Capitalization Weighting, Explained
The S&P 500 is a capitalization-weighted index. Each company’s weight equals its market value divided by the total market value of all 500 members. A company worth $3 trillion gets a much larger share of the index than a company worth $30 billion, simply because it represents more of the total.
That is the standard, and for decades it was uncontroversial. It reflects where investor money actually sits, and it requires almost no buying or selling to maintain. As a stock rises, its weight rises automatically.
The Magnificent Seven Problem
Capitalization weighting has a side effect. As a small number of companies grow very large, they crowd out everyone else. Apple alone is now roughly 7% of the index. The Magnificent Seven, Apple, Microsoft, Nvidia, Amazon, Meta, Tesla, and Alphabet, together sit at about 34%, or more than a third of the entire index.
That leaves the remaining 493 companies, the ones some analysts call the Forgotten 493, sharing the other two thirds. Our Magnificent Seven explainer covers the group in detail, and our concentration risk piece explains why the crowding matters for everyday investors.
Equal Weight as the Alternative
There is a straightforward fix: weight every company equally. An equal weight index gives each of the 500 members the same roughly 0.20% slice and rebalances back to that level every quarter, trimming the winners and adding to the laggards.
Larry Benedict’s Project 2026 campaign argues this matters right now, because Section 232 and Section 301 trade reviews could push money out of the giants and into the rest of the index. That is the same rotation dynamic we tracked in our space ETF coverage, where a diversified vehicle spreads the bet instead of concentrating it.
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