Clear Street is a financial technology firm founded in 2018 that modernizes capital markets infrastructure with a cloud-native platform for clearing, custody, prime brokerage, and trading across multiple asset classes including equities, options, futures, and fixed income. It serves over 700 institutional clients, processes ~550 million shares and $28.4 billion notional daily, and has raised $1.0 billion in capital. The company positions itself as a replacement for legacy systems, offering speed, transparency, and scalability to sophisticated investors and trading firms.