Dow Jones
The oldest index, built from the share prices of 30 leading U.S. blue-chip companies — it is price-weighted, so stocks with a high price per share carry more influence.
Dow Jones Industrial Average = the share prices of 30 leading U.S. blue-chip companies, price-weighted
When the Dow, S&P 500, and Nasdaq all rise together, it reads as broad market strength; when they diverge, it reads as a phase where one side (traditional large caps vs.
In plain terms
The Dow Jones is the longest-running stock index, made up of 30 leading U.S. blue-chip companies. It has been around for over 100 years and shows up often in the news, as in "the Dow rose so many points."
What is unusual is that weights are set by the "share price" itself, not by company size (market cap). So stocks with a high price per share have a bigger effect on the index.
What it tells you
Holding only 30 blue chips, the Dow shows the mood of traditional U.S. large caps. It is familiar and has a long history, so it is often cited symbolically.
That said, with only 30 stocks and price weighting, it is seen as more limited than the S&P 500 in representing the whole market.
Formula
Dow Jones Industrial Average = the share prices of 30 leading U.S. blue-chip companies, price-weighted (the higher the "share price" — not the market cap — the bigger the influence)
What high or low means
When the Dow, S&P 500, and Nasdaq all rise together, it reads as broad market strength; when they diverge, it reads as a phase where one side (traditional large caps vs. tech stocks) is stronger.
If only the Dow lags or leads among the three, it may come from its concentration in just 30 blue chips.
The Dow uses the distinctive "price weighting" method, so a stock with a high price per share can move the index more even if its business is smaller. Its character differs from the market-cap-based S&P 500, and the S&P 500 is regarded as better at representing the market.
With only 30 stocks, it's a narrow window on the whole market. The S&P 500 is generally treated as the more representative yardstick.
Index quotes are market data. This term is background knowledge for understanding market news. (※ Our screens deal with individual companies' SEC-filed financials.)
Metrics to read alongside
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This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.