Document:

Exhibit 4.2

 

NUMBER

	C-	SHARES

 

SPECIMEN CLASS A COMMON STOCK CERTIFICATE

 

SEE REVERSE FOR

CERTAIN DEFINITIONS

 

CUSIP [●]

 

ONE EQUITY PARTNERS OPEN WATER I CORP.

 

INCORPORATED UNDER THE LAWS OF THE STATE
OF DELAWARE

CLASS A COMMON STOCK

 

This Certifies that ___________________________is the owner
of _______________

 

FULLY PAID AND NON-ASSESSABLE SHARES OF
THE PAR VALUE OF $0.0001 EACH OF THE CLASS A COMMON STOCK OF

ONE
EQUITY PARTNERS OPEN WATER I CORP.

(THE “COMPANY”)

 

subject to the Company’s amended
and restated certificate of incorporation, as the same may be amended from time to time, and transferable on the books of the
Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed.

 

The Company will be forced to redeem all
of its shares of Class A common stock if it is unable to complete a business combination within the period set forth in the
Company’s amended and restated certificate of incorporation, as the same may be amended from time to time, all as more fully
described in the Company’s final prospectus dated , 2021.

 

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

 

Witness the seal of the Company and the
facsimile signatures of its duly authorized officers.

 

Dated:                 

 

	Chief Executive Officer	[Corporate Seal]	Chief Financial Officer
	 	 	 
	 	Delaware	 

 

     

     

    

 

ONE EQUITY PARTNERS OPEN WATER I CORP.

 

The Company will furnish without charge to each stockholder
who so requests 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.
This certificate and the shares represented thereby are issued and shall be held subject to all the provisions of the Company’s
amended and restated certificate of incorporation, as the same may be amended from time to time and resolutions of the Board of
Directors providing for the issue of securities (copies of which may be obtained from the secretary of the Company), to all of
which the holder of this certificate by acceptance hereof assents.

 

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 sells, assigns and transfers unto

 

 

 

(PLEASE INSERT
SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

 

(PLEASE PRINT
OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

Shares of
the capital stock represented by the within Certificate, and does hereby irrevocably constitute and appoint

 

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

 

Dated:__________

 

	 	 
	 	Shareholder

 

NOTICE: THE SIGNATURE(S) 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) 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 its initial
public offering and liquidates because it does not consummate an initial business combination within the period of time set forth
in the Company’s amended and restated certificate of incorporation, as the same may be amended from time to time, (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 provide holders of the Class A common stock the right to have their shares redeemed in connection with the Company’s
initial business combination or to redeem 100% of the Class A common stock if the Company does not complete its initial business
combination within the time period set forth therein or with respect to any other provision relating to the rights of holders
of the Class A common stock 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.Exhibit 4.3

 

[Form of Warrant Certificate]

 

[FACE]

 

Number

 

Warrants

 

_____________________________________

 

THIS WARRANT SHALL BE VOID IF NOT EXERCISED
PRIOR TO

THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW

 

One
Equity Partners Open Water I Corp.

Incorporated Under the Laws of the State of Delaware

 

CUSIP [●]

 

Warrant Certificate

 

This
Warrant Certificate certifies that     , or registered assigns, is the registered holder
of     warrant(s) evidenced hereby (the “Warrants” and each, a “Warrant”)
to purchase shares of Class A common stock, $0.0001 par value per share (“Common Stock”), of One
Equity Partners Open Water I Corp., a Delaware corporation (the “Company”). Each Warrant entitles the
holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive from the Company that
number of fully paid and non-assessable shares of Common Stock as set forth below, at the exercise price (the “Exercise
Price”) as determined pursuant to the Warrant Agreement, payable by certified or official bank check payable to the
Company (or through “cashless exercise” as provided for in the Warrant Agreement) upon surrender of this Warrant Certificate
and payment of the Exercise Price at the office or agency of the Warrant Agent referred to below, subject to the conditions set
forth herein and in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined herein shall have the
meanings given to them in the Warrant Agreement.

