Dow Jones Industrial Average

How it's calculated

The Dow is price-weighted, not market-cap-weighted. The 30 stock prices are summed and divided by a "Dow divisor" — a number adjusted over time to account for stock splits, spinoffs, and member changes so that those events don't artificially move the index.

This means a $400 stock has more impact on the Dow than a $40 stock, regardless of which company is bigger. UnitedHealth (high price) historically swings the Dow more than Microsoft (much larger but lower price). It's a quirky structure that other major indices abandoned long ago.

What stocks are in it

The 30 are chosen by S&P Dow Jones Indices, the operator. Selection isn't formulaic — it's a committee judgment about which large US companies represent broad sectors of the economy.

Recent membership has tilted toward tech and consumer brands: Apple, Microsoft, Visa, Goldman Sachs, Boeing, Caterpillar, Coca-Cola, McDonald's, Walmart, Johnson & Johnson, and others. Traditional industrials are no longer dominant despite the name; many original "industrial" members have been replaced with services and tech companies.

Why it persists despite limitations

The Dow has well-known structural problems compared to the S&P 500:

• Price-weighted is mathematically inferior to market-cap-weighted for representing the broader economy.
• 30 companies is far less diversified than 500.
• Selection by committee rather than rules introduces arbitrariness.

Despite this, the Dow remains widely cited because:

• Historical continuity. Charles Dow created it in 1896; it's the longest continuously published US index. Long history makes it valuable for historical comparisons.
• Media familiarity. "The Dow is up 200 points" is a standard headline. The S&P 500 is more accurate but less familiar to non-finance audiences.
• Inertia. Once an index is the cultural reference point, displacing it is hard.

Dow vs. S&P 500 in practice

The two often move similarly day-to-day but diverge over longer periods:

• The S&P 500 has produced higher long-run returns than the Dow over recent decades, partly because the S&P captures more of the high-performing tech sector earlier.
• During specific market regimes (value-led periods, defensive rotations), the Dow's mix of more mature industrial and consumer names sometimes outperforms.
• The Dow is more concentrated in high-priced stocks, exposing it to specific company moves more than the diversified S&P.

For investors, the practical answer is to use S&P 500 index funds for broad US equity exposure rather than Dow-specific products. The Dow's role is mostly as a financial-media reference point.

Dow milestones

A few notable thresholds (often celebrated as cultural events):

• 1,000 (1972) — first crossing.
• 5,000 (1995) — during the dot-com run-up.
• 10,000 (1999) — late dot-com era.
• 14,000 (2007) — pre-financial-crisis peak.
• 15,000 (2013) — recovery from the GFC.
• 20,000 (2017) — post-election rally.
• 30,000 (2020) — post-COVID stimulus rally.
• 40,000 (2024) — most recent major round number.

Each crossing tends to attract media attention out of proportion to its actual significance.