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ProShares UltraShort Silver (ZSL) May volatility elevated at 133; silver down 6% May 12, 2011 10:45AM
Stocks with implied volatility movement; SLV ZSL May 6, 2011 06:52AM
ProShares UltraShort Silver (ZSL) volatility spikes as silver sell off 7% May 5, 2011 11:35AM