U.S. Steel Corp., the country’s second-biggest producer of the metal by volume, reported better-than-expected third-quarter earnings and revenue after sales of flat-rolled steel quadrupled.

The company's shares jumped in regular trading Tuesday and climbed even more in extended trading. At about 6 p.m. in New York, the shares were 9.9 percent at $41.91, after jumping 5.1 percent during the regular session to close at $38.15.

U.S. Steel had a net loss of $1.42 per share, compared with a $12.38 loss a year earlier, the Pittsburgh-based company said in a statement Tuesday. Excluding charges related to the reorganization of Canadian operations and other one-time items, it had a per-share profit of $2.16, beating the $1.20 average of 14 analysts’ estimates compiled by Bloomberg.

Sales rose to $4.59 billion from $4.13 billion a year earlier, beating the $4.54 billion average estimate.

Chief Executive Officer Mario Longhi is working to streamline operations and restore earnings at U.S. Steel. The company has lost money for the last five years after global production climbed and imports damaged domestic steelmakers’ profitability.

The price of hot-rolled steel coil, a benchmark product used in cars and appliances, rose 3.9 percent to average $671 in the third quarter compared with a year earlier, according to data from The Steel Index.

In September, U.S. Steel said it would halt the expansion of iron production in Keewatin, Minnesota, stop building raw material capacity at its Gary Works plant in Indiana and put its Canadian subsidiary in court-supervised reorganization.