Exhibit
4.1


 


THIS
NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), OR UNDER ANY STATE SECURITIES
LAW AND THIS NOTE MAY NOT BE PLEDGED, SOLD, ASSIGNED OR TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT WITH
RESPECT THERETO UNDER THE ACT AND ANY APPLICABLE STATE SECURITIES LAW, OR UNLESS THE DEBTOR RECEIVES AN OPINION OF COUNSEL, SATISFACTORY
TO THE DEBTOR, THAT SUCH REGISTRATION IS NOT REQUIRED.


 


THIS
NOTE IS SUBJECT TO THE PROVISIONS OF A CERTAIN SUBORDINATION AGREEMENT DATED FEBRUARY 23, 2016, AS AMENDED, IN FAVOR OF GERBER
FINANCE, INC.


 


ATRM
HOLDINGS, INC.


 


PROMISSORY
NOTE


 


	    $500,000.00
    	March
    31, 2017    


 


FOR
VALUE RECEIVED, ATRM HOLDINGS, INC., a Minnesota corporation (the “Debtor”), promises to pay to the order of
LONE STAR VALUE CO-INVEST I, LP (the “Holder”), or its registered assigns, the principal amount of FIVE HUNDRED
THOUSAND DOLLARS ($500,000.00), in such coin or currency of the United States of America as at the time of payment shall be legal
tender for the payment of public or private debts, together with interest as set forth herein.


 


1.
Payment of Interest and Principal. All unpaid principal, together with any then accrued and unpaid interest and any other
amounts payable hereunder, shall be due and payable on April 1, 2019 (the “Maturity Date”). If any payment
hereunder becomes due and payable on a Saturday, Sunday or legal holiday under the laws of the United States of America or the
State of Minnesota, or both, the due date thereof shall be extended to the next business day and interest shall be payable for
any principal so extended for the period of such extension. Payments of principal and interest are to be made at the address provided
herein for the Holder (or at such other place as the Holder shall have notified the Debtor in writing at least five (5) days before
such payment is due) or by wire transfer pursuant to the Holder’s written instructions. Payments of interest and principal
are subordinate to any indebtedness evidenced by promissory notes held by Lone Star Value Investors, LP.


 


2.
Interest. (a) Interest shall accrue on the unpaid principal balance of this Note at the rate of ten percent (10.0%) per
annum, and shall be payable semiannually in cash on the third business day of each January and July (each, an “Interest
Payment Date”) in respect of the immediately preceding semi-annual period; provided, however, if an Event
of Default (as defined in Section 4 below) or an event with the passage of time or the giving of notice could become an Event
of Default, has not occurred, then the Holder may elect to receive any such interest payment by substituting for the abovementioned
interest rate a rate of twelve percent (12.0%) per annum for the applicable interest period (“PIK Interest”)
and elect to receive a payment entirely as PIK Interest or as 50% cash and 50% PIK Interest by delivery to the Debtor of written
notice of its election and a completed Allonge (in the form annexed hereto in Exhibit A) at least five (5) business days
prior to the applicable Interest Payment Date. Debtor shall deliver to the Holder an executed copy of such completed Allonge promptly
after its receipt thereof. PIK Interest shall bear interest from the applicable Interest Payment Date at the same rate and be
payable in the same manner as in the case of the original principal amount of this Note and shall otherwise be treated as principal
of this Note for all purposes. From and after each Interest Payment Date with respect to which the Debtor elects to pay PIK Interest,
the principal amount of this Note shall, without further action on the part of the Debtor or the Holder, be deemed to be increased
by the PIK Interest so capitalized and added to principal in accordance with the provisions hereof. Interest shall be calculated
from and include the date hereof and shall be calculated on an actual/360-day basis.


