S&P 500 investors may be more exposed to the AI trade than they think

Investing in an S&P 500 index fund might seem like a simple way to diversify your portfolio. However, according to Steve Sosnick, chief strategist at Interactive Brokers, investors often underestimate how much exposure they have to the AI trade when they hold such a fund. He suggests that an S&P 500 fund could expose an investor to AI-related stocks by around 40% to 45%.

This hidden concentration occurs because the S&P 500 is weighted based on market capitalization, meaning larger companies, many of which are involved in AI, dominate the index. As of early September, the top seven S&P 500 companies comprised over 34% of the index's value. Most of these companies are heavily involved in the AI boom, which does not necessarily make the fund unsuitable, but it does mean investors should examine the overlap between their broad index fund and their other holdings to ensure their overall exposure aligns with their risk tolerance.

Sosnick emphasizes reviewing positions by their shared economic exposure rather than just the number of different ticker symbols in the account. This perspective encourages investors to consider the broader implications of their investment choices, rather than focusing solely on short-term price movements.