[Cboe, Citadel Securities, and Others Sue CFTC to Revoke Approval for Perpetual Stock Contracts] According to an official announcement from Cboe, the Chicago Board Options Exchange (Cboe) has joined the industry group Capital Markets Alliance (CMA) in its lawsuit against the U.S. Commodity Futures Trading Commission (CFTC), challenging the CFTC's approval of perpetual derivatives for individual U.S. stocks. CMA members include Cboe, Citadel Securities, and the Healthy Markets Association. The CMA has filed the lawsuit in the U.S. District Court for the Southern District of New York, seeking to revoke the relevant approvals, determine that such products are security-based swaps, and prohibit the approvals from taking effect during the litigation process.