The Standard and Poor's reference article from the English Wikipedia on 24-Apr-2004
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Standard and Poor's

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The Standard and Poor's Corporation (also: S&P), a subsidiary of McGraw-Hill, is a company that performs financial research and analysis. It is best known for its S&P 500 stock market index. The company also ranks the credit-worthiness of borrowers using a standardized ratings scale.

The basic ratings are:

Investment Grade

Non-Investment Ratings below BBB are non-investment grade junk bonds.

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