THE BLOCK: Cboe is considering listing perpetual futures tied to its Volatility Index once there is greater regulatory clarity for the products in the U.S., Rob Hocking, global head of derivatives at Cboe, said Wednesday during a panel at the Bloomberg Intelligence Derivatives Market Structure Conference in New York. Cboe already offers VIX futures and options, but there is no way to trade the index's cash level directly. Hocking said perpetual futures could provide a solution. CBOE