Document:

EX-10.18

 Exhibit 10.18 

CONFIDENTIAL TREATMENT REQUESTED 

LICENSE AGREEMENT 
 This LICENSE AGREEMENT
(“Agreement”) is entered into as of October 30, 2013 (“Effective Date”) by and between ReGenX Biosciences, LLC, a limited liability company organized under the laws of the State of Delaware, with offices at 750
17th Street, NW, Suite 1100, Washington, DC 20006 (“Licensor”), and Dimension Therapeutics, Inc., a corporation organized under the laws of the State of Delaware, with offices at
1 Main Street, 13th Floor, Cambridge, MA 02142 (“Licensee”). Licensor and Licensee are hereinafter referred to individually as a “Party” and collectively as the
“Parties.” 
 WHEREAS, Licensor has exclusive rights under certain patents pertaining to various recombinant adeno-associated virus
vectors; and 
 WHEREAS, Licensee desires to obtain an exclusive license under the Licensed Technology under the terms set forth herein; 

NOW, THEREFORE, in consideration of the promises and covenants contained in this Agreement, and intending to be legally bound, the Parties hereby agree as
follows: 
 ARTICLE 1: DEFINITIONS 
 1.1
“Affiliate” means any legal entity directly or indirectly controlling, controlled by, or under common control with another entity. For purposes of this Agreement, “control” means the direct or indirect ownership of more
than 50% of the outstanding voting securities of a legal entity, or the right to receive more than 50% of the profits or earnings of a legal entity, or the right to control the policy decisions of a legal entity. 

1.2 “Calendar Quarter” means each three-month period or any portion thereof, beginning on
January 1, April 1, July 1, and October 1. 
 1.3 “Collaboration” means an arrangement between Licensee and a
Sublicensee under which research and development activities are performed on a shared basis for the purpose of the parties jointly developing and exploiting Licensed Products in the Field; provided that a Collaboration will not include an
arrangement whereby Licensee is compensated solely for performing research or development activities. 
 1.4 “Commercial License” means a
license agreement between Licensor and a Third Party pursuant to which Licensor grants a license to the Licensed Technology and which license agreement meets the following: (a) the agreement contains provisions substantially comparable to
Section 2.6 with respect to improvements of the Third Party that are substantially similar to “Licensed Back Improvements” as defined in this Agreement; (b) the Third Party grants to Licensor a sublicensable license to such
“Licensed Back Improvements” of the Third Party; and (c) Licensor is not required to pay any royalties, milestones, or other fees in connection with the exploitation of such sublicensable license. 

1.5 “Confidential Information” means and includes all technical information, inventions, developments, discoveries, software, Know-How,
methods, techniques, formulae, animate and inanimate materials, data, processes, finances, business operations or affairs, and other 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
proprietary ideas, whether or not patentable or copyrightable, of either Party that are (a) marked or otherwise identified as confidential or proprietary at the time of disclosure in
writing; or (b) if disclosed orally, visually, or in another non-written form, identified as confidential at the time of disclosure and summarized in reasonable detail in writing as to its general content within 30 days after original
disclosure. The Parties acknowledge that (i) the terms and conditions of this Agreement and (ii) the records and reports referred to in Section 3.5 will be deemed the Confidential Information of both Parties, regardless of whether
such information is marked or identified as confidential. In addition, information provided to Licensee pursuant to the provisions of Section 7.1 will be deemed the Confidential Information of Licensor, regardless of whether such information is
marked or identified as confidential. Notwithstanding the foregoing, Confidential Information will not include the following, in each case, to the extent evidenced by competent written proof of the Receiving Party: 

1.5.1 information that was already known to the Receiving Party, other than under an obligation of confidentiality, at the time of disclosure
by the Disclosing Party; 
 1.5.2 information that was generally available to the public or otherwise part of the public domain at the
time of its disclosure to the Receiving Party; 
 1.5.3 information that became generally available to the public or otherwise part of the
public domain after its disclosure, other than through any act or omission of the Receiving Party in breach of this Agreement; 
 1.5.4
information that is independently discovered or developed by the Receiving Party without the use of Confidential Information of the Disclosing Party; or 

1.5.5 information that was disclosed to the Receiving Party, other than under an obligation of confidentiality, by a Third Party who had no
obligation to the Disclosing Party not to disclose such information to others. 
 1.6 “Control” means the possession by Licensor (whether
by ownership or license, other than pursuant to this Agreement) of the ability to grant to Licensee access, a license, or a sublicense (as applicable) to the applicable patent, patent application, Know-How, or other intellectual property on the
terms and conditions set forth herein without violating the terms of any agreement or other arrangement with any Third Party. 
 1.7 “Disclosing
Party” has the meaning set forth in Section 5.1. 
 1.8 “Domain Antibody” ****. 

1.9 “Existing Licenses” means the GSK Agreement and Penn Agreement. 

1.10 “FDA” means the United States Food and Drug Administration, or a successor agency in the United States with responsibilities comparable
to those of the United States Food and Drug Administration. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

1.11 “Field” means each of the following: (a) the treatment of hemophilia A in human beings by in vivo gene therapy
administration; (b) the treatment of hemophilia B in human beings by in vivo gene therapy administration; and (c) the treatment of the specific disease indication(s) included within the “Field” pursuant to Section 2.4
in human beings by in vivo gene therapy administration. 
 1.12 “GSK Agreement” means that certain License Agreement entered into
between Licensor and SmithKline Beecham Corporation, effective on March 6, 2009, as amended by that certain Amendment to License Agreement dated April 15, 2009, and as amended from time to time. 

