Description of Common Stock of Tenable Holdings, Inc

The following descriptions of the common stock of Tenable Holdings, Inc., or the Company, Delaware law and certain provisions of the Company’s amended and restated certificate of incorporation and amended and restated bylaws are summaries. These summaries are qualified in the entirety by reference to the provisions of the Delaware General Corporation Law, or the DGCL, and the complete text of the Company’s amended and restated certificate of incorporation and amended and restated bylaws, which are incorporated by reference as Exhibits 3.1 and 3.2, respectively, of the Company’s Annual Report on Form 10-K to which this description is also an exhibit.

The amended and restated certificate of incorporation authorizes the issuance of up to 500,000,000 shares of common stock, $0.01 par value per share, and 10,000,000 shares of preferred stock, $0.01 par value per share, all of which shares of preferred stock are undesignated. The Company’s board of directors may establish the rights and preferences of the preferred stock from time to time.

Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors. Under the amended and restated certificate of incorporation and amended and restated bylaws, holders of common stock do not have cumulative voting rights. Because of this, the holders of a majority of the shares of common stock entitled to vote in any election of directors can elect all of the directors standing for election, if they should so choose.

Subject to preferences that may be applicable to any then-outstanding preferred stock, holders of common stock are entitled to receive ratably those dividends, if any, as may be declared from time to time by the board of directors out of legally available funds.

In the event of liquidation, dissolution or winding up of the Company, holders of common stock will be entitled to share ratably in the net assets legally available for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then-outstanding shares of preferred stock.

Holders of common stock have no preemptive, conversion or subscription rights and there are no redemption or sinking fund provisions applicable to the common stock. The rights, preferences and privileges of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that the board of directors may designate in the future.

The Company is subject to Section 203 of the DGCL, or Section 203, 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:

outstanding voting stock owned by the interested stockholder) those shares owned (1) by persons who are directors and also officers and (2) 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

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

 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.

A Delaware corporation may “opt out” of these provisions with an express provision in its original certificate of incorporation or an express provision in its amended and restated certificate of incorporation or amended and restated bylaws resulting from a stockholders’ amendment approved by at least a majority of the outstanding voting shares. The Company has not opted out of these provisions. As a result, mergers or other takeover or change in control attempts of the Company may be discouraged or prevented.

The amended and restated certificate of incorporation provides for the Company’s board of directors to be divided into three classes with staggered three-year terms. Only one class of directors will be elected at each annual meeting of the Company’s stockholders, with the other classes continuing for the remainder of their respective three-year terms. Because the Company’s stockholders do not have cumulative voting rights, stockholders holding a majority of the shares of the Company’s common stock outstanding will be able to elect all of the directors. The amended and restated certificate of incorporation and the amended and restated bylaws also provide that directors may be removed by the stockholders only for cause upon the vote of 66 2/3% of the Company’s outstanding common stock. Furthermore, the authorized number of directors may be changed only by resolution of the board of directors, and vacancies and newly created directorships on the board of directors may, except as otherwise required by law or determined by the board, only be filled by a majority vote of the directors then serving on the board, even though less than a quorum.

The amended and restated certificate of incorporation and amended and restated bylaws also provide that all stockholder actions must be effected at a duly called meeting of stockholders and eliminates the right of stockholders to act by written consent without a meeting. The amended and restated bylaws provide that only the chairman of the board, chief executive officer or the board of directors pursuant to a resolution adopted by a majority of the total number of authorized directors may call a special meeting of stockholders.

The amended and restated bylaws also 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 timely advance notice in writing, and specify requirements as to the form and content of a stockholder’s notice.

The amended and restated certificate of incorporation and amended and restated bylaws provide that the stockholders cannot amend many of the provisions described above except by a vote of 66 2/3% or more of the Company’s outstanding common stock.

The combination of these provisions will make it more difficult for the Company’s existing stockholders to replace the board of directors as well as for another party to obtain control of the Company by replacing the board of directors. Since the board of directors has the power to retain and discharge the Company’s 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 of directors to issue preferred stock with voting or other rights or preferences that could delay or impede the success of any attempt to change control of the Company.

These provisions are intended to facilitate the Company’s continued innovation and the risk-taking that it requires, permit the Company’s board of directors to continue to prioritize the Company’s long-term goals rather than short-term results, enhance the likelihood of continued stability in the composition of the board of directors and its policies. These provisions could discourage potential takeover attempts. These provisions are also designed to reduce the Company’s vulnerability to an unsolicited acquisition proposal 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 the Company’s shares and may have the effect of deterring hostile takeovers or delaying changes in control or management. As a consequence, these provisions may also inhibit increases in the market price of the Company’s stock that could result from actual or rumored takeover attempts.

The amended and restated certificate of incorporation provides that no officer or director of the Company who is also an officer, director, managing director or other employee of Accel or Insight (including any portfolio company thereof), will be liable to the Company or its stockholders for breach of any fiduciary duty by reason of the fact that any such individual directs a corporate opportunity to any member of Accel or Insight (including any portfolio company thereof), instead of to the Company, or does not communicate information regarding a corporate opportunity to the Company that the officer, director, employee, managing director or other affiliate has directed to any member of Accel or Insight (including any portfolio company thereof), unless such corporate opportunity is expressly offered to such officer or director in his or her capacity as an officer or director of the Company.

The amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware will be the exclusive forum for: (1) any derivative action or proceeding brought on the Company’s behalf; (2) any action asserting a breach of fiduciary duty owed by any director, officer or other employee to the Company or its stockholders; (3) any action asserting a claim against the Company or any director or officer or other employee arising pursuant to the DGCL, the amended and restated certificate of incorporation or amended and restated bylaws; or (4) any action asserting a claim against the Company or any director or officer or other employee that is governed by the internal affairs doctrine. The amended and restated certificate of incorporation further provides that the federal district courts of the United States of America will be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act.

The transfer agent and registrar for the Company’s common stock is American Stock Transfer & Trust Company, LLC. The transfer agent’s address is 6201 15th Avenue, Brooklyn, New York 11219.

The common stock is listed on the Nasdaq Global Select Market under the symbol “TENB.”