Clear Street is building financial infrastructure for today's institutions. Clients of all sizes use our clearing, custody, execution, and prime brokerage platform to operate their businesses., The financial industry still relies on outdated technology developed in the 1970s. 50-year-old COBOL mainframes are still in use today?, creating a number of complex problems. Over time, firms built new technology on top of antiquated technology. This process is not only frustrating and inefficient—it kills profit margins and can blow up a firm.