Nippon Steel & USS Acquisition Overview

USS's State-of-the-Art Mini-Mill • EAF :2(3.3Mt/Y) • RH Degasser:1 • Big River Steel CSP (Compact Strip Process) :1 Compact Hot Mill:1 Galvanizing line :1 (525kt/Y) Big River 2 • EAF :2(3Mt/Y) • ESP (Endless casting & rolling line ) :1 . Galvanizing line :2(1mt/Y) • • 62% of project execution has been completed* . Non-grain oriented electrical steel line :1 (200kt/Y) • 92% of project spend has been committed * * • • Under construction Production to start in the second half of 2024; full financial contribution by 2026* Galv/galvalume :1 (325kt/Y) O Paint line :1 (165kt/Y) Note: Tons data is in net tons Location: Osceola, Arkansas GHG emissions intensity: 0.4t- CO2/t-steel (Scope 1 & 2) 250MW Driver solar field will add renewable power to BRS EAF electrical supply *As of USS Q3 2023 earnings call NIPPON STEEL USS United States Steel Corporation 10 10

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