The Dow Jones Industrial Average (DJIA) is a stock market index comprising 30 major U.S. blue-chip companies. It was created by Charles Dow — editor of The Wall Street Journal and co-founder of Dow Jones & Company.
The DJIA is the oldest continuously calculated U.S. market index, first published on May 26, 1896. It is a price-weighted average of its component stocks’ share prices. The term “Industrial” is now largely historical: several index constituents operate outside the industrial sector, including technology, financial services, and consumer goods firms.
Index composition is not fixed. Components are periodically reviewed and adjusted by the editors of The Wall Street Journal to reflect shifts in the U.S. economy and corporate leadership.
Because it tracks only 30 companies, the Dow Jones Industrial Average does not fully represent overall U.S. equity market activity. For broader context, traders and analysts often reference complementary indices such as the Nasdaq Composite Index and the S&P 500.
FAQ
What does the Dow Jones Industrial Average measure?
It measures the price-weighted average of 30 large, publicly traded U.S. companies — widely regarded as industry leaders and economic barometers.
Is the DJIA price-weighted or market-cap-weighted?
It is price-weighted: stocks with higher share prices have greater influence on index movements, regardless of company size or market capitalization.
Why doesn’t the DJIA include more than 30 stocks?
By design, it prioritizes simplicity and historical continuity over breadth — serving as a focused benchmark for large-cap U.S. equities since 1896.
