Stock index futures extended losses on Wednesday after Commerce Department data showed new orders for long-lasting U.S. manufactured goods fell more than expected in April.

S&P 500 futures fell 3.8 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 21 points and Nasdaq 100 futures fell 1.5 points.

(Reporting by Chuck Mikolajczak; Editing by Kenneth Barry)