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Array BioPharma Inc.


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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on October 25, 2018. ARRAY BIOPHARMA INC. You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of ARRAY BIOPHARMA INC. 3200 WALNUT STREET BOULDER, CO 80301 the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. proxy materials and voting instructions. E50595-P12933 See the reverse side of this notice to obtain Meeting Information Meeting Type:Annual Meeting For holders as of:August 29, 2018 Date: October 25, 2018Time: 1:00 PM MDT Location: 1825 33rd Street Boulder, Colorado 80301


Before You Vote How to Access the Proxy Materials Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. E50596-P12933 Vote In Person: Many stockholder 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. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. Proxy Materials Available to VIEW or RECEIVE: ANNUAL REPORTNOTICE AND PROXY STATEMENT How to View Online: following page) and visit: www.proxyvote .com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 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 information that is printed in the box marked Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before October 11, 2018 to facilitate timely delivery.


1. Election of two Class III directors to serve for a three-year term of office expiring at the 2021 Annual Meeting of Stockholders. Nominees: 1a. Charles M. Baum, M.D., Ph.D. 1b. Gwen Fyfe, M.D. 2. Amendment of our Amended and Restated Certificate of Incorporation to increase the authorized shares of common stock from 280,000,000 to 340,000,000. 3. Advisory vote to approve the compensation of our named executive officers as disclosed in the accompanying Proxy Statement. 4. Ratification of the appointment of KPMG LLP as our independent registered public accountants for the fiscal year ending June 30, 2019. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. The Board of Directors recommends a vote "For" all directors nominated for re-election and a vote "For" all other proposals. E50597-P12933 Voting Items