All three major U.S. stock index futures turned negative on Friday, adding losses after the government reported U.S. consumer prices were flat in July versus June, but fell over the past 12 months by the most since 1950.

S&P 500 futures were down 0.8 points, but above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures, which was flat before the data, were down 16 points, and Nasdaq 100 futures shed 8.25 points.

(Reporting by Angela Moon; editing by Jeffrey Benkoe)

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