Exhibit 3.1

STATE OF DELAWARE

CERTIFICATE OF AMENDMENT

OF THE AMENDED AND RESTATED CERTIFICATE

OF INCORPORATION

The corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware does hereby certify:

FIRST: That at a meeting of the Board of Directors of The Dun & Bradstreet Corporation (the “Company”) resolutions were duly adopted setting forth a proposed amendment of the Amended and Restated Certificate of Incorporation of the Company, declaring said amendment to be advisable and directing that the amendment proposed be considered at the next annual meeting of the stockholders of the Company. The proposed amendment adopted by the resolution of the Board of Directors amends the EIGHTH Article of the Company’s Amended and Restated Certificate of Incorporation, so that, as amended, said Article will read as follows:

EIGHTH: Any action required or permitted to be taken by the holders of the Common Stock of the corporation must be effected at a duly called annual or special meeting of such holders and may not be effected by any consent in writing by such holders. Except as otherwise required by law and subject to the rights of the holders of any series of Preferred Stock or Series Common Stock, special meetings of stockholders of the corporation may be called only by the Chief Executive Officer of the corporation or by the Board of Directors pursuant to a resolution approved by the Board of Directors, or upon the written request made in accordance with and subject to the corporation’s By-Laws by holders of record of not less than forty percent (40%) of the voting power of all outstanding shares of Common Stock of the corporation.

SECOND: That thereafter, the annual meeting of the stockholders of the Company was duly called and held upon notice in accordance with Section 222 of the General Corporation Law of the State of Delaware at which meeting the necessary number of shares as required by statute were voted in favor of the amendment.

THIRD: That said amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, said corporation has caused this certificate to be signed this 9th day of May, 2012.

AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

OF

THE DUN & BRADSTREET CORPORATION

The name of the corporation is The Dun & Bradstreet Corporation, and the original Certificate of Incorporation of the corporation was filed with the Secretary of State of the State of Delaware on April 25, 2000 under the name of The New D&B Corporation. The Certificate of Incorporation of the corporation as heretofore restated and amended is hereby further amended and restated to read in its entirety as follows:

FIRST: The name of the corporation is The Dun & Bradstreet Corporation.

SECOND: The registered office of the corporation in the State of Delaware is located at No. 1209 Orange Street, in the City of Wilmington, County of New Castle; and the name of its registered agent at such address is The Corporation Trust Company.

THIRD: The purposes of the corporation are to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware.

FOURTH: (1) The total number of shares of all classes of stock which the corporation shall have authority to issue is 220,000,000, consisting of (1) 10,000,000 shares of Preferred Stock, par value $.01 per share (“Preferred Stock”), (2) 200,000,000 shares of Common Stock, par value $.01 per share (“Common Stock”), and (3) 10,000,000 shares of Series Common Stock, par value $.01 per share (“Series Common Stock”). The number of authorized shares of any of the Preferred Stock, the Common Stock or the Series Common 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 in voting power of the stock of the corporation entitled to vote thereon irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of the State of Delaware (or any successor provision thereto), and no vote of the holders of any of the Preferred Stock, the Common Stock or the Series Common Stock voting separately as a class shall be required therefor.

(2) The Board of Directors is hereby expressly authorized, by resolution or resolutions, to provide, out of the unissued shares of Preferred Stock, for series of Preferred Stock and, with respect to each such series, to fix the number of shares constituting such series and the designation of such series, the voting powers (if any) of the shares of such series, and the preferences and relative, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series. The powers, preferences and relative, participating, optional and other special rights of each series of Preferred Stock, and the qualifications, limitations or restrictions thereof, if any, may differ from those of any and all other series at any time outstanding. Pursuant to the authority conferred upon the Board of Directors, the Board of Directors created a series of 500,000 shares of Preferred Stock designated as Series A Junior Participating Preferred Stock (the “Series A Preferred Stock”) by filing a Certificate of Designation of Series A Preferred Stock of the corporation with the Secretary of State of the State of Delaware on September 8, 2000, and created a series of 1,400,000 shares of Preferred Stock designated as Series B Preferred Stock (the “Series B Preferred Stock”) by filing a Certificate of Designation of Series B Preferred Stock of the corporation with the Secretary of State of the State of Delaware on February 24, 2009, and the

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designations, voting powers, preferences and relative, participating, optional and other special rights, and qualifications, limitations or restrictions of the Series A Preferred Stock and Series B Preferred Stock are set forth in Appendix A and Appendix B hereto, respectively, and are incorporated herein by reference.

