Document:

Exhibit
10.4

AMENDMENT
NO. 2

TO

2018
STOCK OPTION AND GRANT PLAN

OF

CENTURY
THERAPEUTICS, INC.

WHEREAS, up to 8,500,000
shares of Common Stock, par value $0.0001 per share, of Century Therapeutics, Inc., a Delaware corporation (the “Company”),
are currently reserved under the Company’s 2018 Stock Option and Grant Plan (the “Plan”); and

WHEREAS, the Board
of Directors of the Company (the “Board”), pursuant to a Written Consent of the Board dated as of June 21, 2019,
approved and authorized this Amendment No. 2 to the Plan, pursuant to which the number of shares reserved under the Plan shall
be increased as set forth herein.

NOW THEREFORE, Section
3(a) of the Plan is hereby amended and restated as follows:

“Stock Issuable.
The maximum number of Shares reserved and available for issuance under the Plan shall be 15,260,038 Shares, subject to adjustment
as provided in Section 3(b). For purposes of this limitation, the Shares underlying any Awards that are forfeited, canceled, reacquired
by the Company prior to vesting, satisfied without the issuance of Stock or otherwise terminated (other than by exercise) and Shares
that are withheld upon exercise of an Option or settlement of an Award to cover the exercise price or tax withholding shall be
added back to the Shares available for issuance under the Plan. Subject to such overall limitations, Shares may be issued up to
such maximum number pursuant to any type or types of Award, and no more than 15,260,038 Shares may be issued pursuant to Incentive
Stock Options. The Shares available for issuance under the Plan may be authorized but unissued Shares or Shares reacquired by the
Company. Beginning on the date that the Company becomes subject to Section 162(m) of the Code, Options with respect to no more
than 15,260,038 Shares shall be granted to any one individual in any calendar year period.”

Except as expressly
set forth above, all of the terms and provisions of the Plan shall remain in full force and effect and all references to the Plan
shall hereinafter be deemed to be references to the Plan as amended by this Amendment.Exhibit
10.5

AMENDMENT
NO. 3

TO

2018
STOCK OPTION AND GRANT PLAN

OF

CENTURY
THERAPEUTICS, INC.

WHEREAS, up to 15,260,038
shares of Common Stock, par value $0.0001 per share, of Century Therapeutics. Inc., a Delaware corporation (the “Company”),
arc currently reserved under the Company’s 2018 Stock Option and Grant Plan (the “Plan”); and

WHEREAS, the Board
of Directors of the Company (the “Board”), pursuant at a meeting held on March 18, 2019, approved and authorized
this Amendment No. 3 to the Plan, pursuant to which the number of shares reserved under the Plan shall be increased as set forth
herein.

NOW THEREFORE, Section
3(a) of the Plan is hereby amended and restated as follows:

“Stock Issuable.
The maximum number of Shares reserved and available for issuance under the Plan shall be 16,476,891 Shares, subject to adjustment
as provided in Section 3(b). For purposes of this limitation, the Shares underlying
any Awards that are forfeited, canceled, reacquired by the Company prior to vesting, satisfied without the issuance of Stock or
otherwise terminated (other
than by exercise) and Shares that are withheld upon exercise of an Option or settlement of an Award to cover the exercise price
or tax withholding shall be
added back to the Shares available for issuance under the Plan. Subject to such overall limitations, Shares may be issued up to
such maximum number pursuant
to any type or types of Award, and no more than 16,476,891 Shares may be
issued pursuant to Incentive Stock Options. The Shares available for issuance
under the Plan may be authorized but unissued Shares or Shares reacquired by
the Company. Beginning on the date that the Company becomes subject to
Section I62(m) of the Code, Options with respect to no more than 16,476,891
Shares shall be granted to any one individual in any calendar year period.”

Except as expressly
set forth above, all of the terms and provisions of the Plan shall remain in full force and effect and all references to the Plan
shall hereinafter be deemed to be references to the Plan as amended by this Amendment.Exhibit
10.6

AMENDMENT

NO. 4 TO

2018
STOCK OPTION AND GRANT

PLAN OF

CENTURY
THERAPEUTICS, INC.

WHEREAS, up to 16,476,891
shares of Common Stock, par value $0.0001 per share, of Century Therapeutics, Inc., a Delaware corporation (the “Company”),
are currently reserved under the Company’s 2018 Stock Option and Grant Plan (the “Plan”); and

WHEREAS, the
Board of Directors of the Company (the “Board”), pursuant at a meeting held on December 16, 2020, approved and
authorized this Amendment No. 4 to the Plan, pursuant to which the number of shares reserved under the Plan shall be
increased as set forth herein.