 




    	 



     


    




 


(b)
Notwithstanding anything to the contrary contained herein, in no event shall this or any other provision herein permit the collection
of any interest which would be usurious under applicable law. If under any circumstances, whether by reason of advancement or
acceleration of the maturity of the unpaid principal balance hereof or otherwise, the aggregate amounts paid under this Note shall
include amounts which by law are deemed interest and which would exceed the maximum rate permitted by law, the Debtor stipulates
that payment and collection of such excess amounts shall have been and will be deemed to have been the result of a mistake on
the part of both the Holder and the Debtor, and the Holder shall promptly credit such excess (only to the extent such payments
are in excess of the maximum rate) against the unpaid principal balance hereof and any portion of such excess payments not capable
of being so credited shall be refunded to the Debtor.


 


3.
Prepayment. The Debtor shall be entitled to prepay the principal amount of this Note (in whole or in part) together with
all interest under this Note accrued and unpaid at the date of prepayment at any time without penalty or premium upon five (5)
days prior written notice to the Holder. The Debtor shall be obligated to effect such prepayment within three (3) days after the
end of such notice period.


 


4.
Events of Default. (a) Acceleration. Upon the occurrence of any of the following events (herein called “Events
of Default”):


 


(i)
The Debtor shall fail to make full and timely payment of principal of or interest on this Note when due and such failure continues
for a period of five (5) consecutive days;


 


(ii)
(A) The Debtor or any of its material subsidiaries shall commence any proceeding or other action relating to it in bankruptcy
or seek reorganization, arrangement, readjustment of its debts, receivership, dissolution, liquidation, winding-up, composition
or any other relief under any bankruptcy law, or under any other insolvency, reorganization, liquidation, dissolution, arrangement,
composition, readjustment of debt or any other similar act or law, of any jurisdiction, domestic or foreign, now or hereafter
existing; (B) the Debtor or any of its material subsidiaries shall admit the material allegations of any petition or pleading
in connection with any such proceeding; (C) the Debtor or any of its material subsidiaries shall apply for, or consent or acquiesce
to, the appointment of a receiver, conservator, trustee or similar officer for it or for all or a substantial part of its property;
or (D) the Debtor or any of its material subsidiaries shall make a general assignment for the benefit of creditors;


 




    	 



     


    

 





(iii)
(A) The commencement of any proceedings or the taking of any other action against the Debtor or any of its material subsidiaries
in bankruptcy or seeking reorganization, arrangement, readjustment of its debts, liquidation, dissolution, arrangement, composition,
or any other relief under any bankruptcy law or any other similar act or law of any jurisdiction, domestic or foreign, now or
hereafter existing; (B) the appointment of a receiver, conservator, trustee or similar officer for the Debtor or any of its material
subsidiaries for any of its property; or


(C)
the issuance of a warrant of attachment, execution or similar process against any of the property of the Debtor or any of its
material subsidiaries, and the continuance of any such events for sixty (60) days undismissed, unbonded or undischarged;


 


(iv)
The Debtor breaches any of its representations and warranties made under that certain Securities Purchase Agreement, dated as
of the date hereof (the “Purchase Agreement”), by and between the Debtor and the Holder;


 


(v)
The Debtor shall fail to comply with any of its covenants or obligations under this Note (other than such failure described subsection
(i) above) or the Purchase Agreement, which failure shall continue uncured for thirty (30) calendar days after notice thereof
to the Debtor; or


 


(vi)
The Debtor shall, directly or indirectly, in one or more related transactions, (A) consolidate or merge with or into (whether
or not Debtor is the surviving corporation) another person, (B) sell, assign, transfer, convey or otherwise dispose of all or
substantially all of the properties or assets of Debtor to another person, (C) allow another person to make a purchase, tender
or exchange offer that is accepted by the holders of more than 50% of the outstanding shares of the Debtor’s common stock,
par value $0.001 per share (the “Common Stock”) (not including any shares of Common Stock held by the person
or persons making or party to, or associated or affiliated with the persons making or party to, such purchase, tender or exchange
offer), or (D) consummate a stock purchase agreement or other business combination (including, without limitation, a reorganization,
recapitalization or spin-off) with another person whereby such other person acquires more than 50% of the outstanding shares of
Common Stock (not including any shares of Common Stock held by the other person or other persons making or party to, or associated
or affiliated with the other persons making or party to, such stock purchase agreement or other business combination);