1.13 “Know-How” means any and all ideas, information, know-how, data, research results, writings, inventions, discoveries, and other
technology (including any proprietary materials), whether or not patentable or copyrightable. 
 1.14 “Licensed Know-How” means 

 

	 	(a)	any Know-How that, as of the Effective Date, (i) is Controlled by Licensor pursuant to the Existing Licenses or the Penn Sponsored Research Agreement or pursuant to Licensor’s ownership thereof and
(ii) is reasonably necessary for the use, sale, offer for sale, or import of Licensed Products in the Field, including that which is set forth on Exhibit B; and 

 

	 	(b)	if a specific disease indication is added to the Field pursuant to Section 2.4, any Know-How that, as (x) of the Effective Date or (y) if the added disease indication is one of the indications set forth
on Exhibit D, as of the date on which such disease indication is added, (i) is Controlled by Licensor pursuant to the Existing Licenses or the Penn Sponsored Research Agreement or pursuant to Licensor’s ownership thereof,
(ii) is directed to the specific disease indication that is added, and (iii) is reasonably necessary for the use, sale, offer for sale, or import of Licensed Products in the added specific disease indication in the Field;

 provided that “Licensed Know-How” will not include any Manufacturing Technology other than Triple-Transfection Know-How that
otherwise falls within clause (a) or (b) above; provided further that “Licensed Know-How” will not include any patents or patent applications. 

1.15 “Licensed Patents” means (a) all United States patents and patent applications listed in Exhibit A, as modified pursuant to
Section 2.7.1, including patents arising from such patent applications; (b) any additional claims of patents and patent applications as required pursuant to Section 8.1.7; and (c) any re-examination certificates thereof, and
their foreign counterparts and extensions, continuations, divisionals, and re-issue applications; provided that “Licensed Patents” will not include any claim of a patent or patent application covering any Manufacturing Technology. 

1.16 “Licensed Product” means (a) any product that is made, made for, used, sold, offered for sale, or imported by Licensee, its
Affiliates and any of its or their Sublicensees, the manufacture, use, sale, offer for sale, or import of which product, in the absence of the license granted pursuant to this Agreement, would infringe or is covered by at least one Valid Claim in
the 

  
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country of manufacture, use, sale, offer for sale, or import, including products manufactured by a process that would infringe or is covered by at least one Valid Claim in the country of
manufacture, use, sale, offer for sale, or import; or (b) any service with respect to the administration of any product to patients that, in the absence of the licenses granted pursuant to this Agreement, would infringe or is covered by at
least one Valid Claim in the country of sale. 
 1.17 “Licensed Technology” means, collectively, the Licensed Patents and Licensed
Know-How. 
 1.18 “Licensor Improvements” means any patent or patent application that meets all of the following criteria: 

 

	 	(a)	is directed to any of: the composition of recombinant adeno-associated virus vectors, methods of use of such vectors, or methods of developing such vectors, but, in each case, only to the extent of such claims;

  

	 	(b)	is reasonably necessary for any of: the use, sale, offer for sale, or import of Licensed Products in the Field; and 

  

	 	(c)	prior to the 18 month anniversary of (i) the Effective Date, with respect to the disease indications of the Field set forth in Section 1.11(a) or (b), or (ii) the date on which a disease indication is
added to the Field pursuant to Section 2.4, with respect to the disease indications of the Fields set forth in Section 1.11(c), is (x) is developed by Licensor or (y) becomes Controlled by Licensor pursuant to a Commercial
License; 

 provided that “Licensor Improvements” will not include any Manufacturing Technology. 

1.19 “Manufacturing Technology” means any and all patents, patent applications, Know-How, and all intellectual property rights associated
therewith, and including all tangible embodiments thereof, that are necessary or useful for the manufacture of adeno-associated viruses, adeno-associated virus vectors, research or commercial reagents related thereto, Licensed Products, or other
products, including manufacturing processes, technical information relating to the methods of manufacture, protocols, standard operating procedures, batch records, assays, formulations, quality control data, specifications, scale up, any and all
improvements, modifications, and changes thereto, and any and all activities associated with such manufacture. Any and all chemistry, manufacturing, and controls (CMC), drug master files (DMFs), or similar materials provided to regulatory
authorities and the information contained therein are deemed Manufacturing Technology. 
 1.20 “Muscular Dystrophy” ****. 

1.21 “NDA” means a New Drug Application filed with the FDA as described in 21 C.F.R. § 314, a Biological License Application (BLA)
pursuant to 21 C.F.R. § 601.2, or any equivalent or any corresponding application for regulatory approval in any country or regulatory jurisdiction other than the United States. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 1.22 “Net Sales” means the gross receipts from sales or other
disposition of a Licensed Product (including fees for services within the definition of “Licensed Product”) by Licensee and/or its Affiliates and/or any Sublicensees to Third Parties less the following deductions that are directly
attributable to a sale, specifically and separately identified on an invoice or other documentation and actually borne by Licensee, its Affiliates, or any Sublicensees: ****. In the event consideration other than cash is paid to Licensee, its
Affiliates, or any Sublicensees, for purposes of determining Net Sales, the Parties shall use the cash consideration that Licensee, its Affiliates, or any Sublicensees would realize from an unrelated buyer in an arm’s length sale of an
identical item sold in the same quantity and at the time and place of the transaction, as determined jointly by Licensor and Licensee based on transactions of a similar type and standard industry practice, if any. 

