Document:

Exhibit 4.1

 

SINOVAC BIOTECH
LTD.

 

and

 

PACIFIC STOCK
TRANSFER COMPANY

 

as Rights Agent

 

SECOND AMENDMENT

 

TO

 

AMENDED AND RESTATED
RIGHTS AGREEMENT

 

Effective as of February 21,
2021

 

This Second Amendment (this “Amendment”)
to the Amended and Restated Rights Agreement (as defined below), is between Sinovac Biotech Ltd., an Antigua and Barbuda company
(the “Company”), and Pacific Stock Transfer Company (the “Rights Agent”).

 

WHEREAS, the Company and the Rights
Agent have heretofore executed and entered into the Amended and Restated Rights Agreement dated as of February 22, 2019 (the
 “Amended and Restated Rights Agreement”), as amended by the Amendment to the Amended and Restated Rights
Agreement, dated as of February 19, 2020, between the Company and the Rights Agent;

 

WHEREAS, the Amended and Restated Rights
Agreement, under its current terms, will expire on the close of business on February 22, 2021;

 

WHEREAS, pursuant to Section 26 of the Amended
and Restated Rights Agreement, the Company and the Rights Agent may from time to time supplement or amend any provision of the
Amended and Restated Rights Agreement in accordance with the provisions of Section 26 thereof;

 

WHEREAS, the Board of Directors of the
Company has determined that it is in the best interests of the Company and the holders of the Rights to amend the Amended and
Restated Rights Agreement as provided herein; and

 

WHEREAS, all acts and things necessary to
make this Amendment a valid agreement according to its terms have been done and performed, and the execution and delivery of this
Amendment by the Company and the Rights Agent have been in all respects authorized by the Company and the Rights Agent.

 

    	 	1	 

     

    

 

NOW, THEREFORE, in consideration of the
foregoing and mutual agreements set forth herein, the Company and the Rights Agent agree as follows:

 

		1.	Amendments.

 

		1.1	Section 7.1 of the Amended and Restated Rights Agreement is amended to replace the reference to “February 22, 2021”
with “February 22, 2022”.

 

		1.2	All references to the date of “February 22, 2021” in Exhibit B (the Form of Right Certificate) and Exhibit C (the
Summary of Rights to Purchase Preferred Shares) to the Amended and Restated Rights Agreement shall hereby be changed to “February
22, 2022”.

 

		2.	Capitalized Terms. Capitalized terms used herein but not defined shall have the meanings given to them in the Amended
and Restated Rights Agreement.

 

		3.	Effect of Amendment. Except as expressly amended hereby, the Amended and Restated Rights Agreement shall remain in full
force and effect in accordance with its terms.

 

		4.	Benefits of Amendment. Nothing in this Amendment shall be construed to give to any Person or corporation other than
the Company, the Rights Agent and the registered holders of the Right Certificates (and, prior to the Distribution Date, the Common
Shares) any legal or equitable right, remedy or claim under this Amendment; but this Amendment shall be for the sole and exclusive
benefit of the Company, the Rights Agent and the registered holders of the Right Certificates (and, prior to the Distribution Date,
the Common Shares).

 

		5.	Severability. If any term, provision, covenant or restriction of this Amendment is held by a court of competent jurisdiction
or other authority to be invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of
this Amendment shall remain in full force and effect and shall in no way be affected, impaired or invalidated. The parties hereto
further agree to replace such invalid, void or unenforceable provision of this Amendment with a valid, legal and enforceable provision
that carries out the parties’ intentions to the greatest lawful extent under this Amendment.

 

		6.	Governing Law. This Amendment shall be deemed to be a contract made under the internal laws of the State of Delaware
and for all purposes shall be governed by and construed in accordance with the laws of such State applicable to contracts to be
made and performed entirely within such State.

 

		7.	Counterparts. This Amendment may be executed in any number of counterparts and each of such counterparts shall for all
purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. A signature
to this Amendment transmitted electronically shall have the same authority, effect, and enforceability as an original signature.

 

		8.	Descriptive Headings. Descriptive headings of the several Sections of this Amendment are inserted for convenience only
and shall not control or affect the meaning or construction of any of the provisions hereof.

 

[Signature page follows.]

 

    	 	2	 

     

    

 

IN WITNESS WHEREOF, the parties hereto have
caused this Amendment to the Amended and Restated Rights Agreement to be duly executed, as of the day and year first above written.

 

	 	SINOVAC BIOTECH LTD.
	 	 	 
