Document:

EX-10.4

 Exhibit 10.4 

ADVISORY AGREEMENT 

In consideration and as a condition of my advisory relationship with Solid Ventures, LLC, a Delaware limited liability company (the
“Company”), I hereby agree with the Company as follows: 
 1. Relationship. During the period of my advisory relationship
with the Company, I shall devote my reasonable time and efforts to the Company’s business, consistent with my other business responsibilities. My efforts on behalf of the Company shall, accordingly, be on a part-time basis. My title with the
Company shall be Chairman of the Board of Managers (“Board Chairman”). My duties as Board Chairman shall consist of the following: (1) all customary duties befitting such position, including the organization and direction of meetings
of the Board of Managers of the Company and the appointment of members of such Board to various committees thereof, (ii) to act as Chairman of the Scientific Board of the Company and to perform all customary duties befitting such position,
including recruiting and directing scientific and technical personnel, heading the clinical and strategic direction of the Company, evaluating pre-clinical and clinical programs, and recruiting additional
members for the Scientific Board; to participate in regularly scheduled management and scientific review meetings; and (iv) to head the strategic planning of pre-clinical and clinical programs. 

2. Compensation. During the period of my advisory relationship, the Company shall pay me the following amounts for the performance of my
services: $50,000 per calendar quarter on the last day of each calendar quarter of 2015. 
 3.
Work-Made-for Hire. 
 (a) All right, title and interest in any and all writings, ideas,
inventions, know-how, designs, improvements or other property created during my employment relating in any way to the assets, business or operations of the Company, constituting copyrights, patents,
trademarks, service marks and related rights or other forms of proprietary rights or information (regardless of whether any such copyrights, patents, trademarks and service marks or other rights have or may be registered) that are created, adapted
or improved by me (whether alone or in conjunction with any other person or employee) or which I disclose to the Company, or which are based upon material facts, ideas or other property gathered from, for or about any personnel, contractors or
clients of the Company, and all material, whether created during or after my employment, that includes any of the foregoing (collectively, “Covered Material”), shall be owned by the Company and to the extent that it includes copyrightable
subject matter, shall be deemed a work made for hire for the Company within the meaning of the United States Copyright Act of 1976 and for all other purposes. If any Covered Material is deemed not to be work made for hire, such Covered Material is
hereby assigned by me to the Company and I shall not have or claim to have, under this Agreement or otherwise, any right, title or interest of any kind or nature whatsoever in such Covered Material. 

(b) The Company shall have the right to apply for and obtain registrations in the United States Copyright Office and the United States Patent
and Trademark Office, in its own or its designee’s name, of its rights in any or all of the Covered Material. If for any reason the rights in any Covered Material are registered, or applied to be registered, in my name, I shall assign in
writing such application or registration to the Company and hereby authorize and appoint the Company its agent for the purpose of recording such assignment. 

