CLF raises_2021-EBIDTA_guidance—>$4.0B (from $3.5B)—1Q21 results in-line: http://www.clevelandcliffs.com/English/news-center/news-releases/news-releases-details/2021/Cleveland-Cliffs-Reports-First-Quarter-2021-Results-and-Increases-Guidance-for-Full-Year-2021-Adjusted-EBITDA-to-4-Billion/default.aspx