18.8.4 Margin Requirements
(1) The OCC may from time to time prescribe the amount of margin required to be deposited in respect of customers' and Trading Members' outstanding short positions and all matters in connection thereto. Trading Members shall adhere to such prescribed margin and all matters prescribed by the OCC and/or the Regulations in connection thereto. Such matters shall include, without limitation:—
(a) the forms of margin acceptable for deposit;
(b) the procedures and manner of acceptance, deposit, release and withdrawal of cash deposited as margin, marginable securities and underlying securities of Scrip-Covered Call Options; and
(c) the establishment and operation of trust accounts for cash deposited as margin by customers.
(2) All requests for the deposit and release of underlying securities for Scrip-Covered Call Options or margins securities or cash margins shall be made through Trading Members and the OCC or the CDP shall not be obliged to communicate with or take instructions directly from customers of Trading Members.
(3) All requests for the release of securities or cash margins shall be made on the prescribed form and shall be lodged by the customer with the Trading Member with whom he has deposited the said securities before 12.30 p.m. on any Market Day in order to obtain a release of the securities by 9.00 a.m. the following Market Day, subject to the Trading Member's confirmation and endorsement of the release.