Document:

EX-10.12

 Exhibit 10.12 

CONFIDENTIAL 

MASTER SERVICES AGREEMENT 

THIS MASTER SERVICES AGREEMENT (the “Agreement”) is
entered into as of January 17, 2019, (the “Effective Date”) by and between VENTYX BIOSCIENCES, INC., a corporation organized under the laws of Delaware, having a
principal place of business at 662 Encinitas Blvd, Suite 250, Encinitas, CA 92024, USA (“Ventyx”), and BAYSIDE PHARMA, LLC, a corporation organized under the laws of California, having a principal place of business at
2600 Hilltop Drive, B-C219, Richmond, CA 94806, USA (“BaySide”). 

RECITALS 

WHEREAS, Ventyx is engaged in the development of pharmaceutical products; 

WHEREAS, BaySide has personnel, expertise and facilities suitable for conducting certain research and
development services on behalf of Ventyx; and 
 WHEREAS, Ventyx and BaySide desire to enter into this Agreement to
govern the relationship between the parties and to define the conditions under which BaySide will perform services in support of the research and development of one or more of Ventyx’s drug candidates. 

AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and premises
contained in this Agreement, the receipt and sufficiency of which are hereby expressly acknowledged, the parties hereto agree as follows: 
  

	1.	 DEFINITIONS 

1.1 “Ventyx Product” means a particular Ventyx drug candidate for which BaySide will conduct a Project, as identified
in the applicable Work Order. 
 1.2 “Project” has the meaning provided in Section 2.2. 

1.3 “Results” has the meaning provided in Section 2.5. 

1.4 “Services” means the particular tasks to be performed by BaySide for a given Project pursuant to this Agreement,
as more fully set out in the applicable Work Order. 
 1.5 “Work Order” means the document for a given Project under
which BaySide agrees to perform Services for such Project pursuant to this Agreement. Each Work Order will be agreed upon by the parties on a Project-by-Project basis as
set forth in Section 2.2 and attached to and made a part of this Agreement. 
 1.6 “Work Product” will mean any
and all results (including Results) and products (interim and/or final) of the Services performed by BaySide, whether tangible or intangible, including, without limitation, each and every invention, discovery, design, drawing, protocol, process,
technique, formula, trade secret, device, compound, substance, biological material, pharmaceutical, method, software program (including, without limitation, object code, source code, flow charts, algorithms and related documentation), listing,
routine, manual and specification, whether or not patentable or copyrightable, that are made, developed, perfected, designed, conceived or first reduced to practice by BaySide, either solely or jointly with others, in the course of or as a result of
performing the Services. 

  
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	2.	 SCOPE OF WORK 

2.1 Scope of Agreement. As a master form of contract, this Agreement allows the parties to contract for multiple Projects through
the issuance of multiple Work Orders (as discussed in Section 2.2 below), without having to re-negotiate the basic terms and conditions contained herein. 

2.2 Performance of Services. The specific Services to be performed by BaySide and the protocols to be provided by Ventyx for
each project under this Agreement (each, a “Project”) will be specified separately in writing on terms and in a form acceptable to the parties (each such writing, a “Work Order”). Each Work Order will
be signed by both parties and will set forth, upon terms mutually agreeable to the parties, the specific Services to be performed by BaySide, the time line and schedule for the performance of such Services and the compensation to be paid by Ventyx
to BaySide for the provision of such Services, as well as any other relevant terms and conditions. If a Project includes the development of specific Work Product, the specifications of such Work Product will be set forth in the relevant Work Order.
Each Work Order will be subject to the terms and conditions of this Agreement, in addition to the specific details set forth in such Work Order. To the extent any terms or provisions of a Work Order conflict with the terms or provisions of this
Agreement, the terms and provisions of this Agreement will control. The parties will attach a copy of each Work Order to Exhibit A of this Agreement and each such Work Order will be incorporated herein by reference. Any changes to such Work Order
will be in writing, executed by each party, attached to the original Work Order and incorporated therein and attached hereto. 
 2.3
Compliance with Work Orders and Law. BaySide agrees to perform the Services set forth in each Work Order in a competent and professional manner and in strict accordance with the terms and conditions contained in this Agreement and such Work
Order. BaySide will perform its obligations hereunder in conformance with all applicable federal, state and local statutes, rules and regulations and, if applicable, accepted standards of good laboratory practice (GLP), good clinical practice (GCP)
and/or current good manufacturing practice (cGMP). 
 2.4 Ventyx’s Approval of Subcontractors. BaySide will not
subcontract any of the Services under any Work Order without first obtaining Ventyx’s prior written consent. BaySide will at all times be responsible for the compliance of its permitted subcontractors with the terms and conditions of this
Agreement and the applicable Work Order. 
 2.5 Results. All data generated by BaySide or its employees, agents, consultants,
Ventyx-approved subcontractors or other representatives in the course of conducting a Project, whether in written, graphic or electronic form or contained in any computer database in any computer readable form (collectively, the
“Results”), will be owned solely by Ventyx. BaySide will record, or cause to be recorded, all Results in a timely, accurate and complete manner. All 

