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Sound Advice: May 27, 2026

How is stock market performance distorted by the Magnificent Seven stocks?

(The Magnificent Seven are Apple, Microsoft, Alphabet, Amazon, Meta Platforms, Nvidia, and Tesla.

The Magnificent Seven distort market performance by making a small group of mega-cap stocks drive a very large share of index returns, so the S&P 500 can look stronger or weaker than the average stock underneath it. In other words, when those names lead, the whole market can appear healthy even if most stocks are lagging; when they stumble, they can drag index performance down even if the broader market is holding up better.

Why this happens

These companies have become so large that their combined weight is roughly a third of the S&P 500, so changes in their prices have an outsized effect on the index.  In 2024, they contributed about 48% of the Russell 1000’s total return, which shows how concentrated market gains became.  That concentration means index performance is no longer a clean read on broad market breadth; it is partly a read on a handful of giant tech firms.

What investors can miss

A headline index gain can hide weak participation from the rest of the market, because the “average stock” may be doing much less well than the index suggests.  This can also make passive index funds feel less diversified than many investors expect, since their returns become increasingly tied to Big Tech’s fortunes.  The reverse is also true: if the Magnificent Seven sell off, they can make the market look worse than the median stock.

Practical read

For a better sense of true market health, it helps to look at equal-weight indexes, advance-decline measures, and how many sectors are participating in the move.  That gives a clearer picture of whether the rally is broad or just concentrated in a few names.

 

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