Vice President Kamala Harris sought to capitalize on the star power of Oprah Winfrey and a host of Hollywood celebrities to help her win over persuadable voters during an online rally Thursday night that ranged from participants’ searing accounts of personal loss and trauma to the Democrat’s unguarded remark about her own gun ownership.

Friday could see a surge in trading activity due to triple witch option expirations and S&P index rebalance trades, NYSE's Michael Reinking said.

U.S. stock index futures edged lower on Friday, pausing after the previous session's rally set Wall Street's main indexes on track for weekly gains following the Federal Reserve's pivotal stance on monetary policy earlier in the week.