The Commodity Futures Trading Commission has proposed allowing swap execution facilities (SEFs) to list permitted transactions without offering an order book. The amendment would remove the order book requirement under Commission regulation § 37.3(a)(2), while leaving the requirement for required transactions unchanged. The proposal reflects the Commission’s observation that market participants rarely use order books for permitted transactions, despite their availability for all swaps listed by SEFs. Removing the requirement would give SEFs greater flexibility in allocating resources and could support execution methods better suited to their listed products. Comments will be accepted for 30 days after the proposal is published in the Federal Register.