S&P 500 stock index futures fell to a session low on Friday as mixed quarterly results from bellwethers General Electric , Bank of America and Google Inc spurred caution, a day after Wall Street capped a four-day run-up.

S&P 500 futures were 5.5 points lower 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 fell 6 points, and Nasdaq 100 futures fell 4.75 points.

(Reporting by Ellis Mnyandu; Editing by Theodore d'Afflisio)

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