$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 (2015-07-29), gaining 13.03%. The number of shares
that changed hands was 29,564,341, or about 3.6 times the average daily
volume in the stock.
The closing price was $20.04, amounting to a market cap of $2,920,000,000,
about -56.95% off the highest price in the last 12 months. The stock has
been trading at a range between $15.68 and $46.55.
X is in the Steel/Iron Ore industry, part of the Basic Industries sector.