DEFINITION of 'Multiple Compression'

Multiple compression is the effect that arises when a stock sees its earnings increase, but the stock price doesn't move up (or even goes down). The result is that the given multiple (P/E ratio) is reduced even though nothing is fundamentally wrong with the company. Compression of a company's multiple can be interpreted as the valuation being called into question.

BREAKING DOWN 'Multiple Compression'

Remember, the multiple is based on many factors, but most importantly the future expectations of a company. If a company trades at say, a P/E multiple of 50, this means investors are paying $50 for each $1 of earnings. Generally, an investor would only pay such a high multiple on the expectation that the company will grow significantly faster than its competitors or the stock market in general.

When the company's growth rates start to slow, investors might start to doubt its growth prospects, and thus not pay an expensive a premium as they once did. In our case, the company might experience multiple compression with the P/E shrinking to 25, even though earnings haven't changed. With the same earnings of $1, this would mean that the stock price fell in half (25/50 = 1/2). This demonstrates how the stock price could go down when earnings stay the same.

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