(3) The Board of Directors is hereby expressly authorized, by resolution or resolutions, to provide, out of the unissued shares of Series Common Stock, for series of Series Common Stock and, with respect to each such series, to fix the number of shares constituting such series and the designation of such series, the voting powers (if any) of the shares of such series, and the preferences and relative, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series. The powers, preferences and relative, participating, optional and other special rights of each series of Series Common Stock, and the qualifications, limitations or restrictions thereof, if any, may differ from those of any and all other series at any time outstanding.

(4) (a) Each holder of Common Stock, as such, shall be entitled to one vote for each share of Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote; provided, however, that, except as otherwise required by law, holders of Common Stock, as such, shall not be entitled to vote on any amendment to this Amended and Restated Certificate of Incorporation (including any certificate of designations relating to any series of Preferred Stock or Series Common Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock or Series Common Stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to this Amended and Restated Certificate of Incorporation (including any certificate of designations relating to any series of Preferred Stock or Series Common Stock) or pursuant to the General Corporation Law of the State of Delaware.

(b) Except as otherwise required by law, holders of a series of Preferred Stock or Series Common Stock, as such, shall be entitled only to such voting rights, if any, as shall expressly be granted thereto by this Amended and Restated Certificate of Incorporation (including any certificate of designations relating to such series).

(c) Subject to applicable law and the rights, if any, of the holders of any outstanding series of Preferred Stock or Series Common Stock or any class or series of stock having a preference over or the right to participate with the Common Stock with respect to the payment of dividends, dividends may be declared and paid on the Common Stock at such times and in such amounts as the Board of Directors in its discretion shall determine.

(d) Upon the dissolution, liquidation or winding up of the corporation, subject to the rights, if any, of the holders of any outstanding series of Preferred Stock or Series Common Stock or any class or series of stock having a preference over or the right to participate with the Common Stock with respect to the distribution of assets of the corporation upon such dissolution, liquidation or winding up of the corporation, the holders of the Common Stock, as such, shall be entitled to receive the assets of the corporation available for distribution to its stockholders ratably in proportion to the number of shares held by them.

FIFTH: The Board of Directors shall be authorized to make, amend, alter, change, add to or repeal the By-Laws of the corporation in any manner not inconsistent with the laws of the State of Delaware, subject to the power of the stockholders to amend, alter, change, add to or repeal the By-Laws made by the Board of Directors. Notwithstanding anything contained in this

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Amended and Restated Certificate of Incorporation to the contrary, the affirmative vote of the holders of a majority of the voting power of all shares of the corporation present in person or represented by proxy and entitled to vote generally in the election of directors, voting as a single class, shall be required in order for the stockholders to alter, amend or repeal any provision of the By-laws which is to the same effect as Article Fifth, Article Seventh, and Article Eighth of this Amended and Restated Certificate of Incorporation or to adopt any provision inconsistent therewith.

SIXTH: (1) To the fullest extent permitted by the laws of the State of Delaware:

(a) The corporation shall indemnify any person (and such person’s heirs, executors or administrators) who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding (brought in the right of the corporation or otherwise), whether civil, criminal, administrative or investigative, and whether formal or informal, including appeals, by reason of the fact that such person is or was a director or officer of the corporation or, if a director or officer of the corporation, by reason of the fact that such person is or was serving at the request of the corporation as a director, officer, partner, trustee, employee or agent of another corporation, partnership, joint venture, limited liability company, trust or other enterprise, for and against all expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person or such heirs, executors or administrators in connection with such action, suit or proceeding, including appeals. Notwithstanding the preceding sentence, the corporation shall be required to indemnify a person described in such sentence in connection with any action, suit or proceeding (or part thereof) commenced by such person only if the commencement of such action, suit or proceeding (or part thereof) by such person was authorized by the Board of Directors of the corporation. The corporation may indemnify any person (and such person’s heirs, executors or administrators) who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding (brought in the right of the corporation or otherwise), whether civil, criminal, administrative or investigative, and whether formal or informal, including appeals, by reason of the fact that such person is or was an employee or agent of the corporation or is or was serving at the request of the corporation as a director, officer, partner, trustee, employee or agent of another corporation, for and against all expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person or such heirs, executors or administrators in connection with such action, suit or proceeding, including appeals.

(b) The corporation shall promptly pay expenses incurred by (i) any person whom the corporation is obligated to indemnify pursuant to the first sentence of subsection (a) of this Article Sixth, Section (1) or (ii) any person whom the corporation has determined to indemnify pursuant to the third sentence of subsection (a) of this Article Sixth, Section (1), in defending any action, suit or proceeding in advance of the final disposition of such action, suit or proceeding, including appeals, upon presentation of appropriate documentation.

(c) The corporation may purchase and maintain insurance on behalf of any person described in subsection (a) of this Article Sixth, Section (1) against any liability asserted against such person, whether or not the corporation would have the power to indemnify such person against such liability under the provisions of this Article Sixth, Section (1) or otherwise.

