Document:

QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.1    
    

	 
	 	 
	 	 

	NO.            

CUSIP NO.            	 	MDC ACQUISITION PARTNERS INC.
 Incorporated under the Laws of the State of Delaware	 	UNIT(S)            

UNIT(S)
CONSISTING OF ONE SHARE OF COMMON STOCK AND ONE WARRANT TO PURCHASE ONE SHARE OF COMMON STOCK 

SEE REVERSE FOR CERTAIN DEFINITIONS

THIS CERTIFIES THAT
                                         IS
THE OWNER OF
                                        
UNIT(S).
Each unit ("Unit") consists of one (1) share of common stock, par value $0.0001 per share ("Common Stock"), of MDC Acquisition Partners Inc., a Delaware corporation (the "Corporation"),
and one (1) warrant (the "Warrant"). The Warrant entitles the holder to purchase one (1) share of Common Stock for $6.00 per share (subject to adjustment). The Common Stock and Warrant
comprising the Units represented by this certificate are not transferable separately until 20 days after the earlier to occur of the expiration of the underwriters' option to purchase up to
1,500,000 additional units to cover over-allotments or the exercise in full or in part by the underwriters of such option. The terms of the Warrant are governed by a Warrant Agreement,
dated as of
                                         
         , 2005 (the "Warrant Agreement"), between the Corporation 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 17 Battery Place, 8th Floor, New York, NY 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 registered by the registrar of the Corporation.

WITNESS the seal of the Corporation and the facsimile signature of its duly authorized officers.

	 
	 	 
	 	 

	Dated:                                      
  , 2005	 	 	 	 
	

 Secretary	
 	
MDC Acquisition Partners Inc.

CORPORATE SEAL

2005

DELAWARE	
 	

Chief Executive Officer
	
 Transfer Agent	 	 	 	 

        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	tenants by the entireties	 	(Cust)	 	(Minor)
	JT TEN	as joint tenants with right of survivorship	 	Under Uniform Gifts to Minors
	 	and not as tenants in common	 	    Act:                              
	 	 	 	 	(State)	 

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

MDC Acquisition Partners Inc.  

        The
Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, option or other special rights of each
class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the Units represented hereby are issued
and shall be held subject to the terms and conditions applicable to the securities underlying and comprising the Units. 

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 Corporation with full power of substitution in the premises.

	 
	 	 
	 	 

	Dated                             	 	 	 	By:
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:	
 	

 	
 	

 
	

By:
THE SIGNATURE(S) SHOULD 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).	
 	

 	
 	

 

QuickLinks

Exhibit 4.1QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.2    
    

	NO.	 	 	 	 	 	MDC ACQUISITION PARTNERS INC.	 	 	 	SHARES
	 	 	
	 	 	 	
	 	 
	CUSIP NO.:	 	 	 	Incorporated under the Laws of the State of Delaware	 	 	 	 
	 	 	 	 	
	 	 	 	 	 	 

COMMON STOCK
 Par Value $0.0001 per Share 

SEE REVERSE FOR CERTAIN DEFINITIONS  

THIS CERTIFIES THAT                          IS THE OWNER OF
                         FULLY PAID AND
NON-ASSESSABLE SHARES OF COMMON STOCK, WITH A PAR VALUE $0.0001 PER SHARE, OF MDC ACQUISITION PARTNERS INC., a Delaware corporation (the "Corporation"), transferable on the books of
the Corporation in person or by duly authorized attorney upon surrender of this certificate if properly endorsed. This certificate is not valid unless countersigned by the Transfer Agent and
registered by the registrar of the Corporation.  

WITNESS the seal of the Corporation and the facsimile signature of its duly authorized officers.  

Dated:                         , 2005  

	
	 	 	 	

	Secretary	 	 	 	Chief Executive Officer
	

 	
 	

 	
 	

 
	
	 	 	 	 
	Transfer Agent	 	 	 	 

MDC Acquisition Partners Inc.

CORPORATE SEAL

2005

DELAWARE  

        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	 	tenants by the entireties	 	 	 	
	 	 	 	

	JT TEN	 	as joint tenants with right of survivorship	 	 	 	(Cust)	 	 	 	(Minor)
	 	 	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. 

MDC Acquisition Partners Inc.  

        The Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, option or other
special rights of each class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the Common Stock
represented hereby are issued and shall be held subject to the terms and conditions applicable to the Common Stock. 

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)

                         Common Stock represented by the within Certificate, and do hereby irrevocably
constitute and appoint
                         Attorney, to transfer the said Common Stock on the books of the within named Corporation with full
power of substitution in the premises.  

