CATERPILLAR INC — Proxy Solicitation & Information Statement 2010

May 18, 2010

DEFA14A 1 reminder_051810.htm 05/18/2010 REMINDER LETTER SENT TO SHAREHOLDERS reminder_051810.htm Licensed to: Caterpillar Inc. Document Created using EDGARizer 5.1.5.0 Copyright 1995 - 2009 Thomson Reuters. All rights reserved.

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100 NE Adams Street

Peoria, Illinois 61629

May 18, 2010

Dear Caterpillar Stockholder:

According to our most recent records, we have not yet received your proxy for the Annual Meeting of Stockholders of Caterpillar Inc. to be held on June 9, 2010. Your Board of Directors recommends that you vote FOR proposals 1-5 and AGAINST proposals 6-8 .

Please help your company avoid the expense of further solicitation – vote your proxy TODAY by telephone , via the Internet, or by signing and returning the enclosed proxy card.

Even if you believe you have already voted, we encourage you to vote now to ensure your vote has been validly cast and is counted at the meeting. Your vote will only be counted once.

Thank you for your participation.

Very truly yours,

/s/ James B. Buda

James B. Buda

Vice President, General Counsel and Secretary

IMPORTANT NOTE: Remember, you can vote by telephone or via the Internet -- Simply follow the easy instructions on the enclosed proxy or voting instruction card. If you have any questions, or need assistance voting your shares, please call our proxy solicitor, INNISFREE M&A INCORPORATED TOLL-FREE, at 1-877-687-1865.