Exhibit 99.1

CISCO REPORTS THIRD QUARTER EARNINGS

SAN JOSE, Calif. — May 16, 2018 — Cisco today reported third quarter results for the period ended April 28, 2018. Cisco reported third quarter revenue of $12.5 billion, net income on a generally accepted accounting principles (GAAP) basis of $2.7 billion or $0.56 per share, and non-GAAP net income of $3.2 billion or $0.66 per share.

“We are executing well against our strategy, our innovation pipeline has never been stronger, and we continue to make great progress in transforming towards more software and subscriptions,” said Chuck Robbins, Chairman and CEO, Cisco. “I am confident with our position in the industry and the impact we will continue to drive with our customers.”

GAAP Results

Reconciliations between net income, EPS, and other measures on a GAAP and non-GAAP basis are provided in the tables located in the section entitled “Reconciliations of GAAP to non-GAAP Measures.”

“We delivered strong results in Q3 with solid revenue growth of 4% and non-GAAP EPS growth of 10%, said Kelly Kramer, CFO of Cisco. Our investment in innovation and continued execution are paying off. We saw broad-based strength across our portfolio, while continuing to shift our business model and deliver value for shareholders.”

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Financial Summary

All comparative percentages are on a year-over-year basis unless otherwise noted.

Q3 FY 2018 Highlights

Revenue — Total revenue was $12.5 billion, up 4%, with product revenue up 5% and service revenue up 3%. 32% of total revenue was from recurring offers, up 2 percentage points from the third quarter of fiscal 2017. Revenue by geographic segment was: Americas up 2%, EMEA up 9%, and APJC up 7%. Product revenue performance was broad based with growth in Infrastructure Platforms which increased by 2%, Applications which increased by 19%, and Security which increased by 11%.

Gross Margin — On a GAAP basis, total gross margin and product gross margin were 62.3% and 61.0%, respectively. Product gross margin decreased compared with 61.7% in the third quarter of fiscal 2017.

Non-GAAP total gross margin and product gross margin were 63.9% and 62.9%, respectively. Non-GAAP product gross margin decreased compared with 63.2% in the third quarter of fiscal 2017. The decrease was primarily due to pricing and higher memory costs partially offset by improved productivity benefits.

GAAP service gross margin was 65.8% and non-GAAP service gross margin was 66.9%.

Total gross margins by geographic segment were: 64.4% for the Americas, 64.3% for EMEA and 61.7% for APJC.

Operating Expenses — On a GAAP basis, operating expenses were $4.6 billion, up 6%. Non-GAAP operating expenses were $4.0 billion, up 6%, and were 32.5% of revenue.

Operating Income — GAAP operating income was $3.1 billion, down 1%, with GAAP operating margin of 25.1%. Non-GAAP operating income was $3.9 billion, up 2%, with non-GAAP operating margin of 31.5%.

Provision for Income Taxes — The GAAP tax provision rate was 17.3%. The non-GAAP tax provision rate was 21.0%.

Net Income and EPS — On a GAAP basis, net income was $2.7 billion and EPS was $0.56. On a non-GAAP basis, net income was $3.2 billion, an increase of 6%, and EPS was $0.66, an increase of 10%.

Cash Flow from Operating Activities — was $2.4 billion, a decrease of 28% compared with $3.4 billion for the third quarter of fiscal 2017. Operating cash flow includes the payment of $1.3 billion of one-time foreign taxes as related to the Tax Cuts and Jobs Act. Operating cash flow increased 11%, normalized for these tax payments.

Balance Sheet and Other Financial Highlights

Cash and Cash Equivalents and Investments — were $54.4 billion at the end of the third quarter of fiscal 2018, compared with $73.7 billion at the end of the second quarter of fiscal 2018, and compared with $70.5 billion at the end of fiscal 2017. The total cash and cash equivalents and investments available in the United States at the end of the third quarter of fiscal 2018 were $47.5 billion.

Deferred Revenue — was $19.0 billion, up 9% in total, with deferred product revenue up 18%, driven largely by subscription-based and software offers, and deferred service revenue was up 4%. The portion of deferred product revenue related to recurring software and subscription offers increased 29%.

