Twilio rises after Stifel upgrades to Buy

Venezuela said to weigh OPEC exit after more than 6 decades

Stock market today: Dow, S&P 500, Nasdaq futures hold steady as the focus turns to Kevin Warsh's Jackson Hole speech

Europe indexes rise as investors await Warsh’s Jackson Hole speech

Fundstrat’s Tom Lee remains bullish on Nvidia, seeing it as inexpensive