The Dow Jones Industrial Average is a single number — 53,185.90 as of the August 31, 2026 close — that summarizes the share prices of 30 large, established American companies. It is not the whole stock market, it is not weighted the way you'd assume, and "industrial" hasn't described it for decades. It is, however, the longest-running continuous barometer of American business, and understanding its quirks makes every market headline easier to read.
Born as a shortcut, 1896
Charles Dow, co-founder of Dow Jones & Company and first editor of The Wall Street Journal, had a practical problem: in the 1890s there was no simple way to say whether "the market" went up or down. Individual stocks were quoted in newspapers, but no summary figure existed. His solution, launched May 26, 1896, was almost crude — take the prices of twelve important industrial companies, add them up, divide by twelve. The average opened its life at 40.94.
The word industrial was a deliberate bet. Railroads dominated the respectable investment universe of the day (Dow already ran a railroad average), and industrial companies — sugar, leather, rubber, electricity — were considered speculative. Dow's index bet that making things would define the American economy. The roster grew to 20 stocks in 1916 and to 30 in 1928, and 30 it has stayed for nearly a century, through roughly sixty membership changes. Of the 1928 lineup, none remain today — the last original-era holdover, General Electric, exited in 2018. The oldest continuous member on the current roster is Procter & Gamble, added in 1932.
What the number means
The index is a price-weighted average: conceptually, the 30 share prices added together and divided — not by 30, but by a tiny, carefully maintained number called the divisor that preserves continuity across stock splits and membership swaps. Two consequences follow, and they surprise almost everyone. First, the index's level (points) has no unit — it is not dollars, and 52,000 doesn't mean anything is "worth" 52,000 of anything. Only changes in the level, especially percentage changes, carry information. Second, influence within the index follows share price, not company size: a $600 stock moves the Dow four times as hard as a $150 stock, even if the $150 company is ten times more valuable. The full mechanics, with a worked example from today's actual closing prices, are on our calculation page.
How companies get in — and out
There are no quantitative admission criteria. A committee that includes editors of The Wall Street Journal selects members by judgment: companies should have excellent reputations, demonstrated sustained growth, and be of interest to a large number of investors. In practice, changes are infrequent and often mechanically triggered — a merger, a spin-off, or a stock split that leaves a sector under-weighted. Exits read like a history of American business turning over: General Motors left via bankruptcy in 2009, Citigroup via crisis in the same year, ExxonMobil made way for cloud software in 2020, Intel for NVIDIA in 2024, and Verizon for Alphabet in June 2026. We keep the full current roster, with each member's story, on the Dow 30 page.
What it's genuinely good for
Professionals benchmark against the S&P 500, and index funds overwhelmingly track it instead — so why does the Dow still lead every evening newscast? Partly habit, but three of its virtues are real. Continuity: no other equity index offers 130 years of directly comparable daily history; when analysts line up 1929, 1987, 2008 and 2020, they're usually using the Dow. Legibility: thirty household names are easier to reason about than five hundred — when the Dow moves, you can actually look at the list and see why. A useful bias: because it tilts toward mature, dividend-paying businesses and away from the tech giants that dominate value-weighted indexes, the Dow's disagreements with the Nasdaq are a fast, free signal of whether a rally is broad or narrow. We quantify that relationship, with measured correlations, on the comparison page.
The fair criticisms
Serious people have called the Dow obsolete for fifty years, and the case has merit: thirty stocks are too few to represent a $60-trillion market; price weighting is an arithmetic accident with no economic rationale; and judgment-based membership famously missed nearly all of the great growth stories on the way up (it removed IBM in 1939 and only re-admitted it in 1979, skipping the most explosive computing decades in history — a decision studies have estimated cost the index thousands of points). All true. The practical response is not to discard the Dow but to read it for what it is: a venerable, quirky, blue-chip barometer — and to check anything important against a broader index. That is, in fact, exactly how this site treats it.