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dow jones industrial average (djia), nasdaq 100, and s&p 500 index historical membership listing?
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dow jones: http://en.wikipedia.org/wiki/historical_components_of_the_dow_jones_industrial_average  nasdaq: http://en.wikipedia.org/wiki/nasdaq-100 (scroll down) s&p tricky. from what i can find, you need to be in harvard business school, a member of crsp, or have access to bloomberg's databases. s&p did have the info available years ago, but no longer that i can find.
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