Capital Allocation — In the third quarter of fiscal 2018, Cisco declared and paid a cash dividend of $0.33 per common share, or $1.6 billion. For the third quarter of fiscal 2018, Cisco repurchased approximately 140 million shares of common stock under its stock repurchase program at an average price of $42.83 per share for an aggregate purchase price of $6.0 billion. The remaining authorized amount for stock repurchases under the program is $25.1 billion with no termination date.

Acquisitions and Divestitures

On May 1, 2018, we announced our intent to acquire Accompany, a privately held company that provides an AI-driven relationship intelligence platform. The Accompany acquisition closed in the fourth quarter of fiscal 2018. We also announced an agreement to sell our Service Provider Video Software Solutions (SPVSS) business. We expect this transaction to close in the first quarter of fiscal 2019 subject to regulatory approvals and customary closing conditions.

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In the third quarter of 2018, we closed our acquisition of BroadSoft, Inc., a publicly held company that offers cloud calling and contact center solutions. We also closed our acquisition of Skyport Systems, Inc., a privately held company providing cloud-managed, hyper-converged systems that run and protect business critical applications.

Guidance for Q4 FY 2018

Cisco expects to achieve the following results for the fourth quarter of fiscal 2018:

Cisco estimates that GAAP EPS will be $0.55 to $0.60 in the fourth quarter of fiscal 2018.

A reconciliation between the Guidance for Q4 FY 2018 on a GAAP and non-GAAP basis is provided in the table entitled “GAAP to non-GAAP Guidance for Q4 FY 2018” located in the section entitled “Reconciliations of GAAP to non-GAAP Measures.”

Editor’s Notes:

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CISCO SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per-share amounts)

(Unaudited)

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CISCO SYSTEMS, INC.

REVENUE BY SEGMENT

(In millions, except percentages)

CISCO SYSTEMS, INC.

GROSS MARGIN PERCENTAGE BY SEGMENT

(In percentages)

CISCO SYSTEMS, INC.

REVENUE FOR GROUPS OF SIMILAR PRODUCTS AND SERVICES

(In millions, except percentages)

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CISCO SYSTEMS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions)

(Unaudited)

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CISCO SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

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CISCO SYSTEMS, INC.

DEFERRED REVENUE

(In millions)

CISCO SYSTEMS, INC.

DIVIDENDS PAID AND REPURCHASES OF COMMON STOCK

(In millions, except per-share amounts)

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

GAAP NET INCOME (LOSS) TO NON-GAAP NET INCOME

(In millions, except per-share amounts)

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

GROSS MARGINS, OPERATING EXPENSES, OPERATING MARGINS, AND NET INCOME

(In millions, except percentages)

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

GROSS MARGINS, OPERATING EXPENSES, OPERATING MARGINS, AND NET INCOME (LOSS)

(In millions, except percentages)

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CISCO SYSTEMS, INC.

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

EFFECTIVE TAX RATE

(In percentages)

GAAP TO NON-GAAP GUIDANCE FOR Q4 FY 2018

Except as noted above, this guidance does not include the effects of any future acquisitions/divestitures, asset impairments, restructurings and significant tax matters or other events, which may or may not be significant unless specifically stated.

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Forward Looking Statements, Non-GAAP Information and Additional Information

