Stocks are building on Monday's momentum, led by a broadening rally in tech, communications, and materials. The S&P 500 (SPX) recaptured its 20-day moving average, with the next key level of resistance at new all-time highs. However, Monday's advance was marred by light volume, which Kevin Green attributes to cautious buyers. In earnings news, General Motors (GM) beat estimates, citing tariff relief and demand pockets in certain markets. Meanwhile, GE Aerospace (GE) also reported strong results, driven by aftermarket maintenance and a potential Boeing (BA) order rebound.