  
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 Results collected will be delivered to Ventyx by BaySide in a timely manner throughout the performance of
the Project, and in no event later than ten (10) working days after the date of completion or termination of such Project or later than ten (10) working days after the date on which Ventyx otherwise requests delivery of the Results. Ventyx
will have the right to review, publish, disclose and use any Results as Ventyx, in its sole discretion, deems appropriate, including, without limitation, in submission to any U.S. or foreign regulatory authority. Any copyrightable work created in
connection with the performance of a Project and contained in or relating to the Results will be considered a work made for hire, whether published or unpublished, and all rights therein will be the property of Ventyx as author and owner of
copyright in such work. For purposes of clarification, this section will apply to each Project individually. 
 2.6 Materials.
Ventyx may provide to BaySide certain materials necessary for performance of a Project as specified in the applicable Work Order, which may include, without limitation, Ventyx Product (collectively, “Materials”), in
amounts sufficient for the conduct of the Project. All such Materials will remain the sole property of Ventyx, will be used only in furtherance of the Services in accordance with this Agreement and each Work Order, will not be used or delivered to
or for the benefit of any third party without the prior written consent of Ventyx, and will be used in compliance with all applicable laws, rules and regulations. The Materials supplied by Ventyx under this Agreement must be used with prudence and
appropriate caution in any experimental work because not all of their characteristics may be known. Except as expressly set forth herein, THE MATERIALS ARE PROVIDED “AS IS” AND WITHOUT ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED,
INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR ANY PARTICULAR PURPOSE OR ANY WARRANTY THAT THE USE OF THE MATERIALS WILL NOT INFRINGE OR VIOLATE ANY PATENT OR OTHER PROPRIETARY RIGHTS OF ANY THIRD PARTY.

  

	3.	 PAYMENT 

As full consideration for Services, Ventyx will pay BaySide the amounts set forth in the applicable Work Order in accordance with the payment schedule set
forth in such Work Order. BaySide will provide to Ventyx for each Work Order one or more invoices (to be delivered at intervals agreed upon in such Work Order), summarizing the Services performed during such specific period of time under such Work
Order and the fees and costs therefor. BaySide will invoice Ventyx for all amounts due in United States Dollars. Ventyx will pay all undisputed amounts within thirty (30) days after receipt of a proper invoice and reasonable supporting
documentation for such invoice. BaySide will not exceed the budget set forth in any Work Order without the prior written consent of Ventyx. 
  

	4.	 REGULATORY 

4.1 Regulatory Inspections. If any governmental or regulatory authority conducts, or gives notice to BaySide of its intent to
conduct, an inspection at BaySide’s facilities where any Project or Services are being performed or to take any other regulatory action with respect to any Project or Services, BaySide will use best efforts to notify Ventyx prior to complying
with such a demand or request. 

  
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 4.2 Visits by Ventyx. Representatives of Ventyx may visit and/or meet with
BaySide or Ventyx-approved subcontractors at reasonable times and with reasonable frequency during normal business hours to observe the progress of each Project and review Project records. BaySide will assist Ventyx in scheduling such visits. 

4.3 Record-Keeping. BaySide will maintain records of documents, information, data and materials used or generated in performance
of the Services (including, without limitation, Work Product and Intellectual Property) in a professional manner so as to permit Ventyx to review such records in accordance with this Section 4.3 without disclosing to Ventyx any third party
confidential or proprietary information. Designated representatives of Ventyx will, upon reasonable notice to BaySide, have access to and will be permitted to review all such records. BaySide will provide to Ventyx upon request a copy of all such
records. Following expiration or termination of this Agreement, BaySide will (a) continue to make such records available to Ventyx for a period of five (5) years from the date of such termination, or (b) upon Ventyx’s prior
written request, transfer ownership of such records to Ventyx. After expiration of such retention period, BaySide will either transfer such records to Ventyx or destroy such records as determined by Ventyx in its sole discretion. This
Section 4.3 is subject to any provision of the applicable Work Order providing for BaySide to deliver any such records to Ventyx. 
  

