Definition 1.
A unit of McGraw-Hill, S&P is an investment advisory service that performs several important functions, including maintaining the S&P 500, one of the most widely followed benchmarks of stock market performance. S&P is also one of the most important bond rating agencies, maintains several other stock indexes, and sells a variety of financial data about publicly traded companies. Its Stock Guide is a ubiquitous directory of publicly traded companies and basic information about them. It also publishes reports on companies and an investment newsletter.
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