U.S. stock index futures pointed to a mostly lower open Friday amid earnings and after the advance read on second-quarter GDP came in well below expectations.

Chevron fell more than 1 percent in pre-market trade after reporting a diluted earnings loss of 78 cents a share for the second quarter, versus profit of 30 cents a share in the same quarter last year. On an adjusted basis, the firm posted earnings of 35 cents a share versus expectations of 32 cents.