NOW THEREFORE,
Section 3(a) of the Plan is hereby amended and restated as follows:

“Stock Issuable.
The maximum number of Shares reserved and available for issuance under the Plan shall be 19,498,781 Shares, subject to adjustment
as provided in Section 3(b). For purposes of this limitation,
the Shares underlying any Awards that are forfeited, canceled, reacquired by the Company prior to vesting, satisfied without the
issuance of Stock
or otherwise terminated (other than by exercise) and Shares that are withheld upon exercise of an Option or settlement of an Award
to cover
the exercise price or tax withholding shall be added back to the Shares available for issuance under the Plan. Subject to such
overall limitations, Shares may be issued up to such maximum number pursuant to any type
or types of Award, and no more than 19,498,781 Shares may be issued pursuant to Incentive Stock Options. The Shares available for
issuance under the Plan may be authorized but unissued Shares or Shares
reacquired by the Company. Beginning on the date that the Company becomes subject to Section 162(m) of the Code, Options with respect
to
no more than 19,498,781 Shares shall be granted to any one individual in any calendar year period.”

Except as expressly
set forth above, all of the terms and provisions of the Plan shall remain in full force and effect and all references to the Plan
shall hereinafter be deemed to be references to the Plan as amended by this Amendment.Exhibit
10.7

AMENDMENT

NO. 5 TO

2018
STOCK OPTION AND GRANT

PLAN OF

CENTURY
THERAPEUTICS, INC.

WHEREAS, up to 19,498,781
shares of Common Stock, par value $0.0001 per share, of Century Therapeutics, Inc., a Delaware corporation (the “Company”),
are currently reserved under the Century Therapeutics, Inc. 2018 Stock Option and Grant Plan (the “Plan”); and

WHEREAS, the Board
of Directors of the Company (the “Board”), acting by unanimous written consent dated as of February 25, 2021,
approved and authorized this Amendment No. 5 to the Plan, pursuant to which the number of shares reserved under the Plan shall
be increased as set forth herein.

NOW THEREFORE, Section
3(a) of the Plan is hereby amended and restated as follows:

“Stock Issuable.
The maximum number of Shares reserved and available for issuance under the Plan shall be 23,498,781 Shares, subject to adjustment
as provided in Section 3(b). For purposes of this limitation, the Shares underlying any Awards that are forfeited, canceled, reacquired
by the Company prior to vesting, satisfied without the issuance of Stock or otherwise terminated (other than by exercise) and Shares
that are withheld upon exercise of an Option or settlement of an Award to cover the exercise price or tax withholding shall be
added back to the Shares available for issuance under the Plan. Subject to such overall limitations, Shares may be issued up to
such maximum number pursuant to any type or types of Award, and no more than 23,498,781 Shares may be issued pursuant to Incentive
Stock Options. The Shares available for issuance under the Plan may be authorized but unissued Shares or Shares reacquired by the
Company. Beginning on the date that the Company becomes subject to Section 162(m) of the Code, Options with respect to no more
than 23,498,781 Shares shall be granted to any one individual in any calendar year period.”

Except as expressly
set forth above, all of the terms and provisions of the Plan shall remain in full force and effect and all references to the Plan
shall hereinafter be deemed to be references to the Plan as amended by this Amendment.Exhibit 10.10

 

RESTRICTED
STOCK AWARD NOTICE

UNDER THE CENTURY
THERAPEUTICS, INC.

2018 STOCK
OPTION AND GRANT
PLAN

Pursuant
to the Century Therapeutics, Inc. 2018 Stock Option and Grant Plan (the “Plan”), Century Therapeutics, Inc., a Delaware
corporation (together with any successor, the “Company”), hereby grants, sells and issues to the individual named below,
the Shares at the Per Share Purchase Price, subject to the terms and conditions set forth in this Restricted Stock Award Notice
(the “Award Notice”), the attached Restricted Stock Agreement (the “Agreement”) and the Plan. The Grantee
agrees to the provisions set forth herein and acknowledges that each such provision is a material condition of the Company’s
agreement to issue and sell the Shares to him or her. The Company hereby acknowledges receipt of $[ ______] in full payment
for the Shares. All references to share prices and amounts herein shall be equitably adjusted to reflect stock splits, stock dividends,
recapitalizations, mergers, reorganizations and similar changes affecting the capital stock of the Company, and any shares of capital
stock of the Company received on or in respect of Shares in connection with any such event (including any shares of capital stock
or any right, option or warrant to receive the same or any security convertible into or exchangeable for any such shares or received
upon conversion of any such shares) shall be subject to this Agreement on the same basis and extent at the relevant time as the
Shares in respect of which they were issued, and shall be deemed Shares as if and to the same extent they were issued at the date
hereof.