1.23 “Penn Agreement” means that certain License Agreement entered into between Licensor and The Trustees of the University of Pennsylvania,
effective on February 24, 2009, as amended by that letter agreement dated March 6, 2009, and as amended from time to time. 
 1.24 “Penn
Sponsored Research Agreement” means that certain Sponsored Research Agreement entered into between Licensor and The Trustees of the University of Pennsylvania, effective on February 24, 2009, as amended from time to time, including by
Amendment No. 1, effective February 24, 2010, Amendment No. 2, dated March 31, 2010, Amendment No. 3, dated December 31, 2010, Amendment No. 4, effective December 31, 2011, Amendment No. 5, effective
April 1, 2012, and Amendment No. 6, effective December 31, 2012. 
 1.25 “Prosecute” means preparation, filing, and
prosecuting patent applications and maintaining patents, including any reexaminations, reissues, oppositions, and interferences. 
 1.26 “Receiving
Party” has the meaning set forth in Section 5.1. 
 1.27 “Retained Rights” has the meaning set forth in Section 2.2.

 1.28 “Sublicensee” means any Third Party or Affiliate to whom Licensee grants a sublicense of some or all of the rights granted to
Licensee under this Agreement as permitted by this Agreement. 
 1.29 “Third Party” means any person or entity other than a Party to this
Agreement or Affiliates of a Party to this Agreement. 
 1.30 “Triple Transfection Know-How” means unpatented Know-How that, as of the
Effective Date, (a) is Controlled by Licensor pursuant to the Existing Licenses or the Penn Sponsored 

  
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REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

Research Agreement or pursuant to Licensor’s ownership thereof, (b) is directed to the triple-transfection method for making adeno-associated virus
vectors, and (c) is set forth on Exhibit B; provided that, notwithstanding the scope of the license grant in Section 2.1, any rights granted to Licensee under this Agreement with respect to the Triple Transfection Know-How will be
limited to use of such Know-How in the Field through Phase 2 clinical trials. 
 1.31 “Valid Claim” means a claim of an issued and
unexpired patent (including any patent claim the term of which is extended by any extension, supplementary protection certificate, patent term restoration, or the like) included within the Licensed Patents or a claim of a pending patent application
included within the Licensed Patents, which has not lapsed, been abandoned, been held revoked, or been deemed unenforceable or invalid by a non-appealable decision or an appealable decision from which no appeal was taken within the time allowed for
such appeal of a court or other governmental agency of competent jurisdiction. 
 ARTICLE 2: LICENSE GRANT 

2.1 License Grant. Subject to the terms and conditions of this Agreement, including the Retained Rights, Licensor hereby grants to Licensee an
exclusive, sublicensable (as provided in Section 2.5 only), non-transferable (except as provided in Section 10.2), royalty-bearing, worldwide license, under the Licensed Technology to make, have made, use, import, sell, and offer for sale
Licensed Products solely in the Field, including, for the avoidance of doubt, the right to conduct research and development, including conducting pre-clinical and clinical trials. 

2.2 Retained Rights. Except for the rights and licenses specified in Section 2.1, or as provided in Section 8.1.7, no license or other rights
are granted to Licensee under any intellectual property of Licensor, whether by implication, estoppel, or otherwise, whether any such intellectual property dominates or is dominated by the Licensed Technology. Notwithstanding anything to the
contrary in this Agreement, Licensor may use and permit others to use the Licensed Technology for any research, development, commercial, or other purposes, outside of the Field. Without limiting the foregoing, and notwithstanding anything in this
Agreement to the contrary, Licensee acknowledges and agrees to the following rights retained by Licensor and its direct and indirect licensors (individually and collectively, the “Retained Rights”), whether inside or outside the
Field: 
 2.2.1 The rights and licenses granted in Section 2.1 shall not include any right (and Licensor and its direct and indirect
licensors retain the exclusive (even as to Licensee), fully sublicensable right) under the Licensed Technology to make, have made, use, sell, offer to sell, and import Domain Antibodies that are expressed by an adeno-associated vector. 

2.2.2 Licensor and its direct and indirect licensors retain the following rights with respect to the Licensed Technology: 

 

	 	(a)	A non-exclusive, sublicensable right under the Licensed Technology to make, have made, use, sell, offer to sell, and import products that deliver RNA interference and antisense drugs using an adeno-associated vector;
and 

  
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	 	(b)	A non-exclusive right for Licensor’s direct and indirect licensors (which right is sublicensable by such licensors) to use the Licensed Technology for non-commercial research purposes and to use the Licensed
Technology for such licensors’ discovery research efforts with non-profit organizations and collaborators. 

 2.2.3 The
rights and licenses granted in Section 2.1 shall not include any right (and Licensor retains the exclusive (even as to Licensee), fully sublicensable right) under (a) the Licensed Technology that cover the rAAV serotype 8, to make, have
made, use, sell, offer for sale, and import products for the treatment of all forms of hemophilia B; or (b) the Licensed Technology that cover the rAAV serotype 9, to make, have made, use, sell, offer for sale, and import products for the
treatment of (i) all forms of Muscular Dystrophy; (ii) congestive heart failure suffered by Muscular Dystrophy patients; and (iii) any and all cardiovascular diseases by delivery of any or all of genes encoding I-lc and Serca2a and
creatine kinase. 
 2.2.4 Licensor and its direct and indirect licensors retain the following rights with respect to the Licensed
Technology: a non-exclusive, sublicensable right to make, have made, use, sell, offer for sale, and import all of the various serotypes of any adeno-associated vector that is the subject of at least one claim in the Licensed Patents solely for
non-commercial research in the areas of Muscular Dystrophy, hemophilia B, congestive heart failure suffered by Muscular Dystrophy patients, and other cardiovascular disease. 

