U.S. stock markets opened in positive territory on Monday, with the Nasdaq Composite leading gains at 0.93%. The Dow Jones Industrial Advanced rose 0.71%, while the S&P 500 index climbed 0.49% at the opening bell. The broad-based rally across major U.S. indices signals renewed risk appetite among investors as the trading week begins. All three benchmark indexes posted immediate gains, reflecting optimistic market sentiment at the start of the session.