(d) The provisions of this Article Sixth, Section (1) shall be applicable to all actions, claims, suits or proceedings made or commenced after the adoption hereof, whether arising from acts or omissions to act occurring before or after its adoption. The provisions of this Article Sixth,

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Section (1) shall be deemed to be a contract between the corporation and each director or officer who serves in such capacity at any time while this Article Sixth, Section (1) and the relevant provisions of the laws of the State of Delaware and other applicable law, if any, are in effect, and any repeal or modification hereof shall not affect any rights or obligations then existing with respect to any state of facts or any action, suit or proceeding then or theretofore existing, or any action, suit or proceeding thereafter brought or threatened based in whole or in part on any such state of facts. If any provision of this Article Sixth, Section (1) shall be found to be invalid or limited in application by reason of any law or regulation, it shall not affect the validity of the remaining provisions hereof. The rights of indemnification provided in this Article Sixth, Section (1) shall neither be exclusive of, nor be deemed in limitation of, any rights to which an officer, director, employee or agent may otherwise be entitled or permitted by contract, this Amended and Restated Certificate of Incorporation, vote of stockholders or directors or otherwise, or as a matter of law, both as to actions in such person’s official capacity and actions in any other capacity while holding such office, it being the policy of the corporation that indemnification of any person whom the corporation is obligated to indemnify pursuant to the first sentence of subsection (a) of this Article Sixth, Section (1) shall be made to the fullest extent permitted by law.

(e) For purposes of this Article Sixth, references to “other enterprises” shall include employee benefit plans; references to “fines” shall include any excise taxes assessed on a person with respect to an employee benefit plan; and references to “serving at the request of the corporation” shall include any service as a director, officer, employee or agent of the corporation which imposes duties on, or involves services by, such director, officer, employee, or agent with respect to an employee benefit plan, its participants, or beneficiaries.

(2) A director of the corporation shall not be liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except to the extent such exemption from liability or limitation thereof is not permitted under the General Corporation Law of the State of Delaware as the same exists or may hereafter be amended. Any amendment, modification or repeal of the foregoing sentence shall not adversely affect any right or protection of a director of the corporation hereunder in respect of any act or omission occurring prior to the time of such amendment, modification or repeal.

SEVENTH: (1) The business and affairs of the corporation shall be managed by or under the direction of a Board of Directors consisting of not less than three directors, the exact number of directors to be determined from time to time by resolution adopted by affirmative vote of a majority of the Board of Directors. Directors elected at the corporation’s 2011 annual meeting of stockholders shall be elected for a term expiring at the corporation’s 2012 annual meeting of stockholders. From and after the corporation’s 2012 annual meeting of stockholders, the Board of Directors shall not be classified, and all directors shall be elected at each annual meeting of stockholders for a term expiring at the succeeding annual meeting of stockholders. A director shall hold office until his term expires and until his successor shall be elected and shall qualify, subject, however, to prior death, resignation, retirement, disqualification or removal from office. Any newly created directorship on the Board of Directors that results from an increase in the number of directors and any vacancy occurring in the Board of Directors may be filled only by a majority of the directors then in office, although less than a quorum, or by a sole remaining director. If any applicable provision of the General Corporation Law of the State of Delaware expressly confers power on stockholders to fill such a directorship at a special meeting of stockholders, such a directorship may be filled at such meeting only by the affirmative vote of

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the holders of a majority of the voting power of all shares of the corporation present in person or represented by proxy and entitled to vote generally in the election of directors, voting as a single class. Any director elected to fill a vacancy not resulting from an increase in the number of directors shall have the same remaining term as that of his predecessor. Directors may be removed only by the affirmative vote of the holders of a majority of the voting power of all shares of the corporation present in person or represented by proxy and entitled to vote generally in the election of directors, voting as a single class.

(2) Notwithstanding the foregoing, whenever the holders of any one or more series of Preferred Stock or Series Common Stock issued by the corporation shall have the right, voting separately as a series or separately as a class with one or more such other series, to elect directors at an annual or special meeting of stockholders, the election, term of office, removal, filling of vacancies and other features of such directorships shall be governed by the terms of this Amended and Restated Certificate of Incorporation (including any certificate of designations relating to any series of Preferred Stock or Series Common Stock) applicable thereto, and such directors so elected shall not be divided into classes pursuant to this Article Seventh unless expressly provided by such terms.

EIGHTH: Any action required or permitted to be taken by the holders of the Common Stock of the corporation must be effected at a duly called annual or special meeting of such holders and may not be effected by any consent in writing by such holders. Except as otherwise required by law and subject to the rights of the holders of any series of Preferred Stock or Series Common Stock, special meetings of stockholders of the corporation may be called only by the Chief Executive Officer of the corporation or by the Board of Directors pursuant to a resolution approved by the Board of Directors.

