Stock index futures extended declines on Tuesday after results from Goldman Sachs added to earlier pressure as revenues from International Business Machines and Texas Instruments missed expectations.

S&P 500 futures dropped 11.8 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 lost 74 points, and Nasdaq 100 futures fell 16.5 points.

(Reporting by Leah Schnurr; editing by Jeffrey Benkoe)