Magnificent Seven Share of the S&P 500

## What this measures

The market value of the seven largest U.S. technology companies as a share of the market value of every company in the S&P 500.

## Why it matters

Concentration this high means a fund that tracks the S&P 500 is, in practice, a large bet on a few companies. It also means news about AI spending, antitrust or one company's earnings can move the whole index.

## How to read it

The share was 20.6% at the end of 2022 and 34.9% on October 8, 2026.

## What it does not say

It covers today's S&P 500 members back in time, using each company's current share count, so earlier readings leave out companies that have since left the index and ignore buybacks and new issuance. It is total market value, not the index's float-adjusted weight.

## Source

Received through a licensed market data provider. Calculated by Palanor.