 

Each Warrant is initially exercisable for
one fully paid and non-assessable share of Common Stock. The number of shares of Common Stock issuable upon exercise of the Warrants
is subject to adjustment upon the occurrence of certain events set forth in the Warrant Agreement.

 

The initial Exercise Price is equal to $11.50
per share. The Exercise Price is subject to adjustment upon the occurrence of certain events set forth in the Warrant Agreement.

 

Subject to the conditions set forth in the
Warrant Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of
such Exercise Period, such Warrants shall become void.

 

Reference is hereby made to the further
provisions of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for all purposes have
the same effect as though fully set forth at this place.

 

This Warrant Certificate shall not be valid
unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.

 

This Warrant Certificate shall be governed
by and construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles
thereof.

 

    A-1 

     

    

 

	 	ONE EQUITY
    PARTNERS OPEN WATER I CORP.
	 	 	 
	 	By:	 	 
	 	Name:	 	Jessica Marion
	 	Title:	 	Chief Financial Officer

 

		CONTINENTAL STOCK TRANSFER &
                                         TRUST COMPANY, as Warrant Agent

 

	 	 	 	 
	 	By:	 	 
	 	Name:	 	 
	 	Title:	 	 

 

    A-2 

     

    

 

[FORM OF WARRANT CERTIFICATE]

 

[REVERSE]

 

The Warrants evidenced by this Warrant Certificate
are part of a duly authorized issue of Warrants entitling the holder on exercise to receive shares of Common Stock and are issued
or to be issued pursuant to a Warrant Agreement dated as of [●], 2021 (the “Warrant Agreement”),
duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New York corporation, as warrant
agent (the “Warrant Agent”), which Warrant Agreement is hereby incorporated by reference in and made
a part of this instrument and is hereby referred to for a description of the rights, limitation of rights, obligations, duties
and immunities thereunder of the Warrant Agent, the Company and the holders (the words “holders” or “holder”
meaning the Registered Holders or Registered Holder) of the Warrants. A copy of the Warrant Agreement may be obtained by the holder
hereof upon written request to the Company. Defined terms used in this Warrant Certificate but not defined herein shall have the
meanings given to them in the Warrant Agreement.

 

Warrants may be exercised at any time during
the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise
them by surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed,
together with payment of the Exercise Price as specified in the Warrant Agreement (or through “cashless exercise” as
provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any
exercise of Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced
hereby, there shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number
of Warrants not exercised.

 

Notwithstanding anything else in this Warrant
Certificate or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a registration statement
covering the shares of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus
thereunder relating to the shares of Common Stock is current, except through “cashless exercise” as provided for in
the Warrant Agreement.

 

The Warrant Agreement provides that upon
the occurrence of certain events the number of shares of Common Stock issuable upon exercise of the Warrants set forth on the face
hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to
receive a fractional interest in a share of Common Stock, the Company shall, upon exercise, round down to the nearest whole number
of shares of Common Stock to be issued to the holder of the Warrant.

 

Warrant Certificates, when surrendered at
the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative
or attorney duly authorized in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant
Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing
in the aggregate a like number of Warrants.

 

Upon due presentation for registration of
transfer of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant Certificates of like
tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this
Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any tax or other governmental
charge imposed in connection therewith.

 

The Company and the Warrant Agent may deem
and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any notation
of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the holder(s) hereof,
and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither
the Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a stockholder of the Company.

 

    A-3 

     

    

 

ELECTION TO PURCHASE

 

(TO BE EXECUTED UPON EXERCISE OF WARRANT)

 

The undersigned hereby irrevocably elects
to exercise the right, represented by this Warrant Certificate, to receive shares of Common Stock and herewith tenders payment
for such shares to the order of One Equity Partners Open Water I Corp. (the “Company”) in the amount
of $          in accordance with the terms hereof. The undersigned requests that a certificate for such
shares be registered in the name of , whose address is and that such shares be delivered to whose address is . If said number of
shares is less than all of the shares of Common Stock purchasable hereunder, the undersigned requests that a new Warrant Certificate
representing the remaining balance of such shares be registered in the name of          , whose address
is and that such Warrant Certificate be delivered to          , whose address is . In the event that the
Warrant has been called for redemption by the Company pursuant to Section 6 of the Warrant Agreement and the Company
has required cashless exercise pursuant to Section 6.3 of the Warrant Agreement, the number of shares that this Warrant
is exercisable for shall be determined in accordance with subsection 3.3.1(b) and Section 6.3 of the Warrant
Agreement.

