Exhibit 3.4

CYRUSONE FINANCE CORP.

ARTICLES OF INCORPORATION

THIS IS TO CERTIFY THAT:

FIRST: The undersigned, Thomas W. Bosse, whose address is c/o The Law Offices of Thomas W. Bosse, PLLC, 533 Centre View Boulevard, Crestview Hills, Kentucky 41017, being at least 18 years of age, does hereby form a corporation under the general laws of the State of Maryland.

SECOND: The name of the corporation (the “Corporation”) is:

CyrusOne Finance Corp.

THIRD: The purposes for which the Corporation is formed are to engage in any lawful act or activity for which corporations may be organized under the general laws of the State of Maryland as now or hereafter in force.

FOURTH: The address of the principal office of the Corporation in the State of Maryland is c/o CSC-Lawyers Incorporating Service Company, 7 St. Paul Street, Suite 1660, Baltimore, Maryland 21202. The name and address of the resident agent of the Corporation in the State of Maryland are CSC-Lawyers Incorporating Service Company, 7 St. Paul Street, Suite 1660, Baltimore, Maryland 21202. The resident agent is a Maryland corporation.

FIFTH: (a) The Corporation has authority to issue 1,000 shares of stock, consisting of 1,000 shares of common stock, $0.01 par value per share. The aggregate par value of all authorized shares of stock having par value is $10.00. The Board of Directors, with the approval of a majority of the entire Board and without any action by the stockholders of the Corporation, may amend the charter of the Corporation (the “Charter”) from time to time to increase or decrease the aggregate number of shares of stock or the number of shares of stock of any class or series that the Corporation has authority to issue.

(b) The Board of Directors may reclassify any unissued shares of stock of the Corporation from time to time in one or more classes or series of stock. If shares of one class of stock are classified or reclassified into shares of another class of stock pursuant to this Article FIFTH, the number of authorized shares of the former class shall be automatically decreased and the number of shares of the latter class shall be automatically increased, in each case by the number of shares so classified or reclassified, so that the aggregate number of shares of stock of all classes that the Corporation has authority to issue shall not be more than the total number of shares of stock set forth in the first sentence of paragraph (a) of this Article FIFTH.

(c) The rights of all stockholders and the terms of all stock are subject to the provisions of the Charter and the Bylaws. The Board of Directors of the Corporation shall have the exclusive power to make, alter, amend or repeal the Bylaws.

SIXTH: The business and affairs of the Corporation shall be managed under the direction of the Board of Directors. The number of directors of the Corporation shall initially be two, which number may be increased or decreased pursuant to the Bylaws of the Corporation (the “Bylaws”), but shall never be less than the minimum number required by the Maryland General Corporation Law (the “MGCL”). The names of the directors who shall serve until the first annual meeting of stockholders and until their successors are duly elected and qualify are:

John F. Cassidy

Gary Wojtaszek

The Board of Directors may increase the number of directors and may fill any vacancy, whether resulting from an increase in the number of directors or otherwise, on the Board of Directors in the manner provided in the Bylaws.

SEVENTH: (a) The Board of Directors may authorize the issuance from time to time of shares of stock of the Corporation of any class or series, whether now or hereafter authorized, or securities or rights convertible into shares of its stock of any class or series, whether now or hereafter authorized, for such consideration as the Board of Directors may deem advisable (or without consideration in the case of a stock split or stock dividend), subject to such restrictions or limitations, if any, as may be set forth in the Charter or the Bylaws.

