Digi International (DGII) DEFA14A Additional proxy soliciting materials

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.     )

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DIGI INTERNATIONAL INC.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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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 January 29, 2020 DIGI INTERNATIONAL INC. You are receiving this communication because you hold shares in the above named company. 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 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. DIGI INTERNATIONAL INC. ATTN: OFFICE OF GENERAL COUNSEL 9350 EXCELSIOR BLVD. HOPKINS, MN 55343 0000434015_1 R1.0.1.18 See the reverse side of this notice to obtain proxy materials and voting instructions. Meeting Information Meeting Type: Annual Meeting For holders as of: December 04, 2019 Date: January 29, 2020Time: 3:30 PM CST Location: Digi International Inc. 9350 Excelsior Blvd. Hopkins, MN 55343

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE:  Have the information that is printed in the box marked by the arrow (located on the  by the arrow (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods possession  available and follow the instructions. marked by the arrow 0000434015_2 R1.0.1.18 Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any specia 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. l 1. Notice & Proxy Statement2. Annual Report 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 January 15, 2020 to facilitate timely delivery.

The Board of Directors recommends you vote FOR each of the following Nominees: 1. Election of Directors Nominees 1a. Satbir Khanuja, Ph.D. 1b. Ronald E. Konezny The Board of Directors recommends you vote FOR proposals 2, 3, 4 and 5. 2. Company proposal to approve, on a non-binding advisory basis, the compensation paid to named executive officers. 3. Ratification of the appointment of Grant Thornton LLP as independent registered public accounting firm of the company for the 2020 fiscal year. 4. Company proposal to approve the Digi International Inc. 2020 Omnibus Incentive Plan. 5. Company proposal to approve the Amended and Restated Digi International Inc. Employee Stock Purchase Plan. NOTE: If any other matters properly come before the annual meeting calling for a vote of stockholders, the shares represented by this proxy will be voted by the persons named herein in accordance with their best judgment. 0000434015_3 R1.0.1.18 Voting items

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