Exhibit 99.1

RingCentral Announces First Quarter 2017 Results

Software Subscriptions Revenue up 30%

RingCentral Office® ARR up 39%

GAAP Software Subscriptions Gross Margin of 80.5%; Non-GAAP: 81.3%

Belmont, Calif. – April 25, 2017 – RingCentral, Inc. (NYSE: RNG), a leading provider of cloud business communications and collaboration solutions, today announced financial results for the first quarter ended March 31, 2017.

First Quarter Financial Highlights

“The first quarter was a great start to the year.” said Vlad Shmunis, RingCentral’s Chairman and CEO. “Our solid results were primarily driven by the momentum we are seeing with mid-market and enterprise customers and with our enterprise reseller partners. The mid-market and enterprise customer segments are now an over $115 million business, growing at over 85% year over year. We continue to put distance between us and the competition as the largest and fastest growing pure-play cloud collaborative communications solutions leader. With this momentum and the very large underpenetrated market, we continue to believe that we will be a $1 billion revenue company by the end of 2020.”

Financial Results for the First Quarter 2017

As of January 1, 2017, RingCentral transitioned from an agency model to a direct phone sales model, under which RingCentral will be recognizing the full sale price and cost of the product instead of receiving a commission for phone sales. Adjusting for the new direct model on a comparable basis, total revenue grew 27% year over year and the total gross margin would have been 1.9% higher year over year.

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Recent Business Highlights

Chief Financial Officer Transition

The Company also announced a transition in its Chief Financial Officer position. Clyde Hosein, who has served as RingCentral’s Chief Financial Officer since August 2013, announced he will be leaving the company at the end of May 2017. Mitesh Dhruv is being promoted to the CFO role. Mr. Dhruv is currently the Company’s SVP of Finance and Strategy and has been with the company since April 2012.

Conference Call Details:

About RingCentral

RingCentral, Inc. (NYSE: RNG) is a leading provider of cloud-based global collaborative communications solutions. More flexible and cost-effective than legacy on-premise systems, RingCentral empowers today’s mobile and distributed workforce to communicate, collaborate, and connect from anywhere, on any device. RingCentral unifies voice, video,

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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. RingCentral, RingCentral Office, Glip 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, our GAAP and non-GAAP guidance, our markets and strategic opportunities, our momentum with mid-market and enterprise customers and enterprise reseller partners and expected growth in these segments, our revenue growth and our expectation of reaching $1 billion in revenues by the end of 2020. 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 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-K for the year ended December 31, 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.

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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 software subscriptions gross margin, Non-GAAP net income (loss), and Non-GAAP net income (loss) 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 software subscriptions gross margin is defined as Non-GAAP subscriptions gross profit divided by GAAP subscription revenue. Non-GAAP net income (loss) is defined as net income (loss) excluding stock-based compensation, intercompany remeasurement gains or losses, acquisition related matters and amortization of acquisition intangibles.

We have included Non-GAAP operating income (loss), Non-GAAP operating margin, Non-GAAP software subscriptions gross 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 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 software subscriptions gross margin, Non-GAAP net income (loss), and Non-GAAP net income (loss) 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 software subscriptions gross 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 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:

Pete Lowry, 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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