Global Guaranty Agreement between Bakkt Opco Holdings, LLC and YA II PN, LTD. (June 17, 2025)

Exhibit 10.3

Certain personally identifiable information has been omitted from this exhibit pursuant to

item 601(a)(6) of Regulation S-K. [***] indicates that information has been redacted.

GLOBAL GUARANTY AGREEMENT

This Guaranty (as amended, amended and restated, supplemented or otherwise modified from time to time, this “Guaranty”) is made as of June 17, 2025, by Bakkt Opco Holdings, LLC, a Delaware limited liability company (the “Guarantor”) in favor of YA II PN, LTD. (“YA II” or the “Creditor”), with respect to all obligations of BAKKT HOLDINGS, INC., a company incorporated under the laws of the State of Delaware (the “Debtor”) owed to the Creditor.

RECITALS

WHEREAS, the Creditor and the Debtor have entered into a Securities Purchase Agreement (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Agreement”) on June 17, 2025 pursuant to which the Creditor shall purchase a convertible debenture (the “Convertible Debenture”) to be issued by the Debtor to the Creditor, pursuant to and upon the terms and conditions of the Agreement, in the amount of $25 million;

WHEREAS, in connection with the Creditor’s obligation to purchase the Convertible Debenture from the Debtor, the Guarantor has agreed to guarantee all of the Debtor’s obligations under the Agreement and the Convertible Debenture (together, the “Transaction Documents”). The Creditor is only willing to enter into the Agreement and purchase the Convertible Debenture from the Debtor if the Guarantor agrees to execute and deliver to the Creditor this Guaranty; and

WHEREAS, the Guarantor is, or will be at the time of issuance of the Convertible Debenture, wholly owned, or a majority owned subsidiary of the Debtor and will benefit, directly or indirectly, from the Debtor entering into the Transaction Documents and extensions of credit the Creditor will make to Debtor;

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Guarantor covenants and agrees as follows:

1. Guaranty of Payment and Performance. The Guarantor hereby guarantees to the Creditor the full, prompt and unconditional payment when due (whether at maturity, by acceleration or otherwise), and the performance, of all liabilities, agreements and other obligations of the Debtor to the Creditor contained in the Transaction Documents (all the foregoing, collectively, the “Obligations”). This Guaranty is an absolute, unconditional and continuing guaranty of the full and punctual payment and performance of the Obligations and not of their collectability only and is in no way conditioned upon any requirement that the Creditor first attempt to collect or require the performance of any of the Obligations from the Debtor or resort to any security or other means of obtaining their payment. Should the Debtor default in the payment or performance of any of the Obligations, the obligations of the Guarantor hereunder shall become immediately due and payable to the Creditor, without demand or notice of any nature, all of which are expressly waived by the Guarantor.

2. Limited Guaranty. The liability of the Guarantor hereunder shall be limited to the amount of the Obligations due to the Creditor.

3. Waivers by Guarantor; Creditor’s Freedom to Act. The Guarantor hereby agrees that the Obligations will be paid and performed strictly in accordance with their terms regardless of any law, regulation or order now or hereafter in effect in any jurisdiction affecting any of such terms or the rights of the Creditor with respect thereto. The Guarantor waives presentment, demand, protest, notice of acceptance, notice of Obligations incurred and all other notices of any kind, all defenses that may be available by virtue of any valuation, stay, moratorium law or other similar law now or hereafter in effect (other than payment in full of the Obligations), any right to require the marshalling of assets of the Debtor, and all suretyship defenses generally. Without limiting the generality of the foregoing, the Guarantor agrees to the provisions of any instrument evidencing, securing or otherwise executed in connection with any Obligation and agrees that the obligations of such Guarantor hereunder shall not be released or discharged, in whole or in part, or otherwise affected by (i) the failure of the Creditor to assert any claim or demand or to enforce any right or remedy against the Debtor; (ii) any extensions or renewals of, or alteration of the terms of, any Obligation or any portion thereof unless entered into by the Creditor; (iii) any rescissions, waivers, amendments or modifications of any of the terms or provisions of any agreement evidencing, securing or otherwise executed in connection with any Obligation unless entered into by the Creditor; (iv) the substitution or release of any entity primarily or secondarily liable for any Obligation; (v) the adequacy of any rights the Creditor may have against any collateral or other means of obtaining payment or performance of the Obligations; (vi) the impairment of any collateral securing the Obligations, including without limitation the failure to perfect or preserve any rights the Creditor might have in such collateral or the substitution, exchange, surrender, release, loss or destruction of any such collateral; (vii) failure to obtain or maintain a right of contribution for the benefit of such Guarantor; (viii) errors or omissions in connection with the Creditor’s administration of the Obligations (except behavior constituting bad faith); or (ix) any other act or omission that might in any manner or to any extent vary the risk of any Guarantor or otherwise operate as a release or discharge of any Guarantor, all of which may be done without notice to any Guarantor.

