Exhibit 10.21

Certain information has been excluded as marked by [*] from this exhibit because it (i) is not material and (ii) would be competitively harmful if publicly disclosed.

EQUITY KICKER AND REGISTRATION RIGHTS AGREEMENT

This Equity Kicker and Registration Rights Agreement (this “Agreement”) dated as of December 26^th 2025, is made between EXYN TECHNOLOGIES, INC. (“Borrower”) and MAXIMCASH SOLUTIONS, LLC as lender (the “Lender” or “Holder”), pursuant to that certain Business Loan and Security Agreement entered into as of the date hereof between the parties hereto (the “Loan Agreement”). All capitalized terms not otherwise defined herein shall have the meanings set forth in the Loan Agreement.

RECITALS

Now, therefore, for consideration duly received it is hereby agreed as follows:

1.            Equity Kicker Issuance. Upon the consummation of the Company’s firmly underwritten initial public offering of equity securities (the “IPO”), the Company shall issue to Maximcash Solutions LLC, that number of shares of the Company’s (or the publicly traded successor entity’s) common stock having an aggregate value of One Hundred Twenty Thousand Dollars ($120,000), calculated based on the public offering price per share in the IPO (the “Equity Kicker Shares”). The Equity Kicker Shares shall be duly authorized, validly issued, fully paid and non-assessable, and shall be issued in the name of Maximcash Solutions LLC. The Equity Kicker Shares and related rights are independent of, and shall not be subordinated to, any equity or conversion rights of Neolync Holdings Ltd. or any other creditor or equity holder, and no third-party consent shall be required for their issuance, registration, resale, or enforcement.

2.            Registration Rights; IPO Registration Statement. The Company shall include the Equity Kicker Shares as selling shareholder shares in the registration statement filed with the U.S. Securities and Exchange Commission in connection with the IPO (the “Registration Statement”). Without limiting the foregoing, the Company shall:

The Company shall not enter into any underwriter lock-up or contractual restriction that would prohibit or materially impair Holder’s resale rights expressly set forth herein.

3.            Bleed-Out; Staged Resale. Notwithstanding the effectiveness of the Registration Statement, Holder’s resale of the Equity Kicker Shares shall be subject to the following staged resale provisions:

4.            IPO Failure Backstop. If the Company has not consummated an initial public offering on or before June 30, 2026, then, at Lender’s election, the Company shall either:

5.            Further Assurances. The Company shall execute and deliver such documents and take such actions as may be reasonably requested by Holder to effectuate the intent of this Agreement, including selling shareholder questionnaires, transfer agent instructions, and customary IPO documentation.

6.            Lender May Perform. If the Borrower fails to perform any agreement contained herein, the Lender may itself perform, or cause performance of, such agreement, and the expenses of the Agent and/or Lender incurred in connection therewith shall be payable by Borrower.

7.            Survival. The rights and obligations set forth in this Agreement shall survive repayment in full of the Loan and termination of the Loan Agreement.

8.            Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Utah without regard to conflict-of-laws principles.

Signature Page

The undersigned hereby, as a duly and appointed authorized agent of Borrower and each Secured Guarantor, and in each signer’s individual as a Guarantor, affirm that each has read and understand the terms and conditions of, consent to and agree to be bound by, the attached Agreement and the attached Authorization Agreement.

For Lenders Use Only: This Agreement has been received and accepted by Lender in Utah after being signed by Borrower and any Guarantor(s) (including any Secured Guarantor(s))