$SLCA is one of biggest losers #stocks today. read more:

U.S. Silica Holdings, Inc. Comm (symbol: SLCA) was one of the worst losers
of the trading day today (2016-07-25), losing -7.01%. The number of shares
that changed hands was 2,720,384, or about 1 times the average daily volume
in the stock.
The closing price was $33.94, amounting to a market cap of $2,160,000,000,
about -8.71% off the highest price in the last 12 months. The stock has
been trading at a range between $13.48 and $37.18.
SLCA is in the Mining & Quarrying of Nonmetallic Minerals (No Fuels)
industry, part of the Basic Industries sector. It first went public in 2012.