	5.	 OWNERSHIP OF INTELLECTUAL PROPERTY 

BaySide understands and agrees that the underlying rights to the intellectual property and materials that are the subject of each Work Order, including,
without limitation, all intellectual property rights in Ventyx Products, are owned solely by Ventyx. Neither BaySide nor any Ventyx- approved subcontractor will acquire any rights of any kind whatsoever with respect to Ventyx Products as a result of
conducting a particular Project. All rights to Work Product generated in the performance of work conducted under this Agreement by BaySide’s employees, agents, consultants, subcontractors or other representatives, either solely or jointly with
employees, agents, consultants or other representatives of Ventyx, including all patent and other intellectual property rights therein (the “Intellectual Property”), will be owned solely by Ventyx. BaySide and all employees,
agents, consultants and subcontractors of BaySide will sign and deliver to Ventyx all writings and do all such things as may be necessary or appropriate to vest in Ventyx all right, title and interest in and to such Work Product and Intellectual
Property. BaySide will promptly disclose to Ventyx any such Work Product arising under this Agreement. Ventyx may, in its sole discretion, file and prosecute in its own name and at its own expense, patent applications on any patentable inventions
within the Work Product. Upon the request of Ventyx, and at the sole expense of Ventyx, BaySide will assist Ventyx in the preparation, filing and prosecution of such patent applications and will execute and deliver any and all instruments necessary
to effectuate the ownership of such patent applications and to enable Ventyx to file and prosecute such patent applications in any country. 
  

	6.	 CONFIDENTIALITY 

6.1 Confidentiality Obligation. During the term of this Agreement and for a period of five (5) years thereafter, BaySide
will maintain all Confidential Information (as defined below) as confidential and will not disclose any Confidential Information or use any Confidential Information for any purpose, except (a) as expressly authorized by this Agreement,
(b) as 

  
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 permitted by Section 6.3, or (c) to its employees, agents, consultants, Ventyx-approved
subcontractors and other representatives who require access to such information to accomplish the purposes of this Agreement so long as such persons are under obligations regarding the confidentiality of the Confidential Information and the
ownership of Work Product that are consistent with and no less protective to Ventyx than the terms of this Agreement. BaySide may use the Confidential Information only to the extent required to accomplish the purposes of this Agreement. BaySide will
use at least the same standard of care as it uses to protect its own confidential information to ensure that its employees, agents, consultants, Ventyx-approved subcontractors and other representatives do not disclose or make any unauthorized use of
the Confidential Information. BaySide will promptly notify Ventyx upon discovery of any unauthorized use or disclosure of the Confidential Information. 

6.2 Definition. For purpose of this Agreement, “Confidential Information” means all information provided
by or on behalf of Ventyx to BaySide in connection with any Project and all data, results, inventions and information developed in or as a result of the activities undertaken by BaySide in connection with each such Project (including, without
limitation, the Work Product, Results and Intellectual Property), whether in oral, written, graphic or electronic form. Notwithstanding the foregoing, Confidential Information will not include any information which BaySide can demonstrate by
competent evidence: (a) is now, or hereafter becomes, through no act or failure to act on the part of BaySide or any of its employees, agents, consultants or subcontractors, generally known or available; (b) is known by BaySide at the time
of receiving such information; or (c) is hereafter furnished to BaySide by a third party, as a matter of right and without restriction on disclosure. 

6.3 Authorized Disclosure. Notwithstanding Section 6.1, BaySide may disclose Confidential Information, without violating
its obligations under this Agreement, to the extent the disclosure is required by a valid order of a court or other governmental body having jurisdiction, provided that BaySide gives reasonable prior written notice to Ventyx of such required
disclosure and, at Ventyx’s request and expense, cooperates with Ventyx’s efforts to obtain a protective order preventing or limiting the disclosure and/or requiring that the Confidential Information so disclosed be used only for the
purposes for which the law or regulation requires, or for which the order was issued. 
 6.4 Third Party Confidential Information.
BaySide will not disclose to Ventyx any confidential or proprietary information that belongs to any third party during its performance under this Agreement. 
  