NINTH: Notwithstanding anything contained in this Amended and Restated Certificate of Incorporation to the contrary, the affirmative vote of the holders of a majority of the voting power of all shares of the corporation present in person or represented by proxy and entitled to vote generally in the election of directors, voting as a single class, shall be required to alter, amend or repeal Article Fifth, Article Seventh, Article Eighth or this Article Ninth or to adopt any provision inconsistent therewith.

The Dun & Bradstreet Corporation does hereby further certify that this Amended and Restated Certificate of Incorporation was duly adopted by the stockholders in accordance with the provisions of Sections 242 and 245 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, The Dun & Bradstreet Corporation has caused its corporate seal to be hereunto affixed and this certificate to be signed by Jeffrey S. Hurwitz, its Senior Vice President, General Counsel and Corporate Secretary, this 6th day of May, 2011.

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Appendix A

CERTIFICATE OF DESIGNATION

OF

SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

OF

The New D&B Corporation

(Pursuant to Section 151 of the

General Corporation Law of the State of Delaware)

The New D&B Corporation, a corporation organized and existing under the General Corporation Law of the State of Delaware (hereinafter called the “Company”), hereby certifies that the following resolution was duly adopted by the Board of Directors of the Company as required by Section 151 of the General Corporation Law of the State of Delaware on August 15, 2000.

RESOLVED, that, pursuant to the authority vested in the Board of Directors in accordance with the provisions of its Amended and Restated Certificate of Incorporation as approved on the date hereof by the Board of Directors, and subject to the Amended and Restated Certificate of Incorporation becoming effective in accordance with the General Corporation Law of the State of Delaware, the Board of Directors does hereby create, authorize and provide for the issuance of a series of preferred stock to be designated as the “Series A Junior Participating Preferred Stock,” having the designation, number of shares, voting powers, preferences and other special rights, and qualifications, limitations and restrictions that are set forth in the Certificate of Designation of Series A Junior Participating Preferred Stock (the “Certificate of Designation”), a copy of which has been presented to the Board of Directors;

and hereby states the designation and number of shares, and fixes the relative rights, powers and preferences of the Series A Junior Participating Preferred Stock, and the qualifications, limitations and restrictions thereof, as follows:

Section 1. Designation and Amount. The shares of such series shall be designated as “Series A Junior Participating Preferred Stock” (the “Series A Preferred Stock”) and the number of shares constituting the Series A Preferred Stock shall be 500,000. Such number of shares may be increased or decreased by resolution of the Board of Directors; provided, that no decrease shall reduce the number of shares of Series A Preferred Stock to a number less than the number of shares then outstanding plus the number of shares reserved for issuance upon the exercise of outstanding options, rights or warrants or upon the conversion of any outstanding securities issued by the Company convertible into Series A Preferred Stock.

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Section 2. Dividends and Distributions.

(A) Subject to the rights of the holders of any shares of any series of Preferred Stock of the Company (the “Preferred Stock”) (or any similar stock) ranking prior and superior to the Series A Preferred Stock with respect to dividends, the holders of shares of Series A Preferred Stock, in preference to the holders of Common Stock, par value $.01 per share, of the Company (the “Common Stock”) and of any other stock of the Company ranking junior to the Series A Preferred Stock, shall be entitled to receive, when, as and if declared by the Board of Directors out of funds legally available for the purpose, quarterly dividends payable in cash on the last day of January, April, July, and October in each year (each such date being referred to herein as a “Dividend Payment Date”), commencing on the first Dividend Payment Date after the first issuance of a share or fraction of a share of Series A Preferred Stock (the “Issue Date”), in an amount per share (rounded to the nearest cent) equal to the greater of (a) $10 or (b) subject to the provision for adjustment hereinafter set forth, 1000 times the aggregate per share amount of all cash dividends, and 1000 times the aggregate per share amount (payable in kind) of all non-cash dividends or other distributions other than a dividend payable in shares of Common Stock, declared on the Common Stock since the immediately preceding Dividend Payment Date or, with respect to the first Dividend Payment Date, since the first issuance of any share or fraction of a share of Series A Preferred Stock. In the event the Company shall at any time after the Issue Date declare and pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under clause (b) of the preceding sentence shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

(B) The Company shall declare a dividend or distribution on the Series A Preferred Stock as provided in paragraph (A) of this Section immediately after it declares a dividend or distribution on the Common Stock (other than a dividend payable in shares of Common Stock); provided that, in the event no dividend or distribution shall have been declared on the Common Stock during the period between any Dividend Payment Date and the next subsequent Dividend Payment Date, a dividend of $10 per share on the Series A Preferred Stock shall nevertheless be payable, when, as and if declared, on such subsequent Dividend Payment Date.

