WESTLAKE, Texas–(BUSINESS WIRE)–The Schwab Trading Activity Index™ (STAX) increased to 57.32 in February, up from its score of 49.96 in January. The only index of its kind, the STAX is a proprietary, behavior-based index that analyzes retail investor stock positions and trading activity from Schwab’s millions of client accounts to illuminate what investors were actually doing and how they were positioned in the markets each month. “February’s score represented the biggest month-over-month per