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

Teck Resources Ltd Ordinary Sha (symbol: TCK) was one of the worst losers
of the trading day today (2016-03-23), losing -14.64%. The number of shares
that changed hands was 8,661,473, or about 1 times the average daily volume
in the stock.
The closing price was $7.29, amounting to a market cap of $4,200,000,000,
about -55.0% off the highest price in the last 12 months. The stock has
been trading at a range between $2.56 and $16.2.
TCK is in the Mining & Quarrying of Nonmetallic Minerals (No Fuels)
industry, part of the Basic Industries sector.