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Is the Stock Market as Diversified as You Think?

Jul 28, 2026 | Blog

We wanted to share something we’ve been paying close attention to lately. At E2E Financial we make it our mission to stay cutting edge with new discoveries so we can better serve you. Our strategic partners at Capital Group shared their thoughts here and we are breaking it down for you:

The market has been surprisingly narrow.

When you invest in a broad index fund, you might assume your money is spread evenly across hundreds of companies. But over the past few years, a small group of giant tech companies (think Apple, Microsoft, Nvidia, and a few others) have quietly grown to dominate those funds. Because of that, the performance of the entire U.S. stock market has largely depended on just a handful of names going up. Referred to as market concentration.

Why does it matter?

Imagine a basketball team where one player scores 80% of all the points. Great when they’re hot. Risky when they’re not.

The same logic applies here. When the market is this concentrated, a bad quarter from a few big names can drag down an otherwise healthy portfolio.

A lot of this comes back to AI.

The excitement around artificial intelligence has been a major driver of this concentration. Companies at the center of the AI boom have seen their stock prices soar. Nvidia alone accounted for roughly 20% of the S&P 500’s total return in a recent stretch. The AI opportunity is real and the long term potential is significant.

The important thing to remember is stay invested. We’re starting to see the market broaden back out. More companies across more industries are contributing to returns. That’s generally a sign of a healthier, more resilient market.

Click here to read Capital Group’s full insights.

At E2E financial we believe that both indexes and active management (see last weeks market update)

Now is a great time to take a closer look at what you actually own. Is your current financial planner staying up to date on current insights? We are! Sign up for your complimentary second opinion: schedule a complimentary consultation.

And as always, your weekly market update is here.

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