The S&P 500 is on track for its best annual gain, driven by strong megacap tech performance and a post-election rally. The index has risen over 24% year-to-date, printing over record highs and adding nearly $6 trillion in market value. Nvidia's earnings and influence on major indexes highlight its pivotal market role. Analysts suggest pro-growth policies and deregulation could sustain momentum. Corporate earnings growth and strong consumer spending also bolster optimism.
