Contract

Exhibit 10.28

NEITHER THIS SECURITY NOR THE SECURITIES INTO WHICH THIS SECURITY IS CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS. THIS SECURITY AND THE SECURITIES ISSUABLE UPON CONVERSION OF THIS SECURITY MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY SUCH SECURITIES.

UNSECURED CONVERTIBLE PROMISSORY NOTE

Note Series:		2025

Date of Note:		June __, 2025

Principal Amount of Note:		[*]

For value received Firefly Automatix, Inc., a Delaware corporation (the “Company”), promises to pay to the undersigned holder or such party’s assigns (the “Holder”) the principal amount set forth above with interest on the outstanding principal amount at the rate of 15% per annum, compounded annually. Interest shall commence with the date hereof and shall continue on the outstanding principal amount until paid in full or converted. Interest shall be computed on the basis of a year of 365 days for the actual number of days elapsed. All unpaid interest and principal shall be due and payable upon request of the Majority Holders (as defined below) on or after June __, 2027 (the “Maturity Date”). The Maturity Date may be extended, before or after the Maturity Date, by the written consent of the Majority Holders (as defined below).

1. Basic Terms.

(a) Series of Notes. This unsecured convertible promissory note (the “Note”) is issued as part of a series of notes designated by the Note Series above (collectively, the “Notes”), and having an aggregate principal amount not to exceed $[*] and, issued in a series of multiple closings on or prior to June [*], 2025, to certain persons and entities (collectively, the “Holders”). The Company shall maintain a ledger of all Holders.

(b) Payments. All unpaid interest and principal shall be due and payable upon request of a majority of the outstanding principal amount of the Notes (the “Majority Holders”) on or after the Maturity Date. All payments of interest and principal shall be in lawful money of the United States of America and shall be made pro rata among all Holders. All payments shall be applied first to accrued interest, and thereafter to principal.

(c) Prepayment. The Company may prepay this Note at any time prior to the Maturity Date, without any prepayment penalty or premium.

2. Conversion.

(a) Mandatory Conversion. Notwithstanding anything herein to the contrary, if at any time prior to the Maturity Date the Company undertakes an underwritten public offering of common stock of the Company, par value $0.001 per share, and any other class of securities into which such securities may hereafter be reclassified or changed (the “Common Stock”), which raises at least $[*] million in gross proceeds (such event, a “Forced Conversion Event” and such offering a “Forced Conversion Offering”), all principal amount of this Note plus all accrued but unpaid interest, liquidated damages, and other amounts owing to the Holder under this Note shall convert or exchange into, concurrently with the consummation of the Forced Conversion Offering, shares of Common Stock at a conversion price equal to the lesser of (i) $5.5674 and (ii) 90% of the initial public offering price per share of the Common Stock sold in the Forced Conversion Offering (the “Forced Conversion Price”). In connection with and prior to any Forced Conversion Offering, the Holder will execute a lock-up agreement substantially in the form required by the underwriting agreement for such Forced Conversion Offering, having a lock-up period of 180 days from the date of such Forced Conversion Offering

(b) Maturity Date Repayment. In the event that this Note remains outstanding on the Maturity Date, then the outstanding principal balance of this Note and any unpaid accrued interest shall, upon the election of the Majority Holders given prior to the Maturity Date, convert as of the Maturity Date into shares of Common Stock at a conversion price equal to $5.5674 (the “Maturity Date Conversion Price” and together with the Forced Conversion Price the “Conversion Price”).

(c) Procedure for Conversion. In connection with any conversion of this Note into common stock, the Holder shall surrender this Note to the Company and deliver to the Company any documentation reasonably required by the Company (including any documentation required pursuant to Section 5(d) hereof in connection with a Forced Conversion Offering). The Company shall not be required to issue or deliver the Common Stock into which this Note may convert until the Holder has surrendered this Note to the Company and delivered to the Company any such documentation. Upon the conversion of this Note into Common Stock pursuant to the terms hereof, in lieu of any fractional shares to which the Holder would otherwise be entitled, the Company shall pay the Holder cash equal to such fraction multiplied by the price at which this Note converts.

(d) Interest Accrual. If a Forced Conversion Offering is consummated, all interest on this Note shall be deemed to have stopped accruing as of a date selected by the Company that is up to 10 days prior to the signing of the definitive agreement for the Forced Conversion Offering.

(e) Conversion Price Adjustment. If the Company, at any time while this Note is outstanding: (i) pays a stock dividend or otherwise makes a distribution or distributions payable in shares of Common Stock on shares of Common Stock (which, for the avoidance of doubt, shall not include any shares of Common Stock issued by the Company upon conversion of, or payment of interest on, the Note), (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 Company, 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 Company) 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 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.

