What the Data Shows
The S&P 500 is compared with United States GDP using a May 29, 2026 index-provider market-cap snapshot and IMF April 2026 WEO GDP. The data uses S&P 500 constituent market capitalization in current US dollars and the IMF current-price United States GDP denominator. S&P Dow Jones Indices reported US$67.80 trillion of S&P 500 constituent market cap, equal to 209.4% of the US$32.38 trillion GDP benchmark. The S&P numerator covers index constituents rather than every United States public company, and the GDP denominator is an IMF WEO outlook value.
Data table
Unit: current US$ trillions and percent of GDP · Period: May 29, 2026 index snapshot with IMF April 2026 WEO GDP denominator
| Rank | Entry | Value | Period |
|---|
| 1 | S&P 500 market cap | US$67.80T | May 29, 2026 index snapshot |
| 2 | U.S. GDP, 2026 IMF WEO | US$32.38T | IMF April 2026 WEO |
Sources
Source 1: S&P Dow Jones Indices
Publisher: S&P Dow Jones Indices
Dataset/table: Country/Region Breakdown and Index Characteristics
Units: current US$ millions
Date checked: 2026-05-30
Evidence: Supports the May 29, 2026 S&P 500 constituent market-cap snapshot.
Source 2: IMF World Economic Outlook Database
Publisher: International Monetary Fund
Dataset/table: World Economic Outlook Database
Units: current US$ billions/trillions
Date checked: 2026-05-30
Evidence: Supports the 2026 current-price U.S. GDP benchmark.
Data notes & caveats
This benchmark mixes a market snapshot with IMF WEO current-price GDP. It should not be presented as total national stock-market capitalization.
Methodology
S&P 500 constituent market capitalization is divided by IMF current-price United States GDP and expressed as a percentage.
Source consistency notes
The numerator comes from S&P DJI as of May 29, 2026; the denominator comes from IMF April 2026 WEO.
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