Glossary · from the DESK dictionary
S&P 500 (SPX)
A stock index tracking the performance of 500 of the largest publicly listed US companies, widely regarded as the primary benchmark for the entire US stock market.
In plain words
Calculated using market-cap weighting, so larger companies have a proportionally greater influence on the index value.
What it means for traders
A fundamental, most widely watched benchmark index globally for investors and fund managers.
Common pitfalls
Increasingly concentrated in a few dominant technology companies, substantially affecting its diversification profile.
Related terms
E-mini S&P 500 Future (ES) · Index Concentration · Market-Cap-Weighted Index · Select Sector SPDRs (XLF, XLE, XLK and others) · SPDR (Standard & Poor's Depositary Receipt) · SPDR S&P 500 ETF (SPY)
From the DESK dictionary. For information only, not investment advice.
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DESK is a research tool and not investment advice. Page generated: 2026-10-12.