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THE NAVIGATORS GROUP, INC. ** IMPORTANT NOTICE ** Regarding the Availability of Proxy Materials You are receiving this communication because you hold shares in the above company, and the materials you should review before you cast your vote are now available. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. Shareholder Meeting to be held on 4/29/09 Proxy Materials Available • Notice and Proxy Statement • Annual Report PROXY MATERIALS — VIEW OR RECEIVE You can choose to view the materials online or receive a paper or e-mail copy. There is NO charge for requesting a copy. Requests, instructions and other inquiries will NOT be forwarded to your investment advisor. To facilitate timely delivery please make the request as instructed below on or before 4/15/09. HOW TO VIEW MATERIALS VIA THE INTERNET Have the 12 Digit Control Number available and visit: www.proxyvote.com HOW TO REQUEST A COPY OF MATERIALS 1) BY INTERNET — www.proxyvote.com 2) BY TELEPHONE — 1-800-579-1639 3) BY E-MAIL* — sendmaterial@proxyvote.com *If requesting materials by e-mail, please send a blank e-mail with the 12 Digit Control Number (located on the following page) in the subject line. See the Reverse Side for Meeting Information and Instructions on How to Vote B1NVG1

 

Meeting Information Meeting Type: Annual Meeting Date: 4/29/09 Meeting Time: 10:00 A.M. EDT For holders as of: 3/2/09 Meeting Location: Reckson Executive Park 6 International Drive Rye Brook, New York 10573 How To Vote Vote In Person Should you choose to vote these shares in person at the meeting you must request a “legal proxy.” To request a legal proxy please follow the instructions at www.proxyvote.com or request a paper copy of the materials. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. Vote By Internet To vote now by Internet, go to WWW.PROXYVOTE.COM. Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 P.M. Eastern Time the day before the cut-off date or meeting date. Have your notice in hand when you access the web site and follow the instructions. B1NVG2

 

Voting items 1. Election of Directors: Nominees — (1) H.J. Mervyn Blakeney (6) Leandro S. Galban, Jr. (2) Peter A. Cheney (7) John F. Kirby (3) Terence N. Deeks (8) Marc M. Tract (4) W. Thomas Forrester (9) Robert F. Wright (5) Stanley A. Galanski The Board of Directors Recommends a Vote FOR PROPOSAL 1. 2. Approval of an amendment to The Navigators Group, Inc. 2005 Stock Incentive Plan. The Board of Directors Recommends a Vote FOR PROPOSAL 2. 3. Ratification of the appointment of KPMG LLP as the Company’s independent registered public accounting firm for 2009. The Board of Directors Recommends a Vote FOR PROPOSAL 3. B1NVG3

 

Voting Instructions B1NVG4