2.2.5 Licensor retains the following rights with respect to the Licensed Technology: to the extent Licensed Technology pertains to recombinant
adeno-associated virus serotype 8, an exclusive, sublicensable right to make, have made, use, sell, offer for sale, and import products for the treatment of hemophilia A. 

2.2.6 The rights and licenses granted in Section 2.1 shall not include any right (and Licensor retains the exclusive (even as to
Licensee), fully sublicensable right) under the Licensed Technology: 
  

	 	(a)	to conduct commercial reagent and services businesses, which includes the right to make, have made, use, sell, offer to sell, and import research reagents, including any viral vector construct; provided that, for
clarity, such rights retained by Licensor shall not include the right to conduct clinical trials in humans in the Field; or 

  

	 	(b)	to use the Licensed Technology to provide services to any Third Parties; provided that, for clarity, Licensee’s license under Section 2.1 does include the right to administer Licensed Products to patients. For
clarity, activities conducted by Licensee for a Sublicensee as part of a Collaboration are not intended to be deemed services under this Section 2.2.6(b). 

2.2.7 Licensor retains the fully sublicensable right under the Licensed Technology to grant non-exclusive research and development licenses to
Affiliates and Third Parties; provided 

  
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that such development rights granted by Licensor shall not include the right to conduct clinical trials in humans in the Field or any rights to sell products in the Field. 

2.2.8 The University of Pennsylvania may use and permit other non-profit organizations or other non-commercial entities to use the Licensed
Technology solely for educational, research, and other non-commercial purposes. 
 2.2.9 The Parties acknowledge that the Retained Rights
included in Sections 2.2.3 and 2.2.4 are excluded from this Agreement because they were retained by the licensor under the GSK Agreement and that the Retained Rights included in Section 2.2.5 are excluded from this Agreement because of rights
granted by Licensor to other licensees or Third Parties. If Licensor is granted the rights described in Section 2.2.3 or 2.2.4 or regains the rights described in Section 2.2.5, Licensor will notify Licensee of such event, together with a
description of the rights granted or regained, in which case, the applicable Retained Rights granted or regained will no longer be considered Retained Rights, and the license granted to Licensee under Section 2.1 will no longer be subject to
such granted or regained rights. 
 2.3 Government Rights. Licensee acknowledges that the United States government retains certain rights in
intellectual property funded in whole or part under any contract, grant, or similar agreement with a federal agency. The license grant hereunder is expressly subject to all applicable United States government rights, including any applicable
requirement that products resulting from such intellectual property sold in the United States must be substantially manufactured in the United States absent, with respect to such manufacturing requirement, a waiver of such requirement obtained by
Licensee from the applicable governmental agency. 
 2.4 Additional Disease Indications. 

2.4.1 At any time prior to the ****of the Effective Date (the “Election Term”), Licensee may nominate in writing to Licensor
a specific disease indication for inclusion in the “Field” under this Agreement. Within **** of Licensor’s receipt of such notice, Licensor will inform Licensee in writing whether the nominated disease indication is available for
licensing based on whether it: (a) is a disease indication set forth on Exhibit D; provided that the indications so listed do not constitute a limitation on the indications Licensee may nominate; (b) is the subject of a conflicting
license with a Third Party (or the subject of a license being negotiated with a Third Party, as to which (i) there has been a written request for license terms from such Third Party, (ii) such Third Party or Licensor has submitted a
written proposal for terms for a license (which may be limited to financial terms), (iii) Licensor and such Third Party have entered into a confidentiality agreement for purposes of such Third Party conducting a due diligence review, and
(iv) a “writing” for purposes of the foregoing clauses includes e-mail correspondence); or (c) is part of an existing Licensor program (i.e., a program that is the subject of on-going advanced preclinical study
(e.g., there has been a pre-IND meeting) or is in clinical development or at a later stage of development or commercialization). If the nominated disease indication is subject to a conflicting Third Party license or subject to an existing
Licensor program, then the disease indication will be deemed rejected. Otherwise, the specific disease indication will be deemed available for licensing, and the Field will automatically be deemed to include the nominated specific disease indication
immediately upon Licensor’s delivery of a confirmatory written notice. For purposes of nominating a disease indication for inclusion in the 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

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“Field,” the indication must be a specific type of condition and not a general disease class, for instance “mucopolysaccharidosis (MPS) VI” and not “mucopolysaccharidosis
(MPS)” and “hemophilia A” not “hemophilia.” If Licensor determines that a disease indication nominated by Licensee pursuant to this Section 2.4 is not specific, Licensor will notify Licensee within ****of
Licensor’s receipt of the notice of nomination, and the Parties will negotiate in good faith as to the proposed scope and definition of the nominated disease indication. 

2.4.2 Licensee will be entitled to nominate a reasonable number of specific disease indications during the Election Term until two additional
specific disease indications are included in the Field. 
 2.4.3 During the Election Term, Licensor will not license (or enter into
negotiations to license) a Third Party or initiate a Licensor program in any of the specific disease indications listed on Exhibit D, without the prior consent of Licensee. Except for the foregoing, nothing in this Agreement will prevent
Licensor from granting licenses to any Third Parties for any disease indications or from initiating Licensor’s own programs for any disease indications, in either case, other than the specific disease indications within the Field. 

2.4.4 Notwithstanding Section 2.4.3 or anything herein to the contrary, nothing in this Agreement will prevent Licensor from
(a) granting non-exclusive research licenses to Third Parties in any field; or (b) maintaining Licensor’s commercial reagent and services business. 