	7.	 REPRESENTATIONS AND WARRANTIES 

7.1 Mutual Representations and Warranties. Each party represents and warrants that (a) it has full power and authority to
enter into this Agreement, (b) this Agreement has been duly authorized, and (c) this Agreement is binding upon it. 
 7.2
BaySide Representations and Warranties. BaySide represents and warrants that: 
 (a) the terms of this Agreement are not inconsistent with its other
contractual arrangements; 

  
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 (b) BaySide is not constrained by any existing agreement in providing complete disclosures to Ventyx
concerning obligations to be performed under this Agreement; (c) BaySide will render the Services in accordance with high professional standards and in compliance with the terms of this Agreement, the terms of each Work Order, and all
applicable laws and regulations; and (d) the personnel assigned to perform Services rendered under this Agreement will be qualified and professionally capable of performing the Services. 

7.3 No Debarment. BaySide hereby certifies that it has not been debarred under the provisions of the Generic Drug Enforcement
Act of 1992, 21 U.S.C. §306. In the event that BaySide (a) becomes debarred, or (b) receives notice of action or threat of action with respect to its debarment, during the term of this Agreement, BaySide agrees to notify Ventyx
immediately. In the event that BaySide becomes debarred as set forth in clause (a) above or in the event that BaySide receives notice of action or threat of action as set forth in clause (b) above, Ventyx will have the right to terminate
this Agreement immediately. 
 7.4 No Services of Debarred Persons. BaySide hereby certifies that it has not and will not use
in any capacity the services of any individual, corporation, partnership, institution or association that has been debarred under 21 U.S.C. §30. In the event BaySide becomes aware of the debarment or threatened debarment of any individual,
corporation, partnership, institution or association providing services to BaySide which directly or indirectly relate to BaySide’s activities under this Agreement, BaySide will notify Ventyx immediately. Ventyx will have the right to terminate
this Agreement immediately upon receipt of such notice. 
 7.5 Disclaimer of Warranties. EXCEPT AS EXPRESSLY SET FORTH IN THIS
AGREEMENT, NEITHER PARTY MAKES ANY REPRESENTATION OR WARRANTY TO THE OTHER PARTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. 
 7.6 Limitation of Liability. EXCEPT FOR BREACH OF ARTICLE 6, IN NO EVENT WILL EITHER
PARTY BE LIABLE TO THE OTHER PARTY FOR ANY LOST PROFITS, LOST SAVINGS, OR ANY OTHER INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, CONSEQUENTIAL OR PUNITIVE DAMAGES, EVEN IF SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, ARISING OUT OF
OR IN CONNECTION WITH THIS AGREEMENT OR THE SERVICES PROVIDED HEREUNDER; PROVIDED, HOWEVER, THAT THIS SECTION 7.6 WILL NOT BE CONSTRUED TO LIMIT EITHER PARTY’S INDEMNIFICATION OBLIGATIONS UNDER ARTICLE 9. 

 

	8.	 TERM; TERMINATION 

8.1 Term. The term of this Agreement will commence on the Effective Date and will continue until termination of this Agreement as
provided in this Article 8. 
 8.2 Termination of Agreement At Will. Either party may terminate this Agreement at any time
upon 30 days’ prior written notice to the other party. Notwithstanding the foregoing, if Services under any Work Order are in progress on the date on which a party gives notice under this Section 8.2, then, at Ventyx’s option,
termination under this Section 8.2 will not be effective until the later of (a) 30 days after the date on which the other party receives such notice of termination, or (b) the date on which the Services to be provided under such Work Order
have been completed. 

  
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 8.3 Termination of Agreement for Material Breach. A party may terminate this
Agreement or any Work Order for material breach of this Agreement by the other party upon 30 days’ written notice specifying the nature of the breach, if such breach has not been cured within such 30-day
period. If such notice of breach is for breach of any Work Order, such notice will note the specific Work Order under which such breach is claimed. 

