Exhibit 3.1

NUVVE HOLDING CORP.

CERTIFICATE OF DESIGNATION OF PREFERENCES,
RIGHTS AND LIMITATIONS
OF
SERIES B CONVERTIBLE PREFERRED STOCK

PURSUANT TO SECTION 151 OF THE
DELAWARE GENERAL CORPORATION LAW

The undersigned, Gregory Poilasne and David Robson, do hereby certify that:

1. They are the Chief Executive Officer and Secretary, respectively, of Nuvve Holding Corp., a Delaware corporation (the “Corporation”).

2. The Corporation is authorized to issue 1,000,000 shares of preferred stock, 35,000 of which have been issued.

3. The following resolutions were duly adopted by the board of directors of the Corporation (the “Board of Directors”):

WHEREAS, the certificate of incorporation of the Corporation provides for a class of its authorized stock known as preferred stock, consisting of 1,000,000 shares, $0.0001 par value per share, issuable from time to time in one or more series;

WHEREAS, the Board of Directors is authorized to fix the dividend rights, dividend rate, voting rights, conversion rights, rights and terms of redemption and liquidation preferences of any wholly unissued series of preferred stock and the number of shares constituting any series and the designation thereof, of any of them; and

WHEREAS, it is the desire of the Board of Directors, pursuant to its authority as aforesaid, to fix the rights, preferences, restrictions and other matters relating to a new series of the preferred stock, which shall consist of, except as otherwise set forth in the Cooperation Agreement, up to 150,000 shares of Series B Convertible Preferred Stock, par value $0.0001 per share, which the Corporation has the authority to issue, as follows:

NOW, THEREFORE, BE IT RESOLVED, that the Board of Directors does hereby provide for the issuance of a series of preferred stock for cash or exchange of other securities, rights or property and does hereby fix and determine the rights, preferences, restrictions and other matters relating to such series of preferred stock as follows:
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TERMS OF PREFERRED STOCK

Section 1.     Definitions. Capitalized terms used herein and not otherwise defined herein shall have the respective meanings set forth in the Cooperation Agreement. For the purposes hereof, the following terms shall have the following meanings:

Affiliate” means any Person that, directly or indirectly through one or more intermediaries, controls or is controlled by or is under common control with a Person, as such terms are used in and construed under Rule 405 of the Securities Act.

Business Day” means any day except any Saturday, any Sunday, any day which is a federal legal holiday in the United States or any day on which banking institutions in the State of New York are authorized or required by law or other governmental action to close.

Commission” means the United States Securities and Exchange Commission.

Common Stock” means the Corporation’s common stock, par value $0.0001 per share, and stock of any other class of securities into which such securities may hereafter be reclassified or changed.

Common Stock Equivalents” means any securities of the Corporation or the Subsidiaries which would entitle the holder thereof to acquire at any time Common Stock, including, without limitation, any debt, preferred stock, rights, options, warrants or other instrument that is at any time convertible into or exercisable or exchangeable for, or otherwise entitles the holder thereof to receive, Common Stock.

Conversion Price” shall have the meaning set forth in Section 6(d).

Conversion Shares” means, collectively, the shares of Common Stock issuable upon conversion of the shares of Preferred Stock in accordance with the terms hereof.

Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder.

Holder” shall have the meaning given such term in Section 2.

Junior Securities” means the Common Stock and all other Common Stock Equivalents of the Corporation other than those securities which are explicitly senior or pari passu to the Series B Preferred Stock in dividend rights or liquidation preference.

Liquidation” shall have the meaning set forth in Section 5.

Original Issue Date” means the date of the first issuance of any shares of the Series B Preferred Stock regardless of the number of transfers of any particular shares of
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Series B Preferred Stock and regardless of the number of certificates which may be issued to evidence such Series B Preferred Stock.

Person” means an individual or corporation, partnership, trust, incorporated or unincorporated association, joint venture, limited liability company, joint stock company, government (or an agency or subdivision thereof) or other entity of any kind.
Cooperation Agreement” means the Cooperation Agreement, dated as of March 6, 2026, among the Corporation, Oelion AB, a company organized under the laws of Sweden (“Swedish SPV”), OMNIA Group Holdings AG, a company organized under the laws of Switzerland (“Omnia”), as amended, modified or supplemented from time to time in accordance with its terms.

Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

Series A Preferred Stock” shall mean the Series A Convertible Preferred Stock of the Corporation, par value $0.0001 per share.

Series B Preferred Stock” shall have the meaning set forth in Section 2.

Stated Value” shall have the meaning set forth in Section 2, as the same may be increased pursuant to Section 3.

