$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 (2016-01-27), losing -14.16%. The number of shares
that changed hands was 22,069,883, or about 2 times the average daily
volume in the stock.
The closing price was $6.67, amounting to a market cap of $975,640,000,
about -75.9% off the highest price in the last 12 months. The stock has
been trading at a range between $6.43 and $27.68.
X is in the Steel/Iron Ore industry, part of the Basic Industries sector.