EXHIBIT 99.1 NEWS RELEASE Cleveland-Cliffs Reports First-Quarter 2024 Results and Announces New 1.5BillionShareRepurchaseProgramDuringthefirstquarterof2024,theCompanyrepurchased30.4millionCLFcommonshares,fullyutilizingtheremainingbalanceof608 million under the previously authorized 1billionsharerepurchaseprogram.Theaveragestockpurchasepricefortheentireprogramwas18.79 per share. Following the completion of the program, the Cliffs Board of Directors has authorized a ...