Exhibit 99.1

RingCentral Announces Third Quarter 2016 Results

Software Subscriptions Revenue up 31%

RingCentral Office® ARR up 39%

GAAP Software Subscriptions Gross Margin of 79%; Non-GAAP: 80%

Belmont, Calif. – October 25, 2016 – RingCentral, Inc. (NYSE: RNG), a leading provider of cloud business communications and collaboration solutions, today announced financial results for the third quarter ended September 30, 2016.

Third Quarter Financial Highlights

“In the third quarter, we executed well by balancing revenue growth, investments in enterprise, and expanding margins to drive results at the high-end or above our outlook,” said Vlad Shmunis, RingCentral’s Chairman and CEO. “Growth in our enterprise pipeline has accelerated meaningfully over the past three quarters, which we believe demonstrates the success of our focus on innovation and the investments we have made with our comprehensive go-to-market strategy. We were also honored to once again be placed in the leader’s quadrant and furthest to the right on vision in Gartner’s 2016 Magic Quadrant for UCaaS, further extending our leadership position.”

Financial Results for the Third Quarter 2016

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Third Quarter 2016 and Recent Business Highlights

Conference Call Details:

About RingCentral

RingCentral, Inc. (NYSE: RNG) is a leading provider of cloud-based business communications and collaboration solutions. RingCentral’s cloud solution is easier to manage, and more flexible and cost-efficient than legacy on-premises communications systems. It meets the needs of modern distributed and mobile workforces spanning SMB to Enterprises globally. RingCentral, Business Communications Made Simple. RingCentral is headquartered in Belmont, California. RingCentral, RingCentral Office, and the RingCentral logo are registered trademarks of RingCentral, Inc.

Forward-Looking Statements

This press release contains “forward-looking statements,” including but not limited to, statements regarding our future, our GAAP and non-GAAP guidance, our markets and strategic opportunities, our expectations regarding the growth in our enterprise pipeline, and our planned investments and innovation. 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

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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 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, 2016, 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 include certain Non-GAAP financial measures, including Non-GAAP operating income (loss), Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income per diluted share. Non-GAAP operating income (loss) is defined as operating income (loss) excluding share-based compensation, amortization of acquisition intangibles, and acquisition related matters. 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 net income (loss) excluding stock-based compensation, intercompany remeasurement gains or losses, acquisition related matters, amortization of acquisition intangibles, and tax benefit for release of valuation allowance.

We have included Non-GAAP operating income (loss), Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income per diluted share in this press release because they are key measures used by us to understand and evaluate our core 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 operating income (loss), Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income per diluted share can provide a useful measure for period-to-period comparisons of our core business.

Although Non-GAAP operating income (loss), Non-GAAP operating margin, Non-GAAP net income (loss), and Non-GAAP net income 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 historical non-GAAP financial measures and key metrics 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 total annualized exit monthly recurring subscriptions, RingCentral Office^® annualized exit monthly recurring subscriptions, and net monthly subscriptions dollar retention. We define our total annualized exit monthly recurring subscriptions as our total monthly recurring subscriptions multiplied by 12. Our total monthly recurring subscriptions equal the monthly value of all customer subscriptions 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 total 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 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:

Darren Yip, RingCentral

(650) 641-2220

ir@RingCentral.com

Media Contact:

Jennifer Caukin, RingCentral

650-561-6348

Jennifer.caukin@ringcentral.com

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TABLE 1

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited, in thousands)

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TABLE 2

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in thousands, except per share data)

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TABLE 3

RINGCENTRAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in thousands)

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TABLE 4

RINGCENTRAL, INC.

RECONCILIATION OF OPERATING INCOME (LOSS)

GAAP MEASURES TO NON-GAAP MEASURES

(Unaudited, in thousands)

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TABLE 5

RINGCENTRAL, INC.

RECONCILIATION OF NET INCOME (LOSS)

GAAP MEASURES TO NON-GAAP MEASURES

(In thousands, except per share data)

(Unaudited)

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TABLE 6

RINGCENTRAL, INC.

PRO FORMA² STATEMENT OF GROSS MARGIN UNDER AGENCY MODEL

(Unaudited, in thousands)

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