8.4 Payment upon Early Termination. In the event of termination prior to completion of the Services specified in any Work Order,
BaySide will be paid for all work completed through the date of termination in accordance with this Agreement and such Work Order, including reasonable and documented
out-of-pocket expenses and any non-cancellable commitments incurred by BaySide in accordance with this Agreement and such Work
Order. BaySide will refund to Ventyx any prepaid amounts not earned by BaySide prior to the date of such termination. 
 8.5
Survival upon Termination. Expiration or termination of this Agreement will not relieve the parties of any obligation accruing prior to such expiration or termination. Sections 2.5, 2.6, 4.1, 4.3, 7.5, 7.6, 8.4 and 8.5 and Articles 1, 5, 6, 9
and 10 will survive expiration or termination of this Agreement. 
  

	9.	 INDEMNIFICATION; LIABILITY; INSURANCE

 9.1 Indemnification by BaySide. BaySide agrees to defend, indemnify and hold harmless Ventyx and its
officers, directors, employees, consultants and agents from and against any and all losses, damages, liabilities, expenses and costs, including reasonable legal expense and attorneys’ fees (“Losses”), to which they may
become subject as a result of any claim, demand, action or other proceeding by any Third Party to the extent such Losses arise from or relate to (a) performance of the Services, (b) BaySide’s material breach of this Agreement,
(c) a breach of any of BaySide’s representations and warranties or covenants under Section 7, or (d) BaySide’s gross negligence or willful misconduct in performing its obligations under this Agreement, except to the extent
such Losses arise from Ventyx’s gross negligence, willful misconduct or material breach of this Agreement. 
 9.2
Indemnification by Ventyx. Ventyx agrees to defend, indemnify and hold harmless BaySide and its officers, directors, employees, consultants and agents from and against any and all Losses, to which they may become subject as a result of any
claim, demand, action or other proceeding by any Third Party to the extent such Losses arise from or relate to (a) Ventyx’s use of the Work Product hereunder, (b) Ventyx’s material breach of this Agreement, or
(c) Ventyx’s gross negligence or willful misconduct in performing its obligations under this Agreement, except to the extent such Losses arise from BaySide’s gross negligence, willful misconduct or material breach of this Agreement.

 9.3 General Conditions of Indemnification. In the event either party seeks indemnification under Section 9, it
(a) will provide written notice to the other party of any claim, demand or action arising out of the indemnified activities within thirty (30) days after it has knowledge of such claim, demand or action, (b) will permit the other
party to assume full responsibility and authority to investigate, prepare for and defend against any such claim or 

  
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demand (including the right to settle the claim solely for monetary consideration), (c) will assist the other party, at the other party’s reasonable expense, in the investigation of,
preparation for and defense of any such claim or demand, and (d) will not compromise or settle such claim or demand without the other party’s written consent. 

9.4 Liability of BaySide; Insurance. BaySide assumes any and all risks of personal injury and property damage attributable to
the negligent acts or omissions of BaySide and the officers, employees and agents thereof. BaySide warrants and represents that it is self-funded for liability insurance, both personal and property, with such protection being applicable to
BaySide’s officers, employees, servants and agents while acting within the scope of their employment by BaySide. BaySide will secure and maintain in full force and effect throughout the performance of each Project, insurance coverage in amounts
appropriate to the conduct of BaySide’s business. BaySide also agrees that it will maintain adequate insurance to cover its obligations hereunder, as well as workers’ compensation insurance in the amount required by the laws of the
jurisdiction in which BaySide’s employees are located. 
  

	10.	 GENERAL PROVISIONS 

10.1 Governing Law; Governing Language. This Agreement will be governed by the laws of the State of California, USA, without
regard to the conflicts of law provisions of any jurisdiction. The United Nations Convention on Contracts for the International Sale of Goods will not apply to this Agreement. The official text of this Agreement and any exhibits attached hereto, or
any notices given or accounts, reports or statements required hereby, shall be in English. In the event of any dispute concerning the construction or interpretation of this Agreement, reference shall be made only to this Agreement as written in
English and not to any other translation into any other language. 
 10.2 No Implied Licenses. Neither party grants any right
or license to the other party under this Agreement, except as specifically set forth herein. 
 10.3 Independent Contractor
Relationship. BaySide’s relationship with Ventyx will be that of an independent contractor and nothing in this Agreement will be construed to create a partnership, joint venture or employer-employee relationship. BaySide is not an agent of
Ventyx and is not authorized to make any representation, contract or commitment on behalf of Ventyx. BaySide will be solely responsible for all tax returns and payments required to be filed with or made to any federal, state or local tax authority
with respect to BaySide’s performance of Services and receipt of fees under this Agreement. 
 10.4 Use of Names. Neither
party will use the other party’s name or the names of the other party’s employees in any advertising or sales promotional material or in any publication without prior written permission of the other party. 

