Exhibit 3.1

Execution Version

CERTIFICATE OF AMENDMENT OF

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF COMSCORE, INC.

comScore, Inc. (the “Corporation”), a 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 (the “Board”) of the Corporation, resolutions were duly adopted setting forth a proposed amendment (the “Amendment”) of the Amended and Restated Certificate of Incorporation of the Corporation, declaring the Amendment to be advisable and submitting the Amendment at a meeting of the stockholders of the Corporation for consideration thereof.

SECOND: That thereafter, pursuant to resolutions of the Board, a special meeting of stockholders of the Corporation was duly called and held on March 9, 2021, upon notice in accordance with Section 222 of the General Corporation Law of the State of Delaware and at which meeting the necessary number of shares as required by statute and the Amended and Restated Certificate of Incorporation of the Corporation were voted in favor of approval of the Amendment.

THIRD: That Section A.1 of Article IV of the Amended and Restated Certificate of Incorporation of the Corporation is hereby amended and restated in full as follows:

A. Capital Stock.

1. This Corporation is authorized to issue two classes of stock, to be designated, respectively, “Common Stock” and “Preferred Stock.” The total number of shares which the Corporation is authorized to issue is 365,000,000 shares. 275,000,000 shares shall be Common Stock, par value $0.001 per share, and 90,000,000 shares shall be Preferred Stock, par value $0.001 per share.

FOURTH: That a new Section C of Article IV of the Amended and Restated Certificate of Incorporation of the Corporation is hereby inserted in full as follows:

C. Blank-Check Preferred Stock. Preferred Stock may be issued from time to time in one or more classes or series, the shares of each class or series to have such designations and powers, preferences and rights, and qualifications, limitations and restrictions thereof, as are stated and expressed herein and in the resolution or resolutions providing for the issue of such class or series adopted by the Board of Directors as hereafter prescribed. Authority is hereby expressly granted to the Board of Directors to authorize the issuance of Preferred Stock from time to time in one or more classes or series, and with respect to each series of Preferred Stock, to fix by resolution or resolutions from time to time adopted by the Board of Directors providing for the issuance thereof the designation, and the powers, preferences, privileges, rights, qualifications, limitations and restrictions relating to each series of Preferred Stock, including but not limited to, the following:

(i) whether or not the class or series is to have voting rights, full, special or limited, or is to be without voting rights, and whether or not such series is to be entitled to vote as a separate class or series either alone or together with the holders of one or more other classes or series of stock;

(ii) the number of shares to constitute the class or series and the designations thereof;

(iii) the powers, preferences, privileges and relative, participating, optional or other special rights, if any, and the qualifications, limitations or restrictions thereof, if any, with respect to any series;

1

(iv) whether or not the shares of any class or series shall be redeemable at the option of the Corporation or the holders thereof or upon the happening of any specified event, and, if redeemable, the redemption price or prices (which may be payable in the form of cash, notes, securities or other property), and the time or times at which, and the terms and conditions upon which, such shares shall be redeemable and the manner of redemption;

(v) whether or not the shares of a series shall be subject to the operation of retirement or sinking funds to be applied to the purchase or redemption of such shares for retirement, and, if such retirement or sinking fund or funds are to be established, the annual amount thereof, and the terms and provisions relative to the operation thereof;

(vi) the dividend rate, whether dividends are payable in cash, stock of the Corporation or other property, the conditions upon which and the times when such dividends are payable, the preference to or the relation to the payment of dividends payable on any other class or classes or series of stock, whether or not such dividends shall be cumulative or noncumulative, and if cumulative, the date or dates from which such dividends shall accumulate;

(vii) the preferences, if any, and the amounts thereof which the holders of any class or series thereof shall be entitled to receive upon the voluntary or involuntary liquidation, dissolution or winding up of, or upon any distribution of the assets of, the Corporation;

(viii) whether or not the shares of any class or series, at the option of the Corporation or the holder thereof or upon the happening of any specified event, shall be convertible into or exchangeable for, the shares of any other class or classes or of any other series of the same or any other class or classes or series, of stock, securities or other property of the Corporation and the conversion price or prices or ratio or ratios or the rate or rates at which such exchange may be made, with such adjustments, if any, as shall be stated and expressed or provided for in such resolution or resolutions; and

(ix) such other powers, privileges, preferences, rights, qualifications, limitations and restrictions with respect to any series as may to the Board of Directors seem advisable.

The shares of each series of Preferred Stock may vary from the shares of any other class or series thereof in any or all of the foregoing respects.

FIFTH: That the Amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.

2

IN WITNESS WHEREOF, the Corporation has caused this Certificate of Amendment to be signed by an authorized officer of the Corporation this 10th day of March, 2021.

3