2.5 Sublicensing. 
 2.5.1 The license
granted pursuant to Section 2.1 is sublicensable by Licensee to any Affiliates or Third Parties; provided that any such sublicense must comply with the provisions of this Section 2.5 (including Section 2.5.2). 

2.5.2 The right to sublicense granted to Licensee under this Agreement is subject to the following conditions: 

 

	 	(a)	Licensee may only grant sublicenses **** pursuant to a written sublicense agreement with the Sublicensee. Licensor must receive written notice as soon as practicable following execution of any such sublicenses.

  

	 	(b)	In each sublicense agreement, the Sublicensee must be required to comply with the terms and conditions of this Agreement to the same extent as Licensee has agreed and must acknowledge that Licensor is an express third
party beneficiary of such terms and conditions under such sublicense agreement; provided that nothing shall prevent Licensee from granting sublicenses of more limited scope than Licensee’s rights, e.g. in a more limited territory, field of use,
or term. 

  

	 	(c)	The official language of any sublicense agreement shall be English. 

  

	 	(d)	Within **** after entering into a sublicense, Licensor must receive a copy of the sublicense written in the English language for Licensor’s 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

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 records and to share with Licensor’s licensors under the Existing
Licenses. The copy of the sublicense may be redacted to exclude confidential information of the applicable Sublicensee, but such copy shall not be redacted to the extent that it impairs Licensor’s (or any of its licensors’) ability to
ensure compliance with this Agreement; provided that, if any of Licensor’s licensors require a complete, unredacted copy of the sublicense, Licensee shall provide such complete, unredacted copy. 

 

	 	(e)	Licensee’s execution of a sublicense agreement will not relieve Licensee of any of its obligations under this Agreement. Licensee is and shall remain **** to Licensor for all of Licensee’s duties and
obligations contained in this Agreement and for any act or omission of an Affiliate or Sublicensee that would be a breach of this Agreement if performed or omitted by Licensee, and Licensee will be deemed to be in breach of this Agreement as a
result of such act or omission. 

 2.6 Licensee’s Improvements. 

2.6.1 Licensee hereby grants to Licensor a non-exclusive, worldwide, ****, transferable, sublicensable, irrevocable, perpetual license: 

 

	 	(a)	to use any Licensed Back Improvements (and any intellectual property rights with respect thereto) consummate in scope to the Retained Rights; and 

 

	 	(b)	to practice the Licensed Back Improvements (and any intellectual property rights with respect thereto) in connection with any recombinant adeno-associated virus vectors, including the right to research, develop, make,
have made, use, offer for sale, and sell products and services; provided that, during the term of this Agreement, Licensor shall have no right under the license in this Section 2.6.1(b) to practice the Licensed Back Improvements in the Field.

 2.6.2 For purposes of this Agreement, “Licensed Back Improvements” means any patentable modifications or
improvements developed by Licensee, any Affiliates, or any Sublicensees to any vector that is the subject of a claim within the Licensed Patents. 

2.6.3 Licensee agrees to provide prompt notice to Licensor upon the filing of any patent application covering any Licensed Back Improvement,
together with a reasonably detailed description of or access to such Licensed Back Improvement to permit the practice of any such invention or improvement. 

2.7 Licensor Improvements. 
 2.7.1
Licensor agrees to provide notice within **** to Licensee upon the filing of any patent application covering any Licensor Improvement, together with a reasonably detailed description of or access to such Licensor Improvement to permit the practice
of any such 

  
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improvement. Upon the filing of any patent application covering any Licensor Improvement, Exhibit A attached hereto will be modified to add such patent application. 

2.7.2 If Licensor files any patent or patent application that would constitute a Licensor Improvement but for the temporal limitation in
Section 1.18(c), Licensor will within **** so inform Licensee, and, upon Licensee’s written request, Licensor will, on a non-exclusive basis, discuss in good faith licensing such patent or patent application to Licensee for use in
connection with the Licensed Products in the Field. 
 2.7.3 To the extent that the scope of Licensor’s rights to any Licensor
Improvements Controlled by Licensor pursuant to a Commercial License, as described in Section 1.18(c)(y), are less than or more restrictive than the license rights granted to Licensee pursuant to Section 2.1, then Licensee’s rights
with respect to such Licensor Improvements will be limited to the lesser or more restrictive rights Licensor can sublicense pursuant to the terms of the Commercial License. Examples of more restrictive provisions include Licensor’s rights being
limited to the following: (a) non-exclusive rights, (b) use in connection with only specific recombinant adeno-associate virus vectors, (c) use only in specific territories or specific fields, and (d) use only for research but
not commercial purposes. 
 2.8 Transfer of Licensed Know-How. 

2.8.1 During the **** period following the Effective Date, at Licensee’s sole expense, to the extent not previously disclosed to
Licensee, (a) Licensor will deliver to Licensee copies of Licensed Know-How set forth on Exhibit B in the form that such Licensed Know-How then exists; (b) Licensor will use commercially reasonable efforts to deliver, in the form
that such Licensed Know-How then exists, such additional Licensed Know-How not listed on Exhibit B that is reasonably requested in writing by Licensee; and (c) Licensor will otherwise disclose, through not more than two meetings with
Licensee personnel, other Licensed Know-How, which meetings will be at such times and in such places as are agreed to by the Parties. 