4. Unenforceability of Obligations Against Debtor. If for any reason the Debtor is under no legal obligation to discharge or perform any of the Obligations, or if any of the Obligations have become irrecoverable from the Debtor by operation of law or for any other reason, this Guaranty shall nevertheless be binding on the Guarantor to the same extent as if the Guarantor at all times had been the principal obligor on all such Obligations. In the event that acceleration of the time for payment of the Obligations is stayed upon the insolvency, bankruptcy or reorganization of the Debtor, or for any other reason, all such amounts otherwise subject to acceleration under the terms of any agreement evidencing, securing or otherwise executed in connection with any Obligation shall be immediately due and payable by the Guarantor.

5. Subrogation; Subordination. Until the payment and performance in full of all Obligations, the Guarantor shall not exercise any rights against the Debtor arising as a result of payment by the Guarantor hereunder, by way of subrogation or otherwise, and will not prove any claim in competition with the Creditor in respect of any payment hereunder in bankruptcy or insolvency proceedings of any nature; the Guarantor will not claim any set-off or counterclaim against the Debtor in respect of any liability of the Guarantor to the Debtor; and the Guarantor waives any benefit of and any right to participate in any collateral that may be held by the Creditor. The payment of any amounts due with respect to any indebtedness of the Debtor now

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or hereafter held by the Guarantor is hereby subordinated to the prior payment in full of the Obligations. The Guarantor agrees that after the occurrence of any default in the payment or performance of the Obligations, the Guarantor will not demand, sue for or otherwise attempt to collect any such indebtedness of the Debtor to the Guarantor until the Obligations shall have been paid or performed in full. If, notwithstanding the foregoing sentence, the Guarantor shall collect, enforce or receive any amounts in respect of such indebtedness, such amounts shall be collected, enforced and received by the Guarantor as trustee for the Creditor and be paid over to the Creditor on account of the Obligations without affecting in any manner the liability of the Guarantor under the other provisions of this Guaranty.

7. Termination; Reinstatement. This Guaranty is irrevocable and shall continue until such time as the Obligations have been indefeasibly paid or performed in full. This Guaranty shall be reinstated if at any time any payment made or value received with respect to an Obligation is rescinded or must otherwise be returned by the Creditor upon the insolvency, bankruptcy or reorganization of the Debtor, or otherwise, all as though such payment had not been made or value received.

8. Successors and Assigns. This Guaranty shall be binding upon the Guarantor, its successors and assigns, and shall inure to the benefit of and be enforceable by the Creditor and the Creditor’s shareholders, officers, directors, agents, successors and assigns.

9. Amendments and Waivers. No amendment or waiver of any provision of this Guaranty nor consent to any departure by the Guarantor therefrom shall be effective unless the same shall be in writing and signed by the Creditor. No failure on the part of the Creditor to exercise, and no delay in exercising, any right hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any right hereunder preclude any other or further exercise thereof or the exercise of any other right.

10. Notices. All notices and other communications called for hereunder to the Creditor or the Debtor shall be made in writing as provided in the Agreement. All notices and other communications called for hereunder to the Guarantor shall be made in writing as provided on Schedule I attached hereto or as the Guarantor may otherwise notify the Creditor.

11. Governing Law; Consent to Jurisdiction Waiver of Jury Trial. This Guaranty is intended to take effect as a sealed instrument and shall be governed by, and construed in accordance with, the laws of the State of New York (excluding the laws applicable to conflicts or choice of law). The Guarantor agrees that any suit for the enforcement of this Guaranty may be brought in the courts of the State of New York, New York County and consents to the non-exclusive jurisdiction of such court and to service of process in any such suit’s being made upon any Guarantor by mail at the address set forth at the head of this Guaranty. The Guarantor hereby waives any objection that it may now or hereafter have to the venue of any such suit or any such court or that such suit was brought in an inconvenient court. EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS GUARANTY OR THE TRANSACTIONS CONTEMPLATED HEREIN, THE PERFORMANCE THEREOF OR THE FINANCINGS CONTEMPLATED HEREBY (WHETHER BASED ON

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CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTY HERETO HAVE BEEN INDUCED TO ENTER INTO THIS GUARANTY BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS PARAGRAPH.

12. Counterparts; Effectiveness. This Guaranty may be executed in identical counterparts, both which shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party. Facsimile or other electronically scanned and delivered signatures (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com), including by e-mail attachment, shall be deemed to have been duly and validly delivered and be valid and effective for all purposes of this Guaranty.

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IN WITNESS WHEREOF, the Guarantor has caused this Guaranty to be executed and delivered as a sealed instrument as of the date appearing on page one.

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Schedule I

The Guarantor

Bakkt Opco Holdings, LLC

10000 Avalon Boulevard, Suite 1000

Alpharetta, GA 30009

Attention: Marc D’Annunzio

Email: [***]

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