Shareholder Approval” means such approval as may be required by the applicable rules and regulations of the Nasdaq Stock Market (or any successor entity) from the shareholders of the Corporation with respect to the transactions contemplated by the Transaction Documents, including the issuance of all of the Underlying Shares in excess of 19.99% of the issued and outstanding Common Stock on the date of the Cooperation Agreement.

Subscription Amount” shall mean, as to each Holder, the aggregate amount to be paid for the Series B Preferred Stock purchased pursuant to the Cooperation Agreement as specified below such Holder’s name on the signature page of the Cooperation Agreement and next to the heading “Subscription Amount,” in United States dollars and in immediately available funds.

Subsidiary” means any subsidiary of the Corporation as set forth on Schedule 3.1(a) of the Cooperation Agreement and shall, where applicable, also include any direct or indirect subsidiary of the Corporation formed or acquired after the date of the Cooperation Agreement.
Trading Day” means a day on which the principal Trading Market is open for business.

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Trading Market” means any of the following markets or exchanges on which the Common Stock is listed or quoted for trading on the date in question: the NYSE American, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market, the New York Stock Exchange, the Pink Open Market operated by OTC Markets Group, Inc. (“Pink Market”), the OTCQB Venture Market (“OTCQB”) or the OTCQX Best Market (“OTCQX”), or any successors to any of the foregoing.

Transaction Documents” means this Certificate of Designation, the Cooperation Agreement, all exhibits and schedules thereto and hereto and any other documents or agreements executed in connection with the transactions contemplated pursuant to the Cooperation Agreement.
Underlying Shares” means the shares of Common Stock issued and issuable upon conversion of the Series B Preferred Stock and issued and issuable in lieu of the cash payment of dividends on the Series B Preferred Stock in accordance with the terms of this Certificate of Designation.
Section 2.     Designation, Amount and Par Value; Ranking. The series of preferred stock shall be designated as the Corporation’s Series B Convertible Preferred Stock (the “Series B Preferred Stock”) and the number of shares so designated shall be 150,000 (which shall not be subject to increase without the written consent of the holders of a majority of the then outstanding shares of the Series B Preferred Stock (each, a “Holder” and collectively, the “Holders”)). Each share of Series B Preferred Stock shall have a par value of $0.0001 per share and a stated value equal to $1,000 (the “Stated Value”).

Section 3.     With respect to payment of dividends, distributions and payments upon the liquidation, dissolution and winding up of the Corporation, whether voluntary or involuntary, all Shares of the Series B Preferred Stock shall rank (i) senior to all Junior Securities; (ii) junior to the Series A Preferred Stock; (iii) on parity with any other class or series of preferred stock of the Corporation hereafter created specifically ranking, by its terms, on parity with the Series B Preferred Stock (the “Parity Securities”); and (iv) junior to any other class or series of preferred stock or other capital stock of the Corporation hereafter created specifically ranking, by its terms, senior to the Series B Preferred Stock (together with the Series A Preferred Stock, the “Senior Securities”).

Section 4.     Voting Rights. Except as otherwise provided herein or as otherwise required by law, the Series B Preferred Stock shall have no voting rights.
Section 5.    Liquidation. Upon any liquidation, dissolution or winding-up of the Corporation, whether voluntary or involuntary (a “Liquidation”), the Holders shall be entitled to receive out of the assets, whether capital or surplus, of the Corporation an amount equal to the Stated Value, plus any accrued and unpaid dividends thereon and any other fees or liquidated damages then due and owing thereon under this Certificate of Designation, for each share of Series B Preferred Stock before any distribution or payment shall be made to the holders of any Junior Securities, and if the assets of the Corporation shall be insufficient to pay in full such
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amounts, then the entire assets to be distributed to the Holders shall be ratably distributed among the Holders in accordance with the respective amounts that would be payable on such shares if all amounts payable thereon were paid in full.

Section 6.     Conversion.

a)Conversions at Option of Holder. Subject to the provisions of this Section 6, at any time and from time to time on or after the date of issuance, any holder of Series B Preferred Stock shall have the right by written election to the Corporation to convert all or any portion of the outstanding shares of Series B Preferred Stock held by such holder along with the aggregate accrued or accumulated and unpaid dividends thereon into an aggregate number of shares of Common Stock as is determined by (i) multiplying the number of shares of Series B Preferred Stock to be converted by the Stated Value thereof, and then (ii) dividing the result by the Conversion Price in effect immediately prior to such conversion.

