(1) Prior to the opening of the bidding window for the auctioning of two-day spot or five-day futures, bidders or any intermediaries acting on their behalf, are required to give collateral.

(2) If so requested, any unused collateral posted by an unsuccessful bidder, together with any interest accrued on cash collateral, is to be released, as soon as practicable after the close of the bidding window.

(3) If so requested, any collateral posted by a successful bidder that has not been used for settlement, together with any interest accrued on cash collateral, must be released, as soon as practicable after settlement.