	Dated	 	 	 	 	 	By:	 	 
	 	 	 	 	
	 	 	 	 	 	

	 	 	 	 	 	 	 	 	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:	
 	

 	
 	

 	
 	

 
	

By:	
 	

 	
 	

 	
 	

 	
 	

 	
 	

 
	 	 	
	 	 	 	 	 	 
	THE SIGNATURE(S) SHOULD 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).	 	 	 	 

QuickLinks

Exhibit 4.2QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.3    
    

 
 

[FORM OF WARRANT CERTIFICATE]    
    

        THIS WARRANT CERTIFICATE (I) CANNOT BE TRANSFERRED OR EXCHANGED UNTIL 20 DAYS AFTER THE EARLIER TO OCCUR OF THE EXPIRATION OF THE UNDERWRITERS' OPTION TO
PURCHASE UP TO 1,500,000 ADDITIONAL UNITS TO COVER OVER-ALLOTMENTS OR THE EXERCISE IN FULL OR IN PART BY THE UNDERWRITERS OF SUCH OPTION (THE "DETACHMENT
DATE") UNLESS INCLUDED WITH A SHARE OF COMMON STOCK OF MDC ACQUISITION PARTNERS INC. AS PART OF A UNIT AND (II) CANNOT BE EXERCISED IN WHOLE OR IN PART UNTIL THE
LATER OF THE COMPANY'S COMPLETION OF A BUSINESS COMBINATION OR                        , 2006. 

EXERCISABLE
ONLY IF COUNTERSIGNED BY THE WARRANT

AGENT AS PROVIDED HEREIN. 

Warrant
Certificate evidencing 

Warrants
to Purchase Common Stock, par value $.0001, as described herein. 

MDC
Acquisition Partners Inc. 

	No.	 	 	 	CUSIP No.

VOID AFTER 5:00 P.M., NEW YORK CITY TIME,

ON                , 2010, OR UPON EARLIER REDEMPTION  

        This certifies that                        , or its registered
assigns, is the registered holder of                        warrants to purchase certain securities (each a
"Warrant"). Each Warrant entitles the holder thereof, subject to the provisions contained herein and in the Warrant Agreement (as defined below), to
purchase from MDC Acquisition Partners Inc., a Delaware corporation (the "Company"), one share of the Company's Common Stock (each a
"Share"), at the Exercise Price set forth below. The exercise price of each Warrant (the "Exercise
Price") shall be $6.00 initially, subject to adjustments as set forth in the Warrant Agreement (as defined below). 

        Subject
to the terms of the Warrant Agreement, each Warrant evidenced hereby may be exercised in whole, but not in part, at any time, as specified herein, on any Business Day (as defined
below) occurring during the period (the "Exercise Period") commencing on the later of the Company's completion of a Business Combination (as defined
below) or                        , 2006 and ending at 5:00 P.M., New York City time,
on                        , 2010 (the "Expiration Date"). Each Warrant
remaining unexercised after 5:00 P.M., New York City time on the Expiration Date shall become void, and all rights of the holder of this Warrant Certificate evidencing such Warrant shall cease. 

        The
holder of the Warrants represented by this Warrant Certificate may exercise any Warrant evidenced hereby by delivering, not later than 5:00 P.M., New York City time, on any
Business Day during the Exercise Period (the "Exercise Date") to Continental Stock Transfer & Trust Company (the "Warrant
Agent", which term includes any successor warrant agent under the Warrant Agreement described below) at its corporate trust department at 17 Battery Place, New York, NY 10004,
(i) this Warrant Certificate and the Warrants to be exercised (the "Book-Entry Warrants") free on the records of The Depository Trust
Company (the "Depository") to an account of the Warrant Agent at the Depository designated for such purpose in writing by the Warrant Agent to the
Depository, (ii) an election to purchase ("Election to Purchase"), substantially in the form included on the reverse of hereof, as applicable
(A) by the holder hereof on the reverse of this Warrant Certificate or (B) properly executed by the institution in whose account the Warrant is recorded on the records of the Depository
(the "Participant") and (iii) the Exercise Price for each Warrant to be exercised in lawful money of the United States of America by certified or
official bank check or by bank wire transfer in immediately available funds. If any of (a) this Warrant Certificate or the Book-Entry Warrants, (b) the Election to Purchase,
or (c) the Exercise Price therefor, is received by the Warrant Agent after 

 

