17 C.F.R. § 3.45
(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—
[51 FR 45761, Dec. 22, 1986, as amended at 75 FR 55427, Sept. 10, 2010]