Kalshi Klear, the company's internal clearing house, files for CFTC approval to add margin trading as it seeks to attract institutional liquidity (Davis Giangiulio/CNBC)

Davis Giangiulio / CNBC: Kalshi Klear, the company's internal clearing house, files for CFTC approval to add margin trading as it seeks to attract institutional liquidity  —  Prediction market platform Kalshi filed on Tuesday with federal regulators to seek approval to offer leverage on event contracts …