Exhibit 3.2

TENABLE HOLDINGS, INC.

THIRD AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

TENABLE HOLDINGS, INC., a corporation organized and existing under the laws of the State of Delaware (the “Company”), does hereby certify as follows:

FIRST: The name of the Company is Tenable Holdings, Inc.

SECOND: The Company was originally formed as Tenable Holdings, Inc., a company formed under the jurisdiction of the State of Delaware on October 21, 2015. The Company’s Certificate of Incorporation was last amended and restated by the Amended and Restated Certificate of Incorporation on December 17, 2015. A Certificate of Correction to the Amended and Restated Certificate of Incorporation was filed on December 22, 2015.

THIRD: This Amended and Restated Certificate of Incorporation has been duly adopted and approved by the Board of Directors of the Company.

FOURTH: This Amended and Restated Certificate of Incorporation was approved by the holders of the requisite number of shares of the Company in accordance with Section 228 of the Delaware General Corporate Law (“DGCL”). This Amended and Restated Certificate of Incorporation has been duly adopted in accordance with the provisions of Sections 242 and 245 of the DGCL by the Board of Directors and the stockholders of the Company.

FIFTH: The Amended and Restated Certificate of Incorporation so adopted reads in full as set forth in Exhibit A attached hereto and is incorporated herein by reference in its entirety.

* * * *

IN WITNESS WHEREOF, Tenable Holdings, Inc. has caused this Amended and Restated Certificate of Incorporation to be signed by its President and Chief Executive Officer on this      day of             , 2018.

Exhibit A

TENABLE HOLDINGS, INC.

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

I.

The name of this corporation is Tenable Holdings, Inc. (the “Company”).

II.

The address of the registered office of the Company in the State of Delaware is 1209 Orange Street, City of Wilmington, County of New Castle, Zip Code 19801, and the name of the registered agent of the Company in the State of Delaware at such address is The Corporation Trust Company.

III.

The purpose of the Company is to engage in any lawful act or activity for which a corporation may be organized under the Delaware General Corporation Law (“DGCL”).

IV.

A. The Company is authorized to issue two classes of stock to be designated, respectively, “Common Stock” and “Preferred Stock.” The total number of shares which the Company is authorized to issue is five hundred ten million (510,000,000) shares, of which five hundred million (500,000,000) shares shall be Common Stock, having a par value per share of $0.01, and ten million (10,000,000) shares shall be Preferred Stock, having a par value per share of $0.01.

B. The Preferred Stock may be issued from time to time in one or more series. The Board of Directors of the Company (the “Board”) is hereby expressly authorized to provide for the issue of all or any of the shares of the Preferred Stock in one or more series, and to fix the number of shares and to determine or alter for each such series, such voting powers, full or limited, or no voting powers, and such designation, preferences, and relative, participating, optional, or other rights and such qualifications, limitations, or restrictions thereof, as shall be stated and expressed in the resolution or resolutions adopted by the Board providing for the issuance of such shares and as may be permitted by the DGCL. The Board is also expressly authorized to increase or decrease the number of shares of any series subsequent to the issuance of shares of that series, but not below the number of shares of such series then outstanding. In case the number of shares of any series shall be decreased in accordance with the foregoing sentence, the shares constituting such decrease shall resume the status that they had prior to the adoption of the resolution originally fixing the number of shares of such series. The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the voting power of the stock of the Company entitled to vote thereon, without a separate vote of the holders of the Preferred Stock, or of any series thereof, unless a vote of any such holders is required pursuant to the terms of any certificate of designation filed with respect to any series of Preferred Stock.

2

C. Each outstanding share of Common Stock shall entitle the holder thereof to one vote on each matter properly submitted to the stockholders of the Company for their vote; provided, however, that, except as otherwise required by law, holders of Common Stock shall not be entitled to vote on any amendment to this Amended and Restated Certificate of Incorporation (including any certificate of designation filed with respect to any series of Preferred Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together as a class with the holders of one or more other such series, to vote thereon by law or pursuant to this Amended and Restated Certificate of Incorporation (including any certificate of designation filed with respect to any series of Preferred Stock).

V.

For the management of the business and for the conduct of the affairs of the Company, and in further definition, limitation and regulation of the powers of the Company, of its directors and of its stockholders or any class thereof, as the case may be, it is further provided that:

A. MANAGEMENT OF BUSINESS. The management of the business and the conduct of the affairs of the Company shall be vested in its Board.

B. BOARD OF DIRECTORS.

1. Number. The number of directors that shall constitute the Board shall be fixed exclusively by resolutions adopted by a majority of the authorized number of directors constituting the Board.

