CLEVELAND-CLIFFS INC.

Securities Trading Arrangements. During the quarter ended March 31, 2026, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of the Company adopted orterminated a "Rule 10b5-1 trading arrangement" or a "non-Rule 10b5-1 trading arrangement" (as each term is defined in Item 408 of Regulation S-K).

Supplemental Mine Safety Reporting. The following information is included for the purpose of providing disclosure under "Item 1.04 Mine Safety - Reporting of Shutdowns and Patterns of Violations" of Form 8-K. Section 1503(b)(1) of the Dodd-Frank Act requires the disclosure of the receipt of an imminent danger order (an "Order") under Section 107(a) of the Federal Mine Safety and Health Act of 1977 issued by the Mine Safety and Health Administration ("MSHA"). On April 18, 2026, Tilden Mining Company L.C., an indirect wholly-owned subsidiary of Cliffs ("Tilden"), received an Order from MSHA at Tilden's operations in Michigan regarding an employee observed working from a raised bucket of a Tilden vehicle without adequate fall protection. MSHA also observed that a safety chain within the bucket was not latched while the employee was working. Subsequent to issuance of the oral Order, the employee returned to the ground. The condition cited in the Order did not result in an accident or injury and did not adversely impact Tilden's operations at the mine.