The Dow Jones Industrial Average contains 30 stocks
The Dow Jones Industrial Average (often called "the Dow") tracks 30 large U.S. companies. These are not the 30 largest companies by market value — they are 30 companies chosen by the editors of the Wall Street Journal to represent different sectors of the economy. The list changes occasionally when a company is removed and replaced, but the number has stayed at 30 since 1928.
The 30 stocks are weighted by price, not by market value. This means a stock that costs $300 per share moves the index more than a stock that costs $100 per share, even if the cheaper stock belongs to a much larger company. Because of this weighting method, the Dow behaves differently from other major indexes like the S&P 500 or the Nasdaq-100.
Key Takeaways
- The Dow contains exactly 30 stocks, chosen to represent major sectors of the U.S. economy.
- Stocks are weighted by price per share, so a high-priced stock has more influence on the index movement than a low-priced one.
- The 30 companies change rarely — the Wall Street Journal removes and replaces stocks only when circumstances warrant it.
- The Dow is one of three major U.S. stock indexes; the S&P 500 tracks 500 companies and the Nasdaq-100 tracks 100 technology-heavy stocks.
Which sectors the 30 stocks represent
The 30 Dow stocks span industries including technology, healthcare, finance, consumer goods, energy, and manufacturing. Companies like Apple, Microsoft, and Intel represent technology. JPMorgan Chase and Goldman Sachs represent finance. Procter & Gamble and Coca-Cola represent consumer staples. Chevron and ExxonMobil represent energy.
The composition shifts over time as the economy changes. In the 1980s, the Dow held many more industrial and manufacturing stocks. Today it holds more healthcare and technology companies. When a company in the index declines or no longer represents its sector well, the Wall Street Journal's index committee votes to replace it.
How the Dow is calculated
The Dow is calculated by adding the price of all 30 stocks and dividing by a number called the "divisor." The divisor adjusts whenever a stock splits or when a company is replaced, so the index stays continuous even when the underlying stocks change. This is different from the S&P 500, which is weighted by market value (the total worth of all shares outstanding).
Because the Dow uses price weighting, a $1 move in a $300 stock has the same effect as a $1 move in a $100 stock. This can make the index less representative of overall market movement than cap-weighted indexes, but it remains widely followed because it has a long history and is simple to understand.
When and why the 30 stocks change
The Wall Street Journal's index committee meets regularly to review whether the 30 stocks still represent the economy well. A stock might be removed if the company shrinks significantly, if it no longer fits its sector, or if it becomes less liquid (harder to buy and sell in large quantities). Replacements are chosen to fill the gap and maintain sector balance.
Changes are rare. Sometimes years pass without any removal. When a change does happen, it is announced in advance, and the new stock is added on a specific date. The announcement itself can move the market, because funds that track the Dow must buy the new stock and sell the old one.
How the Dow compares to other major indexes
| Index | Number of Stocks | Weighting Method | What It Represents |
|---|---|---|---|
| Dow Jones Industrial Average | 30 | Price-weighted | Large U.S. companies across major sectors |
| S&P 500 | 500 | Market-cap weighted | Large and mid-size U.S. companies |
| Nasdaq-100 | 100 | Market-cap weighted | Large non-financial companies, mostly technology |
The S&P 500 is broader and includes mid-size companies alongside large ones. Because it is market-cap weighted, the largest companies (like Apple and Microsoft) have more influence on its movement. The Nasdaq-100 focuses on technology and growth stocks and excludes financial companies. All three indexes move together most of the time, but they can diverge when different sectors perform differently.
Why the Dow still matters despite its size
The Dow is smaller than the S&P 500 and less focused on technology than the Nasdaq-100, yet it remains one of the most quoted indexes in news and finance. This is partly because it has been published since 1896 and has a long historical record. It is also simple — 30 stocks are easier to follow than 500 or 3,000. Many investors and funds track it or use it as a benchmark.
The Dow's price weighting means it can behave differently from cap-weighted indexes during market swings. When high-priced stocks move sharply, the Dow can move more than the S&P 500 even if the S&P 500 has larger total market value. Understanding this difference helps explain why the three major indexes sometimes tell different stories about the same market day.
Frequently Asked Questions
Has the Dow always had 30 stocks?
No. The Dow started with 12 stocks in 1896. It grew to 20 stocks in 1916, then to 30 in 1928, where it has remained. The number 30 was chosen to represent a broad cross-section of the economy without becoming too unwieldy to calculate by hand.
Can I buy a fund that tracks the Dow?
Yes. Several exchange-traded funds (ETFs) and mutual funds track the Dow by holding all 30 stocks. The most widely used is the SPDR Dow Jones Industrial Average ETF (ticker: DIA). These funds charge fees, which vary by provider.
Why does the Dow use price weighting instead of market cap weighting?
Price weighting is the original method, used since 1896 when market cap weighting was impractical to calculate. The method has been kept for historical continuity and because it remains simple to understand. Most newer indexes use market cap weighting because it better reflects the true size of companies.
What happens to the Dow when a stock splits?
When a stock splits, its price drops but the number of shares increases. The Dow's divisor is adjusted so the index value stays the same on the day of the split. This keeps the index continuous and prevents artificial jumps caused by the split itself.
Is the Dow a good way to track the overall stock market?
The Dow is one way to track large-company performance, but it is only 30 stocks. The S&P 500 is broader and includes mid-size companies. For the widest view, the total U.S. stock market index (which includes thousands of stocks) is more representative. Your choice depends on what you want to measure.