GREENWICH, Conn. — Interactive Brokers Group (Nasdaq: IBKR), a global brokerage firm, announced today that on Friday it lifted all trading restrictions on options in AMC, BB, EXPR, GME, KOSS and other options that experienced recent market volatility. The options, as well as the underlying stocks, are currently subject to increased margin requirements, which are subject to change depending on market conditions. The firm continues to monitor these volatile markets. Read More