CNBC reported that while the S&P 500 has quadrupled in value over the past decade, experts note the index is at risk due to its high concentration in the information technology and communication services sectors, which together account for nearly 50% of its weight. Mitch Goldberg, president of ClientFirst Strategy, stated that this concentration makes the S&P 500 vulnerable to volatility, especially given its AI-related holdings. Experts advise investors to reduce volatility and avoid over-reliance on "yesterday's winners" by increasing allocations to international stocks, small-cap stocks, fixed income (such as short-term government bonds), and gold.