3. Representations and Warranties.

(a) Representations and Warranties of the Company. The Company hereby represents and warrants to the Holder as of the date the first Note was issued as follows:

(i) Organization, Good Standing and Qualification. The Company is a corporation duly organized, validly existing and in good standing under the laws of the State of Delaware. The Company has the requisite corporate power to own and operate its properties and assets and to carry on its business as now conducted and as proposed to be conducted. The Company is duly qualified and is authorized to do business and is in good standing as a foreign corporation in all jurisdictions in which the nature of its activities and of its properties (both owned and leased) makes such qualification necessary, except for those jurisdictions in which failure to do so would not have a material adverse effect on the Company or its business (a “Material Adverse Effect”).

(ii) Power. The Company has all requisite corporate power to issue this Note and to carry out and perform its obligations under this Note.

(iii) Authorization. All corporate action on the part of the Company, the Company’s Board of Directors (the “Board”), and the Company’s stockholders necessary for the issuance and delivery of this Note has been taken. This Note constitutes a valid and binding obligation of the Company enforceable in accordance with its terms, subject to laws of general application relating to bankruptcy, insolvency, the relief of debtors and, with respect to rights to indemnity, subject to federal and state securities laws. Any securities issued upon conversion of this Note (the “Conversion Securities”), when issued in compliance with the provisions of this Note, will be validly issued, fully paid, nonassessable, free of any liens or encumbrances and issued in compliance with all applicable federal securities laws.

(iv) Compliance with Laws. To its knowledge, the Company is not in violation of any applicable statute, rule, regulation, order or restriction of any domestic or foreign government or any instrumentality or agency thereof in respect of the conduct of its business or the ownership of its properties, which violation of which would have a Material Adverse Effect.

(v) No “Bad Actor” Disqualification. The Company has exercised reasonable care to determine whether any Company Covered Person (as defined below) is subject to any of the “bad actor” disqualifications described in Rule 506(d)(1)(i) through (viii), as modified by Rules 506(d)(2) and (d)(3), under the Act (“Disqualification Events”). To the Company’s knowledge, no Company Covered Person is subject to a Disqualification Event. The Company has complied, to the extent required, with any disclosure obligations under Rule 506(e) under the Act. For purposes of this Note, “Company Covered Persons” are those persons specified in Rule 506(d)(1) under the Act; provided, however, that Company Covered Persons do not include (a) any Holder, or (b) any person or entity that is deemed to be an affiliated issuer of the Company solely as a result of the relationship between the Company and any Holder.

(vi) Offering. Assuming the accuracy of the representations and warranties of the Holder contained in subsection (b) below, the offer, issue, and sale of this Note and the Conversion Securities (collectively, the “Securities”) are and will be exempt from the registration and prospectus delivery requirements of the Act, and have been registered or qualified (or are exempt from registration and qualification) under the registration, permit or qualification requirements of all applicable state securities laws.

(vii) Use of Proceeds. The Company shall use the proceeds of this Note for general corporate and working capital purposes.

(b) Representations and Warranties of the Holder. The Holder hereby represents and warrants to the Company as of the date hereof as follows:

(i) Purchase for Own Account. The Holder is acquiring the Securities solely for the Holder’s own account and beneficial interest for investment and not for sale or with a view to distribution of the Securities or any part thereof, has no present intention of selling (in connection with a distribution or otherwise), granting any participation in, or otherwise distributing the same, and does not presently have reason to anticipate a change in such intention.

(ii) Information and Sophistication. Without lessening or obviating the representations and warranties of the Company set forth in subsection (a) above, the Holder hereby: (A) acknowledges that the Holder has received all the information the Holder has requested from the Company and the Holder considers necessary or appropriate for deciding whether to acquire the Securities, (B) represents that the Holder has had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the offering of the Securities and to obtain any additional information necessary to verify the accuracy of the information given the Holder and (C) further represents that the Holder has such knowledge and experience in financial and business matters that the Holder is capable of evaluating the merits and risk of this investment.

(iii) Ability to Bear Economic Risk. The Holder acknowledges that investment in the Securities involves a high degree of risk, and represents that the Holder is able, without materially impairing the Holder’s financial condition, to hold the Securities for an indefinite period of time and to suffer a complete loss of the Holder’s investment.