10.5 Entire Agreement; Amendment. This Agreement, together with all Exhibits attached hereto, constitutes the final, complete
and exclusive agreement of the parties with respect to the subject matter hereof and supersedes all prior understandings and agreements relating to its subject matter. This Agreement may not be changed, modified, amended or supplemented, except by a
written instrument signed by both parties. 

  
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 10.6 Severability. If any provision of this Agreement should be held invalid
or unenforceable, the remaining provisions will be unaffected and will remain in full force and effect, to the extent consistent with the intent of the parties as evidenced by this Agreement as a whole. 

10.7 Assignment; Delegation. This Agreement will inure to the benefit of and be binding upon the successors and assigns of the
parties. Neither party may assign any of its rights or obligations under this Agreement to any third party without the prior written consent of the other party; provided, however, that Ventyx may assign its interest in this Agreement to an
affiliate or in connection with a merger or sale of substantially all of its business or that portion of its business pertaining to the subject matter of this Agreement, whether by merger, sale of stock, sale of assets or otherwise. BaySide may not
subcontract or otherwise delegate its obligations under this Agreement without Ventyx’s prior written consent. 
 10.8
Headings. Section headings are for convenience of reference only and will not be considered in the interpretation of this Agreement. 

10.9 Force Majeure. Each party will be excused from liability for the failure or delay in performance of any obligation under
this Agreement by reason of any event beyond such party’s reasonable control, including, but not limited to, Acts of God, fire, flood, explosion, earthquake, or other natural forces, war, civil unrest, acts of terrorism, accident, destruction
or other casualty, any lack or failure of transportation facilities, any lack or failure of supply of raw materials, any strike or labor disturbance, or any other event similar to those enumerated above. Such excuse from liability will be effective
only to the extent and duration of the event causing the failure or delay in performance and provided that the party has not caused such event to occur. Notice of a party’s failure or delay in performance due to force majeure will be given to
the other party within ten (10) days after its occurrence. All delivery dates under this Agreement that have been affected by force majeure will be tolled for the duration of such force majeure. In no event will any party be required to prevent
or settle any labor disturbance or dispute. 
 10.10 Notices. Any notice required or permitted by this Agreement will be in
writing and will be given to the appropriate party at the address specified below or at such other address as the party may specify in writing. 
  

			
	 If to Ventyx:
	  	Ventyx Biosciences, Inc.
		  	 662 Encinitas Blvd, Suite 250

		  	 Encinitas, CA 92024

USA

		  	 Attn: Christopher W. Krueger

		  	 Email: ckrueger@ventyxbio.com

		
	 If to BaySide:
	  	 BaySide Pharma, LLC

		  	 2600 Hilltop Drive, B-C219

		  	 Richmond, CA 94806

USA

		  	 Attn.: Shendong Yuan

		  	 Email: syuan@baysidepharma.com

 All notices will be deemed given by (i) personal delivery when delivered personally; (ii) overnight
courier upon written verification of receipt; (iii) electronic mail upon acknowledgement of receipt; or (iv) certified or registered mail, return receipt requested, upon verification of receipt. 

  
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 10.11 Waiver. No waiver of a breach of any provision of this Agreement will be
valid, unless such waiver is in writing and signed by both parties. The waiver by either party of a breach of any provision of this Agreement by the other party will not be construed as a waiver of any other breach or subsequent breach by such
party. 
 10.12 Counterparts. This Agreement may be executed in two or more counterparts, each of which will be deemed an
original, but all of which will together constitute one and the same agreement. Delivery of an executed counterpart of a signature page to this Agreement by email of a scanned pdf copy will be effective as delivery of an original executed
counterpart of this Agreement. 

  
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 IN WITNESS WHEREOF, the
parties hereto have duly executed this Master Services Agreement on the Effective Date. 
  