5:00 P.M.,
New York City, the Warrants will be deemed to be received and exercised on the Business Day next succeeding the date such items are received and such date shall be the the Exercise
Date for purposes hereof. If the date such items are received is not a Business Day, the Warrants will be deemed to be received and exercised on the next succeeding day which is a Business Day and
such dated shall be the Exercise Date for purposes hereof. If the Warrants to be exercised are received or deemed to be received after the Expiration Date, the exercise thereof will be null and void
and any funds delivered to the Warrant Agent will be returned to the holder as soon as practicable. In no event will interest accrue on funds deposited with the Warrant Agent in respect of an exercise
or attempted exercise of Warrants. The validity of any exercise of Warrants will be determined by the Warrant Agent in its sole discretion and such determination will be final and binding upon the
holder of the Warrants and the Company. Neither the Warrant Agent nor the Company shall have any obligation to inform a holder of Warrants of the invalidity of any exercise of Warrants. 

        As
used herein, the term "Business Day" means any day that is not a Saturday or Sunday and is not a United States federal holiday or a day
on which banking institutions generally are authorized or obligated by law or regulation to close in New York City. 

        As
used herein, the term "Business Combination" shall mean the acquisition by the Company, whether by merger, capital stock exchange,
asset or stock acquisition or other similar business combination of one or more operating businesses (collectively, the "Target Business") having
collectively, a fair market value (as calculated in accordance with the Company's Amended and Restated Certificate of Incorporation) at least equal to 80% of the Company's net assets at the time of
such merger, capital stock exchange, asset or stock acquisition or other similar business combination; provided, that any acquisition of multiple
operating businesses shall occur contemporaneously with one another. 

        Warrants
may be exercised only in whole numbers of Warrants. No fractional shares of Common Stock are to be issued upon the exercise of any Warrant, but rather the number of shares of
Common Stock to be issued shall be rounded up to the nearest whole number. If fewer than all of the Warrants evidenced by this Warrant Certificate are exercised, a new Warrant Certificate for the
number of Warrants remaining unexercised shall be executed by the Company and countersigned by the Warrant Agent as provided in Section 2 of the Warrant Agreement, and delivered to the holder
of this Warrant Certificate at the address specified on the books of the Warrant Agent or as otherwise specified by such Registered Holder. 

        This
Warrant Certificate is issued under and in accordance with the Warrant Agreement, dated as of                        , 2005 (the
"Warrant
Agreement"), between the Company and the Warrant Agent and is subject to the terms and provisions contained in the Warrant Agreement, to all of which terms and provisions the
holder of this Warrant Certificate and the beneficial owners of the Warrants represented by this Warrant Certificate consent by acceptance hereof. Copies of the Warrant Agreement are on file and can
be inspected at the above-mentioned office of the Warrant Agent and at the office of the Company at 18 W. 18th Street, 11th Floor, New York, NY 10011. 

        At
any time during the Exercise Period, the Company may, at its option, redeem all (but not part) of the then outstanding Warrants upon giving notice in accordance with the terms of the
Warrant Agreement (the "Redemption Notice"), at the price of $0.01 per Warrant (the "Redemption Price");  provided, that the last sales price of the Shares has been at least $11.50 per Share, on any twenty (20) trading days within a thirty
(30) trading day period ending on the third Business Day prior to the date on which the Redemption Notice is given. In the event the Company shall elect to redeem all of the then outstanding
Warrants, the Company shall fix a date for such redemption (the "Redemption Date"); provided, that such
date shall occur prior to the expiration of the Exercise Period. The Warrants may be exercised in accordance with the terms of this Agreement at any time after a Redemption Notice shall have been
given by the Company; provided, however, that no Warrants may be exercised 

2

 

subsequent
to the expiration of the Exercise Period; provided, further, that all rights whatsoever with respect to the Warrants shall cease on the
Redemption Date, other than to the right to receive the Redemption Price. 

        The
accrual of dividends, if any, on the Shares issued upon the valid exercise of any Warrant will be governed by the terms generally applicable to such Shares. From and after the
issuance of such Shares, the former holder of the Warrants exercised will be entitled to the benefits generally available to other holders of Shares and such former holder's right to receive payments
of dividends and any other amounts payable in respect of the Shares shall be governed by, and shall be subject to, the terms and provisions generally applicable to such Shares. 

        The
Exercise Price and the number of Shares purchasable upon the exercise of each Warrant shall be subject to adjustment as provided pursuant to Section 4 of the Warrant
Agreement. 

