Kalshi plans to seek approval for roughly 60 perpetual futures linked to stocks and ETFs.Citadel Securities argues equity-linked perps should remain under SEC oversight alongside stocks and listed options.Kalshi received CFTC approval for Bitcoin perpetual futures, now challenged by CME in federal court.Perpetual futures trade without expiration dates and use funding payments to track underlying asset prices.Citadel warns around-the-clock equity derivatives could create surveillance gaps during stock-market closures and trading halts.