Futures for the Nasdaq 100 briefly turned negative on Thursday ahead of major earnings results, with Greek credit default swap hitting record highs prompting investors to trade cautiously.

At 1124 GMT (6:24 a.m. EST), futures for the Nasdaq 100 were up 0.2 percent after falling earlier in the day. Futures for the Dow Jones futures were up 0.2 percent, while the S&P 500 futures rose 0.3 percent.

The cost of insuring Greek government debt against default rose to a record high of 395,000 euros per 10 million euros of exposure, according to five-year credit default swap prices from CMA DataVision.

Investors awaited results from major companies such as Microsoft (MSFT.O), Amazon.com (AMZN.O), Procter & Gamble (PG.N), 3M (MMM.N), AT&T (T.N), Colgate-Palmolive (CL.N), Ford (F.N) and Motorola (MOT.N).

U.S. stocks rose on Wednesday after the Federal Reserve pledged to keep interest rates near zero, and stock futures rose after President Barack Obama struck a conciliatory tone on banks in his State of the Union speech.