Description of Capital Stock

The following summary description of our capital stock is based on the provisions of our Amended and Restated Certificate of Incorporation, as amended (the “Restated Certificate”), our amended and restated bylaws (the “Bylaws”) and the applicable provisions of the Delaware General Corporation Law. This information may not be complete in all respects and is qualified entirely by reference to the provisions of the Restated Certificate, the Bylaws and the Delaware General Corporation Law.

Our authorized capital stock consists of 200,000,000 shares of common stock and 10,000,000 shares of undesignated preferred stock, par value $0.000001 per share. The rights, preferences and privileges of the preferred stock may be designated from time to time by our board of directors (the “Board”).

Voting. Each holder of our common stock is entitled to one vote for each share held of record on any matter submitted to a vote of stockholders. The Restated Certificate does not provide for cumulative voting for the election of directors.

Dividends and Distributions. Subject to preferences that may apply to any outstanding shares of preferred stock, the holders of common stock will be entitled to receive ratably any dividend or distribution of cash, property or shares of our capital stock that is paid or distributed by the Company.

Liquidation Rights. Upon our liquidation, dissolution or winding up, holders of our common stock will be entitled to share ratably in all assets remaining after payment of any liabilities and the liquidation preferences and any accrued or declared but unpaid dividends, if any, with respect to any outstanding shares of preferred stock.

No Preemptive, Conversion or Redemption Rights. Holders of common stock have no preemptive rights and no right to convert their common stock into other securities. There are no redemption or sinking fund provisions applicable to our common stock.

Subject to Rights of Preferred Stock. The rights of the holders of our common stock are subject to, and may be adversely affected by, the rights of holders of any shares of preferred stock that we may designate and issue in the future.

The Board may, without further action by our stockholders, fix the rights, preferences, privileges, qualifications and restrictions of up to an aggregate of 10,000,000 shares of preferred stock in one or more series and authorize their issuance. The Board will fix the rights, preferences, privileges, qualifications and restrictions of each series of preferred stock in a certificate of designation relating to that series. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of our common stock. The issuance of our preferred stock could adversely affect the voting power of holders of our common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control or other corporate action.

The General Corporation Law of the State of Delaware, the state of our incorporation, provides that the holders of preferred stock will have the right to vote separately as a class on any proposal involving fundamental changes to the rights of holders of that preferred stock. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation.

Because our stockholders do not have cumulative voting rights, stockholders holding a majority of our outstanding shares of common stock will elect all of our directors. The Restated Certificate and the Bylaws provide that all stockholder actions must be effected at a duly called meeting of stockholders and not by written consent. A special meeting of stockholders may be called only by a majority of our whole Board, Board chair or our chief executive officer.

Although we are in the process of phasing out the classification of the Board in accordance with our Restated Certificate, the Board currently remains divided into three classes with staggered three-year terms. The Restated Certificate further provides that the affirmative vote of holders of at least 66 ⅔% of the voting power of the then-outstanding shares of voting stock, voting as a single class, will be required to amend certain provisions of our certificate of incorporation, including provisions relating to the classified Board, removal of directors, special meetings, actions by written consent and cumulative voting. The affirmative vote of holders of at least 66 ⅔% of the voting power of all of the then-outstanding shares of voting stock, voting as a single class, will be required to amend or repeal our Bylaws, although our Bylaws may be amended by a simple majority vote of the Board.

The foregoing provisions make it more difficult for our existing stockholders to replace the Board as well as for another party to obtain control of the Company by replacing the Board. Since the Board has the power to retain and discharge our officers, these provisions could also make it more difficult for existing stockholders or another party to effect a change in management. In addition, the authorization of undesignated preferred stock makes it possible for the Board to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to change control of the Company.

These provisions are intended to enhance the likelihood of continued stability in the composition of the Board and its policies and to discourage certain tactics that may be used in proxy fights. However, such provisions could have the effect of discouraging others from making tender offers for our shares and may have the effect of deterring hostile takeovers or delaying changes in control or management of the Company. As a consequence, these provisions may also inhibit fluctuations in the market price of our stock that could result from actual or rumored takeover attempts.

We are subject to Section 203 of the Delaware General Corporation Law, which prohibits a Delaware corporation from engaging in any business combination with any interested stockholder for a period of three years after the date that such stockholder became an interested stockholder, with the following exceptions:

•before such date, the board of directors of the corporation approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder;

•upon closing of the transaction that 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 began, excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested investor) those shares owned by (i) persons who are directors and also officers and (ii) employee stock plans in which employee participants do not have the right to determine confidentially whether the shares held subject to the plan will be tendered in a tender or exchange offer; or

•on or after such date, the business combination is approved by the board of directors and authorized at an annual or special meeting of the stockholders, and not by written consent, by the affirmative vote of at least 66 ⅔% of the outstanding voting stock that is not owned by the interested stockholder.

In general, Section 203 defines an “interested stockholder” as an entity or person who, together with the person’s affiliates and associates, beneficially owns, or within three years prior to the time of determination of interested stockholder status did own, 15% or more of the outstanding voting stock of the corporation.

In general, Section 203 defines “business combination” to include the following:

•any merger or consolidation involving the corporation and the interested stockholder;

•any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the interested stockholder;

•subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested stockholder;

•any transaction involving the corporation that has the effect of increasing the proportionate share of the stock or any class or series of the corporation beneficially owned by the interested stockholder; or

•the receipt by the interested stockholder of the benefit of any loss, advances, guarantees, pledges or other financial benefits by or through the corporation.

The Restated Certificate provides that the Court of Chancery of the State of Delaware will be the exclusive forum for any derivative action or proceeding brought on behalf of the Company; any action asserting a breach of fiduciary duty; any action asserting a claim against us arising pursuant to the Delaware General Corporation Law, the Restated Certificate or the Bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine, unless we consent in writing to the selection of an alternative forum.

The Bylaws provide that the U.S. federal district courts will be the exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended (the “Securities Act”), unless we consent in writing to the selection of an alternative forum.

Section 145 of the Delaware General Corporation Law authorizes a court to award, or a corporation’s board of directors to grant, indemnity to directors and officers in terms sufficiently broad to permit such indemnification under certain circumstances for liabilities, including reimbursement for expenses incurred, arising under the Securities Act. Our Restated Certificate and Bylaws each provide for indemnification of our directors, officers, employees and other agents to the maximum extent permitted by the Delaware General Corporation Law.

We have entered into indemnification agreements with our directors and officers, whereby we have agreed to indemnify our directors and officers to the fullest extent permitted by law, including indemnification against expenses and liabilities incurred in legal proceedings to which the director or officer was, or is threatened to be made, a party by reason of the fact that such director or officer is or was a director, officer, employee or agent of the Company, provided that such director or officer acted in good faith and in a manner that the director or officer reasonably believed to be in, or not opposed to, our best interest.

We maintain insurance policies that indemnify our directors and officers against various liabilities arising under the Securities Act and the Securities Exchange Act of 1934, as amended, that might be incurred by any director or officer in his or her capacity as such.