17 C.F.R. § 38.500 Core Principle 9.
The board of trade shall provide a competitive, open, and efficient market and mechanism for executing transactions that protects the price discovery process of trading in the centralized market of the board of trade. The rules of the board of trade may authorize, for bona fide business purposes:
(a) Transfer trades or office trades;
(b) An exchange of:
(1) Futures in connection with a cash commodity transaction;
(2) Futures for cash commodities; or
(3) Futures for swaps; or
(c) A futures commission merchant, acting as principal or agent, to enter into or confirm the execution of a contract for the purchase or sale of a commodity for future delivery if the contract is reported, recorded, or cleared in accordance with the rules of the contract market or a derivatives clearing organization.