The top 10 names in the S&P 500 account for roughly 30% of the entire index. This is great news because nearly everyone one of them is in the chart above. However, this is something Ed and I are keeping a close watch on when we are constructing portfolios.
If these large-cap names, which make up most of the indexes decide to sell off, it could be potentially disastrous for large market cap indexes. Before you think, “that can’t happen” keep your history lessons in mind. Many of the high flyers from the past (GE, Xerox, AIG) went on to crater. All of these stocks were considered “too big to fail” and a “sure thing” by the financial press.
Now, this isn’t a hit piece on passive indexes or large market cap companies, however, it is a reminder that things to do change over time. Just look at the chart below which breaks down the top 10 holdings in the S&P 500 by decade dating back to the 1980s. Oil, GE, and AIG were all no-brainers in the 80s and 90s. Fast forward to today, the entire energy market makes up less than 3% of the S&P 500, GE is down roughly 80% from its all-time high in 2000, and AIG has lost 96% of its value from the peak.