17 CFR 41.48 - Undermargined accounts.
(a) Failure to satisfy margin call. If any margin call required by this Regulation (Subpart E, §§ 41.42 through 41.49) is not met in full, the security futures intermediary shall take the deduction required with respect to an undermargined account in computing its net capital under SEC or Commission rules.
(b) Accounts that liquidate to a deficit. If at any time there is a liquidating deficit in an account in which security futures are held, the security futures intermediary shall take steps to liquidate positions in the account promptly and in an orderly manner.
(c) Liquidation of undermargined accounts not required. Notwithstanding § 41.44(a)(1) of this subpart, § 220.4(d) of Regulation T (12 CFR 220.4(d)) respecting liquidation of positions in lieu of deposit shall not apply with respect to security futures carried in a securities account.