									
	 VENTYX BIOSCIENCES, INC.
	 		 	 BAYSIDE PHARMA, LLC

					
	By:	 	 /s/ Christopher W. Krueger
	 		 	 By:
	 	 /s/ Shendong
Yuan                                         
   1/17/19

	Name: Christopher W. Krueger	 		 	 Name: Shendong Yuan

	 Title:   Chief Business Officer
	 		 	 Title:   Founder and President

 SIGNATURE PAGE to MASTER SERVICES
AGREEMENT 

 EXHIBIT A 

WORK ORDERSEX-10.13

 Exhibit 10.13 

VENTYX BIOSCIENCES, INC. 
 662
Encinitas Blvd., Ste. 250 
 Encinitas, CA 92024 

October 7, 2021 
 Jörn Drappa, M.D., Ph.D. 

c/o Ventyx Biosciences, Inc. 
 Re: Confirmatory Employment
Letter 
 Dear Jörn: 
 This
confirmatory employment letter agreement (the “Agreement”) is entered into between you and Ventyx Biosciences, Inc. (the “Company” or “we”), to confirm the current terms and conditions of your
employment with the Company. 
 1. Title; Position. You will continue to serve as the Company’s Chief Medical Officer. You also
will continue to report to the Company’s Chief Executive Officer and will perform the duties and responsibilities customary for such position and such other related duties as are reasonably assigned by the Company’s Chief Executive
Officer. While you render services to the Company, you will not engage in any other employment, consulting or other business activity (whether full time or part-time) that would create a conflict of interest with the Company, except as approved by
the Company’s Board of Directors (the “Board”) or its authorized committee. 
 2. Location. You will perform
your duties from the Company’s corporate offices located in Encinitas, California (with the exception of the period during which any shelter-in-place order,
quarantine order, or similar work-from-home requirement affecting your ability to work at the Company’s corporate offices remains in effect), subject to customary travel as reasonably required by the Company and necessary to perform your job
duties. 
 3. Base Salary. Your annual base salary is currently $430,000. Upon the IPO Effective Date (as defined below) your annual
base salary will be $440,000 (“Salary”), which will be payable, less any applicable withholdings, in accordance with the Company’s normal payroll practices. Your Salary will be subject to review and adjustment from time to time
by our Board or its Compensation Committee (the “Committee”), as applicable, in its sole discretion. “IPO Effective Date” means the effective date of the Company’s S-1
registration statement filed with the U.S. Securities and Exchange Commission relating to the Company’s initial public offering. 
 4.
Annual Bonus. Your current target fiscal year annual cash bonus target is 40% of your annual base salary. Upon the IPO Effective Date, your annual cash bonus target will be 40% of your annual base salary earned during the fiscal year (the
“New Bonus Opportunity”), based on achieving performance objectives established by the Board or the Committee, as applicable, in its sole discretion and payable upon achievement of those objectives as determined by the Committee.
For the avoidance of doubt, your New Bonus Opportunity shall apply to the fiscal year in which the IPO Effective Date occurs. Unless determined otherwise by the Board or Committee, as applicable, (i) any such bonus will be subject to your
continued employment through and until the date of payment and (ii) if your employment commenced in the second half of our fiscal year, any bonus for the fiscal year in which you commence employment with the Company will be prorated based on
the period during such fiscal year that you are employed with the Company. Any such bonus amounts paid will be subject to any applicable withholdings. Your annual bonus opportunity and the applicable terms and conditions may be adjusted from time to
time by our Board or the Committee, as applicable, in its sole discretion. 

 5. Equity Awards. You will be eligible to receive awards of stock options or other
equity awards pursuant to any plans or arrangements the Company may have in effect from time to time. The Board or Committee, as applicable, will determine in its sole discretion whether you will be granted any such equity awards and the terms of
any such award in accordance with the terms of any applicable plan or arrangement that may be in effect from time to time. 
 6. Employee
Benefits. You will continue to be eligible to participate in the benefit plans and programs established by the Company for its employees from time to time, subject to their applicable terms and conditions, including without limitation any
eligibility requirements. The Company will reimburse you for reasonable travel or other expenses incurred by you in the furtherance of or in connection with the performance of your duties under this Agreement, pursuant to the terms of the
Company’s expense reimbursement policy as may be in effect from time to time. The Company reserves the right to modify, amend, suspend or terminate the benefit plans, programs, and arrangements it offers to its employees at any time. 

