Concentration Risk Rises as AI Mega-Caps Drive U.S. Gains

Concentration risk has increased as U.S. market gains depend on a small group of large companies with exposure to artificial intelligence. So far this year, market attention has focused on geopolitical tensions tied to conflicts involving Venezuela and Iran and renewed debate over an AI-driven market bubble. Several large tech and AI initial public offerings are expected in the coming months, which market participants say could produce sharp price swings.

Heavy portfolio exposure to a handful of mega-cap stocks leaves investors vulnerable to sudden reversals. Potential triggers include disappointing earnings, cooling enthusiasm after an IPO debut — Anthropic is one commonly cited example — and higher-than-expected inflation that prompts interest-rate increases. Firms and sectors closely tied to AI spending or elevated valuation multiples could be affected more than others.

Some investors are shifting part of their allocations into international equity funds to reduce reliance on U.S. mega-caps. One such fund, the American Century Quality Diversified International ETF (QINT), targets large- and mid-cap stocks outside the United States. The fund applies a quality screen that seeks companies with growth potential, solid financials and attractive fundamentals, and uses a multi-factor approach that balances growth and value while emphasizing larger, lower-volatility names.

QINT charges 34 basis points. Over the past 12 months the ETF returned 26.6% and outperformed the average in the ETF Database Foreign Large Cap Equities category during that period, according to ETF Database data. Technical indicators tracked by the fund show its price trading above both the 50-day and 200-day simple moving averages, a common measure of momentum.

Index governance for QINT is disclosed: VettaFi LLC is the index provider and receives an index licensing fee. VettaFi does not issue, sponsor, endorse or sell the ETF and has no obligation or liability in connection with its issuance, administration, marketing or trading.

Concentration risk, upcoming large AI-related IPOs and geopolitical uncertainty are present factors in current market conditions. Investors holding large positions in a few U.S. technology names have moved some capital into diversified international funds; diversification does not eliminate market risk.