(C) Dividends shall begin to accrue and be cumulative, whether or not earned or declared, on outstanding shares of Series A Preferred Stock from the Dividend Payment Date next preceding the date of issue of such shares, unless the date of issue of such shares is prior to the record date for the first Dividend Payment Date, in which case dividends on such shares shall begin to accrue from the date of issue of such shares, or unless the date of issue is a Dividend Payment Date or is a date after the record date for the determination of holders of shares of Series A Preferred Stock entitled to receive a quarterly dividend and before such Dividend Payment Date, in either of which events such dividends shall begin to accrue and be cumulative from such

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Dividend Payment Date. Accrued but unpaid dividends shall not bear interest. Dividends paid on the shares of Series A Preferred Stock in an amount less than the total amount of such dividends at the time accrued and payable on such shares shall be allocated pro rata on a share-by-share basis among all such shares at the time outstanding. The Board of Directors may fix a record date for the determination of holders of shares of Series A Preferred Stock entitled to receive payment of a dividend or distribution declared thereon, which record date shall be not more than 60 days prior to the date fixed for the payment thereof.

Section 3. Voting Rights. The holders of shares of Series A Preferred Stock shall have the following voting rights;

(A) Subject to the provision for adjustment hereinafter set forth and except as otherwise provided in the Certificate of Incorporation or required by law, each share of Series A Preferred Stock shall entitle the holder thereof to 1000 votes on all matters upon which the holders of the Common Stock of the Company are entitled to vote. In the event the Company shall at any time after the Issue Date declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the number of votes per share to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event shall be adjusted by multiplying such number by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

(B) Except as otherwise provided herein, in the Certificate of Incorporation or in any other Certificate of Designations creating a series of Preferred Stock or any similar stock, and except as otherwise required by law, the holders of shares of Series A Preferred Stock and the holders of shares of Common Stock and any other capital stock of the Company having general voting rights shall vote together as one class on all matters submitted to a vote of stockholders of the Company.

(C) Except as set forth herein, or as otherwise provided by law, holders of Series A Preferred Stock shall have no special voting rights and their consent shall not be required (except to the extent they are entitled to vote with holders of Common Stock as set forth herein) for taking any corporate action.

(D) If, at the time of any annual meeting of stockholders for the election of directors, the equivalent of six quarterly dividends (whether or not consecutive) payable on any share or shares of Series A Preferred Stock are in default, the number of directors constituting the Board of Directors of the Company shall be increased by two. In addition to voting together with the holders of Common Stock for the election of other directors of the Company, the holders of record of the Series A Preferred Stock, voting separately as a class to the exclusion of the holders of Common Stock, shall be entitled at said meeting of stockholders (and at each subsequent annual meeting of stockholders), unless all

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dividends in arrears on the Series A Preferred Stock have been paid or declared and set apart for payment prior thereto, to vote for the election of two directors of the Company, the holders of any Series A Preferred Stock being entitled to cast a number of votes per share of Series A Preferred Stock as is specified in paragraph (A) of this Section 3. Each such additional director shall not be a member of Class I, Class II or Class III of the Board of Directors of the Company, but shall serve until the next annual meeting of stockholders for the election of directors, or until his successor shall be elected and shall qualify, or until his right to hold such office terminates pursuant to the provisions of this Section 3(D). Until the default in payments of all dividends which permitted the election of said directors shall cease to exist, any director who shall have been so elected pursuant to the provisions of this Section 3(D) may be removed at any time, without cause, only by the affirmative vote of the holders of the shares of Series A Preferred Stock at the time entitled to cast a majority of the votes entitled to be cast for the election of any such director at a special meeting of such holders called for that purpose, and any vacancy thereby created may be filled by the vote of such holders. If and when such default shall cease to exist, the holders of the Series A Preferred Stock shall be divested of the foregoing special voting rights, subject to revesting in the event of each and every subsequent like default in payments of dividends. Upon the termination of the foregoing special voting rights, the terms of office of all persons who may have been elected directors pursuant to said special voting rights shall forthwith terminate, and the number of directors constituting the Board of Directors shall be reduced by two. The voting rights granted by this Section 3(D) shall be in addition to any other voting rights granted to the holders of the Series A Preferred Stock in this Section 3.

Section 4. Certain Restrictions.