b)Procedures for Automatic Conversion. In order to effectuate a conversion of shares of Series B Preferred Stock pursuant to Section 6.1(a), a holder shall (a) submit a written election to the Corporation that such holder elects to convert shares, the number of shares elected to be converted and (b) surrender, along with such written election, to the Corporation the certificate or certificates representing the Shares being converted, duly assigned or endorsed for transfer to the Corporation (or accompanied by duly executed stock powers relating thereto) or, in the event the certificate or certificates are lost, stolen, or missing, accompanied by an affidavit of loss executed by the holder. The conversion of such shares hereunder shall be deemed effective as of the date of surrender of such Series B Preferred Stock certificate or certificates or delivery of such affidavit of loss. Upon the receipt by the Corporation of a written election and the surrender of such certificate(s) and accompanying materials, the Corporation shall as promptly as practicable (but in any event within ten (10) days thereafter) deliver to the relevant holder (a) a certificate in such holder’s name (or the name of such holder's designee as stated in the written election) for the number of shares of Common Stock (including any fractional share) to which such holder shall be entitled upon conversion of the applicable shares as calculated pursuant to Section 6.1(a) and, if applicable (b) a certificate in such Holder’s (or the name of such Holder's designee as stated in the written election) for the number of Shares of Series B Preferred Stock (including any fractional share) represented by the certificate or certificates delivered to the Corporation for conversion but otherwise not elected to be converted pursuant to the written election. All shares of capital stock issued hereunder by the Corporation shall be duly and validly issued, fully paid, and nonassessable, free and clear of all taxes, liens, charges, and encumbrances with respect to the issuance thereof.

c)Effect of Conversion. All Shares of Series B Preferred Stock converted as provided in this Section 6 shall no longer be deemed outstanding as of the effective time of the applicable conversion and all rights with respect to such Shares shall immediately
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cease and terminate as of such time, other than the right of the holder to receive shares of Common Stock in exchange therefor.

d)Conversion Price. The conversion price for the Series B Preferred Stock shall equal $1.25, subject to adjustment herein (the “Conversion Price”).

e)Reservation of Shares Issuable Upon Conversion. The Corporation covenants that it will at all times reserve and keep available out of its authorized and unissued shares of Common Stock for the sole purpose of issuance upon conversion of the Series B Preferred Stock and payment of dividends on the Series B Preferred Stock, each as herein provided, free from preemptive rights or any other actual contingent purchase rights of Persons other than the Holder (and the other holders of the Series B Preferred Stock).

f)Fractional Shares. No fractional shares or scrip representing fractional shares shall be issued upon the conversion of the Series B Preferred Stock. As to any fraction of a share which the Holder would otherwise be entitled to purchase upon such conversion, the Corporation shall at its election, either pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the Conversion Price or round up to the next whole share. Notwithstanding anything to the contrary contained herein, but consistent with the provisions of this subsection with respect to fractional Conversion Shares, nothing shall prevent any Holder from converting fractional shares of Series B Preferred Stock.

g)Issuance Limitations. Notwithstanding anything herein to the contrary, if the Corporation has not obtained Shareholder Approval, then the Corporation may not issue, upon conversion of the Series B Preferred Stock, a number of shares of Common Stock which would exceed 19.99% of the number of shares of Common Stock outstanding on the date of the Cooperation Agreement (subject to adjustment for forward and reverse stock splits, recapitalizations and the like) (such number of shares, the “Issuable Maximum”). Each Holder shall be entitled to a portion of the Issuable Maximum equal to the quotient obtained by dividing (x) the original Stated Value of such Holder’s Series B Preferred Stock by (y) the aggregate Stated Value of all Series B Preferred Stock issued on the Original Issue Date to all Holders. In addition, each Holder may allocate its pro-rata portion of the Issuable Maximum among Series B Preferred Stock held by it in its sole discretion. Such portion shall be adjusted upward ratably in the event a Holder no longer holds any Series B Preferred Stock and the amount of shares issued to such Holder pursuant to such Holder’s Series B Preferred Stock was less than such Holder’s pro-rata share of the Issuable Maximum.

