17 CFR § 3.45 - Restrictions upon activities.
(a) Subject to the provisions of § 3.46 of this subpart and all of the obligations imposed on such registrants under the Act (in particular, section 14 thereof) and the rules, regulations and orders thereunder, an applicant for registration as an introducing broker who has received written notification that a temporary license has been granted may act in the capacity of a guaranteed introducing broker.
(b) An applicant for registration as an introducing broker who has received a temporary license may be guaranteed by a futures commission merchant or retail foreign exchange dealer other than the futures commission merchant or retail foreign exchange dealer which provided the initial guarantee agreement described in § 3.44(a)(1) of this subpart: Provided, That, at least 10 days prior to the effective date of the termination of the existing guarantee agreement in accordance with the provisions of § 1.10 (j)(5) of this chapter, or such other period of time as the National Futures Association may allow for good cause shown, the applicant files with the National Futures Association—
(1) Written notice of such termination and
(2) A new guarantee agreement with another futures commission merchant or retail foreign exchange dealer effective the day following the last effective date of the existing guarantee agreement.