Exhibit 99.1

RingCentral Announces Third Quarter 2018 Results

Total Revenue up 33%

Mid-market and Enterprise ARR up 75%

Enterprise ARR up over 100%

Belmont, Calif. – November 5, 2018 – RingCentral, Inc. (NYSE: RNG), a leading provider of global enterprise cloud communications and collaboration solutions, today announced financial results for the third quarter ended September 30, 2018.

Third Quarter Financial Highlights

“Third quarter results were excellent. Our mid-market and enterprise businesses continue to lead the way supported by momentum from our channel partners.” said Vlad Shmunis, RingCentral’s founder, chairman and CEO. “With our relentless focus on innovation, through R&D investments and strategic acquisitions, we continue to expand our product portfolio and extend our lead in cloud communications. We believe we are well positioned to achieve our goal of exceeding $1 billion in revenue in 2020.”

New Accounting Standard

The Company adopted the new standard related to revenue recognition (Topic 606) effective January 1, 2018. The financial information in this press release is prepared in accordance with Topic 606, and the comparison period amounts used to calculate growth rates are based on amounts that have been adjusted from previously reported amounts to conform to the requirements of Topic 606.

Financial Results for the Third Quarter 2018

Recent Highlights

Financial Outlook

Full Year 2018 Guidance:

Fourth Quarter 2018 Guidance:

For a reconciliation of our forecasted non-GAAP operating margin, see “Reconciliation of Forecasted Operating Margin GAAP Measures to Non-GAAP Measures.” We have not reconciled our forecasted non-GAAP EPS to GAAP EPS because we do not provide guidance on it. We do not provide guidance on forecasted GAAP EPS because of the inherent uncertainty and complexity involved in forecasting the intercompany remeasurement gain (loss), which could be a significant reconciling item between the non-GAAP and respective GAAP measure. The intercompany remeasurement gain (loss) is affected by the movement in various exchange rates relative to the US Dollar, which is difficult to predict and subject to constant change. Accordingly, a reconciliation of the non-GAAP financial measure guidance to the corresponding GAAP measure is not available without unreasonable effort.

Conference Call Details:

Investor Presentation Details

An investor presentation providing additional information and analysis can be found at http://ir.ringcentral.com/.

About RingCentral

RingCentral, Inc. (NYSE: RNG) is a leading provider of global enterprise cloud communications and collaboration solutions. More flexible and cost-effective than legacy on-premises systems, RingCentral empowers today’s mobile and distributed workforce to communicate, collaborate, and connect from anywhere, on any device. RingCentral unifies voice, video, team messaging and collaboration, conferencing, online meetings, and integrated contact center solutions. RingCentral’s open platform integrates with leading business apps and enables customers to easily customize business workflows. RingCentral is headquartered in Belmont, California, and has offices around the world.

^©2018 RingCentral, Inc. All rights reserved. RingCentral, RingCentral Office and the RingCentral logo are trademarks of RingCentral, Inc.

Forward-Looking Statements

This press release contains “forward-looking statements,” including but not limited to, statements regarding our future financial results, our GAAP and non-GAAP guidance, our revenue growth and our expectation of exceeding $1 billion in revenue in 2020, our strength in the mid-market and enterprise segments and our channel partner momentum, the expected expansion of our product portfolio through our research and development investments and strategic acquisitions, the success of our reseller arrangement with AT&T, the extension of our lead in cloud communications, and our market opportunity. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on assumptions that may prove to be incorrect, which could cause actual results to differ materially from those expected or implied by the forward-looking statements. Among the important factors that could cause actual results to differ materially from those in any forward-looking statements are: our ability to grow at our expected rate of growth; our ability to add and retain larger and enterprise customers and enter new geographies and markets; our ability to continue to release, and gain customer acceptance of, new and improved versions of our services; our ability to compete successfully against existing and new competitors; our ability to enter into and maintain relationships with carriers and other resellers; our ability to successfully and timely integrate, and realize the benefits of any significant acquisition we may make; our ability to manage our expenses and growth; and general market, political, economic, and business conditions, as well as those risks and uncertainties included under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in our Form 10-Q for the quarter ended June 30, 2018, filed with the Securities and Exchange Commission; and in other filings we make with the Securities and Exchange Commission from time to time.

All forward-looking statements in this press release are based on information available to RingCentral as of the date hereof, and we undertake no obligation to update these forward-looking statements, to review or confirm analysts’ expectations, or to provide interim reports or updates on the progress of the current financial quarter.

