I didn't read the SEC filling. But there are 2 major kinds of ETFs: those which trying to accurately track the index and those which tracking daily movements (u

I didn't read the SEC filling. But there are 2 major kinds of ETFs: those which trying to accurately track the index and those which tracking daily movements (usually leveraged). Many ETFs tracking commodities are of the second type, so buy&hold investors will lose money by buying them.