2.8.2 During the **** period following the date on which a disease indication is added to the Field pursuant to Section 2.4, at
Licensee’s sole expense, to the extent not previously disclosed to Licensee, (a) Licensor will use commercially reasonable efforts to deliver, in the form that such Licensed Know-How then exists, such Licensed Know-How described in
Section 1.14(b) that relates to such added disease indication that is reasonably requested in writing by Licensee; and (b) Licensor will otherwise disclose, through not more than two meetings with Licensee personnel, other Licensed
Know-How described in Section 1.14(b) with respect to such added disease indication, which meetings will be at such times and in such places as are agreed to by the Parties. 

2.8.3 Notwithstanding the foregoing, with respect to any Licensed Know-How not in Licensor’s possession, Licensor’s obligation will
be limited to using reasonable efforts to cause such copies to be delivered to Licensee. Licensee acknowledges and agrees that all Licensed Know-How disclosed pursuant to this Section 2.8 will be deemed “Confidential Information” of
Licensor, regardless of whether such information is marked or identified as confidential and without an obligation to summarize oral information. 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 2.9 Covenants Related to Existing Licenses. During the term of this Agreement,
without the prior written consent of Licensee, which consent shall not be unreasonably withheld, Licensor agrees not to exercise its right to terminate and will not amend either of the Existing Licenses if such termination or amendment would
materially, adversely alter the rights of Licensee under this Agreement. During the term of this Agreement, if Licensor receives a notice of termination under Section 6.3 of the Penn License, Licensor will so notify Licensee no later than ****
before expiration of the applicable cure period and provide the particulars of the alleged breach. 
 ARTICLE 3: CONSIDERATION 

3.1 Initial Fee. In consideration of the license granted to Licensee under Section 2.1, Licensee shall issue to Licensor 10,000 shares of Common
Stock of Licensee pursuant to that certain Dimension Therapeutics, Inc. Common Stock Purchase Agreement of even date herewith. 
 3.2 Annual Maintenance
Fee. In consideration of the license granted to Licensee under Section 2.1, Licensee shall pay Licensor on-going annual maintenance fees of **** for each disease indication within the Field, which fees will be due on each anniversary of the
Effective Date. 
 3.3 Royalties. In further consideration of the license granted to Licensee under Section 2.1, Licensee shall pay to Licensor
the following royalties based upon Net Sales of Licensed Products, subject to the reductions in royalty rates set forth in Section 3.3.1: 
  

					
	 Cumulative Annual Net Sales of all Licensed Products Worldwide
	  	Royalty Percentage	 
	 Portion of Net Sales less than ****
	  	 	****	  
	 Portion of Net Sales between (and including) **** through (and including) ****
	  	 	****	  
	 Portion of Net Sales greater than ****
	  	 	****	  

 3.3.1 Adjustment of Royalties. The Parties acknowledge that the royalties set forth in this
Section 3.3 have been set at an ****. 
  

	 	(a)	If, after the Effective Date, ****, which amendment the Parties will negotiate in good faith. 

  

	 	(b)	If, after the Effective Date, Licensee determines that (x) one or more Licensed Products (i) would fall within **** or (ii) would be entitled to a ****, or (y) Licensor would be entitled to ****

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 

	 	
****, Licensee may provide Licensor with written notice thereof and reasonable documentation supporting Licensee’s determination. Upon receipt thereof, Licensor will negotiate in good faith
regarding whether Licensee’s determination is correct and, if the Parties agree, an appropriate amendment to the royalties set forth in this Section 3.3. 

 

	 	(c)	Negotiations for any adjustments to royalties under this Section 3.3.1 will take into account the royalties **** in the aggregate, as well as any ****. 

3.3.2 Royalty Payment Period. Licensee’s obligation hereunder for payment of a royalty under this Section 3.3 on the Net
Sales of Licensed Products in a given country will end on a country-by-country basis ****. 
 3.4 Third Party Obligations. In consideration of the
license granted to Licensee under Section 2.1, Licensee agrees to the following: 
 3.4.1 Assumption of Obligations. Licensee
acknowledges that certain Licensed Technology is licensed to Licensor pursuant to the Existing Licenses and will be sublicensed to Licensee hereunder. In addition to the obligations set forth herein, Licensee expressly agrees to be bound by and
comply with all applicable provisions of the Existing Licenses to the extent such provisions apply to Licensee’s or any of its Affiliates’ or any Sublicensees’ exploitation of Licensed Technology under this Agreement. To the extent
that (a) any Licensed Technology is Controlled by Licensor pursuant to the Existing Licenses and sublicensed to Licensee under this Agreement and (b) the scope of rights granted under such Existing Licenses are less than the rights granted
hereunder (such as Licensor’s rights under the Existing Licenses being limited to non-exclusive rights), Licensee acknowledges that Licensee’s rights and licenses hereunder with respect to such Licensed Technology are limited to such
lesser scope. 
 3.4.2 Third Party Reports and Payments. 
  

	 	(a)	Licensee will pay any milestone amounts owed under Section 3.2 of the GSK Agreement that are owed with respect to activities of Licensee in exercising its license under this Agreement. Licensee’s obligation
under this Section 3.4.2(a) for payments shall continue for so long as any payment obligations are due during the term of this Agreement under the Existing Licenses. For the avoidance of doubt, Licensee will not be deemed to owe a milestone
amount if Licensor or a different licensee of Licensor achieves the milestone for which a payment is due prior to Licensee achieving such milestone. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
  

	 	(b)	To the extent that any payment under Section 3.3 or 3.4.2(a) is deemed “Sublicensing Revenues” under Section 3.5 of the Penn Agreement or sublicensee fees under Section 3.4 of the GSK Agreement
(collectively, “Sublicensing Fees”), Licensee will gross up such payments to ensure that Licensor receives exactly the amount that is owed for such payment under this Agreement and the Sublicensing Fees under the Existing Licenses.

