Five9 : 2021 Financial Analyst Day Presentation

© 2021 Five9, Inc. All rights reserved. Proprietary and confidential to Five9, Inc.

Safe Harbor

This presentation is proprietary and is intended solely for the information of the persons to whom it is presented. Disclosure of this presentation, its contents, extracts or abstracts to third parties is not authorized without the express written permission of Five9, Inc. (the "Company"), and it may not be retained, reproduced or distributed, in whole or in part, by any means (including electronic) without the prior written consent of Five9, Inc. The information in this presentation is as of its first date of disclosure, and its availability after such date shall not be construed as an update or reconfirmation of such information after such date.

This presentation includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, concerning events, trends, expectations and beliefs that may affect our industry or the Company, including potential growth drivers, projections and guidance concerning our future results of operations including our long-term model, our market opportunity and our long-term growth prospects. The Company has based these forward-looking statements on its current expectations and projections about future events and financial and operating trends that it believes may affect its financial condition, results of operations, business strategy, short-term and long-term business operations and objectives, and financial needs. Our actual results may be materially different from what we discuss here and you should not unduly rely on such forward looking statements. Please refer to our most recent Form 10-K and 10-Q under the caption "Risk Factors" and elsewhere in such reports, for detailed information about factors that could cause our results to differ from those set forth in such forward-looking statements, including risks related to the ongoing COVID-19 pandemic. Past performance is not necessarily indicative of future results. We undertake no obligation to update any such forward-looking information.

In addition to U.S. GAAP financials, this presentation includes certain non-GAAP financial measures. These non-GAAP financial measures are in addition to, and not a substitute for or superior to, measures of financial performance prepared in accordance with U.S. GAAP and may differ from non-GAAP measures used by other companies in our industry. The Company considers these non-GAAP financial measures to be important because they provide useful measures of the operating performance of the Company, exclusive of unusual events, as well as factors that do not directly affect what we consider to be our core operating performance. The non-GAAP financial measures should not be considered a substitute for financial information presented in accordance with GAAP. Please see the reconciliation of non- GAAP financial measures to the most directly comparable GAAP measure set forth in the Appendix to this presentation.

This presentation contains statistical data that we obtained from industry publications and reports generated by third parties. Although we believe that the publications and reports are reliable, we have not independently verified this statistical data and accordingly, we cannot guarantee their accuracy or completeness.

• © 2021 Five9, Inc. All rights reserved. Proprietary and confidential to Five9, Inc.

Agenda

Topic	Presenter
Reimagining Customer Experience	Rowan Trollope, CEO
Vision and Roadmap	Callan Schebella, EVP Product
Go-to-Market Momentum	Dan Burkland, President
Break
Customer Panel	Moderated by: Dan Burkland, President
Building Blocks of Durable Growth	Barry Zwarenstein, CFO
Q&A	CEO, CFO, President, EVP Product

5

© 2021 Five9, Inc. All rights reserved. Proprietary and confidential to Five9, Inc.

© 2021 Five9, Inc. All rights reserved. Proprietary and confidential to Five9, Inc.

Reimagining Customer Experience

Five9 Journey	Five9 Positioning	Long-Term Strategy
We do what we say	Capitalizing on key trends	Driving durable growth

• © 2021 Five9, Inc. All rights reserved. Proprietary and confidential to Five9, Inc.