Non-GAAP Financial Measures

Our reported financial results and financial outlook include certain Non-GAAP financial measures, including Non-GAAP software subscriptions gross margin, Non-GAAP other gross margin, Non-GAAP operating margin, Non-GAAP operating income (loss), Non-GAAP net income (loss) and Non-GAAP net income (loss) per diluted share. Non-GAAP software subscriptions gross margin is defined as Non-GAAP subscriptions gross profit divided by GAAP subscriptions revenue. Non-GAAP other gross margin is defined as Non-GAAP other gross profit divided by GAAP other revenue. Non-GAAP operating income (loss) is defined as operating income (loss) excluding share-based compensation, amortization of acquisition intangibles, and acquisition related matters including transaction costs, integration costs, restructuring costs, and acquisition-related retention payments, as well as changes in the fair value of contingent consideration obligations. Non-GAAP operating margin is defined as Non-GAAP operating income (loss) divided by total GAAP revenue. Non-GAAP net income (loss) is defined as GAAP net income (loss) excluding share-based compensation, intercompany remeasurement gains or losses, acquisition related matters, amortization of acquisition intangibles, non-cash interest expense associated with amortization of debt discount and issuance costs related to our convertible senior notes, and the related income tax effect of these adjustments.

Non-GAAP diluted shares outstanding include the impact on shares used in per share calculations of our outstanding capped call transactions. Our outstanding capped call transactions are anti-dilutive in GAAP earnings per share but are expected to mitigate the dilutive effect of our convertible notes and therefore are included in the calculations of non-GAAP diluted shares outstanding.

We have included Non-GAAP software subscriptions gross margin, Non-GAAP other gross margin, Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income (loss) per diluted share in this press release because they are key measures used by us to understand and evaluate our operating performance and trends, to prepare and approve our annual budget, and to develop short and long-term operational plans. In particular, the exclusion of certain expenses in calculating Non-GAAP software subscriptions gross margin, Non-GAAP other gross margin, Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income (loss) per diluted share provide useful measure for period-to-period comparisons of our business.

Although Non-GAAP software subscriptions gross margin, Non-GAAP other gross margin, Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income (loss) per diluted share, are frequently used by investors in their evaluations of companies, these non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation or as a substitute for financial information presented in accordance with GAAP. Because of these limitations, these non-GAAP financial measures should be considered alongside other financial performance measures.

Reconciliations of the Company’s non-GAAP financial measures to their most directly comparable GAAP measures has been provided in the financial statement tables included in this press release.

Other Measures

Our reported results also include our annualized exit monthly recurring subscriptions, RingCentral Office^® annualized exit monthly recurring subscriptions, mid-market and enterprise and enterprise annualized exit monthly recurring subscriptions, and net monthly subscriptions dollar retention. We define our annualized exit monthly recurring subscriptions as our monthly recurring subscriptions multiplied by 12. Our monthly recurring subscriptions equal the monthly value of all recurring charges in effect at the end of a given month. We believe this metric is a leading indicator of our anticipated subscriptions revenue. We calculate our RingCentral Office^® annualized exit monthly recurring subscriptions in the same manner as we calculate our annualized exit monthly recurring subscriptions, except that only customer subscriptions from RingCentral Office^® customers are included when determining monthly recurring subscriptions for the purposes of calculating this key business metric. We calculate mid-market and enterprise annualized exit monthly recurring subscriptions in the same manner as we calculate our annualized exit monthly recurring subscriptions, except that only customer subscriptions from customers with 50 seats or more are included. We calculate enterprise annualized exit monthly recurring subscriptions in the same manner as we calculate our annualized exit monthly recurring subscriptions, except that only customer subscriptions from customers generating $100,000 or more in monthly recurring revenue are included. We define Dollar Net Change as the quotient of (i) the difference of our Monthly Recurring Subscriptions at the end of a period minus our Monthly Recurring Subscriptions at the beginning of a period minus our Monthly Recurring Subscriptions at the end of the period from new customers we added during the period, (ii) all divided by the number of months in the period. We define our Average Monthly Recurring Subscriptions as the average of the Monthly Recurring Subscriptions at the beginning and end of the measurement period.

Investor Relations Contact:

Paul Thomas, RingCentral

(650) 458-4462

Paul.Thomas@RingCentral.com

Media Contact:

Jennifer Caukin, RingCentral

(650) 561-6348

Jennifer.Caukin@ringcentral.com

TABLE 1

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited, in thousands)

* Prior-period information has been adjusted for the adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on January 1, 2018.

TABLE 2

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in thousands, except per share data)

* Prior-period information has been adjusted for the adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on January 1, 2018.

TABLE 3

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in thousands)

* Prior-period information has been adjusted for the adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on January 1, 2018.

TABLE 4

RINGCENTRAL, INC.

RECONCILIATION OF OPERATING INCOME (LOSS)

GAAP MEASURES TO NON-GAAP MEASURES

(Unaudited, in thousands)

* Prior-period information has been adjusted for the adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on January 1, 2018.

TABLE 5

RINGCENTRAL, INC.

RECONCILIATION OF NET INCOME (LOSS)

GAAP MEASURES TO NON-GAAP MEASURES

(In thousands, except per share data) (Unaudited)

* Prior-period information has been adjusted for the adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which we adopted on January 1, 2018.

** The non-GAAP adjustments do not have an impact on our income tax provision due to our continued history of non-GAAP losses and full valuation allowance.

TABLE 6

RINGCENTRAL, INC.

RECONCILIATION OF FORECASTED OPERATING MARGIN

GAAP MEASURES TO NON-GAAP MEASURES

(Unaudited, in millions)