The S&P 500 index futures chopped around during Wednesday’s session, remaining influenced by ongoing headlines regarding Iran tensions and negotiations.

Overnight, index futures stayed in a relatively small range following Tuesday’s late pop. Volatility increased as the regular session approached, with bulls pushing slightly past the premarket high to a peak of 6684.75 shortly after the open. Gains evaporated quickly as sellers drove the index roughly 50 handles lower. Bulls fought back into chop before another flush broke the premarket low, bottoming at 6616.50, still holding green territory. Buyers rebounded swiftly, returning to mid-range before noon. 

Afternoon chop produced lower highs in the final two hours as sellers trimmed some gains. The session closed below the day’s midpoint at 6640.75, up 34.75 handles.

Thursday brings a few earnings reports in the morning and evening along with some fedspeak in the evening.

Among the top components of the index, Amazon.com Inc (NASDAQ: AMZN) stood out as the biggest gainer, climbing $4.47 or 2.16% to close at $211.71.

That performance was over three times better than the cash index’s 0.56% advance.

Conversely, Berkshire Hathaway Inc (NYSE: BRK.B) was the biggest loser, falling $3.14 or 0.66% to close at $476.19.