 (c) Whenever the Company shall so request, whether during or after my employment, I shall
execute, acknowledge and deliver all applications, assignments or other instruments; make or cause to be made all rightful oaths; testify in all legal proceedings; communicate all known facts which relate to such works, copyrights, inventions,
ideas, discoveries, designs and improvements; perform all lawful acts and otherwise render all such assistance as the Company may deem necessary to protect the Company’s interest therein including any assistance which the Company shall deem
necessary in connection with any proceeding or litigation involving the same. The Company shall reimburse me for all reasonable out-of-pocket costs, incurred by me in
rendering any such assistance requested by the Company pursuant to this Section. 
 4. Nondisclosure. I shall not at any time, whether
during or after the termination of my advisory relationship, regardless of the reason for such termination, reveal to any person or entity any Confidential Information except to employees of the Company who need to know such Confidential Information
for the purposes of their employment, or as otherwise authorized by the Company in writing. The term “Confidential Information” shall include, without limitation, any information and derivative information, in whatever form or medium,
including oral information, concerning the organization, business, finances or personnel of the Company or of any third party which the Company is under an obligation to keep confidential or that is maintained by the Company as confidential. Such
Confidential Information includes, but is not limited to, research and development activities performed by or on behalf of the Company, financial information about the Company or of any third party, personnel information, information regarding the
business activities or personnel actions of the Company, and any confidential information or documents of third parties, including, but not limited to, business plans, projects, and proposals. Notwithstanding the foregoing, Confidential Information
does not include information that: (a) is, at the time of determination, publicly known and generally available in the public domain other than in consequence of improper action by any person; or (b) was acquired by me free and clear of any
duty of confidentiality or restricted use and without improper action by the transferor of such information or any other person. I shall keep confidential all matters entrusted to me and shall not use or attempt to use any Confidential Information
except as may be required in the ordinary course of performing my duties as an advisor to the Company, and I shall not use any Confidential Information in any manner that may injure or cause loss or may be calculated to injure or cause loss to the
Company, whether directly or indirectly. 
 5. Non-hire of Employees and Consultants. During
my advisory relationship and the one year period following the termination thereof, regardless of the reason for such termination, I will not (except on the Company’s behalf), directly or indirectly, alone or as a consultant, partner, officer,
director, employee, joint venturer, lender or stockholder of any entity, employ, hire, retain, attempt to employ, hire or retain, or knowingly permit any company or business organization by which I am employed or which is directly or indirectly
controlled by me to employ, hire or retain, any Company employee or consultant, or any such person whose employment or consultancy with the Company has terminated within six months prior to or after my departure from the Company. 

  
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 6. Nonsolicitation of Employees and Consultants. During my advisory relationship and the
one year period following the termination thereof, regardless of the reason for such termination, I will not (except on the Company’s behalf), directly or indirectly, alone or as a consultant, partner, officer, director, employee, joint
venturer, lender or stockholder of any entity, in any manner seek to solicit or induce any Company employee or consultant, or any such person whose employment or consultancy with the Company has terminated within six months prior to or after my
departure from the Company, to leave his or her employment or consultancy with the Company, or assist in the recruitment or hiring of any such person. 

7. Noncompetition. During my advisory relationship and the one year period following the termination thereof, regardless of the reason
for such termination, I will not engage in any business or enterprise which is in any way competitive or conflicting with the interests or business of the Company including, without limitation, (A) any business or activity currently conducted
by the Company, and (B) any business that the Company intends to conduct and of which I am aware. 
 8. Nondisparagement. I shall
not at any time, whether during or after the termination of my advisory relationship, regardless of the reason for such termination, make to any person or entity disparaging, critical or otherwise detrimental comments of a business or personal
nature relating to the Company or its personnel. 
 9. Company Property. I agree that during my advisory relationship I shall not
make, use or permit to be used any Company Property otherwise than for the benefit of the Company. The term “Company Property” shall include all Confidential Information; the Company’s records, files and data; all Company computers,
cellular telephones, personal digital assistants, credit and/or calling cards, keys, access cards and the like; and all other documentation or materials of any nature and in any form, whether written, printed, electronic or in digital format or
otherwise, relating to any matter within the scope of the business of the Company or concerning any of its dealings or affairs and any other Company property in my possession, custody or control. I further agree that I shall not, after the
termination of my advisory relationship, regardless of the reason for such termination, use or permit others to use any such Company Property. I acknowledge and agree that all Company Property shall be and remain the sole and exclusive property of
the Company. Immediately upon the termination of my advisory relationship I shall deliver all Company Property in my possession, and all copies thereof, to the Company. 

