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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¨ Preliminary Proxy Statement

¨ Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to Section 240.14a-12

Mavenir Systems, 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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Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to be held on June 18, 2014, for Mavenir Systems, Inc.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. To view the proxy statement and annual report, go to www.proxydocs.com/mvnr. To submit your proxy while visiting this site, you will need the 12 digit control number in the box below. This is not a ballot and you cannot use this notice to vote your shares.Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper form. Proxy materials can be distributed by making them available on the Internet. We have chosen to use these procedures for our 2014 Annual Meeting and need YOUR participation.If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year’s annual meeting, please make this request on or before June 8, 2014.For a Convenient Way to VIEW Proxy MaterialsandVOTE Online go to: www.proxydocs.com/mvnr Proxy Materials Available to View or Receive:1. Proxy Statement 2. Annual Report Printed materials may be requested by one of the following methods: INTERNET www.investorelections.com/mvnr TELEPHONE (866) 648-8133E-MAIL paper@investorelections.com You must use the 12 digit control number located in the shaded gray box below. If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting material. ACCOUNT NO. SHARES Company Notice of Annual Meeting Date:Wednesday, June 18, 2014 Time:9:00 A.M. Central Time Place:Hyatt Regency North Dallas 701 East Campbell Road Richardson, Texas 75081 The purpose of the Annual Meeting is to take action on the following proposals: The Board of Directors recommends that you vote FOR the following. 1. Election of Class I Directors Nominees 01 Jeffrey P. McCarthy 02 Vivek Mehra The Board of Directors recommends that you vote “FOR” the following. 2. The rati cation of the appointment of BDO USA, LLP as our independent registered public accounting rm for the scal year ending December 31, 2014.