(iv) Further Limitations on Disposition. Without in any way limiting the representations set forth above, the Holder further agrees not to make any disposition of all or any portion of the Securities unless and until:

(1) There is then in effect a registration statement under the Act covering such proposed disposition and such disposition is made in accordance with such registration statement; or

(2) The Holder shall have notified the Company of the proposed disposition and furnished the Company with a detailed statement of the circumstances surrounding the proposed disposition, and if reasonably requested by the Company, the Holder shall have furnished the Company with an opinion of counsel, reasonably satisfactory to the Company, that such disposition will not require registration under the Act or any applicable state securities laws; provided that no such opinion shall be required for dispositions in compliance with Rule 144 under the Act, except in unusual circumstances.

(v) Accredited Investor Status. The Holder is an “accredited investor” as such term is defined in Rule 501 under the Act.

(vi) No “Bad Actor” Disqualification. The Holder represents and warrants that neither (A) the Holder nor (B) any entity that controls the Holder or is under the control of, or under common control with, the Holder, is subject to any Disqualification Event, except for Disqualification Events covered by Rule 506(d)(2)(ii) or (iii) or (d)(3) under the Act and disclosed in writing in reasonable detail to the Company. The Holder represents that the Holder has exercised reasonable care to determine the accuracy of the representation made by the Holder in this paragraph, and agrees to notify the Company if the Holder becomes aware of any fact that makes the representation given by the Holder hereunder inaccurate.

(vii) No Foreign Investor Status. The Holder is a United States person as defined by Section 7701(a)(30) of the Internal Revenue Code of 1986, as amended (the “Code”).

(viii) Forward-Looking Statements. With respect to any forecasts, projections of results and other forward-looking statements and information provided to the Holder, the Holder acknowledges that such statements were prepared based upon assumptions deemed reasonable by the Company at the time of preparation. There is no assurance that such statements will prove accurate, and the Company has no obligation to update such statements.

4. Events of Default.

(a) If there shall be any Event of Default (as defined below) hereunder, at the option and upon the declaration of the Majority Holders and upon written notice to the Company (which election and notice shall not be required in the case of an Event of Default under subsection (ii) or (iii) below), this Note shall accelerate and all principal and unpaid accrued interest shall become due and payable. The occurrence of any one or more of the following shall constitute an “Event of Default”:

(i) The Company fails to pay timely any of the principal amount due under this Note on the date the same becomes due and payable or any unpaid accrued interest or other amounts due under this Note on the date the same becomes due and payable;

(ii) The Company files any petition or action for relief under any bankruptcy, reorganization, insolvency or moratorium law or any other law for the relief of, or relating to, debtors, now or hereafter in effect, or makes any assignment for the benefit of creditors or takes any corporate action in furtherance of any of the foregoing; or

(iii) An involuntary petition is filed against the Company (unless such petition is dismissed or discharged within 60 days under any bankruptcy statute now or hereafter in effect, or a custodian, receiver, trustee or assignee for the benefit of creditors (or other similar official) is appointed to take possession, custody or control of any property of the Company).

5. Miscellaneous Provisions.

(a) Waivers. The Company hereby waives demand, notice, presentment, protest and notice of dishonor.

(b) Further Assurances. The Holder agrees and covenants that at any time and from time to time the Holder will promptly execute and deliver to the Company such further instruments and documents and take such further action as the Company may reasonably require in order to carry out the full intent and purpose of this Note and to comply with state or federal securities laws or other regulatory approvals.

(c) Transfers of Notes. This Note may be transferred only upon its surrender to the Company for registration of transfer, duly endorsed, or accompanied by a duly executed written instrument of transfer in form satisfactory to the Company. Thereupon, this Note shall be reissued to, and registered in the name of, the transferee, or a new Note for like principal amount and interest shall be issued to, and registered in the name of, the transferee. Interest and principal shall be paid solely to the registered holder of this Note. Such payment shall constitute full discharge of the Company’s obligation to pay such interest and principal.

(d) Market Standoff. To the extent requested by the Company or an underwriter of securities of the Company, the Holder and any permitted transferee thereof shall not, without the prior written consent of the managing underwriters in a Forced Conversion Offering (as hereafter defined), offer, sell, make any short sale of, grant or sell any option for the purchase of, lend, pledge, otherwise transfer or dispose of (directly or indirectly), enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership (whether any such transaction is described above or is to be settled by delivery of Securities or other securities, in cash, or otherwise), any Securities or other shares of stock of the Company then owned by the Holder or any transferee thereof, or enter into an agreement to do any of the foregoing, for up to 180 days following the effective date of the registration statement of such Forced Conversion Offering. The Company may place restrictive legends on the certificates representing the shares subject to this paragraph and may impose stop transfer instructions with respect to the Securities and such other shares of stock of the Holder and any transferee thereof (and the shares or securities of every other person subject to the foregoing restriction) until the end of such period. The Holder and any transferee thereof shall enter into any agreement reasonably required by the underwriters to the Forced Conversion Offering to implement the foregoing within any reasonable timeframe so requested. The underwriters for any Forced Conversion Offering are intended third party beneficiaries of this paragraph and shall have the right, power and authority to enforce the provisions of this paragraph as though they were parties hereto.