This release may be deemed to contain forward-looking statements, which are subject to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among other things, statements regarding future events (such as execution on our strategy, our investment in innovation and ability to continue to build a strong innovation pipeline, continued progress in transforming our business toward more software and subscriptions, our ability to maintain our position in the industry and the impact we will continue to drive with our customers, continued broad-based strength across our portfolio, and our ability to continue to execute well, deliver profitable growth and return capital to our shareholders) and the future financial performance of Cisco (including the guidance for Q4 FY 2018) that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results due to a variety of factors, including: business and economic conditions and growth trends in the networking industry, our customer markets and various geographic regions; global economic conditions and uncertainties in the geopolitical environment; overall information technology spending; the growth and evolution of the Internet and levels of capital spending on Internet-based systems; variations in customer demand for products and services, including sales to the service provider market and other customer markets; the return on our investments in certain priorities, key growth areas, and in certain geographical locations, as well as maintaining leadership in routing, switching and services; the timing of orders and manufacturing and customer lead times; changes in customer order patterns or customer mix; insufficient, excess or obsolete inventory; variability of component costs; variations in sales channels, product costs or mix of products sold; our ability to successfully acquire businesses and technologies and to successfully integrate and operate these acquired businesses and technologies; our ability to achieve expected benefits of our partnerships; increased competition in our product and service markets, including the data center market; dependence on the introduction and market acceptance of new product offerings and standards; rapid technological and market change; manufacturing and sourcing risks; product defects and returns; litigation involving patents, intellectual property, antitrust, shareholder and other matters, and governmental investigations; our ability to achieve the benefits of the announced restructuring and possible changes in the size and timing of the related charges; man-made problems such as cyber-attacks, data protection breaches, computer viruses or terrorism; natural catastrophic events; a pandemic or epidemic; our ability to achieve the benefits anticipated from our investments in sales, engineering, service, marketing and manufacturing activities; our ability to recruit and retain key personnel; our ability to manage financial risk, and to manage expenses during economic downturns; risks related to the global nature of our operations, including our operations in emerging markets; currency fluctuations and other international factors; changes in provision for income taxes, including changes in tax laws and regulations or adverse outcomes resulting from examinations of our income tax returns; potential volatility in operating results; and other factors listed in Cisco’s most recent reports on Forms 10-Q and 10-K filed on February 20, 2018 and September 7, 2017, respectively. The financial information contained in this release should be read in conjunction with the consolidated financial statements and notes thereto included in Cisco’s most recent reports on Forms 10-Q and 10-K as each may be amended from time to time. Cisco’s results of operations for the three and nine months ended April 28, 2018 are not necessarily indicative of Cisco’s operating results for any future periods. Any projections in this release are based on limited information currently available to Cisco, which is subject to change. Although any such projections and the factors influencing them will likely change, Cisco will not necessarily update the information, since Cisco will only provide guidance at certain points during the year. Such information speaks only as of the date of this release.

This release includes non-GAAP net income, non-GAAP gross margins, non-GAAP operating expenses, non-GAAP operating income and margin, non-GAAP effective tax rates, and non-GAAP net income per share data for the periods presented. It also includes future estimated ranges for gross margin, operating margin, tax provision rate and EPS on a non-GAAP basis.

These non-GAAP measures are not in accordance with, or an alternative for, measures prepared in accordance with generally accepted accounting principles and may be different from non-GAAP measures used by other companies. In addition, these non-GAAP measures are not based on any comprehensive set of accounting rules or principles. Cisco believes that non-GAAP measures have limitations in that they do not reflect all of the amounts associated with Cisco’s results of operations as determined in accordance with GAAP and that these measures should only be used to evaluate Cisco’s results of operations in conjunction with the corresponding GAAP measures.

Cisco believes that the presentation of non-GAAP measures when shown in conjunction with the corresponding GAAP measures, provides useful information to investors and management regarding financial and business trends relating to its financial condition and its historical and projected results of operations.

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For its internal budgeting process, Cisco’s management uses financial statements that do not include, when applicable, share-based compensation expense, amortization of acquisition-related intangible assets, acquisition-related/divestiture costs, significant asset impairments and restructurings, significant litigation settlements and other contingencies, significant gains and losses on investments, the income tax effects of the foregoing and significant tax matters. Cisco’s management also uses the foregoing non-GAAP measures, in addition to the corresponding GAAP measures, in reviewing the financial results of Cisco. In prior periods, Cisco has excluded other items that it no longer excludes for purposes of its non-GAAP financial measures. From time to time in the future there may be other items that Cisco may exclude for purposes of its internal budgeting process and in reviewing its financial results. For additional information on the items excluded by Cisco from one or more of its non-GAAP financial measures, refer to the Form 8-K regarding this release furnished today to the Securities and Exchange Commission.

About Cisco

Cisco (NASDAQ: CSCO) is the worldwide technology leader that has been making the Internet work since 1984. Our people, products and partners help society securely connect and seize tomorrow’s digital opportunity today. Discover more at thenetwork.cisco.com and follow us on Twitter at @Cisco.

Copyright ^© 2018 Cisco and/or its affiliates. All rights reserved. Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to: www.cisco.com/go/trademarks. Third-party trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. This document is Cisco Public Information.

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