Description of Registrant

The following brief description of the capital stock of Five9, Inc. (“us”, “our”, “we”, or the “Company”) is a summary. This summary is not complete and is subject to and qualified in its entirety by reference to the complete text of our Amended and Restated Certificate of Incorporation (“Certificate of Incorporation”), and our Amended and Restated Bylaws (“Bylaws”) previously filed with the U.S. Securities and Exchange Commission and incorporated by reference as an exhibit to this Annual Report on Form 10-K of which this Exhibit 4.4 forms a part. We encourage you to read the Certificate of Incorporation and Bylaws carefully.

The Certificate of Incorporation provides that the Company may issue 455,000,000 shares of capital stock, of which 450,000,000 shares are designated as common stock, par value $0.001 per share, and 5,000,000 shares are designated as of preferred stock, par value $0.001 per share.

The holders of our common stock are entitled to one vote per share on any matter to be voted upon by stockholders. The Certificate of Incorporation does not provide for cumulative voting in connection with the election of directors, and accordingly, holders of more than 50% of the shares voting will be able to elect all of the directors. The holders of a majority of the shares of common stock issued and outstanding constitute a quorum at all meetings of stockholders for the transaction of business.

The holders of our common stock are entitled to dividends if, as and when declared by our board of directors, from funds legally available therefor, subject to the preferential rights of the holders of our preferred stock, if any, and certain contractual limitations on our ability to declare and pay dividends.

No holder of our common stock has any preemptive right to subscribe for any shares of our capital stock issued in the future.

Upon any voluntary or involuntary liquidation, dissolution, or winding up of our affairs, the holders of our common stock are entitled to share ratably in all assets remaining after payment of creditors and subject to prior distribution rights of our preferred stock, if any.

Our board of directors may, by resolution, establish one or more classes or series of preferred stock having the number of shares and relative voting rights, designations, dividend rates, liquidation, and other rights, preferences, and limitations as may be fixed by them without further stockholder

approval. The holders of our preferred stock may be entitled to preferences over common stockholders with respect to dividends, liquidation, dissolution, or our winding up in such amounts as are established by the resolutions of our board of directors approving the issuance of such shares.

The issuance of our preferred stock may have the effect of delaying, deferring or preventing a change in control of us without further action by our stockholders and may adversely affect voting and other rights of holders of our common stock. In addition, issuance of preferred stock, while providing desirable flexibility in connection with possible acquisitions, financings and other corporate purposes, could make it more difficult for a third party to acquire a majority of our outstanding shares of voting stock.

We are subject to Section 203 of the DGCL (“Section 203”). In general, Section 203 prohibits a publicly held Delaware corporation from engaging in various “business combination” transactions with any interested stockholder for a period of three years following the date of the transactions in which the person became an interested stockholder, unless:

•the business combination or the transaction which resulted in the stockholder becoming an interested stockholder is approved by the board of directors prior to the date the interested stockholder obtained such status;

•upon consummation of the transaction which resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested stockholder) those shares owned (a) by persons who are directors and also officers and (b) employee stock plans in which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or

•on or subsequent to such date the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders by the affirmative vote of at least 66 2/3% of the outstanding voting stock which is not owned by the interested stockholder.

A “business combination” is defined to include mergers, asset sales, and other transactions resulting in financial benefit to a stockholder. In general, an “interested stockholder” is a person who, together with affiliates and associates, owns (or within three years, did own) 15% or more of a corporation’s voting stock. The statute could prohibit or delay mergers or other takeover or change in control attempts with respect to our company and, accordingly, may discourage attempts to acquire us even though such a transaction may offer our stockholders the opportunity to sell their stock at a price above the prevailing market price.

Provisions in the Certificate of Incorporation and Bylaws may have the effect of delaying or preventing a change in control or changes in our management. The Certificate of Incorporation and Bylaws:

•provide that our board of directors is classified into three classes of directors;

•provide that stockholders may remove directors only for cause and only with the approval of holders of at least 66 2⁄3% of our then outstanding capital stock;

•provide that the authorized number of directors may be changed only by resolution of the board of directors;

•provide that all vacancies, including newly created directorships, may, except as otherwise required by law, be filled by the affirmative vote of a majority of directors then in office, even if less than a quorum;

•provide that our stockholders may not take action by written consent, and may only take action at annual or special meetings of our stockholders;

•provide that stockholders seeking to present proposals before a meeting of stockholders or to nominate candidates for election as directors at a meeting of stockholders must provide notice in writing in a timely manner, and also specify requirements as to the form and content of a stockholder’s notice;

•restrict the forum for certain litigation against us to Delaware;

•do not provide for cumulative voting rights (therefore allowing the holders of a majority of the shares of common stock entitled to vote in any election of directors to elect all of the directors standing for election);

•provide that special meetings of our stockholders may be called only by the chairman of the board of directors, our chief executive officer or the board of directors pursuant to a resolution adopted by a majority of the total number of authorized directors; and

•provide that stockholders will be permitted to amend the Bylaws and certain parts of the Certificate of Incorporation only upon receiving at least 66 2/3% of the votes entitled to be cast by holders of all outstanding shares then entitled to vote generally in the election of directors, voting together as a single class.

Our common stock is listed on The Nasdaq Global Market under the symbol “FIVN.”

The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company, LLC.