17 CFR § 38.601 - Mandatory clearing.
(a) Transactions executed on or through the designated contract market must be cleared through a Commission-registered derivatives clearing organization, in accordance with the provisions of part 39 of this chapter. Notwithstanding the foregoing, transactions in security futures products executed on or through the designated contract market may alternatively be cleared through a clearing agency, registered pursuant to section 17A of the Securities Exchange Act of 1934.
(b) A designated contract market must coordinate with each derivatives clearing organization to which it submits transactions for clearing, in the development of rules and procedures to facilitate prompt and efficient transaction processing in accordance with the requirements of § 39.12(b)(7) of this chapter.