2. Term. Subject to the rights of the holders of any series of Preferred Stock to elect additional directors under specified circumstances, following the closing of the initial public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended (the “Securities Act”) covering the offer and sale of securities to the public (the “Initial Public Offering”), the directors shall be divided into three classes designated as Class I, Class II and Class III, respectively. The Board is authorized to assign members of the Board already in office to such classes at the time the classification becomes effective. At the first annual meeting of stockholders following the closing of the Initial Public Offering, the term of office of the Class I directors shall expire and Class I directors shall be elected for a full term of three years. At the second annual meeting of stockholders following the closing of the Initial Public Offering, the term of office of the Class II directors shall expire and Class II directors shall be elected for a full term of three years. At the third annual meeting of stockholders following the closing of the Initial Public Offering, the term of office of the Class III directors shall expire and Class III directors shall be elected for a full term of three years. At each succeeding annual meeting of stockholders, directors shall be elected for a full term of three years to succeed the directors of the class whose terms expire at such annual meeting. Notwithstanding the foregoing provisions of this section, each director shall serve until his or her successor is duly elected and qualified or until his or her earlier death, resignation or removal. No decrease in the number of directors constituting the Board shall shorten the term of any incumbent director.

3

3. Removal.

a. Subject to the rights of any series of Preferred Stock to elect additional directors under specified circumstances, following the closing of the Initial Public Offering, neither the Board nor any individual director may be removed without cause.

b. Subject to any limitation imposed by applicable law, any individual director or directors may be removed with cause by the affirmative vote of the holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all then-outstanding shares of capital stock of the Company entitled to vote generally at an election of directors.

4. Vacancies. Subject to any limitations imposed by applicable law and subject to the rights of the holders of any series of Preferred Stock, any vacancies on the Board resulting from death, resignation, disqualification, removal or other causes, and any newly created directorships resulting from any increase in the number of directors, shall, unless the Board determines by resolution that any such vacancies or newly created directorships shall be filled by the stockholders and except as otherwise provided by applicable law, be filled only by the affirmative vote of a majority of the directors then in office, even though less than a quorum of the Board, and not by the stockholders. Any director elected in accordance with the preceding sentence shall hold office for the remainder of the full term of the director for which the vacancy was created or occurred and until such director’s successor shall have been elected and qualified.

C. BYLAW AMENDMENTS. The Board is expressly empowered to adopt, amend or repeal the Bylaws of the Company. Any adoption, amendment or repeal of the Bylaws of the Company by the Board shall require the approval of a majority of the authorized number of directors. The stockholders shall also have power to adopt, amend or repeal the Bylaws of the Company; provided, however, that, in addition to any vote of the holders of any class or series of stock of the Company required by law or by this Amended and Restated Certificate of Incorporation, such action by stockholders shall require the affirmative vote of the holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of the then-outstanding shares of the capital stock of the Company entitled to vote generally in the election of directors, voting together as a single class.

D. WRITTEN BALLOTS. The directors of the Company need not be elected by written ballot unless the Bylaws so provide.

E. ACTION BY STOCKHOLDERS. No action shall be taken by the stockholders of the Company except at an annual or special meeting of stockholders called in accordance with the Bylaws and no action shall be taken by the stockholders by written consent or electronic transmission.

F. ADVANCE NOTICE. Advance notice of stockholder nominations for the election of directors and of business to be brought by stockholders before any meeting of the stockholders of the Company shall be given in the manner provided in the Bylaws of the Company.

4

VI.

A. The liability of the directors for monetary damages shall be eliminated to the fullest extent under applicable law. To the fullest extent permitted by applicable law, the Company is authorized to provide indemnification of (and advancement of expenses to) directors, officers and agents of the Company (and any other persons to which applicable law permits the Company to provide indemnification) through Bylaw provisions, agreements with such agents or other persons, vote of stockholders or disinterested directors or otherwise in excess of the indemnification and advancement otherwise permitted by such applicable law. If applicable law is amended after approval by the stockholders of this Article VI to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director to the Company shall be eliminated or limited to the fullest extent permitted by applicable law, as so amended.

B. Any repeal or modification of this Article VI shall only be prospective and shall not affect the rights or protections or increase the liability of any director under this Article VI in effect at the time of the alleged occurrence of any act or omission to act giving rise to liability or indemnification.

VII.

Unless the Company consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall be the sole and exclusive forum for (i) any derivative action or proceeding brought on behalf of the Company; (ii) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee of the Company to the Company or the Company’s stockholders; (iii) any action asserting a claim against the Company or any director or officer or other employee of the Company arising pursuant to any provision of the DGCL, this Amended and Restated Certificate of Incorporation or the Bylaws of the Company; or (iv) any action asserting a claim against the Company or any director or officer or other employee of the Company governed by the internal affairs doctrine.

Unless the Company consents in writing to the selection of an alternative forum, the federal district courts of the United States of America shall be the exclusive forum for the resolution of any complaint asserting a cause of action arising under the 1933 Act.

Any person or entity purchasing or otherwise acquiring any interest in shares of capital stock of the Company shall be deemed to have notice of and to have consented to the provisions of this Article VII.

VIII.