	 	By:	/s/ Yin Weidong
	 	 	Name: YIN WEIDONG
	 	 	Title: Chairman, President & CEO
	 	 
	 	PACIFIC STOCK TRANSFER COMPANY,
	 	as Rights Agent
	 	 	 
	 	By:	/s/ Joslyn G. Claiborne
	 	 	Name: JOSLYN G. CLAIBORNE
	 	 	Title: Managing Director

 

[Signature Page to the Second Amendment
to Amended and Restated Rights Agreement]EX-4.1

 Exhibit 4.1 
  

			
	NUMBER	  	UNITS
	U-	  	

 SEE REVERSE FOR CERTAIN DEFINITIONS 

CUSIP 42087R 207 

HAYMAKER ACQUISITION CORP. III 

UNITS CONSISTING OF ONE SHARE OF CLASS A COMMON STOCK AND ONE-QUARTER OF ONE WARRANT, 

EACH WHOLE WARRANT ENTITLING THE HOLDER TO PURCHASE ONE SHARE OF CLASS A COMMON STOCK 

THIS CERTIFIES THAT                  is the owner of
                 Units. 
 Each Unit
(“Unit”) consists of one (1) share of Class A common stock, par value $0.0001 per share (“Common Stock”), of Haymaker Acquisition Corp. III, a Delaware corporation (the
“Company”), and one quarter of one redeemable warrant (the “Warrant”). Each whole Warrant entitles the holder to purchase one (1) share (subject to adjustment) of Common Stock for $11.50 per
share (subject to adjustment). Each Warrant will become exercisable on the later of (i) thirty (30) days after the Company’s completion of a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or
other similar business combination with one or more businesses (each a “Business Combination”), or (ii) twelve (12) months from the closing of the Company’s initial public offering, and will expire unless
exercised before 5:00 p.m., New York City Time, on the date that is five (5) years after the date on which the Company completes its initial Business Combination, or earlier upon redemption or liquidation (the “Expiration
Date”). The Common Stock and Warrants comprising the Units represented by this certificate are not transferable separately prior to                 ,
2021, unless Citigroup Global Markets Inc. and Cantor Fitzgerald & Co. elect to allow separate trading earlier, subject to the Company’s filing of a Current Report on Form 8-K with the
Securities and Exchange Commission containing an audited balance sheet reflecting the Company’s receipt of the gross proceeds of the Company’s initial public offering and issuing a press release announcing when separate trading will
begin. The terms of the Warrants are governed by a Warrant Agreement, dated as of                 , 2021, between the Company and Continental Stock
Transfer & Trust Company, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant
Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York 10004, and are available to any Warrant holder on written request and without cost.

 This certificate is not valid unless countersigned by the Transfer Agent and Registrar of the Company. 

This certificate shall be governed by and construed in accordance with the internal laws of the State of New York. 

Witness the facsimile signature of a duly authorized signatory of the Company. 

 

					
	  
 Authorized Signatory
	 	        	  	  
 Transfer Agent

 Haymaker Acquisition Corp. III 

The Company will furnish without charge to each unitholder 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 of the Company 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    —    as tenants in common	  	UNIF GIFT MIN ACT —	  	                	  	 	                Custodian                	 
	TEN ENT      —    as tenants by the entireties	  		  	    (Cust)    	  	 	            (Minor)  	 
			
	JT TEN          —     as joint tenants with right of survivorship and not as tenants in common	  		  	under Uniform Gifts to Minors Act

                       
                                     
	 
  

		  		  	(State)	 

 Additional abbreviations may also be used though not in the above list. 

For 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 ZIP CODE, OF ASSIGNEE) 

Units represented by the within Certificate, and do hereby irrevocably constitute and appoint 

Attorney to transfer the said Units on the books of the within named Company with full power of substitution in the premises. 

Dated 
  

	
	  
  

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 (OR ANY SUCCESSOR RULE). 

In each case, as more fully described in the Company’s final prospectus dated
                , 2021, the holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds
held in the trust account established in connection with its initial public offering only in the event that (i) the Company redeems the shares of Class A common stock sold in the Company’s initial public offering and liquidates
because it does not consummate an initial business combination within the time period set forth in the Company’s amended and restated certificate of incorporation, as the same may be amended from time to time (such date being referred to herein
as the “Last Date”), (ii) the Company redeems the shares of Class A common stock sold in its initial public offering in connection with a stockholder vote to amend the Company’s amended and restated certificate of
incorporation to modify the substance or timing of the Company’s obligation to redeem 100% of the Class A common stock if it does not consummate an initial business combination by the Last Date, or (iii) if the
holder(s) seek(s) to redeem for cash his, her or its respective shares of Class A common stock in connection with a tender offer (or proxy solicitation, solely in the event the Company seeks stockholder approval of the proposed
initial business combination) setting forth the details of a proposed initial business combination. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account.

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