10. Term of Advisory Relationship. The period of my advisory relationship shall be from the date of this Agreement through
December 31, 2015. Notwithstanding the foregoing, I may terminate my advisory relationship at any time, for any or no reason, on at least ten days’ prior notice, and the Company may terminate my advisory relationship for “Cause”
immediately upon notice. For purposes of this Agreement, a termination shall be for Cause if any one or more of the following has occurred: 

(i) I have committed an act of fraud, embezzlement, misappropriation or breach of fiduciary duty against the Company; 

(ii) I have been convicted of, or pleaded guilty or nolo contendere to, any crime triable upon indictment or involving moral
turpitude; 

  
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 (iii) I have engaged in the unlawful use (including being under the influence) or
possession of illegal drugs on the Company’s premises; or 
 (iv) I have breached any material provision of this
Agreement and such breach has continued for at least ten days after I have received written notice thereof from the Company. 
 11.
Waiver; Amendments. Any waiver by the Company of a breach of any provision of this Agreement shall not operate or be construed as a waiver of any subsequent breach of such provision or any other provision hereof. In addition, any amendment to
or modification of this Agreement or any waiver of any provision hereof must be in writing. 
 12. Severability. I agree that each
provision and the subparts of each provision herein shall be treated as separate and independent clauses, and the unenforceability of any one clause shall in no way impair the enforceability of any of the other clauses of the Agreement. Moreover, if
one or more of the provisions contained in this Agreement shall for any reason be held to be excessively broad as to scope, activity, subject or otherwise so as to be unenforceable at law, such provision or provisions shall be construed by the
appropriate judicial body by limiting or reducing it or them, so as to be enforceable to the maximum extent compatible with the applicable law as it shall then appear. I hereby further agree that the language of all parts of this Agreement shall in
all cases be construed as a whole according to its fair meaning and not strictly for or against either of the parties. 
 13.
Survival. This Agreement shall be effective as of the date entered below. My obligations under this Agreement shall survive the termination of my advisory relationship regardless of the reason for or manner of such termination and shall be
binding upon my heirs, executors, administrators and legal representatives. 
 14. Assignment. The Company shall have the right to
assign this Agreement to its successors and assigns, and all covenants and agreements hereunder shall inure to the benefit of and be enforceable by said successors or assigns. I may not assign this Agreement. 

15. Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware and shall in
all respects be interpreted, enforced and governed under the internal and domestic laws of Delaware, without giving effect to the principles of conflicts of laws of such state. The laws of the State of Delaware shall govern any claims or legal
actions by one party against the other arising out of the relationship between the parties contemplated herein (whether or not arising under this Agreement). 

16. Entire Agreement. This Agreement sets forth the complete, sole and entire agreement between the parties with respect to the subject
matter herein and supersedes any and all other agreements, negotiations, discussions, proposals, or understandings, whether oral or written, previously entered into, discussed or considered by the parties. 

  
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 IN WITNESS HEREOF, I have executed this Agreement as of the date first written below. 

 

			
	Signature:	 	 /s/ Andrey Zarur

		 	Andrey Zarur
	
	Date: December 18, 2013
		
	Address:	 	
		 	

  
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	Accepted and agreed to as of the date set forth above:
	
	Solid Ventures, LLC
		
	By:	 	 /s/ ILAN GANOT

	
	Signature: Ilan Ganot
	
	Title: CEO

  
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 Exhibit 10.5 

SOLID BIOSCIENCES, LLC 

AMENDED AND RESTATED EQUITY INCENTIVE PLAN 

(Effective as of March 29, 2017) 

1. ESTABLISHMENT AND TERM OF PLAN. 

1.1 Establishment. The Solid Ventures, LLC Equity Incentive Plan (the “Original
Plan”) was established effective as of January 1, 2014. The Original Plan is hereby amended and restated in its entirety effective as of March 29, 2017. The Original Plan, as so amended and restated, shall be known as
the “Solid Biosciences, LLC Amended and Restated Equity Incentive Plan” (the “Plan”). 
 1.2 Term of
Plan. The Plan shall continue in effect until the earlier of its termination by the Board or the date on which all of the Units available for issuance under the Plan have been issued and all forfeiture restrictions on such
Units under the terms of the Plan and the Unit Restriction Agreements have lapsed. 
 2. DEFINITIONS AND CONSTRUCTION.

