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

United States Steel Corporation (symbol: X) was one of the biggest winners
of the trading day today (2015-08-27), gaining 15.68%. The number of shares
that changed hands was 18,544,364, or about 1.9 times the average daily
volume in the stock.
The closing price was $16.89, amounting to a market cap of $2,470,000,000,
about -63.72% off the highest price in the last 12 months. The stock has
been trading at a range between $14.19 and $46.55.
X is in the Steel/Iron Ore industry, part of the Basic Industries sector.