Standard & Poor's has published a collection of data relevant to the 50th anniversary of the S&P 500 Index. Since 1957, 87 companies remain in the index since it was formulated in 1957.
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Source: Standard & Poor's
Additionally, S&P has included several articles that appeared in the first issue of the company's newsletter The Outlook. A featured company reviewed in the first issue is General Electric on page 4 of the link.