(b) The determination as to any of the following matters, made in good faith by or pursuant to the direction of the Board of Directors consistent with the Charter, shall be final and conclusive and shall be binding upon the Corporation and every holder of shares of its stock: the amount of the net income of the Corporation for any period and the amount of assets at any time legally available for the payment of dividends, redemption of its stock or the payment of other distributions on its stock; the amount of paid-in surplus, net assets, other surplus, annual or other cash flow, funds from operations, net profit, net assets in excess of capital, undivided profits or excess of profits over losses on sales of assets; the amount, purpose, time of creation, increase or decrease, alteration or cancellation of any reserves or charges and the propriety thereof (whether or not any obligation or liability for which such reserves or charges shall have been created shall have been paid or discharged); any interpretation of the terms, preferences, conversion or other rights, voting powers or rights, restrictions, limitations as to dividends or other distributions, qualifications or terms or conditions of redemption of any class or series of stock of the Corporation; the fair value, or any sale, bid or asked price to be applied in determining the fair value, of any asset owned or held by the Corporation or of any shares of stock of the Corporation; the number of shares of stock of any class of the Corporation; any matter relating to the acquisition, holding and disposition of any assets by the Corporation; or any other matter relating to the business and affairs of the Corporation or required or permitted by applicable law, the Charter or Bylaws or otherwise to be determined by the Board of Directors.

(c) No holder of shares of stock of any class shall have any preemptive right to subscribe for or to purchase any additional shares of any class, or any bonds or convertible securities of any nature; provided, however, that the Board of Directors may, by contract or otherwise, confer any preemptive right that the Board of Directors may deem

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advisable in connection with such issuance. Holders of shares of stock shall not be entitled to exercise any rights of an objecting stockholder provided for under Title 3, Subtitle 2 of the MGCL or any successor statute unless the Board of Directors, upon the affirmative vote of a majority of the Board of Directors, shall determine that such rights apply, with respect to all or any classes or series of stock, to one or more transactions occurring after the date of such determination in connection with which holders of such shares would otherwise be entitled to exercise such rights.

(d) Notwithstanding any provision of law permitting or requiring any action to be taken or approved by the affirmative vote of the holders of shares entitled to cast a greater number of votes, any such action shall be effective and valid if declared advisable by the Board of Directors and taken or approved by the affirmative vote of holders of shares entitled to cast a majority of all the votes entitled to be cast on the matter.

(e) Any action required or permitted to be taken at any meeting of stockholders may be taken without a meeting if a consent in writing or by electronic transmission of stockholders entitled to cast not less than the minimum number of votes that would be necessary to authorize or take the action at a meeting of stockholders is delivered to the Corporation in accordance with the MGCL.

EIGHTH: The Corporation reserves the right from time to time to make any amendment to its Charter, now or hereafter authorized by law, including any amendment altering the terms or contract rights, as expressly set forth in the Charter, of any shares of outstanding stock. All rights and powers conferred by the Charter on stockholders, directors and officers are granted subject to this reservation.

NINTH: (a) To the maximum extent that Maryland law in effect from time to time permits limitation of the liability of directors and officers of a corporation, no present or former director or officer of the Corporation shall be liable to the Corporation or its stockholders for money damages.

(b) To the maximum extent permitted by Maryland law in effect from time to time, the Corporation shall indemnify and, without requiring a preliminary determination of the ultimate entitlement to indemnification, shall pay or reimburse reasonable expenses in advance of final disposition of a proceeding to (a) any individual who is a present or former director or officer of the Corporation and (b) any individual who, while a director or officer of the Corporation and at the request of the Corporation, serves or has served as a director, officer, partner, member, manager or trustee of another corporation, real estate investment trust, partnership, joint venture, limited liability company, trust, employee benefit plan or other enterprise, in either case, who is made or threatened to be made a party to the proceeding by reason of his or her service in that capacity. The rights to indemnification and advance of expenses provided by the Charter shall vest immediately upon the election or appointment of a director or officer. The Corporation shall have the power, with the approval of the Board of Directors, to provide such indemnification and advancement of expenses to an individual who served a predecessor of the Corporation in any of the capacities described in (a) or (b) above and to any employee or agent of the Corporation or a predecessor of the Corporation.

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(c) Neither the amendment nor repeal of this Article NINTH, nor the adoption or amendment of any other provision of the Charter or the Bylaws inconsistent with this Article NINTH, shall apply to or affect in any respect the applicability of the preceding paragraph with respect to any act or failure to act which occurred prior to such amendment, repeal or adoption.

- Signature Page Follows -

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IN WITNESS WHEREOF, I have signed these Articles of Incorporation and acknowledge the same to be my act on this 31st day of October, 2012.

/s/ Thomas W. Bosse

Thomas W. Bosse

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