S.C. Code Ann. § 35-1-401
(b) The following persons are exempt from the registration requirement of subsection (a):
(1) a broker-dealer without a place of business in this State if its only transactions effected in this State are with:
(F) a bona fide preexisting customer whose principal place of residence is in this State but was not present in this State when the customer relationship was established, if:
(d) A rule adopted or order issued under this chapter may permit:
(1) a broker-dealer that is registered in Canada or other foreign jurisdiction and that does not have a place of business in this State to effect transactions in securities with or for, or attempt to effect the purchase or sale of any securities by: