Stock index futures added to losses on Thursday after weekly jobless claims and January producer price inflation data.

S&P 500 futures fell 4.6 points and were below 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 dipped 39 points, and Nasdaq 100 futures reversed gains, to fall 2.8 points.

(Reporting by Angela Moon; Editing by Theodore d'Afflisio)

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