 


then,
and in any such event, the Holder, at the Holder’s option and without written notice to the Debtor, may declare the entire
principal amount of this Note then outstanding together with accrued unpaid interest thereon immediately due and payable, and
the same shall forthwith become immediately due and payable without presentment, demand, protest, or other notice of any kind,
all of which are expressly waived. The Events of Default listed herein are solely for the purpose of protecting the interests
of the Holder of this Note. If this Note is not paid in full upon acceleration, as required above, interest shall accrue on the
outstanding principal of and interest on this Note from the date of the Event of Default up to and including the date of payment
at a rate equal to the lesser of twelve percent (12.0%) per annum compounded on the third business day of each January and July
or the maximum interest rate permitted by applicable law.


 




    	 



     


    

 





(b)
Non-Waiver and Other Remedies. No course of dealing or delay on the part of the Holder of this Note in exercising any right
hereunder shall operate as a waiver or otherwise prejudice the right of the Holder of this Note. No remedy conferred in this Note
or the Purchase Agreement is intended to be exclusive of any other remedy, and each and every such remedy shall be cumulative
and shall be in addition to every other remedy conferred herein or now or hereafter existing at law or equity or by statute or
otherwise.


 


(c)
Collection Costs; Attorney’s Fees. In the case of an Event of Default, if this Note is turned over to an attorney
for collection, the Debtor agrees to pay all reasonable costs of collection, including reasonable attorney’s fees and expenses
and all out-of-pocket expenses incurred by the Holder in connection with such collection efforts.


 


5.
Additional Covenants. Until all principal and interest due hereunder has been repaid in full in cash, unless the Holder
shall otherwise consent, in its sole discretion, in advance in writing, the Debtor hereby covenants and agrees to:


 


(a)
furnish and provide to the Holder thirty (30) days prior written notice of any of the following actions between the Debtor or
Debtor’s affiliates and any third party lender: (i) renewal of any indebtedness; (ii) extension of the time of payment of
any indebtedness or any portion of such indebtedness; or (iii) loans or debt with or without a guarantee to the Debtor;


 


(b)
provide to the Holder, promptly after the Debtor obtains actual knowledge thereof, notice of all legal proceedings or orders against
either the Debtor or any of its affiliates that, if determined adversely to the Debtor or any of its affiliates, would reasonably
be expected to have a material adverse effect on the business, assets or properties of the Debtor, taken as a whole;


 


(c)
provide to the Holder promptly (and in any event within three (3) business days) after the occurrence of each event which is an
Event of Default (i) as defined herein or (ii) as defined by any agreement by Debtor, or Debtor’s affiliates to repay any
indebtedness of any kind that is senior in right of payment to the obligations of the Holder,


 


a
written notice of such event of default, setting forth the details of such event and the action (if any) that the Debtor proposes
to take with respect thereto;


 


(d)
not amend, or modify in any manner adverse to the Holder any provision of the Debtor’s articles of incorporation or bylaws;


 


(e)
not repay any indebtedness of any kind of the Debtor and Debtor’s affiliates that is subordinate in right of payment to
the obligations of the Holder or Holder’s affiliates;


 




    	 



     


    

 





(f)
not initiate or enforce any action against a third party, debt holder, or lender or defend against any action by a third party,
debt holder, or lender; other than in the normal course of business (including but not limited to collection and liens of client
accounts); and


 


(g)
use all power and control to assure Debtor’s affiliates do not initiate or enforce any action against a third party, debt
holder, or lender or defend against any action by a third party, debt holder, or lender; other than in the normal course of business
(including but not limited to collection and liens of client accounts).


 


6.
Cancellation. Upon full satisfaction of the Debtor’s obligations hereunder, the Holder shall promptly deliver or
cause to be delivered to the Debtor this Note for cancellation.


