Related Clues:

• Standard partner
• Standard's partner
• Standard & ___
• The 'P' of the S&P 500
• The 'P' of 'S&P'
• Standard & ___ 500
• Half of a stock market index name
• Wall Street's Standard & __
• Standard & __
• Half of 55 Down
• Possessive on a stock index
• The "P" of SandP
• The "P" of S&P 500