7. Severance. You will be eligible for the Company’s Executive Change in Control and Severance Plan (the “Severance
Plan”) based on your position within the Company. Your Participation Agreement under the Severance Plan will specify the severance payments and benefits you could be eligible to receive in connection with certain terminations of your
employment with the Company. These protections will supersede all other severance payments and benefits you would otherwise currently be eligible for to, or would become eligible for in the future, under any plan, program or policy that the Company
may have in effect from time to time. 
 8. Confidentiality Agreement. As an employee of the Company, you will continue to have
access to certain confidential information of the Company and you may, during the course of your employment, develop certain information or inventions that will be the property of the Company. To protect the interests of the Company, your acceptance
of this Agreement confirms that the terms of the Company’s At-Will Employment, Confidential Information, Invention Assignment and Arbitration Agreement dated September 16, 2021 entered into between
you and the Company (the “Confidentiality Agreement”) still apply. 
 9. At-Will
Employment. This Agreement does not imply any right to your continued employment for any period with the Company or any parent, subsidiary, or affiliate of the Company. Your employment with the Company is and will continue to be at-will, as defined under applicable law. This Agreement and any provisions under it will not interfere with or limit in any way your or the Company’s right to terminate your employment relationship with the
Company at any time, with or without cause, to the extent permitted by applicable laws. 

  
 -2- 

 10. Protected Activity Not Prohibited. The Company and you acknowledge and agree that
nothing in this Agreement limits or prohibits you from filing and/or pursuing a charge or complaint with, or otherwise communicating or cooperating with or participating in any investigation or proceeding that may be conducted by, any federal, state
or local government agency or commission, including the Securities and Exchange Commission, the Equal Employment Opportunity Commission, the Occupational Safety and Health Administration, and the National Labor Relations Board (“Government
Agencies”), including disclosing documents or other information as permitted by law, without giving notice to, or receiving authorization from, the Company. In addition, nothing in this Agreement is intended to limit employees’ rights
to discuss the terms, wages, and working conditions of their employment, nor to deny employees the right to disclose information pertaining to sexual harassment or any unlawful or potentially unlawful conduct, as protected by applicable law. You
further understand that you are not permitted to disclose the Company’s attorney-client privileged communications or attorney work product. In addition, you acknowledge that the Company has provided you with notice in compliance with the Defend
Trade Secrets Act of 2016 regarding immunity from liability for limited disclosures of trade secrets. The full text of the notice is attached in Appendix A. 

11. Miscellaneous. This Agreement, together with the Confidentiality Agreement, the Severance Plan and the equity awards granted to you
by the Company under its 2019 Equity Incentive Plan or its 2021 Equity Incentive Plan, including the applicable award agreements thereunder, constitute the entire agreement between you and the Company regarding the material terms and conditions
of your employment, and they supersede and replace all prior negotiations, representations or agreements between you and the Company. This Agreement will be governed by the laws of the State of California but without regard to the conflict of law
provision. This Agreement may be modified only by a written agreement signed by a duly authorized officer of the Company (other than yourself) and you. 

[Signature page follows] 

  
 -3- 

 To confirm the current terms and conditions of your employment, please sign and date in the spaces indicated
and return this Agreement to the undersigned. 
  

			
	Sincerely,
	
	VENTYX BIOSCIENCES, INC.
		
	By:	 	/s/ Raju Mohan
		 	Name: Raju Mohan, Ph.D.
		 	Title: Chief Executive Officer
		
	Date:	 	October 7, 2021

  

			
		 	 Agreed to and accepted:

		
		 	/s/ Jorn Drappa
		 	Jörn Drappa, M.D., Ph.D.
		
		 	Date: October 7,
2021                                         
   

  
 -4- 

 Appendix A 

Section 7 of the Defend Trade Secrets Act of 2016 

“ . . . An individual shall not be held criminally or civilly liable under any Federal or State trade secret law for the disclosure of a trade secret
that—(A) is made—(i) in confidence to a Federal, State, or local government official, either directly or indirectly, or to an attorney; and (ii) solely for the purpose of reporting or investigating a suspected violation of law; or
(B) is made in a complaint or other document filed in a lawsuit or other proceeding, if such filing is made under seal. . . . An individual who files a lawsuit for retaliation by an employer for reporting a suspected violation of law may
disclose the trade secret to the attorney of the individual and use the trade secret information in the court proceeding, if the individual—(A) files any document containing the trade secret under seal; and (B) does not disclose the trade
secret, except pursuant to court order.” 

  
 -5-

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