What’s the DTCC and How Did It Stop GameStop Mania?

Small investors and others watching the market gyrations around GameStop Corp. and other stocks have learned a long list of trading terms, including short squeeze, call options and gamma hedging. The decision by Robinhood Markets and other trading platforms to slam the door shut on the most volatile stocks is introducing them to two others, clearinghouse and collateral requirements. They’re parts of Wall Street’s infrastructure that are invisible except for when things get wild.