Exhibit 99.1

Mavenir Systems Reports 2013 Fourth Quarter and Full Year Financial Results

Richardson, TX – February 20, 2014 – Mavenir Systems (NYSE: MVNR), today reported financial results for the fourth quarter and full year of 2013 and provided its outlook for the first quarter and full year of 2014.

Total revenue for the fourth quarter of 2013 was $27.1 million, an increase of 62% year-over-year. GAAP operating loss for the fourth quarter of 2013 was $(1.7) million, compared with $(5.6) million in the fourth quarter of 2012. Non-GAAP operating loss, which excludes stock-based compensation, foreign exchange gains or losses, depreciation and amortization, was $(0.1) million for the fourth quarter of 2013 versus $(3.4) million for the fourth quarter of 2012. GAAP net loss for the fourth quarter of 2013 was $(2.8) million, compared to $(6.5) million in the fourth quarter of 2012. Non-GAAP net loss for the fourth quarter of 2013 was $(1.6) million, compared with a loss of $(4.6) million in the fourth quarter of 2012.

GAAP gross profit margin was 58% in the quarter, compared to 56% in the fourth quarter of 2012. Non-GAAP gross profit margin was above the high end of the company’s guidance range, at 59% in the quarter, compared to 61% in the fourth quarter of 2012.

Net loss per share was $(0.22) for the fourth quarter of 2013 compared with $(4.87) for the fourth quarter of 2012. As outlined in the accompanying table entitled “Non-GAAP Net Loss Per Share” included in this press release, the non-GAAP net loss per share was $(0.08) for the fourth quarter of 2013 compared to $(0.26) for the fourth quarter of 2012.

Total revenue for the full year 2013 was $101.3 million, an increase of 37% year-over-year. GAAP operating loss was $(7.7) million in 2013, compared to $(14.6) million in 2012. Non-GAAP operating loss, which excludes stock-based compensation, depreciation and amortization, was $(2.1) million in 2013 compared to $(10.2) million in 2012. GAAP net loss for 2013 was $(15.3) million, compared to $(15.6) million in 2012. Non-GAAP net loss for 2013 was $(7.8) million, compared to a loss of $(11.8) million in 2012.

GAAP gross profit margin was 55% in 2013, compared to 59% in 2012. Non-GAAP gross profit margin was 56% in 2013, compared to 60% in 2012.

Net loss per share was $(3.57) in 2013 compared with $(12.09) in 2012. As outlined in the accompanying table entitled “Reconciliation of Non-GAAP Earnings Per Share” included in this press release, the non-GAAP net loss per share was $(0.42) in 2013 compared with $(0.66) in 2012.

A description of the non-GAAP calculations and reconciliation to comparable GAAP measures is provided in the accompanying table entitled “Reconciliation of GAAP Financial Measures to Non-GAAP Financial Measures.”

“Mavenir delivered a strong year with solid financial results, setting new quarterly and annual revenue records attributed in part, to the adoption of 4G LTE becoming more broad-based in 2013,” said Pardeep Kohli, president and chief executive officer, Mavenir Systems. “We are well positioned to capitalize on 4G LTE adoption and virtualization, two trends which will be key growth drivers for our business in 2014.”

Mavenir 2013 Business and Financial Highlights

Guidance

Mavenir is providing the following first quarter and full year 2014 guidance with respect to anticipated total revenue, non-GAAP gross margin, non-GAAP operating loss, non-GAAP net loss and non-GAAP net loss per share.

First quarter 2014

Full year 2014

Conference Call

Mavenir will discuss its fourth quarter 2013 results and its business outlook via teleconference today at 5:00 p.m. Eastern Time. To access this call, investors can dial the toll free number 1-855-302-8830 (domestic) or 1-330-871-6073 with the ID#53668165, or access a live webcast of the conference call at Mavenir’s website http://investor.mavenir.com.

A replay will be available following the call on Mavenir Systems’ Investor Relations website and for one week at the following numbers: (855) 859-2056 (domestic) or (404) 537-3406 (international) with ID# 53668165.

Non-GAAP Financial Measures & Definitions

In addition to disclosing financial results that are determined in accordance with U.S. GAAP, Mavenir discloses non-GAAP operating loss, non-GAAP net loss and non-GAAP net loss per share, which are non-GAAP financial measures, as supplemental measures. Non-GAAP operating loss represents operating loss before depreciation, amortization and stock-based compensation, which metric our prospectus dated November 6, 2013 referred to as adjusted EBITDA. Non-GAAP net loss represents non-GAAP operating loss after interest and taxes. Non-GAAP net loss per share represents non-GAAP net loss divided by our adjusted weighted average common shares outstanding, which assumes the conversion of preferred shares as of the beginning of the period. These measures are used by management to evaluate our business and management believes these measures may help investors evaluate the Company’s fundamental operational performance. Management believes these non-GAAP measures facilitate operating performance comparisons from period to period by excluding potential differences caused by variations in capital structures, tax position, depreciation, amortization, stock-based compensation expense and certain other expenses. These measures are not measures of our financial performance under U.S. GAAP and should not be considered in isolation or a substitute for net loss, operating loss or other performance measures as determined in accordance with U.S. GAAP. These measures should be read only in conjunction with our consolidated financial statements prepared in accordance with U.S. GAAP. Please refer to the accompanying tables entitled “Reconciliation of GAAP Financial Measures to Non-GAAP Financial Measures” and “Non-GAAP Net Loss Per Share” for a reconciliation of consolidated GAAP operating loss to non-GAAP operating loss, consolidated GAAP net loss to non-GAAP net loss.