(A) Whenever quarterly dividends or other dividends or distributions payable on the Series A Preferred Stock as provided in Section 2 are in arrears, thereafter and until all accrued and unpaid dividends and distributions, whether or not earned or declared, on shares of Series A Preferred Stock outstanding shall have been paid in full, the Company shall not:

(i) declare or pay dividends, or make any other distributions, on any shares of stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series A Preferred Stock;

(ii) declare or pay dividends, or make any other distributions, on any shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series A Preferred Stock, except dividends paid ratably on the Series A Preferred Stock and all such parity stock on which dividends are payable or in arrears in proportion to the total amounts to which the holders of all such shares are then entitled;

(iii) redeem or purchase or otherwise acquire for consideration shares of any stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series A Preferred Stock, provided that the Company may at

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any time redeem, purchase or otherwise acquire shares of any such junior stock in exchange for shares of any stock of the Company ranking junior (as to dividends and upon dissolution, liquidation or winding up) to the Series A Preferred Stock or rights, warrants or options to acquire such junior stock;

(iv) redeem or purchase or otherwise acquire for consideration any shares of Series A Preferred Stock, or any shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series A Preferred Stock, except in accordance with a purchase offer made in writing or by publication (as determined by the Board of Directors) to all holders of such shares upon such terms as the Board of Directors, after consideration of the respective annual dividend rates and other relative rights and preferences of the respective series and classes, shall determine in good faith will result in fair and equitable treatment among the respective series or classes.

(B) The Company shall not permit any subsidiary of the Company to purchase or otherwise acquire for consideration any shares of stock of the Company unless the Company could, under paragraph (A) of this Section 4, purchase or otherwise acquire such shares at such time and in such manner.

Section 5. Reacquired Shares. Any shares of Series A Preferred Stock purchased or otherwise acquired by the Company in any manner whatsoever shall be retired and cancelled promptly after the acquisition thereof. All such shares shall upon their retirement become authorized but unissued shares of Preferred Stock and may be reissued as part of a new series of Preferred Stock to be created by resolution or resolutions of the Board of Directors, subject to any conditions and restrictions on issuance set forth herein.

Section 6. Liquidation, Dissolution or Winding Up. Upon any liquidation, dissolution or winding up of the Company, no distribution shall be made (A) to the holders of the Common Stock or of shares of any other stock of the Company ranking junior, upon liquidation, dissolution or winding up, to the Series A Preferred Stock unless, prior thereto, the holders of shares of Series A Preferred Stock shall have received $100 per share, plus an amount equal to accrued and unpaid dividends and distributions thereon, whether or not earned or declared, to the date of such payment, provided that the holders of shares of Series A Preferred Stock shall be entitled to receive an aggregate amount per share, subject to the provision for adjustment hereinafter set forth, equal to 1000 times the aggregate amount to be distributed per share to holders of shares of Common Stock, or (B) to the holders of shares of stock ranking on a parity upon liquidation, dissolution or winding up with the Series A Preferred Stock, except distributions made ratably on the Series A Preferred Stock and all such parity stock in proportion to the total amounts to which the holders of all such shares are entitled upon such liquidation, dissolution or winding up. In the event, however, that there are not sufficient assets available to permit payment in full of the Series A liquidation preference and the liquidation preferences of all other classes and series of stock of the Company, if any, that rank on a parity with the Series A Preferred Stock in respect thereof, then the assets available for such distribution shall be distributed ratably to the holders of the Series A Preferred Stock and the holders of such parity shares in the proportion to their respective liquidation preferences. In the event the Company

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shall at any time after the Issue Date declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the aggregate amount to which holders of shares of Series A Preferred Stock were entitled immediately prior to such event under the proviso in clause (A) of the preceding sentence shall be adjusted by multiplying such amount by a fraction the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

Neither the merger or consolidation of the Company into or with another entity nor the merger or consolidation of any other entity into or with the Company (nor the sale of all or substantially all of the assets of the Company) shall be deemed to be a liquidation, dissolution or winding up of the Company within the meaning of this Section 6.

Section 7. Consolidation, Merger, etc. In case the Company shall enter into any consolidation, merger, combination or other transaction in which the shares of Common Stock are converted into, exchanged for or changed into other stock or securities, cash and/or any other property, then in any such case each share of Series A Preferred Stock shall at the same time be similarly converted into, exchanged for or changed into an amount per share (subject to the provision for adjustment hereinafter set forth) equal to 1000 times the aggregate amount of stock, securities, cash and/or any other property (payable in kind), as the case may be, into which or for which each share of Common Stock is converted, exchanged or converted. In the event the Company shall at any time after the Issue Date declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the amount set forth in the preceding sentence with respect to the conversion, exchange or change of shares of Series A Preferred Stock shall be adjusted by multiplying such amount by a fraction, the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

Section 8. No Redemption. The shares of Series A Preferred Stock shall not be redeemable from any holder.

