Stock index futures held gains on Thursday after reports on weekly jobless claims and first-quarter non-farm productivity.

S&P 500 futures rose 4.4 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 gained 28 points, and Nasdaq 100 futures added 4.5 points.

(Reporting by Chuck Mikolajczak; editing by Jeffrey Benkoe)