        Prior
to the Detachment Date, the Warrants represented by this Warrant Certificate may be exchanged or transferred only together with the Shares to which such Warrant is attached
(together, a "Unit"), and only for the purpose of effecting, or in conjunction with, an exchange or transfer of such Unit. Additionally, prior to the
Detachment Date, each transfer of such Unit on the register of the Units shall operate also to transfer the Warrants included in such Units. From and after the Detachment Date, the above provisions
shall be of no further force and effect. Upon due presentment for registration of transfer or exchange of this Warrant Certificate at the stock transfer division of the Warrant Agent, the Company
shall execute, and the Warrant Agent shall countersign and deliver, as provided in Section 5 of the Warrant Agreement, in the name of the designated transferee one or more new Warrant
Certificates of any authorized denomination evidencing in the aggregate a like number of unexercised Warrants, subject to the limitations provided in the Warrant Agreement. 

        Neither
this Warrant Certificate nor the Warrants evidenced hereby shall entitle the holder hereof or thereof to any of the rights of a holder of the Shares, including, without
limitation, the right to receive dividends, if any, or payments upon the liquidation, dissolution or winding up of the Company or to exercise voting rights, if any. 

        The
Warrant Agreement and this Warrant Certificate may be amended as provided in the Warrant Agreement including, under certain circumstances described therein, without the consent of
the holder of this Warrant Certificate or the Warrants evidenced thereby. 

        THIS WARRANT CERTIFICATE AND ALL RIGHTS HEREUNDER AND UNDER THE WARRANT AGREEMENT SHALL BE GOVERNED BY AND INTERPRETED AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS FORMED AND TO BE PERFORMED ENTIRELY WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW PROVISIONS THEREOF TO THE EXTENT SUCH
PRINCIPLES OR RULES WOULD REQUIRE OR PERMIT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION.

        This
Warrant Certificate shall not be entitled to any benefit under the Warrant Agreement or be valid or obligatory for any purpose, and no Warrant evidenced hereby may be exercised,
unless this Warrant Certificate has been countersigned by the manual signature of the Warrant Agent. 

3

 

        IN
WITNESS WHEREOF, the Company has caused this instrument to be duly executed. 

        Dated
as of                , 2005 

	 	 	 	 	MDC Aqusition Partners Inc.
	

 	
 	

 	
 	

By:	

 Authorized Officer
	

Continental Stock Transfer

& Trust Company,

as Warrant Agent	
 	

 	

 
	

By:	
 	

 Authorized Officer	
 	

 	

 

4

 
[REVERSE]

Instructions for Exercise of Warrant  

        To exercise the Warrants evidenced hereby, the holder or Participant must, by 5:00 P.M., New York City time, on the specified Exercise Date, deliver to the
Warrant Agent at its stock transfer division, a certified or official bank check or a wire transfer in immediately available funds, in each case payable to the Warrant Agent at Account No.
            , in an amount equal to the Exercise Price in full for the
Warrants exercised. In addition, the Warrant holder or Participant must provide the information required below and deliver this Warrant Certificate to the Warrant Agent at the address set forth below
and the Book-Entry Warrants to the Warrant Agent in its account with the Depository designated for such purpose. The Warrant Certificate and this Election to Purchase must be received by
the Warrant Agent by 5:00 P.M., New York time, on the specified Exercise Date. 

ELECTION
TO PURCHASE

TO BE EXECUTED IF WARRANT HOLDER DESIRES

TO EXERCISE THE WARRANTS EVIDENCED HEREBY 

        The
undersigned hereby irrevocably elects to exercise, on                        ,
            (the "Exercise Date"),
                        
Warrants, evidenced by this Warrant Certificate, to purchase,                        of the shares of Common Stock (each a
"Share") of MDC Acquisition
Partners Inc., a Delaware corporation (the "Company"), and represents that, on or before the Exercise Date, such holder has tendered payment for
such Shares by certified or official bank check or bank wire transfer in immediately available funds to the order of the Company c/o Continental Stock Transfer & Trust Company, 17 Battery
Place, New York, New York 10004, in the amount of $                        in accordance with the terms hereof. The undersigned
requests that said number of Shares be in fully registered form, registered in
such names and delivered, all as specified in accordance with the instructions set forth below. 

        If
said number of Shares is less than all of the Shares purchasable hereunder, the undersigned requests that a new Warrant Certificate evidencing the remaining balance of the Warrants
evidenced hereby be issued and delivered to the holder of the Warrant Certificate unless otherwise specified in the instructions below. 