 

	Name of Grantee:	__________________(the “Grantee”)
	 	 
	No. of Shares:	____________ Shares of Common Stock (the “Shares”)
	 	 
	Grant Date:	___________  __, __
	 	 
	Date of Purchase of Shares:	___________  __, __
	 	 
	Vesting Commencement Date:	___________  __, __ (the “Vesting Commencement Date”)
	 	 
	Per Share Purchase Price:	$_______(the “Per Share Purchase Price”)
	 	 
	1.	
        Vesting Schedule: 25 percent of the Shares shall
        vest on the first anniversary of the Vesting Commencement Date; provided that the Grantee continues to have a Service Relationship
        with the Company at such time. Thereafter, the remaining 75 percent of the Shares shall vest in 36 equal monthly installments following
        the first anniversary of the Vesting Commencement Date, provided the Grantee continues to have a Service Relationship with the
        Company at such time. Notwithstanding anything in the Agreement to the contrary in the case of a Sale 

        

 

    

     

    

 

	 	Event, the Shares of Restricted
        Stock shall be treated as provided in Section 3(c) of the Plan.

 

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RESTRICTED
STOCK AGREEMENT

UNDER THE CENTURY
THERAPEUTICS, INC.

2018 STOCK
OPTION AND GRANT
PLAN

 

All capitalized terms used herein and
not otherwise defined shall have the respective meanings set forth in the Award Notice and the Plan.

 

		2.	Purchase and Sale of Shares; Vesting; Investment Representations.

 

(a)   
Purchase and Sale. The Company hereby sells to the Grantee, and the Grantee hereby purchases from the Company, the
number of Shares set forth in the Award Notice for the Per Share Purchase Price.

 

(b)   
Vesting. Initially, all of the Shares are non-transferable and subject to a substantial risk of forfeiture and are
Shares of Restricted Stock. The risk of forfeiture shall lapse with respect to the Shares on the respective dates indicated on
the Vesting Schedule set forth in the Award Notice.

 

(c)   
Investment Representations. In connection with the purchase and sale of the Shares contemplated by Section 1(a) above,
the Grantee hereby represents and warrants to the Company as follows:

 

(i)   
The Grantee is purchasing the Shares for the Grantee’s own account for investment only, and not for resale or with
a view to the distribution thereof.

 

(ii)   
The Grantee has had such an opportunity as he or she has deemed adequate to obtain from the Company such information as
is necessary to permit him or her to evaluate the merits and risks of the Grantee’s investment in the Company and has consulted
with the Grantee’s own advisers with respect to the Grantee’s investment in the Company.

 

(iii)   
The Grantee has sufficient experience in business, financial and investment matters to be able to evaluate the risks involved
in the purchase of the Shares and to make an informed investment decision with respect to such purchase.

 

(iv)   
The Grantee can afford a complete loss of the value of the Shares and is able to bear the economic risk of holding such
Shares for an indefinite period.

 

(v)   
The Grantee understands that the Shares are not registered under the Act (it being understood that the Shares are being
issued and sold in reliance on the exemption provided in Rule 701 thereunder) or any applicable state securities or “blue
sky” laws and may not be sold or otherwise transferred or disposed of in the absence of an effective registration statement
under the Act and under any applicable state securities or “blue sky” laws (or exemptions from the registration requirements
thereof). The Grantee further acknowledges that certificates representing the Shares will bear 

 

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restrictive legends reflecting the foregoing
and/or that book entries for uncertificated Shares will include similar restrictive notations.

 

(vi)   
The Grantee has read and understands the Plan and acknowledges and agrees that the Shares are subject to all of the relevant
terms of the Plan, including without limitation, the transfer restrictions set forth in Section 9 of the Plan.

 

(vii)  
The Grantee understands and agrees that the Company has a right of first refusal with respect to the Shares pursuant to
Section 9(b) of the Plan.

 

(viii)  
The Grantee understands and agree that the Company has certain repurchase rights with respect to the Shares pursuant to
Section 9(c) of the Plan.

 

(ix)   
The Grantee understands and agrees that the Grantee may not sell or otherwise transfer or dispose of the Shares for a period
of time following the effective date of a public offering by the Company as described in Section 9(f) of the Plan.

