Forget the top 5, these stocks were the biggest movers in the S&P 500 in 2023

The 50 most valuable companies in the benchmark, which now make up about 56% of its total weight, moved up or down on average nine places this year, tied for the most since at least 2013 and almost double in 2019. And that volatility comes even as the median valuation gap between each company in the top 50 has more than doubled to $7 billion since 2013.