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

United States Steel Corporation (symbol: X) was one of the worst losers of
the trading day today (2015-11-20), losing -9.66%. The number of shares
that changed hands was 18,505,618, or about 2 times the average daily
volume in the stock.
The closing price was $8.7, amounting to a market cap of $1,270,000,000,
about -76.1% off the highest price in the last 12 months. The stock has
been trading at a range between $8.63 and $36.4.
X is in the Steel/Iron Ore industry, part of the Basic Industries sector.