Section 9. Rank. The Series A Preferred Stock shall rank, with respect to the payment of dividends and the distribution of assets upon liquidation, dissolution or winding up of the Company, junior to all other series of Preferred Stock and senior to the Common Stock.

Section 10. Amendment. If any proposed amendment to the Certificate of Incorporation (including this Certificate of Designations) would alter, change or repeal any of the preferences, powers or special rights given to the Series A Preferred Stock so as to affect the Series A Preferred Stock adversely, then the holders of the Series A Preferred Stock shall be entitled to vote separately as a class upon such amendment, and the affirmative vote of two-thirds

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of the outstanding shares of the Series A Preferred Stock, voting separately as a class, shall be necessary for the adoption thereof, in addition to such other vote as may be required by the General Corporation Law of the State of Delaware.

Section 11. Fractional Shares. Series A Preferred Stock may be issued in fractions of a share that shall entitle the holder, in proportion to such holder’s fractional shares, to exercise voting rights, receive dividends, participate in distributions and to have the benefit of all other rights of holders of Series A Preferred Stock.

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IN WITNESS WHEREOF, this Certificate of Designations is executed on behalf of the Company by its V.P. & Treasurer and attested by its Secretary this 5th day of September, 2000.

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Appendix B

THE DUN & BRADSTREET CORPORATION

CERTIFICATE OF DESIGNATION

OF

SERIES B PREFERRED STOCK

Pursuant to Section 151 of the

General Corporation Law of the State of Delaware

The Dun & Bradstreet Corporation, a Delaware corporation (the “Company”), does hereby certify that, pursuant to Section 151 of the General Corporation Law of the State of Delaware, the following resolution was duly adopted by the Board of Directors of the Company (the “Board of Directors”):

RESOLVED, that pursuant to the authority vested in the Board of Directors in accordance with the provisions of the Restated Certificate of Incorporation of the Company, in connection with an intercompany transaction with a wholly-owned subsidiary in exchange for outstanding intercompany debt, the Board of Directors does hereby create and designate a series of preferred stock of the Company, par value $.01 per share, and the Board of Directors does hereby fix the relative rights and preferences of the shares of such series as follows:

1. Designation and Amount. The shares of such series of preferred stock shall be designated as the “Series B Preferred Stock” (the “Series B Preferred Stock”) and the number of shares constituting the Series B Preferred Stock shall be 1,400,000.

2. Dividends. (a) Rate and Payment. The holders of shares of Series B Preferred Stock shall be entitled to receive, when, as and if declared by the Board of Directors or any duly authorized committee of the Board of Directors, in its sole discretion, out of funds legally available for payment of dividends under the Delaware General Corporation Law, dividends at the annual rate of 4.0% applied to the Liquidation Preference (as defined below) per share of the Series B Preferred Stock. Such dividends shall accrue and be cumulative, whether or not declared, from the date of issuance of the Series B Preferred Stock. The first dividend shall be payable, but only when, as and if declared by the Board of Directors or a duly authorized committee of the Board of Directors, on March 3, 2010 (the “Initial Dividend Payment Date”), for the period from the date of issuance of the Series B Preferred Stock through March 3, 2010 (the “Initial Dividend Period”). After the Initial Dividend Period, dividends shall be payable quarterly in arrears, but only when, as and if declared by the Board of Directors or a duly authorized committee of the Board of Directors, on each of March 3, June 3, September 3 and

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December 3 of each year (each, a “Quarterly Dividend Payment Date”), commencing on June 3, 2010; provided that if any such Quarterly Dividend Payment Date would otherwise occur on a day that is not a Business Day (as defined below), such Quarterly Dividend Payment Date shall instead be (and any dividend payable on Series B Preferred Stock on such Quarterly Dividend Payment Date shall instead be payable on) the next succeeding Business Day with the same force and effect as if made on the original Quarterly Dividend Payment Date, and no additional dividends, interest or other amounts shall accrue on the amount so payable from such date to such next succeeding Business Day. A Business Day is a day other than (i) a Saturday or Sunday; (ii) a day on which banks in New York, New York are authorized or obligated by law or executive order to remain closed; or (iii) a day on which the Company’s principal executive office is closed for business. The period from and including any Quarterly Dividend Payment Date to, but excluding, the next Quarterly Dividend Payment Date is a “Dividend Period.” Dividends may be paid in cash, additional shares of Series B Preferred Stock, or any combination thereof, at the Company’s discretion. If the Company elects to make any dividend payment, or any portion thereof, in shares of Series B Preferred Stock, such shares shall be valued for such purpose at $1,000 per share. Dividends will cease to become payable by the Company on the Series B Preferred Stock on the Mandatory Redemption Date (as defined below). If at any time the Company pays less than the total amount of dividends then accrued with respect to the Series B Preferred Stock, such payment shall be distributed pro rata among the holders thereof based on the aggregate accrued but unpaid dividends on the shares of Series B Preferred Stock held by each such holder. If the Company fails to pay a dividend on the Series B Preferred Stock, dividends on the Series B Preferred Stock shall continue to accrue and cumulate at an annual rate of 4.0% applied to the Liquidation Preference.