 

In the event that the Warrant is a Private
Placement Warrant that is to be exercised on a “cashless” basis pursuant to subsection 3.3.1(c) of the
Warrant Agreement, the number of shares that this Warrant is exercisable for shall be determined in accordance with subsection
3.3.1(c) of the Warrant Agreement.

 

In the event that the Warrant is to be exercised
on a “cashless” basis pursuant to Section 7.4 of the Warrant Agreement, the number of shares that this
Warrant is exercisable for shall be determined in accordance with Section 7.4 of the Warrant Agreement.

 

In the event that the Warrant (as such term
is defined in the Warrant Agreement) may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise
(i) the number of shares that this Warrant is exercisable for would be determined in accordance with the relevant section
of the Warrant Agreement which allows for such cashless exercise and (ii) the holder hereof shall complete the following:
The undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, through the cashless
exercise provisions of the Warrant Agreement, to receive shares of Common Stock. If said number of shares is less than all of the
shares of Common Stock purchasable hereunder (after giving effect to the cashless exercise), the undersigned requests that a new
Warrant Certificate representing the remaining balance of such shares be registered in the name of , whose address is and that
such Warrant Certificate be delivered to     , whose address is .

 

[Signature Page follows]

 

    A-4 

     

    

 

	Date:                    , 21	 
	 	 
	 	 
	 	

	 	(Signature)
	 	 
	 	

	 	 
	 	 
	 	

	 	

	 	 
	 	 
	 	(Address)
	 	 
	 	

	 	(Tax Identification Number)
	 	 
	 	 
	 	 
	Signature Guaranteed:	 
	 	 
	
	 
	 	 

 

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 SEC RULE 17Ad-15 (OR ANY SUCCESSOR RULE)) UNDER THE SECURITIES EXCHANGE
ACT, OF 1934, AS AMENDED.

 

    A-5 

     

    

 

EXHIBIT B

 

LEGEND

 

“THE SECURITIES REPRESENTED BY THIS
CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS, AND MAY NOT
BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND ANY
APPLICABLE STATE SECURITIES LAWS OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE. IN ADDITION, SUBJECT TO ANY ADDITIONAL LIMITATIONS
ON TRANSFER DESCRIBED IN THE LETTER AGREEMENT BY AND AMONG ONE EQUITY PARTNERS OPEN WATER I CORP. (THE “COMPANY ),
OEP OPEN WATER I HOLDINGS, LLC AND THE OTHER PARTIES THERETO, THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD
OR TRANSFERRED PRIOR TO THE DATE THAT IS THIRTY (30) DAYS AFTER THE DATE UPON WHICH THE COMPANY COMPLETES ITS INITIAL BUSINESS
COMBINATION (AS DEFINED IN SECTION 3 OF THE WARRANT AGREEMENT REFERRED TO HEREIN) EXCEPT TO A PERMITTED TRANSFEREE
(AS DEFINED IN SECTION 2 OF THE WARRANT AGREEMENT) WHO AGREES IN WRITING WITH THE COMPANY TO BE SUBJECT TO SUCH TRANSFER
PROVISIONS.

 

SECURITIES EVIDENCED BY THIS CERTIFICATE
AND SHARES OF CLASS A COMMON STOCK OF THE COMPANY ISSUED UPON EXERCISE OF SUCH SECURITIES SHALL BE ENTITLED TO REGISTRATION
RIGHTS UNDER A REGISTRATION AND SHAREHOLDER RIGHTS AGREEMENT TO BE EXECUTED BY THE COMPANY.”

 

No.          Warrants

 

    A-6

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