 2.1 Definitions. Whenever used herein, the following terms shall have their respective meanings set forth below: 

(a) “Board” means the Board of Managers of the Company. 

(b) “Company” means Solid Biosciences, LLC, a Delaware limited liability company, or any successor
thereto. 
 (c) “Grant” means a grant of Units under the Plan. 

(d) “Grantee” means a person who has been granted Units under the Plan. 

(e) “Unit Restriction Agreement” means a written agreement between the Company and a Grantee setting
forth the terms, conditions and restrictions of the Units granted to the Grantee. 
 (f) “Units” means
the Series D Common Units of the Company. 
 2.2 Construction. Captions and titles contained herein are for convenience only and
shall not affect the meaning or interpretation of any provision of the Plan. Except when otherwise indicated by the context, the singular shall include the plural and the plural shall include the singular. Use of the term “or” is
not intended to be exclusive, unless the context clearly requires otherwise. 
 3. ADMINISTRATION. 

3.1 Administration by the Board. The Plan shall be administered by the Board. All questions of interpretation of
the Plan or of any Grant shall be determined by the Board, and such determinations shall be final and binding upon all persons having an interest in the Plan or such Grant. 

 3.2 Powers of the Board. In addition to any other powers
set forth in the Plan and subject to the provisions of the Plan, the Board shall have the full and final power and authority, in its discretion: 

(a) to determine the persons to whom, and the time or times at which, Grants shall be made and the number of Units to be subject to each
Grant; 
 (b) to determine the terms, conditions and restrictions applicable to each Grant (which need not be identical) and any Units
acquired pursuant thereto, including, without limitation, (i) the vesting of any Units (ii) the effect of the Grantee’s termination of service with the Company, and (iii) all other terms, conditions and restrictions applicable to
the Grant not inconsistent with the terms of the Plan; 
 (c) to approve one or more forms of Unit Restriction Agreement; and 

(d) to correct any defect, supply any omission or reconcile any inconsistency in the Plan or any Unit Restriction Agreement and to make all
other determinations and take such other actions with respect to the Plan or any Grant as the Board may deem advisable to the extent consistent with the Plan and applicable law. 

4. UNITS SUBJECT TO PLAN. 

The maximum aggregate number of Units that may be issued under the Plan shall be 2,971,949. If Units are acquired under the Plan subject to
forfeiture and are forfeited back to the Company, the forfeited Units shall again be available for issuance under the Plan. For the avoidance of doubt, the maximum aggregate number of Units issuable under the Plan includes Units granted under the
Original Plan which are outstanding as of March 29, 2017, and Units which are subject to contingent grants as of that date, including Units issued to former Class C members of Solid GT, LLC upon the merger of that entity into the Company. 

5. ELIGIBILITY LIMITATIONS. 

Grants may only be made to employees, consultants and other service providers to the Company. 

6. TERMS AND CONDITIONS OF GRANTS. 

Grants shall be evidenced by Unit Restriction Agreements specifying the number of Units covered thereby. No Grant shall be a valid and binding
obligation of the Company unless evidenced by a fully-executed Unit Restriction Agreement. Unit Restriction Agreements may incorporate all or any of the terms of the Plan by reference and Units issued under
the Plan may be subject to forfeiture as determined by the Board in its discretion at the time the Grant is made. 
 7. COMPLIANCE
WITH SECURITIES LAW. 
 Each Grant and the issuance of Units shall be subject to compliance with all applicable requirements of
federal, state and foreign law with respect to such securities. 
 8. TERMINATION OR AMENDMENT OF PLAN. 

The Board may terminate or amend the Plan at any time, subject to such approvals by the members of the Company as may be required. 

  
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 9. GOVERNING LAW. 

The validity, construction and effect of the Plan and of any rules, regulations, determinations or decisions made by the Board relating to the
Plan and the rights of any and all persons having or claiming to have any interest therein or thereunder, shall be determined exclusively in accordance with applicable federal laws and the laws of the State of Delaware, without regard to its
conflict of laws principles. 

  
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