In January, ProShares changed its silver and gold ETFs to track futures-based indexes. This marks the first time leveraged and inverse ETFs will benchmark to gold and silver futures prices. The silver and gold ETFs (ProShares Ultra Silver ( AGQ - Get Report) , ProShares UltraShort Silver ( ZSL - Get Report) , ProShares Ultra Gold ( UGL - Get Report) and ProShares UltraShort Gold ( GLL) ) are changing their benchmarks from the LBMA (London Bullion Market Association) silver and gold auction prices to Bloomberg Commodity Subindexes. So how did we get here? A number of factors drove ProShares to change the way it ... (full story)