17 C.F.R. § 1.70
(a) Immediately upon instituting any proceeding in any Federal district court for violation of the Act or any rule, regulation or order thereunder against any person who is subject to suit pursuant to sections 6d(1)-(6) of the Act, the authorized State official of the State instituting the proceeding shall submit to the Commission a copy of the complaint filed in the proceeding, together with a written notice which:
(2) Indicates the provision of the Act or the rule, regulation or order thereunder which is alleged to have been violated.
The complaint and written notice must be sent by first-class U.S. mail or personally delivered to the Secretary, at the Commission's Washington, DC headquarters.
(b) Prior to instituting any proceeding in a State court for the alleged violation of any antifraud provisions of the Act or any antifraud rule, regulation or order thereunder against any person registered with the Commission who is subject to suit pursuant to the provisions of section 6d(8) of the Act, the authorized State official of the State intending to institute the proceeding shall submit to the Commission written notice which:
(3) Contains a brief statement of the facts on which the proposed action will be based.
Except as provided in paragraph (c), this written notice must be sent by first-class U.S. mail or personally delivered to the Secretary, at the Commission's Washington, DC headquarters not less than 5 business days prior to instituting the proceeding in State court.
[48 FR 49503, Oct. 26, 1983, as amended at 60 FR 49334, Sept. 25, 1995]