In determining our guidance for the first quarter and full year of 2014 set forth in “Guidance,” we have chosen to use non-GAAP measures for all metrics other than revenue. The non-GAAP metrics exclude the effects of depreciation, amortization, foreign exchange gains or losses, and stock-based compensation. The effects of these two items are difficult to forecast in advance as they relate to future foreign exchange rates and future stock prices, which are subject to external factors that are difficult to predict. As a result, Mavenir does not give guidance on GAAP metrics other than revenue.

Forward-Looking Statements

Statements in this press release that are not purely historical facts constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include the statements under “2014 Outlook” above as well as statements regarding Mavenir’s expectations with respect to revenue, non-GAAP gross margin, non-GAAP operating loss, non-GAAP net loss and non-GAAP net loss per share, as well as statements about the migration to 4G technology and the adoption of virtualization technology by mobile service providers and Mavenir’s views about its market opportunity and key drivers of growth. Forward-looking statements can generally be identified by words such as “anticipates,” “may,” “can,” “believes,” “expects,” “projects,” “intends,” “likely,” “target,” “will,” “to be” and other expressions that are predictions or indicate future events, trends or prospects, although not all forward-looking statements contain these identifying words. These forward-looking statements

represent management’s current expectations and involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of Mavenir to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. Accordingly, investors should not place undue reliance on these forward-looking statements.

Factors that could cause actual results to differ materially from those indicated by the forward-looking statements include risks regarding the timing of the adoption of 4G by mobile service providers around the world; mobile service providers’ investment in next-generation communications technology; our ability to sell solutions to mobile service providers, particularly those serving large numbers of customers; the length and variability of the sales cycles for our solutions; actions taken by our competitors; our ability to negotiate acceptable financial terms with our mobile service provider customers; the performance of our solutions when implemented in mobile service provider networks; management’s ability to accurately forecast Mavenir’s financial results; the timing of revenues and the application of complex revenue recognition rules to such revenues; prolonged negative economic conditions in domestic and global markets; and other factors described in our filings with the Securities and Exchange Commission (“the SEC”), including under the caption “Risk Factors” and elsewhere in our prospectus filed with the SEC on November 7, 2013 as well as in Mavenir’s annual report to be filed on Form 10-K for the year ended December 31, 2013, and in Mavenir’s other SEC filings. There is no assurance that Mavenir’s expectations will be realized. If one or more of these risks or uncertainties materialize, or if Mavenir’s underlying assumptions prove incorrect, actual results may vary materially from those expected, estimated or projected. The statements in this press release are made as of the date of this press release, even though this press release is made available on Mavenir’s website or otherwise. Mavenir does not assume any obligation to update the forward-looking statements provided herein to reflect events that occur or circumstances that exist after the date on which the forward-looking statements were made, except as required by law.

About Mavenir™:

Mavenir™ (NYSE: MVNR) is a leading provider of software-based networking solutions that enable mobile service providers to deliver high-quality internet protocol (IP)-based voice, video, rich communication and enhanced messaging services to their subscribers globally. Mavenir’s mOne^® software platform has enabled leading mobile service providers to introduce the industry’s first live network deployment of Voice over LTE (VoLTE) and the industry’s first live deployment of next-generation Rich Communication Services 5.0 (RCS). Our solutions deliver next-generation services such as RCS, VoLTE and Voice over Wi-Fi (VoWi-Fi) over existing 2G and 3G networks and next-generation 4G LTE networks. www.mavenir.com

© 2014 Mavenir Systems, Inc. All rights reserved.

Mavenir Systems^®, mOne^®, AirMessenger^®, Mavenir™, mStore™ and mCloud™, Transforming Mobile Networks™, are trademarks of Mavenir Systems, Inc.

Mavenir Systems, Inc. and Subsidiaries

Consolidated Statements of Operations

(in thousands, except per share data)

(unaudited)

Mavenir Systems, Inc. and Subsidiaries

Consolidated Balance Sheets

(in thousands, except share and per share amounts)

(unaudited)

Mavenir Systems, Inc. and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

Mavenir Systems, Inc. and Subsidiaries

Revenue Metrics

(in thousands)

(unaudited)

Mavenir Systems, Inc. and Subsidiaries

Reconciliation of GAAP Financial Measures to Non-GAAP Financial Measures

(in thousands)

(unaudited)

Mavenir Systems, Inc. and Subsidiaries

Non-GAAP Net Loss Per Share

(all shares are weighted average outstanding for period presented)

( in thousands, except share and per share data)

(unaudited)