S&P 500 index traded flat on Thursday as gains from China interest rate cut was offset by Fed's unwillingness to propose further easing. US benchmark gave up 0.01% or 0.14 points to 1,314.99. Regions Financial Group gained 2.4% after its stock was upgraded to outperform by Macquarie Group. Pall Corp. sank 4.3%. Filtration and separation products provider reported 3rd-quarter revenue that underperformed analysts' forecasts.