12 C.F.R. § 221.121
Questions have been raised as to whether certain stock option and stock purchase plans involve extensions of credit subject to this part when the participant is free to cancel his participation at any time prior to full payment, but in the event of cancellation the participant remains liable for damages. It thus appears that the participant has the opportunity to gain and bears the risk of loss from the time the transaction is executed and payment is deferred. In some cases brought to the Board's attention damages are related to the market price of the stock, but in others, there may be no such relationship. In either of these circumstances, it is the Board's view that such plans involve extensions of credit. Accordingly, where the security being purchased is a margin security and the credit is secured, directly or indirectly, by any margin security, the creditor must register and the credit must conform with either the regular margin requirements of § 221.3(a) or the special "plan-lender" provisions set forth in § 221.4 , whichever is applicable. This assumes, of course, that the amount of credit extended is such that the creditor is subject to the registration requirements of § 221.3(b) .
12 C.F.R. §221.121