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Standard & Poor's 400 Stock Index (S&P 400)

Standard & Poor's 400 Stock Index (S&P 400) definition - business

Standard & Poor's 400 Stock Index (S&P 400)

A broad-based index of 400 industrial stock prices weighted on the basis of market value (stock price multiplied by shares outstanding). It includes listed and over-the-counter stock but is heavily influenced by the stock of large corporations. The index is based on a value of 10 during the period 1941-43.

The American Heritage® Dictionary of Business Terms Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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