Document:

Exhibit
4.2

 

	NUMBER	SHARES
	C-	 

  

SEE
REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP
                 

 

CM
LIFE SCIENCES II INC.

 

CLASS
A COMMON STOCK

 

THIS
CERTIFIES THAT is the owner of fully paid and non-assessable shares of Class A common stock, par value $0.0001 per share
(the “Common Stock”), of CM Life Sciences II Inc., a Delaware corporation (the “Company”),
transferable on the books of the Company in person or by duly authorized attorney upon surrender of this certificate properly
endorsed.

 

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

 

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

  

	_____________________________________	_____________________________________
	Authorized
Signatory	Transfer Agent

 

     

     

    

 

CM
LIFE SCIENCES II INC.

 

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 equity 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
and all amendments thereto 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	 	 under Uniform
    Gifts to Minors Act
			survivorship and not as tenants in common	 	_______________________________

    (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 Common Stock represented by the within Certificate, and hereby irrevocably constitutes and

appoints

 

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

 

	Dated:	_____________________________________________
	 	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.

  

    2

     

    

 

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 UNDER THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (OR ANY SUCCESSOR RULE).

 

As
more fully described in, and subject to the terms and conditions described in, the Company’s final prospectus for its initial
public offering 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 the Company’s initial public offering only in the event that
(i) the Company redeems the shares of Common Stock sold in the Company’s initial public offering and liquidates because
it does not consummate an initial business combination by the date set forth (the “Last Date”) in the Company’s
Amended and Restated Certificate of Incorporation, as the same may be amended from time to time (the “Charter”), (ii)
the Company redeems the shares of Common Stock sold in its initial public offering properly submitted in connection with a stockholder
vote to amend the Charter to modify the substance or timing of the Company’s obligation to redeem 100% of the Common Stock
if it does not consummate an initial business combination by the Last Date or with respect to any other material provisions relating
to stockholders’ rights or pre-initial business combination activity, or (iii) if the holder(s) seek(s) to redeem for cash
his, her or its respective shares of 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.

 

 

3Exhibit
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

  

CM
Life Sciences II Inc.

  

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) (the “Warrants” and each, a “Warrant”) to purchase shares
of Class A common stock, $0.0001 par value (“Class A Common Stock”), of CM Life Sciences II Inc., 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 nonassessable
shares of Class A Common Stock as set forth below, at the exercise price (the “Exercise Price”) as determined
pursuant to the Warrant Agreement, payable in lawful money (or through “cashless exercise” as provided
for in the Warrant Agreement) of the United States of America 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
whole Warrant is initially exercisable for one fully paid and non-assessable share of Class A Common Stock. Fractional shares
shall not be issued upon exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional
interest in a share of Class A Common Stock, the Company shall, upon exercise, round down to the nearest whole number the number
of shares of Class A Common Stock to be issued to the Warrant holder. The number of shares of Class A Common Stock issuable upon
exercise of the Warrants is subject to adjustment upon the occurrence of certain events as set forth in the Warrant Agreement.

 

The
initial Exercise Price per share of Class A Common Stock for any Warrant is equal to $11.50 per share. The Exercise Price is subject
to adjustment upon the occurrence of certain events as 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. The Warrants may be redeemed, subject
to certain conditions, as set forth in the Warrant Agreement.

 

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.

 

	 	CM LIFE
    SCIENCES II INC.
	 	 
	 	By:	                    
	 		Name:
	 		Title:
	 	 	 
	 	CONTINENTAL STOCK TRANSFER &
    TRUST COMPANY, as Warrant Agent
	 	 
	 	By:	 
	 		Name:
	 		Title:

  

    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 Class A 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,
respectively) 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 issuance of the shares of Class A Common Stock to be issued upon exercise is effective
under the Securities Act and (ii) a prospectus thereunder relating to the shares of Class A 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 Class A 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 Class A Common Stock, the Company
shall, upon exercise, round down to the nearest whole number of shares of Class A 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.

 

    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 Class A Common Stock and herewith tenders payment for such shares of Class A Common Stock to the order of CM Life Sciences
II Inc. (the “Company”) in the amount of $                in
accordance with the terms hereof. The undersigned requests that a certificate for such shares of Class A Common Stock be registered
in the name of                , whose address is
                 and that such shares of Class
A Common Stock be delivered to                 whose
address is . If said number of shares of Class A Common Stock is less than all of the shares of Class A Common Stock purchasable
hereunder, the undersigned requests that a new Warrant Certificate representing the remaining balance of such shares of Class A
Common Stock 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 6.2 of the Warrant Agreement and a holder thereof
elects to exercise its Warrant pursuant to a Make-Whole Exercise, the number of shares of Class A Common Stock that this Warrant
is exercisable for shall be determined in accordance with subsection 3.3.1(c) or Section 6.2 of the Warrant Agreement,
as applicable.

  

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 of Class A Common Stock 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 of Class A Common Stock 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 may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the
number of shares of Class A Common Stock 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 Class A Common Stock. If said number of shares is less than
all of the shares of Class A 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 of Class A Common Stock be registered
in the name of                , whose address is                   
and that such Warrant Certificate be delivered to                   ,
whose address is                    .

   

[Signature
Page Follows]

 

    4

     

    

  

	Date:           , 20	 
	 	Signature	                         
	 	 
	 	 
	 	 
	 	(Address) 
	 	 	 
	 	 
	 	(Tax Indentification 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 S.E.C. RULE 17Ad-15 UNDER THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).

 

 

 5

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00321-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00321-of-00352.parquet"}]]