A. The Company reserves the right to amend, alter, change or repeal any provision contained in this Amended and Restated Certificate of Incorporation, in the manner now or hereafter prescribed by statute, except as provided in paragraph B. of this Article VIII, and all rights conferred upon the stockholders herein are granted subject to this reservation.

B. Notwithstanding any other provisions of this Amended and Restated Certificate of Incorporation or any provision of applicable law which might otherwise permit a lesser vote or no vote, but in addition to any affirmative vote of the holders of any particular class or series of

5

the capital stock of the Company required by law or by this Amended and Restated Certificate of Incorporation or any certificate of designation filed with respect to a series of Preferred Stock, the affirmative vote of the holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting power of all of the then-outstanding shares of capital stock of the Company entitled to vote generally in the election of directors, voting together as a single class, shall be required to alter, amend or repeal Articles V, VI, VII and VIII.

XIV.

A. Subject to any express agreement that may from time to time be in effect, a Covered Person may, and shall have no duty not to, in each case on behalf of Accel or Insight, as applicable, (i) carry on and conduct, whether directly or indirectly (including, without limitation, as a partner in any partnership, or as a joint venturer in any joint venture, or as an officer, director or stockholder of any corporation, or as a participant in any syndicate, pool, trust or association), any business of any kind, nature or description, whether or not such business is competitive with or in the same or similar lines of business as the Company, (ii) do business with any client, customer, vendor or lessor of any of the Company or its Affiliates, and (iii) make investments in any kind of property in which the Company may make investments. To the fullest extent permitted by Section 122(17) of the DGCL, the Company hereby renounces any interest or expectancy of the Company to participate in any business of the Accel or Insight, as applicable, and waives any claim against a Covered Person and shall indemnify a Covered Person against any claim that such Covered Person is liable to the Company or its stockholders for breach of any fiduciary duty solely by reason of such person’s or entity’s participation in any such business. The Company shall pay in advance any expenses incurred in defense of such claim as provided in Article VI.

B. In the event that a Covered Person acquires knowledge of a potential transaction or matter which may constitute a corporate opportunity for both (x) the Covered Person, in his or her capacity with Accel or Insight, as applicable, or Accel or Insight, as applicable, and (y) the Company, the Covered Person shall not have any duty to offer or communicate information regarding such corporate opportunity to the Company. To the fullest extent permitted by Section 122(17) of the DGCL, the Company hereby renounces any interest or expectancy of the Company in such corporate opportunity and waives any claim against each Covered Person and shall indemnify a Covered Person against any claim, that such Covered Person is liable to the Company or its stockholders for breach of any fiduciary duty solely by reason of the fact that such Covered Person (i) pursues or acquires any corporate opportunity for its own account or the account of any affiliate, (ii) directs, recommends, sells, assigns, or otherwise transfers such corporate opportunity to another person or (iii) does not communicate information regarding such corporate opportunity to the Company, provided, however, in each case, that any corporate opportunity which is expressly offered to a Covered Person in writing solely in his or her capacity as an officer or director of the Company shall belong to the Company. The Company shall pay in advance any expenses incurred in defense of such claim as provided in Article VI.

6

C. For purposes of this Amended and Restated Certificate of Incorporation the following terms shall have the following meanings:

1. “Accel” means Accel, together with its subsidiaries, certain investment funds affiliated with or managed by Accel, any other investment fund or collective investment vehicle affiliated with or managed by Accel or whose general partner or managing member is owned, directly or indirectly, by Accel and (iv) any Affiliate of the foregoing (in each case, other than the Company and its subsidiaries).

2. “Affiliate” shall have the same meaning as in Rule 12b-2 under the Securities Exchange Act of 1934, as amended.

3. “Covered Person” means (x) any director or officer of the Company who is also an officer, director, employee, managing director or other affiliate of Accel or Insight, as applicable, and (y) Accel or Insight, as applicable.

4. “Insight” means each of Insight Venture Management, LLC and Insight Holdings Group, LLC, together with all investment funds affiliated with or managed by any of them, any other investment fund or collective investment vehicle affiliated with or managed by any of them or whose general partner or managing member is owned, directly or indirectly, by any of them and (iv) any Affiliate of the foregoing (in each case, other than the Company and its subsidiaries).

D. For purposes of this Article XIV, “Company” means Tenable Holdings, Inc. and includes all corporations, limited liability companies, partnerships, joint ventures, associations and other entities in which Tenable Holdings, Inc. beneficially owns (directly or indirectly) 50% or more of the outstanding voting stock, voting power, partnership interests or similar voting interests or which Tenable Holdings, Inc. otherwise controls.

E. Any person purchasing or otherwise acquiring any interest in shares of capital stock of the Company shall be deemed to have notice of and to have consented to the provisions of this Article XIV.

F. In the event of a conflict between this Article XIV and any other Article or provision of this Amended and Restated Certificate of Incorporation, this Article XIV shall prevail in all circumstances.

* * * *

7