I Asked ChatGPT How the Stock Market Would Look If We Ignored the 7 Biggest Stocks

Most people invested in the stock market, whether through retirement accounts or other kinds of brokerage accounts, are likely holding stock in the Magnificent 7. These seven megacap tech companies have driven a huge portion of U.S. market gains over the past few years, especially since 2023.

They are Apple (AAPL), Microsoft (MSFT), Nvidia (NVDA), Google’s parent company Alphabet (GOOGL), Amazon (AMZN), Meta Platforms (META) and Tesla (TSLA).

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Because the S&P 500 and most index funds are weighted by company size, these stocks now make up an unusually large share of the overall market. I asked ChatGPT to help me play out what it would look like if these seven stocks did not dominate the market, particularly on the portfolios of the average American.

Also see what investors should expect from the Magnificent 7 in 2026.

The S&P 500 Would Look Much Flatter

If you’ve been enjoying your portfolio gains, you might have the Magnificent 7 to thank, according to ChatGPT, as they account for roughly 25% to 35% of the S&P 500’s total value, depending on recent price moves. In some recent years, they have contributed the majority of the index’s gains.

If they disappeared from the market, the S&P 500’s recent returns would be significantly lower, and so would your portfolio gains. Additionally, some years that looked like strong bull markets would look modest or even flat.

In other words, ChatGPT said that a lot of what feels like “the market doing great” has actually been “seven stocks doing great.” Your portfolio performance has been heavily influenced by a small handful of companies.

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Your 401(k) Would Be Less Tech-Heavy

Right now, many workers don’t realize how tech-concentrated their “diversified” retirement accounts really are. Most Americans own the Magnificent 7 indirectly through one of the following kinds of funds:

• Target-date retirement funds.

Without those seven companies, the tech percentage of your portfolio would shrink dramatically. On the other hand, other sectors could have more influence. It could also potentially decrease volatility.

Removing the Magnificent 7 would make portfolios look more balanced across sectors, but it would also likely show slower growth.

Market Risk Would Look Different

When it comes to risk, ChatGPT said there are two sides to this.

On the one hand, with the Magnificent 7, you have higher concentration risk, stronger growth during tech and artificial intelligence (AI) booms, and bigger swings if tech sells off.

Without the Magnificent 7, you have broader participation from smaller companies, less dependence on the AI boom and potentially steadier but slower growth.

International Markets Would Look Relatively Stronger

The Magnificent 7 stocks have played a large part in U.S. market dominance, ChatGPT said. If you removed them, U.S. stock returns would more likely resemble international markets, and global diversification might look more attractive to investors.

Retirement Portfolios Would Likely Be Smaller

The reality is that if you strip out the Magnificent 7’s outsize gains over the past few years, many retirement balances would be significantly lower, ChatGPT said. Target-date funds would also show weaker performance. However, wealth inequality among investors might be slightly reduced.

These companies have created enormous wealth for retirement savers — especially those consistently invested through index funds.

What This Means for the Average Investor

What does it mean if you’re heavily invested in the Magnificent 7? Here’s what ChatGPT said:

• You’re more concentrated than you think.

• Your retirement growth has been tech-driven.

• Diversification still matters.

• Long-term discipline still wins.

In short, you don’t own “seven stocks.” You own a slice of the U.S. economy. Those seven companies just happen to be the biggest slice right now. However, market leaders eventually change with time.

Editor’s note: This article is for informational purposes only and does not constitute financial advice. Investing involves risk, including the possible loss of principal. Always consider your individual circumstances and consult with a qualified financial advisor before making investment decisions.

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