Leverage customer
(d) Leverage customer means any person who, directly or indirectly, enters into, purchases, sells, or otherwise acquires for value any interest in a leverage contract with, from or to a leverage transaction merchant: Provided, however, That an owner or holder of a proprietary leverage account as defined in paragraph (e) of this section shall not be deemed to be a customer within the meaning of 31.11(a)-(j) and (l), 31.12 and 31.26, and such an owner or holder of such a proprietary leverage account shall otherwise be deemed to be a leverage customer within the meaning of all other sections of these rules.
Source
17 CFR § 31.4
Scoping language
For the purposes of this part