Company: United States Steel Corporation

(Reuters) - Shares in U.S. steelmakers fell on Wednesday and analysts said it was likely related to a major iron-ore producer warning that commodity markets could cool further amid the Euro zone crisis and uncertainty over the global economy.

Stocks trimmed their losses but still ended in the red Monday, with the S&P 500 down almost 4 percent from its 2012 highs, weighed by political and economic worries in the euro zone.

Stocks eased off their worst levels but still finished lower Wednesday, led by materials and energy, amid worries over weakness overseas.

Stocks finished in negative territory Tuesday amid worries over China's economic outlook and as investors took a breather following the recent market rally.

Stocks eased off their best levels in the final minutes of trading Monday but still managed to eke out a small gain, following a sharp rally from the previous week.

U.S. Steel posted a wider-than-expected quarterly loss, hurt by falling steel prices and weak demand in Europe, but it said it expects improvement in the first quarter.