Stock index futures added to declines on Wednesday after data showed new orders for long-lasting manufactured goods in June fell more sharply than expected.

S&P 500 futures were down 5.7 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 38 points, and Nasdaq 100 futures were off 7.5 points.

(Reporting by Leah Schnurr; Editing by Padraic Cassidy)