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Information likely to affect a stock's price. Examples include mergers and acquisitions, information on earnings over the most recent quarter or year, or announcements of regulatory changes. If material news is particularly good or bad, it can cause large fluctuations in the stock's price, increasing its volatility. For this reason, publicly-traded companies usually hint about what material news will say before they actually announce it. This allows the market to absorb the information gradually so as to reduce pressure for volatility. Material news is also called material information. See also: Priced out.