Ten years ago, the top 10 companies in the S&P 500 made up just 18% of the index. Today, that figure has soared near to 40%. The original intent of investing in the S&P 500 was to pursue market-average returns while diversifying risk across 500 companies. However, with the top 10 companies now commanding such a large portion of the index, your investment is increasingly a bet on a handful of corporate giants.
Much like the rich getting richer...