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*** Exercise Your Right to Vote ***  Important Notice Regarding the Availability of Proxy Materials for the  Meeting of Stockholders to Be Held on April 23, 2019.  Meeting Information  MOBILE MINI, INC.  Meeting Type: Annual Meeting  For holders as of: February 22, 2019  Date: April 23, 2019 Time: 11:00 AM Local Time  Location:  Mobile Mini, Inc.  Mobile Mini Headquarters  4646 E. Van Buren Street  Phoenix, Arizona 85008   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  the more complete proxy materials that are available to  you on the Internet. You may view the proxy materials  online at 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.  MOBILE MINI, INC.  4646 E. VAN BUREN STREET  SUITE 400  PHOENIX, AZ 85008   E57890-P18692  See the reverse side of this notice to obtain  proxy materials and voting instructions. Before You Vote  How to Access the Proxy Materials  Proxy Materials Available to VIEW or RECEIVE:  NOTICE AND PROXY STATEMENT 2018 ANNUAL REPORT TO SHAREHOLDERS  How to View Online:  Have the information that is printed in the box marked by the arrow (located on the  following page) and visit:  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:   2) BY TELEPHONE: 1-800-579-1639   3) BY E-MAIL*:  * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked  by the arrow (located on the following page) in the subject line.  .  XXXX XXXX XXXX XXXX  .  XXXX XXXX XXXX XXXX  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 April 9, 2019 to facilitate timely delivery.  How To Vote  E57891-P18692  Please Choose One of the Following Voting Methods  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 Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions.     Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.  .  XXXX XXXX XXXX XXXX   Voting Items  The Board of Directors recommends you vote FOR  all of the following nominees:  The Board of Directors recommends you vote FOR  proposals 2 and 3.  1. Election of Directors   Nominees:   1a. Michael L. Watts  2. Ratify the selection of KPMG LLP as the  Company's Independent Registered Public  Accounting Firm for the year ending  December 31, 2019.   1b. Erik Olsson   1c. Sara R. Dial  3. Advisory vote to approve named executive officer  compensation.   1d. Jeffrey S. Goble  NOTE: When properly executed, this proxy will be voted  as directed. If no direction is given, the proxies will vote  for each of the listed nominees in proposal 1 and for  proposals 2 and 3. If any other matters properly come  before the meeting, the proxies will vote as the Board  may recommend.   1e. James J. Martell   1f. Stephen A McConnell   1g. Frederick G. McNamee, III   1h. Kimberly J. McWaters   1i. Lawrence Trachtenberg  E57892-P18692   1j. Michael W. Upchurch