[The U.S. SEC Allows Broker-Dealers to Use Russell 1000 and S&P 500 Index Constituents as Collateral] According to a report by Jinse Finance, the U.S. Securities and Exchange Commission (SEC) now permits broker-dealers to use constituents of the Russell 1000 Index and S&P 500 Index as collateral when borrowing securities. This move aims to enhance liquidity and strengthen risk management in the lending market.