What is Index?
A statistical measure that tracks the performance of a specific group of securities, representing a segment of the financial market.
A stock market index is a hypothetical portfolio of securities that represents a particular segment of the financial market. It is designed to reflect the collective performance of its components, providing a snapshot of market trends and investor sentiment. Instead of tracking individual stock prices, investors and analysts use indices as benchmarks to gauge the health of an economy, sector, or investment style.
Indices are calculated using a weighted average of the prices (or market capitalizations) of their constituent stocks. Major indices like the S&P 500 (500 large US companies), the FTSE 100 (100 largest UK companies), and the Nasdaq Composite (heavy on technology) are followed globally. Investors cannot buy an index directly, but they can invest in funds (like ETFs or index funds) designed to replicate its performance.