 

3.            Repurchase
Right. Upon a Termination Event, the Company shall have the right to repurchase Shares of Restricted Stock that are
unvested as of the date of such Termination Event as set forth in Section 9(c) of the Plan.

 

4.            Restrictions
on Transfer of Shares. The Shares (whether or not vested) shall be subject to certain transfer restrictions and other limitations
including, without limitation, the provisions contained in Section 9 of the Plan.

 

5.            Incorporation
of Plan. Notwithstanding anything herein to the contrary, this Restricted Stock Award shall be subject to and governed by
all the terms and conditions of the Plan.

 

		6.	Miscellaneous Provisions.

 

(a)   
Record Owner; Dividends. The Grantee and any Permitted Transferees, during the duration of this Agreement, shall
be considered the record owners of and shall be entitled to vote the Shares if and to the extent the Shares are entitled to voting
rights. The Grantee and any Permitted Transferees shall be entitled to receive all dividends and any other distributions declared
on the Shares; provided, however, that the Company is under no duty to declare any such dividends or to make any
such distribution.

 

(b)   
Section 83(b) Election. The Grantee shall consult with the Grantee’s tax advisor to determine whether it would
be appropriate for the Grantee to make an election under Section 83(b) of the Code with respect to this Award. Any such election
must be filed with the Internal Revenue Service within 30 days of the date of this Award. If the Grantee makes an election under
Section 83(b) of the Code, the Grantee shall give prompt notice to the Company (and provide a copy of such election to the Company).

 

(c)   
Equitable Relief. The parties hereto agree and declare that legal remedies may be inadequate to enforce the provisions
of this Agreement and that equitable relief,

 

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 including specific performance and injunctive
relief, may be used to enforce the provisions of this Agreement.

 

(d)   
Change and Modifications. This Agreement may not be orally changed, modified or terminated, nor shall any oral waiver
of any of its terms be effective. This Agreement may be changed, modified or terminated only by an agreement in writing signed
by the Company and the Grantee.

 

(e)   
Governing Law. This Agreement shall be governed by and construed in accordance with the General Corporation Law of
the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in
accordance with the internal laws of New York, without regard to conflict of law principles that would result in the application
of any law other than the law of the State of New York.

 

(f)   
Headings. The headings are intended only for convenience in finding the subject matter and do not constitute part
of the text of this Agreement and shall not be considered in the interpretation of this Agreement.

 

(g)   
Saving Clause. If any provision(s) of this Agreement shall be determined to be illegal or unenforceable, such determination
shall in no manner affect the legality or enforceability of any other provision hereof.

 

(h)   
Notices. All notices, requests, consents and other communications shall be in writing and be deemed given when delivered
personally, by telex or facsimile transmission or when received if mailed by first class registered or certified mail, postage
prepaid. Notices to the Company or the Grantee shall be addressed as set forth underneath their signatures below, or to such other
address or addresses as may have been furnished by such party in writing to the other.

 

(i)   
Benefit and Binding Effect. This Agreement shall be binding upon and shall inure to the benefit of the parties hereto,
their respective successors, assigns, and legal representatives. The Company has the right to assign this Agreement, and such assignee
shall become entitled to all the rights of the Company hereunder to the extent of such assignment.

 

(j)   
Counterparts. For the convenience of the parties and to facilitate execution, this Agreement may be executed in two
or more counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same document.

 

(k)   
Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes
all prior agreements and discussions between the parties concerning such subject matter.

 

		7.	Dispute Resolution.

 

(a)    Except
as provided below, any dispute arising out of or relating to the Plan or the Shares, this Agreement, or the breach,
termination or validity of the Plan, the Shares or this Agreement, shall be finally settled by binding arbitration conducted
expeditiously in

 

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 accordance with the J.A.M.S./Endispute Comprehensive Arbitration Rules and Procedures (the “J.A.M.S.
Rules”).The arbitration shall be governed by the United States Arbitration Act, 9 U.S.C. Sections 1 - 16, and
judgment upon the award rendered by the arbitrators may be entered by any court having jurisdiction thereof. The place of
arbitration shall be New York, New York.