 


7.
Amendment; Waiver. This Note may not be amended or modified or the provisions hereof waived (either generally or in a particular
instance and either retroactively or prospectively) without the prior written consent of the party against whom such amendment,
modification, or waiver is sought to be enforced. All of the terms and provisions of this Note shall be applicable to and binding
upon each and every maker, Holder, endorser, surety, guarantor and all other persons who are or may become liable for the payment
hereof and their respective successors and assigns.


 


8.
Lost Documents. Upon receipt by the Debtor of evidence satisfactory to it of the loss, theft, destruction or mutilation
of this Note or any note exchanged for it, and (in the case of loss, theft or destruction) of indemnity reasonably satisfactory
to it, and upon surrender and cancellation of such note, if mutilated, the Debtor will make and deliver in lieu of such note a
new note of like tenor and unpaid principal amount and dated as of the original date of the original note.


 


9.
Miscellaneous.


 


(a)
Severability. In case any one or more of the provisions contained in this Note should be invalid, illegal or unenforceable
in any respect, the validity, legality and enforceability of the remaining provisions contained herein shall not in any way be
affected or impaired thereby.


 


(b)
Notices and Addresses. All notices, offers, acceptances and any other acts under this Note (except payment) shall be in
writing, and shall be sufficiently given if delivered to the addressee in person, by FedEx or similar receipted delivery, by facsimile
delivery with confirmed receipt or, if mailed, postage prepaid, by certified mail, return receipt requested, as follows:


 




    	 



     


    




 


	 	To
    Holder: 	Lone
    Star Value Co-Invest I, LP
	 	 	53
    Forest Avenue, 1st Floor
	 	 	Old
    Greenwich, Connecticut 06870
	 	 	Attn:
    Jeffry E. Eberwein, Manager and Hannah Bible, General Counsel
	 	 	Fax:
    (203) 990-0727
	 	 	 
	 	To
    the Debtor: 	ATRM
    Holdings, Inc.
	 	 	5215
    Gershwin Avenue N.
	 	 	Oakdale,
    Minnesota 55128
	 	 	Attn:
    Daniel M. Koch, President and Chief Executive Officer
	 	 	Fax:
    (651) 770-7975
	 	 	 
	 	 	With
    a copy to (which shall not constitute notice):
	 	 	 
	 	 	Olshan
    Frome Wolosky LLP
	 	 	1325
    Avenue of the Americas
	 	 	New
    York, New York 10019
	 	 	Attn:
    Adam Finerman, Esq.
	 	 	Fax:
    (212) 451-2222


 


or
to such other address as any of them, by notice to the others may designate from time to time.


 


(c)
Governing Law. This Note and any dispute, disagreement, or issue of construction or interpretation arising hereunder, whether
relating to its execution, its validity, the obligations provided therein or performance, shall be governed and interpreted according
to the law of the State of Minnesota, without regard to principals of conflicts of law.


 


(d)
Binding Effect; Assignment. This Note and the various rights and obligations arising hereunder shall inure to the benefit
of and be binding upon the parties hereto and their respective successors and permitted assigns. The Debtor may not delegate,
transfer or assign any rights or obligations hereunder without the Holder’s prior written consent. The Holder may not assign
or delegate all or any portion of the rights of the Holder hereunder without the consent of the Debtor (such consent not to be
unreasonably withheld, conditioned or delayed), except that no such consent shall be required for an assignment or delegation
to an affiliate of the Holder or while an Event of Default has occurred and is continuing. Any transfer or assignment of any of
the rights, interests or obligations hereunder in violation of the terms hereof shall be void and of no force or effect.


 


(e)
Jurisdiction and Venue. Each of the Holder and the Debtor (i) agree that any legal suit, action or proceeding arising out
of or relating to this Note shall be instituted exclusively in the courts of New York County in the State of New York, (ii) waive
any objection to the venue of any such suit, action or proceeding and the right to assert that such forum is not a convenient
forum, and (iii) irrevocably consent to the jurisdiction of the courts of New York County in the State of New York in any such
suit, action or proceeding, and further agree to accept and acknowledge service of any and all process which may be served in
any such suit, action or proceeding and agree that service of process upon them mailed by certified mail to their respective addresses
shall be deemed in every respect effective service of process upon them in any such suit, action or proceeding.


