ZSL - SPXU Drift Is Improving But It Is Still In Decay Regime December, 07 2020 03:52 PM ProShares UltraShort Silver Leveraged ETFs sometimes have an unpredictable behavior. An illustration with 22 ETFs tracking various indexes. A closer look at SPXU. For further details see: SPXU Drift Is Improving, But It Is Still In Decay Regime