Treasury Secretary Janet Yellen has called a meeting with top financial institutions to discuss recent volatility in financial markets related to GameStop Corp., a Treasury spokeswoman confirmed Tuesday night.Ms. Yellen, who chairs a council of regulators that keeps track of financial stability risks, has asked for a meeting with officials at the Securities and Exchange Commission, the Federal Reserve, the New York Fed and the Commodity Futures Trading CommissionThe meeting, which is expected to take place as early as Thursday, was previously reported by Reuters.A group of day traders rallied together in recent weeks to acquire shares of GameStop, driving up the price over 10-fold and prompting complaints that the frantic activity was manipulative.