  

	 	(c)	Licensee will make all payments due with respect to the Existing Licenses to Licensor not less than **** prior to the date on which such amounts must be paid by Licensor to its licensors under the applicable Existing
Licenses. 

  

	 	(d)	Licensee agrees to submit and to require its Affiliates and Sublicensees to submit to Licensor (or as otherwise directed by Licensor) all reports, including development and diligence reports, that Licensor is required
to submit or pay pursuant to the Existing Licenses and all payments that Licensee has agreed to make as set forth in Section 3.4.2(a), in each case, to the extent such reports or payments are triggered by or otherwise result from
Licensee’s and its Affiliates’ and any Sublicensees’ exploitation of Licensed Technology under this Agreement. Unless otherwise agreed, with respect to any reporting and payment obligations under the Existing Licenses, Licensee (or
its Affiliates or any Sublicensees) will provide the required reports to Licensor in sufficient time for Licensor to provide them to the applicable licensor within the time periods required by the applicable Existing License; provided that such
reports will be provided to Licensor by not less than **** prior to the date on which such reports must be delivered by Licensor to its licensors under the applicable Existing License. All financial reports required to be delivered will be certified
by the chief financial officer of Licensee. 

  

	 	(e)	Without limiting the foregoing, within **** after the occurrence of a milestone event requiring a payment under either Existing License, Licensee will deliver to Licensor a report describing the milestone event that
occurred and the date on which it occurred. 

 3.5 Reports and Records. 

3.5.1 Licensee must deliver to Licensor within **** after the end of each Calendar Quarter after the first commercial sale of a Licensed
Product a report setting forth the calculation of the royalties due to Licensor for such Calendar Quarter, including: 
  

	 	(a)	Number of Licensed Products included within Net Sales, listed by country; 

  

	 	(b)	Gross consideration for Net Sales of Licensed Product, including all amounts invoiced, billed, or received; 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
  

	 	(c)	Qualifying costs to be excluded from the gross consideration, as described in Section 1.22, listed by category of cost; 

  

	 	(d)	Net Sales of Licensed Products listed by country; 

  

	 	(e)	Royalties owed to Licensor, listed by category; and 

  

	 	(f)	The computations for any applicable currency conversions. 

 3.5.2 Licensee shall pay the
royalties due under Section 3.3 within **** following the last day of the Calendar Quarter in which the royalties accrue. Licensee shall send the royalty payments along with the report described in Section 3.5.1. 

3.5.3 All financial reports under this Section 3.5 will be certified by the chief financial officer of Licensee. 

3.5.4 Licensee shall maintain and require its Affiliates and all Sublicensees to maintain, complete and accurate books and records that enable
the royalties, fees, and payments payable under this Agreement (directly or through the Existing Licenses) to be verified. The records must be maintained for **** after the submission of each report under Article 3. Upon reasonable prior written
notice to Licensee, Licensee and its Affiliates and all Sublicensees will provide Licensor (and its accountants) with access to all of the relevant books, records, and related background information required to conduct a review or audit of the
royalties, fees, and payments payable to Licensor under this Agreement to be verified. Access will be made available: (a) during normal business hours; (b) in a manner reasonably designed to facilitate the auditing party’s review or
audit without unreasonable disruption to Licensee’s business; and (c) no more than once each calendar year during the term of this Agreement and for a period of **** thereafter. Licensee will promptly pay to Licensor the amount of any
underpayment determined by the review or audit, plus accrued interest. If the review or audit determines that Licensee has underpaid any payment by **** or more, then Licensee will also promptly pay the costs and expenses of Licensor and accountants
in connection with the review or audit. Without limiting the foregoing, Licensee acknowledges that its books and records will also be subject to the separate audit right of Licensor’s licensors in accordance with the terms of the Existing
Licenses. 
 3.6 Currency, Interest. 

3.6.1 All dollar amounts referred to in this Agreement are expressed in United States dollars. All payments to Licensor under this Agreement
must be made in United States dollars. 
 3.6.2 If Licensee receives payment in a currency other than United States dollars for which
a royalty or fee or other payment is owed under this Agreement, then (a) the payment will be converted into United States dollars at the conversion rate for the foreign currency as published in the eastern edition of the Wall Street Journal,
N.Y. edition, as of the last business day of the Calendar Quarter in which the payment was received by Licensee; and (b) the conversion computation will be documented by Licensee in the applicable report delivered to Licensor under Section
3.5. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 3.6.3 All amounts that are not paid by Licensee when due will accrue
interest from the date due until paid at a rate equal to 1.5% per month (or the maximum allowed by law, if less). 
 ARTICLE 4:
DILIGENCE 
 4.1 Diligence Obligations. Licensee will use commercially reasonable efforts to develop, commercialize, market, promote, and sell
Licensed Products in each of the disease indications within the Field. Commercially reasonable efforts means efforts equivalent to those utilized by ****. 

