Stock futures added gains on Wednesday after results from major banks Morgan Stanley and Wells Fargo , while investors were buoyed by solid earnings and an outlook from technology giant Apple Inc .

S&P 500 futures gained 5.2 points and were above 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 added 15 points, and Nasdaq 100 futures advanced 15.5 points.

(Reporting by Leah Schnurr; editing by Jeffrey Benkoe)