It's been an excellent year for stock market investors. The S&P 500 index has delivered an excellent 26% return thus far in 2024, driven by resilient macroeconomic conditions, record corporate earnings, and growing optimism about artificial intelligence's (AI) transformative potential across the economy.Palantir Technologies (PLTR 0.47%) and International Business Machines (IBM -0.83%) are technology sector leaders capturing strong demand for innovative AI applications, propelling the two stocks to an all-t ...