Commission File No.: 001-08944 pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities and Exchange Act of 1934
Subject Company: United States Steel Corporation Commission File No.: 001-16811

This filing relates to the proposal made by Cleveland-Cliffs Inc. (“Cliffs”) to the board of directors of United States Steel Corporation (“U.S. Steel”) to acquire all of the outstanding shares of U.S. Steel.

The following are communications between Cliffs and U.S. Steel that were posted on Cliffs’ website on August 22, 2023.

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