 

(b)   
The arbitration shall commence within 60 days of the date on which a written demand for arbitration is filed by any party
hereto. In connection with the arbitration proceeding, the arbitrator shall have the power to order the production of documents
by each party and any third-party witnesses. In addition, each party may take up to three depositions as of right, and the arbitrator
may in his or her discretion allow additional depositions upon good cause shown by the moving party. However, the arbitrator shall
not have the power to order the answering of interrogatories or the response to requests for admission. In connection with any
arbitration, each party to the arbitration shall provide to the other, no later than seven business days before the date of the
arbitration, the identity of all persons that may testify at the arbitration and a copy of all documents that may be introduced
at the arbitration or considered or used by a party’s witness or expert. The arbitrator’s decision and award shall
be made and delivered within six months of the selection of the arbitrator. The arbitrator’s decision shall set forth a reasoned
basis for any award of damages or finding of liability. The arbitrator shall not have power to award damages in excess of actual
compensatory damages and shall not multiply actual damages or award punitive damages, and each party hereby irrevocably waives
any claim to such damages.

 

(c)   
The Company, the Grantee, each party to the Agreement and any other holder of Shares issued pursuant to this Agreement (each,
a “Party”) covenants and agrees that such party will participate in the arbitration in good faith. This Section 6 applies
equally to requests for temporary, preliminary or permanent injunctive relief, except that in the case of temporary or preliminary
injunctive relief any party may proceed in court without prior arbitration for the limited purpose of avoiding immediate and irreparable
harm.

 

(d)   
Each Party (i) hereby irrevocably submits to the jurisdiction of any United States District Court of competent jurisdiction
for the purpose of enforcing the award or decision in any such proceeding, (ii) hereby waives, and agrees not to assert, by way
of motion, as a defense, or otherwise, in any such suit, action or proceeding, any claim that it is not subject personally to the
jurisdiction of the above named courts, that its property is exempt or immune from attachment or execution (except as protected
by applicable law), that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action
or proceeding is improper or that this Agreement or the subject matter hereof may not be enforced in or by such court, and (iii)
hereby waives and agrees not to seek any review by any court of any other jurisdiction which may be called upon to grant an enforcement
of the judgment of any such court. Each Party hereby consents to service of process by registered mail at the address to which
notices are to be given. Each Party agrees that its, his or her submission to jurisdiction and its, his or her consent to service
of process by mail is made for the express benefit of each other Party. Final judgment against any Party in any such action, suit
or proceeding may be enforced in other jurisdictions by suit, action or proceeding on the judgment, or in any other manner provided
by or pursuant to the laws of such other jurisdiction.

 

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8.             Waiver of Statutory Information Rights. The Grantee understands and agrees that, but for the waiver made herein,
the Grantee would be entitled, upon written demand under oath stating the purpose thereof, to inspect for any proper purpose, and
to make copies and extracts from, the Company’s stock ledger, a list of its stockholders, and its other books and records,
and the books and records of subsidiaries of the Company, if any, under the circumstances and in the manner provided in Section
220 of the General Corporation Law of Delaware (any and all such rights, and any and all such other rights of the Grantee as may
be provided for in Section 220, the “Inspection Rights”). In light of the foregoing, until the first sale of Stock
of the Company to the general public pursuant to a registration statement filed with and declared effective by the Securities and
Exchange Commission under the Securities Act, the Grantee hereby unconditionally and irrevocably waives the Inspection Rights,
whether such Inspection Rights would be exercised or pursued directly or indirectly pursuant to Section 220 or otherwise, and covenants
and agrees never to directly or indirectly commence, voluntarily aid in any way, prosecute, assign, transfer, or cause to be commenced
any claim, action, cause of action, or other proceeding to pursue or exercise the Inspection Rights. The foregoing waiver shall
not affect any rights of a director, in his or her capacity as such, under Section 220. The foregoing waiver shall not apply to
any contractual inspection rights of the Grantee under any other written agreement between the Grantee and the Company.

 

[SIGNATURE PAGE FOLLOWS]

 

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The
foregoing Restricted Stock Agreement is hereby accepted and the terms and conditions thereof are hereby agreed to by the
undersigned as of the date of purchase of Shares above written.

 

CENTURY THERAPEUTICS, INC.

 

	By:	 	 
	 	Name:	 
	 	Title:	 
	 	 	 
	Address:	 

 

The undersigned hereby
acknowledges receiving and reviewing a copy of the Plan, including, without limitation, Section 9 thereof and understands
that the Shares granted hereby are subject to the terms of the Plan and of this Agreement. This Agreement is hereby accepted,
and the terms and conditions of the Plan, the Award Notice and this Agreement, SPECIFICALLY INCLUDING THE ARBITRATION
PROVISIONS SET FORTH IN SECTION 6 AND THE WAIVER OF STATUTORY INFORMATION RIGHTS SET FORTH IN SECTION 7 OF THIS AGREEMENT,
are hereby agreed to, by the undersigned as of the date first above written.

 

GRANTEE:

 

Name:

 

Address:

 

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