Source: https://mochatrade.com/learn/glossary/sp-500

# S&P 500
URL: https://mochatrade.com/learn/glossary/sp-500
Last modified: 2026-10-17

The S&P 500 is about five hundred of the largest American companies, weighted by market value, and the number money is measured against. Index funds copy it, the [VIX prices how far it is expected to swing](https://mochatrade.com/learn/start-here/how-to-read-us-market-news), and it is computed from each member's [official close at 1:30 AM IST](https://mochatrade.com/learn/us-market-structure/how-us-stock-prices-form). Its eleven sectors are how [a macro number reaches a single stock](https://mochatrade.com/learn/us-market-structure/how-us-stock-prices-form).

## Related terms

- CME Group: https://mochatrade.com/learn/glossary/cme-group
- Trading halt: https://mochatrade.com/learn/glossary/trading-halt
- Closing auction (official close): https://mochatrade.com/learn/glossary/closing-auction
- NASDAQ: https://mochatrade.com/learn/glossary/nasdaq
- SPY ETF: https://mochatrade.com/learn/glossary/spy-etf
- Volume: https://mochatrade.com/learn/glossary/volume