(e) Amendment and Waiver. Any term of this Note may be amended or waived with the written consent of the Company and the Holder. In addition, any term of this Note may be amended or waived with the written consent of the Company and the Majority Holders; provided, however, that (i) any such amendment or waiver must apply to all Notes, and (ii) the outstanding principal under this Note may not be amended, modified or waived without the written consent of the Holder. Upon the effectuation of such waiver or amendment with the consent of the Majority Holders in conformance with this paragraph, such amendment or waiver shall be effective as to, and binding against the holders of, all of the Notes and the Company shall promptly give written notice thereof to the Holder if the Holder has not previously consented to such amendment or waiver in writing; provided that the failure to give such notice shall not affect the validity of such amendment or waiver.

(f) Governing Law. This Note shall be governed by and construed under the laws of the State of Delaware, as applied to agreements among Delaware residents, made and to be performed entirely within the State of Delaware, without giving effect to conflicts of laws principles.

(g) Binding Agreement. The terms and conditions of this Note shall inure to the benefit of and be binding upon the respective successors and assigns of the parties. Nothing in this Note, expressed or implied, is intended to confer upon any third party any rights, remedies, obligations or liabilities under or by reason of this Note, except as expressly provided in this Note.

(h) Counterparts; ▇▇▇▇▇▇ of Delivery. This Note may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Counterparts may be delivered via facsimile, electronic mail (including pdf or any electronic signature complying with the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act or other applicable law) or other transmission method and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

(i) Titles and Subtitles. The titles and subtitles used in this Note are used for convenience only and are not to be considered in construing or interpreting this Note.

(j) Notices. All notices required or permitted hereunder shall be in writing and shall be deemed effectively given: (i) upon personal delivery to the party to be notified, (ii) when sent by confirmed electronic mail or facsimile if sent during normal business hours of the recipient, if not, then on the next business day, (iii) five days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or (iv) one business day after deposit with a nationally recognized overnight courier, specifying next day delivery, with written verification of receipt. All communications to a party shall be sent to the party’s address set forth on the signature page hereto or at such other address(es) as such party may designate by 10 days’ advance written notice to the other party hereto.

(k) Expenses. The Company and the Holder shall each bear its respective expenses and legal fees incurred with respect to the negotiation, execution and delivery of this Note and the transactions contemplated herein.

(l) Delays or Omissions. It is agreed that no delay or omission to exercise any right, power or remedy accruing to the Holder, upon any breach or default of the Company under this Note shall impair any such right, power or remedy, nor shall it be construed to be a waiver of any such breach or default, or any acquiescence therein, or of or in any similar breach or default thereafter occurring; nor shall any waiver of any single breach or default be deemed a waiver of any other breach or default theretofore or thereafter occurring. It is further agreed that any waiver, permit, consent or approval of any kind or character by the Holder of any breach or default under this Note, or any waiver by the Holder of any provisions or conditions of this Note, must be in writing and shall be effective only to the extent specifically set forth in writing and that all remedies, either under this Note, or by law or otherwise afforded to the Holder, shall be cumulative and not alternative. This Note shall be void and of no force or effect in the event that the Holder fails to remit the full principal amount to the Company within five calendar days of the date of this Note.

(m) Entire Agreement. This Note constitutes the full and entire understanding and agreement between the parties with regard to the subjects hereof, and no party shall be liable or bound to any other party in any manner by any representations, warranties, covenants and agreements except as specifically set forth herein.

(n) Exculpation among Holders. The Holder acknowledges that the Holder is not relying on any person, firm or corporation, other than the Company and its officers and Board members, in making its investment or decision to invest in the Company.

(o) Broker’s Fees. Each party hereto represents and warrants that no agent, broker, investment banker, person or firm acting on behalf of or under the authority of such party hereto is or will be entitled to any broker’s or finder’s fee or any other commission directly or indirectly in connection with the transactions contemplated herein. Each party hereto further agrees to indemnify each other party for any claims, losses or expenses incurred by such other party as a result of the representation in this subsection being untrue.

[Signature pages follow]

The parties have executed this Unsecured Convertible Promissory Note as of the date first noted above.

	COMPANY:

	Firefly Automatix, Inc.

	By:
	Name:
	Title:

	Email:

	Address:	▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇
		Salt Lake City, UT 84101

SIGNATURE PAGE TO

FIREFLY AUTOMATIX, INC.

UNSECURED CONVERTIBLE PROMISSORY NOTE