 




    	 



     


    

 





(f)
Section Headings. Section headings herein have been inserted for reference only and shall not be deemed to limit or otherwise
affect, in any manner, or be deemed to interpret in whole or in part any of the terms or provisions of this Note.


 


(g)
Waiver of Presentment. Debtor and each surety, endorser and guarantor hereof hereby waive all demands for payment, presentations
for payment, notices of intention to accelerate maturity, notices of acceleration of maturity, demand for payment, protest, notice
of protest and notice of dishonor, to the extent permitted by law, except for those notices expressly provided for herein. No
extension of time for payment of this Note or any installment hereof, no alteration, amendment or waiver of any provision of this
Note shall release, modify, amend, waive, extend, change, discharge, terminate or affect the liability of Debtor under this Note.


 


(h)
Forbearance. Any forbearance by the holder of this Note in exercising any right or remedy hereunder or under any other
agreement or instrument in connection with this Note or otherwise afforded by applicable law shall not be a waiver or preclude
the exercise of any right or remedy by the holder of this Note. The acceptance by the holder of this Note of payment of any sum
payable hereunder after the due date of such payment shall not be a waiver of the right of the holder of this Note to require
prompt payment when due of all other sums payable hereunder or to declare a default for failure to make prompt payment.


 


(i)
Acceleration. At the election of the holder of this Note, all payments due hereunder may be accelerated, and this Note
shall become immediately due and payable without notice or demand, upon the occurrence of an Event of Default under this Note,
which default is not cured within any grace period expressly provided therefor. In addition to the rights and remedies provided
herein, the holder of this Note may exercise any other right or remedy in any other document, instrument or agreement evidencing
or otherwise relating to the indebtedness evidenced hereby in accordance with the terms thereof, or under applicable law, all
of which rights and remedies shall be cumulative.


 


(j)
Construction. This Note shall be construed without any regard to any presumption or rule requiring construction against
the party causing such instrument or any portion thereof to be drafted.


 


[Signature
Page Follows]


 




    	 



     


    




 


[SIGNATURE
PAGE OF ATRM HOLDINGS, INC. PROMISSORY NOTE]


 


IN
WITNESS WHEREOF, the Debtor has caused this Note to be made and issued in its name on the date specified above.


 


	 	ATRM
    HOLDINGS, INC.
	 	 	 
	 	By:
    	/s/
    Daniel M. Koch
	 	Name:
    	Daniel
    M. Koch
	 	Title:
    	President
    and Chief Executive Officer


 




    	 



     


    

 


EXHIBIT
A – FORM OF ALLONGE


PROMISSORY
NOTE ISSUED March 31, 2017


 


This
Allonge No.____ to the Lone Star Value Co-Invest I, LP Note (“Allonge”) is made this ______ day of_____________ ,
by ATRM Holdings, Inc. a Minnesota corporation (“Debtor”) to Lone Star Value Co-Invest I, LP (“Holder”).
Reference is hereby made to that certain Promissory Note issued by Debtor to Holder dated March 31, 2017, (the “Note”).
Except as amended hereby, the terms of the Note remain as originally stated.


 


The
principal amount as stated on the face of the Note shall be increased by the PIK Interest in the amount of $___________ as of
[the semi-annual Interest Payment Date]. Interest on the increased portion of the principal amount shall accrue from [the semi-annual
interest due date]. The sum represents PIK Interest accrued on the outstanding principal amount of the Note at the annual rate
of 12% from___________ through_____ .


 


The
amendment to the principal amount due and owing on the Note described herein notwithstanding, Holder does not waive interest that
may have accrued at a default rate of interest and liquidated damages, if any, that may have accrued on the Note through the date
of this Allonge, which default interest and liquidated damages, if any, remain outstanding and payable.


 


IN
WITNESS WHEREOF, this Allonge is executed as of the date written above.


 


	 	ATRM
    HOLDINGS, INC.
	 	 	 
	 	By:	           
	 	Name:	 
	 	Title: