American Express, Medtronic, Google, Unum: U.S. Equity Movers

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The following companies are having unusual price changes in U.S. trading. Stock symbols are in parentheses, and share prices are as of 1:20 p.m. in New York.

Life insurers slumped after Fitch Ratings said the industry faces a ``significant'' risk of downgrades because of investment losses. The companies may have their ratings cut amid market volatility and because the firms sold retirement products linked to equities, Fitch said.