Document:

Exhibit 4.1

AB ANNOVIS BIO,   INC. SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 03615A 10 8 INCORPORATED UNDER   THE LAWS OF THE STATE OF DELAWARE THIS CERTIFIES THAT IS THE RECORD HOLDER OF   FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, $0.0001 PAR VALUE PER   SHARE, OF ANNOVIS BIO, INC. transferable on the books of the Corporation in   person or by duly authorized attorney upon surrender of the Certificate   properly endorsed. This certificate is not valid until countersigned by the   Transfer Agent and registered by the Registrar. WITNESS the facsimile seal of   the Corporation and the facsimile signatures of its duly authorized officers.   Dated: SEAL 2008 PRESIDENT AND CHIEF EXECUTIVE OFFICER SECRETARY, TREASURER   AND CHIEF FINANCIAL OFFICER • COUNTERSIGNED AND REGISTERED: AMERICAN STOCK   TRANSFER & TRUST COMPANY, LLC (Brooklyn, NY) TRANSFER AGENT AND REGISTRAR   BY: AUTHORIZED SIGNATURE 

    

 

THE COMPANY   WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS A STATEMENT   OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE PARTICIPATING, OPTIONAL   OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF AND THE   QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR   RIGHTS. The following abbreviations, when used in the inscription on the face   of this certificate, shall be construed as though they were written out in   full according to applicable laws or regulations: TEN COM TEN ENT JT TEN – as   tenants in common – as tenants by the entireties – as joint tenants with   right of survivorship and not as tenants in common UNIF GIFT MIN ACT–   ......................Custodian ........................ (Cust) under Uniform   Gifts to Minors Act ............................ (State) (Minor) UNIF TRF MIN   ACT– ................Custodian (until age ..............) (Minor) to Minors   Act .......................................... (State) Additional   abbreviations may also be used though not in the above list. F or value   received, hereby sell, assign and transfer unto PLEASE INSERT SOCIAL SECURITY   OR OTHER IDENTIFYING NUMBER OF ASSIGNEE PLEASE PRINT OR TYPEWRITE NAME AND   ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE Shares of the common stock   represented by the within Certificate, and do hereby irrevocably constitute   and appoint Attorney to transfer the said stock on the books of the   within-named Corporation with full power of substitution in the premises.   Dated, X X NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE   NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR,   WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER. SIGNATURE(S)   GUARANTEED: THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR   INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT   UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM),   PURSUANT TO S.E.C. RULE 17Ad-15.EX-10.1

 Exhibit 10.1 

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS
BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED. 
 PROMISSORY NOTE 
  

			
	Principal Amount: Up to $300,000	  	Dated as of July 8, 2019

 New York, New York 

Stelco Acquisition Corp., a Delaware corporation and blank check company (the “Maker”), promises to pay to the order of
Stelco SPAC Holdings, Inc. or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of up to Three Hundred Thousand Dollars ($300,000) in lawful money of the United States of America, on the
terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written
notice in accordance with the provisions of this Note. 
 1.        
Principal. The principal balance of this Note shall be payable by the Maker on the earlier of: (i) March 31, 2020 or (ii) the date on which Maker consummates an initial public offering of its securities. The principal balance may be
prepaid at any time. Under no circumstances shall any individual, including but not limited to any offic er, director, employee or shareholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder. 

2.         Interest. No interest shall accrue on the unpaid principal
balance of this Note. 
 3.         Drawdown Requests. Maker and Payee
agree that Maker may request up to Three Hundred Thousand Dollars ($300,000) for costs reasonably related to Maker’s initial public offering of its securities. The principal of this Note may be drawn down from time to time prior to the earlier
of: (i) March 30, 2020 or (ii) the date on which Maker consummates an initial public offering of its securities, upon written request from Maker to Payee (each, a “Drawdown Request”). Each Drawdown Request must state the
amount to be drawn down, and must not be an amount less than Ten Thousand Dollars ($10,000) unless agreed upon by Maker and Payee. Payee shall fund each Drawdown Request no later than five (5) business days after receipt of a Drawdown Request;
provided, however, that the maximum amount of drawdowns collectively under this Note is Three Hundred Thousand Dollars ($300,000). Once an amount is drawn down under this Note, it shall not be available for future Drawdown Requests even if prepaid.
No fees, payments or other amounts shall be due to Payee in connection with, or as a result of, any Drawdown Request by Maker. Notwithstanding the foregoing, all payments shall be applied first to payment in full of any costs incurred in the
collection of any sum due under this Note, including (without limitation) reasonable attorneys’ fees, and then to the reduction of the unpaid principal balance of this Note. 

4.         Application of Payments. All payments shall be applied first to
payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid
principal balance of this Note. 
 5.         Events of Default. The
following shall constitute an event of default (“Event of Default”): 
 (a)        
Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5) business days of the date specified above. 

(b)         Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under any
applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official)
of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in
furtherance of any of the foregoing. 

 (c)         Involuntary Bankruptcy, Etc. The
entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee,
custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a
period of 60 consecutive days. 
 6.         Remedies. 

(a)         Upon the occurrence of an Event of Default specified in Section 5(a) hereof, Payee
may, by written notice to Maker, declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable without presentment, demand,
protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding. 

(b)         Upon the occurrence of an Event of Default specified in Sections 5(b) and 5(c), the unpaid
principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee. 

7.         Waivers. Maker and all endorsers and guarantors of, and sureties
for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all
benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing
for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be
sold upon any such writ in whole or in part in any order desired by Payee. 

8.         Unconditional Liability. Maker hereby waives all notices in
connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any
manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the
payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder. 

9.         Notices. All notices, statements or other documents which are
required or contemplated by this Note shall be made in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in
writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in writing by such party or (iii) by electronic mail, to the electronic mail address most recently
provided to such party or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the
business day following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 

10.         Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH THE LAWS OF DELAWARE, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF. 

11.         Severability. Any provision contained in this Note which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability
in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction. 

12.         Trust Waiver. Notwithstanding anything herein to the contrary,
the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account to be established in 

 
which the proceeds of the initial public offering (the “IPO”) to be conducted by the Maker (including the deferred underwriters discounts and commissions) and the proceeds of the
sale of the warrants to be issued in a private placement to occur prior to the closing of the IPO are to be deposited, as described in greater detail in the registration statement and prospectus to be filed with the Securities and Exchange
Commission in connection with the IPO, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the trust account for any reason whatsoever. 

13.         Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with,
and only with, the written consent of the Maker and the Payee. 
 14.         Assignment. No
assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the
required consent shall be void. 
 [Signature page follows] 

 IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note
to be duly executed by the undersigned as of the day and year first above written. 
  

			
	STELCO ACQUISITION CORP.
		
	By:	 	/s/ David Cheney
	Name:	 	David Cheney
	Title:	 	Chief Executive Officer

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