ArcelorMittal posts loss, but results improve from Q4.

 ArcelorMittal (MT) posted a net loss of $345M or -$0.21 per share for Q1 on revenue of $19.752B, and while both figures were worse than Q1 2012, the results were an improvement over the previous quarter. CEO Lakshmi Mittal said the economic environment "remains challenging," but sounded upbeat about the company's performance in the face of a soft market. The world's largest steel maker said EBITDA (which, like the profit and revenue picture, improved slightly from Q4), should continue to improve sequentially and will likely come in above $7.1B for the full year.