Definitive Additional Materials





Washington, D.C. 20549


Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.   )

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United States Steel Corporation

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Commencing on April 12, 2012, United States Steel Corporation will begin making recorded telephone calls to certain of its stockholders containing the following text.

Hello. This is Gretchen Haggerty, Executive Vice President & Chief Financial Officer of United States Steel Corporation. I am calling to remind you that our annual meeting of stockholders will be held on April 24, 2012. If you have not already voted, we urge you to call 1-866-257-5415 and vote by phone. That’s 1-866-257-5415. Please have your proxy card with you. It contains your control number, which you need to cast your vote. You may also vote by following the instructions on your proxy card. Your vote is very important to us. We greatly appreciate your participation and support. Thank you.