c) of this section. (b) Submissions made in paper. Paper documents filed with or otherwise furnished to the Commission may be submitted to the Commission each day, except Saturdays, Sundays and federal holidays, from 8 a.m. to 5:30 p.m., Eastern Standard Time or Eastern Daylight Saving Time, whichever is currently in effect. (c) Electronic filings. Filings made by direct transmission may be submitted to the Commission each day, except Saturdays, Sundays and federal holidays, from 8 a.m. to 10 p.m., Eastern Standard Time or Eastern Daylight Saving Time, whichever is currently in effect. For registration and exemption of exchanges, see §§240.6a–1 to 240.6a–3. For forms for permanent registration of securities, see §240.12b–1. For regulations relating to registration of securities, see §§240.12b–1 to 240.12b–36. For forms for applications for registration of brokers and dealers, see §§240.15b1–1 to 240.15b9–1. [58 FR 14682, Mar. 18, 1993, as amended at 65 FR 24801, Apr. 27, 2000; 68 FR 25799, May 13, 2003]
Title 17: Commodity and Securities Exchanges
PART 240—GENERAL RULES AND REGULATIONS, SECURITIES EXCHANGE ACT OF 1934
Subpart A—Rules and Regulations Under the Securities Exchange Act of 1934
Rules of General Application
§ 240.0-2 Business hours of the Commission.

