Nippon Steel & USS Acquisition Overview

Additional Information and Where to Find It This presentation relates to the proposed transaction between the United States Steel Corporation ("U. S. Steel”) and NSC. In connection with the proposed transaction, U. S. Steel will file relevant materials with the United States Securities and Exchange Commission ("SEC"), including U. S. Steel's proxy statement on Schedule 14A (the "Proxy Statement"). The information in the preliminary Proxy Statement will not be complete and may be changed. The definitive Proxy Statement will be delivered to stockholders of U. S. Steel. U. S. Steel may also file other documents with the SEC regarding the proposed transaction. This presentation is not a substitute for the Proxy Statement or for any other document that may be filed with the SEC in connection with the proposed transaction. The proposed transaction will be submitted to U. S. Steel's stockholders for their consideration. BEFORE MAKING ANY VOTING DECISION, U. S. STEEL'S STOCKHOLDERS ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC, INCLUDING THE PROXY STATEMENT, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT U. S. STEEL, NSC AND THE PROPOSED TRANSACTION. U. S. Steel's stockholders will be able to obtain free copies of the preliminary Proxy Statement and the definitive Proxy Statement (in each case, if and when available), as well as other documents containing important information about U. S. Steel, NSC and the proposed transaction once such documents are filed with the SEC, without charge, at the SEC's website (www.sec.gov). Copies of the Proxy Statement and the other documents filed with the SEC by U. S. Steel can also be obtained, without charge, by directing a request to United States Steel Corporation, 600 Grant Street, Pittsburgh, Pennsylvania 15219, Attention: Corporate Secretary; telephone 412-433-1121, or from U. S. Steel's website www.ussteel.com. NIPPON STEEL USS United States Steel Corporation 22 22

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