	Dated:	 	 	 	 
	 	
	 	 
	 	Name	 	 	 
	 	 	
 (Please Print)

	 	 

	
 (Insert Social Security

or Other Identifying

Number of Holder)	 	 	 	 	 	 	 	 
	 	 	 	 	Address	 	 	 	 
	 	 	 	 	 	 	
	 	 
	 	 	 	 	 	 	
	 	 
	

Signature	
 	

 	
 	

 	
 	

 	
 	

 
	 	 	
	 	 	 	 	 	 

5

 

        This
Warrant may only be exercised by presentation to the Warrant Agent at one of the following locations: 

        By
hand at: 

        By
mail at: 

        The
method of delivery of this Warrant Certificate is at the option and risk of the exercising holder and the delivery of this Warrant Certificate will be deemed to be made only when
actually received by the Warrant Agent. If delivery is by mail, registered mail with return receipt requested, properly insured, is recommended. In all cases, sufficient time should be allowed to
assure timely delivery. 

(Instructions
as to form and delivery of Shares and/or Warrant Certificates) 

	Name in which Shares are to be registered if other than in the name of the registered holder of this Warrant Certificate:	 	
	 	 
	

Address to which Shares are to be mailed if other than to the address of the registered holder of this Warrant Certificate as shown on the books of the Warrant Agent:	
 	

 (Street Address)	
 	

 
	

 	
 	

 (City and State) (Zip Code)	
 	

 
	

Name in which Warrant Certificate evidencing unexercised Warrants, if any, are to be registered if other than in the name of the registered holder of this Warrant Certificate:	
 	

	
 	

 

6

 

	

Address to which certificate representing unexercised Warrants, if any, are to be mailed if other than to the address of the registered holder of this Warrant Certificate as shown on the books of the Warrant Agent:	
 	

 (Street Address)	
 	

 
	

 	
 	

 (City and State) (Zip Code)	
 	

 
	

 	
 	

Dated:	
 	

 
	

 	
 	

 Signature	
 	

 
	 	 	Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate. If Shares, or a Warrant Certificate evidencing unexercised Warrants, are to be issued in a name other
than that of the registered holder hereof or are to be delivered to an address other than the address of such holder as shown on the books of the Warrant Agent, the above signature must be guaranteed by a an Eligible Guarantor Institution (as that
term is defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).

SIGNATURE GUARANTEE  

	Name of Firm	 	 	 	 
	 	 	
	 	 
	

Address	
 	

 	
 	

 
	 	 	
	 	 
	

Area Code and Number	
 	

 	
 	

 
	 	 	
	 	 
	

Authorized Signature	
 	

 	
 	

 
	 	 	
	 	 
	

Name	
 	

 	
 	

 
	 	 	
	 	 
	

Title	
 	

 	
 	

 
	 	 	
	 	 

	Dated:	 	 	 	, 20	 	 	 	 
	 	 	
	 	 	 	
	 	 

7

 
ASSIGNMENT

(FORM
OF ASSIGNMENT TO BE EXECUTED IF WARRANT HOLDER

DESIRES TO TRANSFER WARRANTS EVIDENCED HEREBY) 

        FOR
VALUE RECEIVED,                        HEREBY SELL(S), ASSIGN(S) AND

TRANSFER(S) UNTO 

	(Please print name and address

including zip code of assignee)	 	(Please insert social security or

other identifying number of assignee)
	

the rights represented by the within Warrant Certificate and does hereby irrevocably constitute and
appoint                        Attorney to transfer said Warrant Certificate on the books of the Warrant Agent with full power of
substitution in the premises.
	

Dated:	
 	

 
	 	 	
 Signature
	 	 	(Signature must conform in all respects to the name of the holder as specified on the face of this Warrant Certificate and must bear a signature guarantee by an Eligible Guarantor Institution (as that term is defined
in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended).
 

SIGNATURE GUARANTEE  

	Name of Firm	 	 	 	 
	 	 	
	 	 
	

Address	
 	

 	
 	

 
	 	 	
	 	 
	

Area Code and Number	
 	

 	
 	

 
	 	 	
	 	 
	

Authorized Signature	
 	

 	
 	

 
	 	 	
	 	 
	

Name	
 	

 	
 	

 
	 	 	
	 	 
	

Title	
 	

 	
 	

 
	 	 	
	 	 

	Dated:	 	 	 	, 20	 	 	 	 
	 	 	
	 	 	 	
	 	 

8

QuickLinks

Exhibit 4.3

[FORM OF WARRANT CERTIFICATE]

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00091-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00091-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00091-of-00352.parquet"}]]