(b) Priority of Dividends. So long as any share of the Series B Preferred Stock remains outstanding, unless full dividends on all outstanding shares of Series B Preferred Stock have been paid on the Initial Dividend Payment Date or the applicable Quarterly Dividend Payment Date, whether in cash or in kind, the Company shall not, and shall cause its subsidiaries not to, pay any dividend on, make any distributions relating to, or redeem, purchase, acquire (either directly or through any subsidiary) or make a liquidation payment relating to, any Common Stock, or make any guarantee payment with respect thereto, other than:

(i) purchases, redemptions or other acquisitions of shares of Common Stock in connection with any employment contract, benefit plan or other similar arrangement with or for the benefit of employees, officers, directors or consultants;

(ii) purchases of shares of Common Stock pursuant to a contractually binding requirement to buy stock existing prior to the commencement of the then-current dividend period, including under a contractually binding stock repurchase plan;

(iii) as a result of an exchange or conversion of any class or series of Common Stock, or the securities of another company, for any other class or series of Common Stock;

(iv) the purchase of fractional interests in shares of Common Stock pursuant to the conversion or exchange provisions of such Common Stock or the security being converted or exchanged; or

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(v) the payment of any dividends in respect of Common Stock where the dividend is in the form of the same stock as that on which the dividend is being paid.

Subject to the foregoing, such dividends payable in cash, stock or otherwise, as may be determined by the Board of Directors, or any duly authorized committee thereof, may be declared and paid on any Common Stock from time to time out of any assets legally available for such payment, and holders of the Series B Preferred Stock will not be entitled to participate in those dividends.

3. Liquidation Preference. (a) Liquidation. Upon any liquidation, dissolution or winding up of the affairs of the Company (a “Liquidation”), voluntary or otherwise, the holders of the Series B Preferred Stock shall be entitled to receive in preference to the holders of Common Stock an amount equal to $1,000 per share (the “Liquidation Preference”) plus any accrued and unpaid dividends thereon, whether or not declared, to the date of such payment.

(b) Partial Payment. If upon Liquidation, the assets of the Company are not sufficient to pay in full the Liquidation Preference plus any accrued and unpaid dividends thereon to all holders of the Series B Preferred Stock, the amounts paid to the holders of Series B Preferred Stock shall be distributed pro rata in accordance with the respective aggregate Liquidation Preferences of the holders of Series B Preferred Stock.

(c) Residual Distributions. After setting apart or paying in full the Liquidation Preference, the holders of Common Stock shall be entitled to receive all remaining assets of the Company (or proceeds thereof).

(d) Merger, Consolidation and Sale of Assets Not Liquidation. For purposes of this section, the merger or consolidation of the Company with or into any other corporation or other entity, including a merger or consolidation in which the holders of Series B Preferred Stock receive cash, securities or other property for their shares, or the sale, lease or exchange (for cash, securities or other property) of all or substantially all of the assets of the Company, shall not constitute a Liquidation.

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4. Mandatory Redemption. On February 24, 2019 (the “Mandatory Redemption Date”), the Company shall be obligated to redeem for cash all outstanding shares of Series B Preferred Stock at a redemption price per share of Series B Preferred Stock equal to the Liquidation Preference plus accrued and unpaid dividends thereon.

5. Voting Rights. No holder of outstanding shares of Series B Preferred Stock shall be entitled to notice of any stockholder’s meeting or to vote with respect to any matter presented to the stockholders of the Company for their action or consideration, except as provided below or as provided by law.

6. Protective Provisions. So long as any shares of Series B Preferred Stock are outstanding, this Company shall not, without obtaining the approval (by vote or written consent) of the holders of at least a majority of the then outstanding shares of Series B Preferred Stock, alter or change the rights, preferences, privileges or restrictions provided for the benefit of the Series B Preferred Stock.

7. Amendment; Waiver. Except as expressly prohibited by law, this Certificate of Designation may be amended and any provision herein may be waived with the approval of the holders of a majority of the Series B Preferred Stock and the Board of Directors. Any amendment or waiver so effected shall be binding upon each holder of Series B Preferred Stock.

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IN WITNESS WHEREOF, this Certificate of Designation has been executed on behalf of the Company as of the 23rd day of February, 2009.

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