A wildly popular oil ETF has been cut off by its broker from buying futures, limiting its ability to meet its investment objective (USO)

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• USO — an oil exchange-traded fund that's wildly popular with traders — has been cut off from buying oil futures contracts after a surge in volatility saw oil prices turn negative last month.
• RBC Capital Markets has informed United States Com…

  A wildly popular oil ETF has been cut off by its broker from buying futures,...