Source statesville.com As it stands, Boeing currently makes up 4.7% of the Dow. Industrials are the second-largest sector in the index right now, with 17.8% of the total allocation. Tech is larger by 3 percentage points. Buying an index fund that tracks the Dow, such as the SPDR Dow Jones Industrial Average ETF Trust (NYSEMKT: DIA), provides diversified exposure, but not nearly to the same degree as other popular indexes.
The Dow zigs where others zag, and its index weighting is based on share prices for each constituent stock. That means that stock splits can drastically alter the composition without changing the value of underlying companies. It also means that smaller companies can have a larger influence on index returns, simply because their price per share is high.
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