The US30 is a price-weighted index, meaning higher-priced stocks have a disproportionate impact on its value.

Unlike modern market-cap-weighted indices, the Dow Jones Industrial Average (tracked via the US30 CFD) weights its members solely by share price. A stock trading at $500 moves the index five times more than a stock trading at $100, even if the latter company has a larger total market value. This century-old structural quirk creates unique volatility patterns that traders must navigate, as a single high-priced stock can swing the entire index.