Section 7.     Certain Adjustments.

a)Stock Dividends and Stock Splits. If the Corporation, at any time while this Series B Preferred Stock is outstanding: (i) pays a stock dividend or otherwise makes a distribution or distributions payable in shares of Common Stock on shares of Common
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Stock (which, for avoidance of doubt, shall not include any shares of Common Stock issued by the Corporation upon conversion of, or payment of a dividend on, this Series B Preferred Stock), (ii) subdivides outstanding shares of Common Stock into a larger number of shares, (iii) combines (including by way of a reverse stock split) outstanding shares of Common Stock into a smaller number of shares, or (iv) issues, in the event of a reclassification of shares of the Common Stock, any shares of capital stock of the Corporation, then the Conversion Price shall be multiplied by a fraction of which the numerator shall be the number of shares of Common Stock (excluding any treasury shares of the Corporation) outstanding immediately before such event, and of which the denominator shall be the number of shares of Common Stock outstanding immediately after such event. Any adjustment made pursuant to this Section 7(a) shall become effective immediately after the record date for the determination of stockholders entitled to receive such dividend or distribution and shall become effective immediately after the effective date in the case of a subdivision, combination or re-classification.

b)Calculations. All calculations under this Section 7 shall be made to the nearest cent or the nearest 1/100th of a share, as the case may be. For purposes of this Section 7, the number of shares of Common Stock deemed to be issued and outstanding as of a given date shall be the sum of the number of shares of Common Stock (excluding any treasury shares of the Corporation) issued and outstanding.

c)Notice to the Holders. Whenever the Conversion Price is adjusted pursuant to any provision of this Section 7, the Corporation shall promptly deliver to each Holder by email a notice setting forth the Conversion Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment.
    Section 8.    Miscellaneous.

a)Notices. Any and all notices or other communications or deliveries to be provided by the Holders hereunder including, without limitation, any Notice of Conversion, shall be in writing and delivered personally, by e-mail attachment, or sent by a nationally recognized overnight courier service, addressed to the Corporation, at 2488 Historic Decatur Road, Suite 230, San Diego, California 92106, Attention: David Robson, e-mail address: drobson@nuvve.com, or such other e-mail address or address as the Corporation may specify for such purposes by notice to the Holders delivered in accordance with this Section 8. Any and all notices or other communications or deliveries to be provided by the Corporation hereunder shall be in writing and delivered personally, by e-mail attachment, or sent by a nationally recognized overnight courier service addressed to each Holder at the e-mail address or address of such Holder appearing on the books of the Corporation, or if no such e-mail address or address appears on the books of the Corporation, at the principal place of business of such Holder, as set forth in the Cooperation Agreement. Any notice or other communication or deliveries hereunder shall be deemed given and effective on the earliest of (i) the date of transmission, if such notice or communication is delivered via e-mail attachment at the e-mail address set forth in this Section prior to 5:30 p.m. (New York City time) on any
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date, (ii) the next Trading Day after the date of transmission, if such notice or communication is delivered via e-mail attachment at the e-mail address set forth in this Section on a day that is not a Trading Day or later than 5:30 p.m. (New York City time) on any Trading Day, (iii) the second Trading Day following the date of mailing, if sent by U.S. nationally recognized overnight courier service, or (iv) upon actual receipt by the party to whom such notice is required to be given.
b)Lost or Mutilated Preferred Stock Certificate. If a Holder’s Series B Preferred Stock certificate shall be mutilated, lost, stolen or destroyed, the Corporation shall execute and deliver, in exchange and substitution for and upon cancellation of a mutilated certificate, or in lieu of or in substitution for a lost, stolen or destroyed certificate, a new certificate for the shares of Preferred Stock so mutilated, lost, stolen or destroyed, but only upon receipt of evidence of such loss, theft or destruction of such certificate, and of the ownership hereof reasonably satisfactory to the Corporation.

c)Waiver. Any waiver by the Corporation or a Holder of a breach of any provision of this Certificate of Designation shall not operate as or be construed to be a waiver of any other breach of such provision or of any breach of any other provision of this Certificate of Designation or a waiver by any other Holders. The failure of the Corporation or a Holder to insist upon strict adherence to any term of this Certificate of Designation on one or more occasions shall not be considered a waiver or deprive that party (or any other Holder) of the right thereafter to insist upon strict adherence to that term or any other term of this Certificate of Designation on any other occasion. Any waiver by the Corporation or a Holder must be in writing.

d)Amendments. This Certificate of Designations or any provision thereof may be amended by obtaining the written consent of the majority of the Holders of the Series B Preferred Stock issued and outstanding on such date.

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    RESOLVED, FURTHER, that the Chairman, the president or any vice-president, and the secretary or any assistant secretary, of the Corporation be and they hereby are authorized and directed to prepare and file this Certificate of Designation of Preferences, Rights and Limitations in accordance with the foregoing resolution and the provisions of Delaware law.

IN WITNESS WHEREOF, the undersigned have executed this Certificate this 24th day of June, 2026.



/s/ Gregory Poilasne                     /s/ David Robson                
Name:    Gregory Poilasne                 Name:    David Robson
Title:    Chief Executive Officer             Title:     Secretary




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