4.2 Specific Milestones. Without limiting Section 4.1, Licensee will meet the following milestones: 

 

			
	 Event
	  	 Date

	 (a) Closing of $**** in financing
	  	**** from Effective Date
		
	 (b) Milestones will be set forth in the initial Development Plan for the hemophilia A indication described in Section 1.11(a) and
agreed upon by the Parties
	  	****
		
	 (c) Milestones will be set forth in the initial Development Plan for the hemophilia B indication described in Section 1.11(b) and
agreed upon by the Parties
	  	****
		
	 (d) Filing of an investigational new drug application with the FDA for the proposed initial clinical trial of a Licensed Product
targeting the first additional specific disease indication (as set forth in Section 1.11(c))
	  	**** from the date on which the specific disease indication is added to the Field pursuant to Section 2.4
		
	 (e) Filing of an investigational new drug application with the FDA for the proposed initial clinical trial of a Licensed Product
targeting the second additional specific disease indication (as set forth in Section 1.11(c))
	  	**** from the date on which the specific disease indication is added to the Field pursuant to Section 2.4

 Licensee will provide Licensor written notice within **** of the accomplishment of each of the foregoing milestones. For the
avoidance of doubt, a breach of the milestone in (a) above will be deemed a breach with respect to all disease indications within the Field. If Licensee fails to meet a milestone for a particular disease indication within the Field, the date of
the milestone (****) may, at Licensee’s option, be extended for a period of **** from the original deadline date upon a payment to Licensor of **** within **** of the original deadline date; provided that Licensee will be entitled only to ****
for each disease indication within the Field, and each **** 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
will require a separate payment of ****. 
 The Parties agree that the failure of Licensee to achieve
a specific milestone contained in this Section 4.2 or in a Development Plan described in Section 4.3 for reasons beyond Licensee’s reasonable control **** will not be considered a material breach hereunder; ****. 

4.3 Development Plans 
 4.3.1 For each
disease indication and corresponding Licensed Product in the Field, Licensee will prepare and deliver to Licensor a development plan and budget (each a “Development Plan”). The initial Development Plans for the initial two
indications set forth in Section 1.11(a) or (b) will be delivered within **** after the Effective Date, and the Development Plan for each of the subsequent indications set forth in Section 1.11(c) will be delivered within **** of the
date on which the applicable indication is added to the Field pursuant to Section 2.4. 
 4.3.2 Each Development Plan will cover the
next two years, and will include future development activities to be undertaken by Licensee, its Affiliates, or any Sublicensees during the next reporting period under Section 4.4 relating directly to the Licensed Product, Licensee’s
strategy to bring the Licensed Product to commercialization, and projected timeline for completing the necessary tasks to accomplish the goals of the strategy. 

4.3.3 Following receipt by Licensor of each Development Plan, Licensor will promptly notify Licensee of any comments or requested revisions,
and the Parties will thereupon negotiate any appropriate revisions in good faith. With respect to developmental milestones to be set forth in the initial Development Plans for each of the initial two indications set forth in Section 1.11(a) or
(b), the Parties will agree upon reasonable milestones and completion dates to be set forth in the Development Plan (and any amendments thereto). 
 4.4
Reporting. Within **** after the Effective Date and within **** of each December 1 thereafter, Licensee shall provide Licensor with written progress reports, setting forth in such detail as Licensor may reasonably request, the progress
of the development, evaluation, testing, and commercialization of each Licensed Product pursuant to each Development Plan. Licensee will also notify Licensor within **** of the first commercial sale by Licensee, its Affiliates, or any Sublicensees
of each Licensed Product. Such a report (“Development Progress Report”), setting forth the current stage of development of Licensed Products, shall include: 

4.4.1 Date of Development Progress Report and time covered by such report; 

4.4.2 Major activities and accomplishments completed by Licensee, its Affiliates, and any Sublicensees relating directly to the Licensed
Product since the last Development Progress Report; 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 4.4.3 Significant research and development projects relating directly to
the Licensed Product currently being performed by Licensee, its Affiliates, and any Sublicensees and projected dates of completion; 
 4.4.4
Updates to each Development Plan, including coverage of the next two years; 
 4.4.5 Projected total development remaining before product
launch of each Licensed Product; and 
 4.4.6 Summary of significant development efforts using the Licensed Technology being performed by
Third Parties, including the nature of the relationship between Licensee and such Third Parties. 
 4.5 Confidential Information. The Parties agree
that Development Progress Reports shall be deemed Licensee’s Confidential Information; provided that Licensor may share a copy of such reports with its licensors under the Existing Licenses. 

4.6 Improvements. Simultaneously with the Development Progress Report, Licensee shall deliver a detailed description of any Licensed Back Improvements,
if not previously provided pursuant to Section 2.6.3. 
 4.7 Exclusivity. **** 

ARTICLE 5: CONFIDENTIALITY 
 5.1
Treatment of Confidential Information. Each Party, as a receiving party (a “Receiving Party”), agrees that it will (a) treat Confidential Information of the other Party (the “Disclosing Party”) as
strictly confidential; (b) not disclose such Confidential Information to Third Parties without the prior written consent of the Disclosing Party, except as may be permitted in this Agreement; provided that any disclosure permitted hereunder be
under confidentiality agreements with provisions at least as stringent as those contained in this Agreement; and (c) not use such Confidential Information for purposes other than those authorized expressly in this Agreement. The Receiving Party
agrees to ensure that its employees who have access to Confidential Information are obligated in writing to abide by confidentiality obligations at least as stringent as those contained under this Agreement. 

5.2 Public Announcements. The Parties agree they will release a joint press release in the form attached hereto as Exhibit E. Except as provided
in Section 5.3, any other press releases by either Party with respect to the other Party or any other public disclosures concerning the existence of or terms of this Agreement shall be subject to review and approval by the other 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Party. Once the joint press release or any other written statement is approved for
disclosure by both Parties, either Party may make subsequent public disclosure of the contents of such statement without the further approval of the other Party. 

5.3 Authorized Disclosure. Notwithstanding the provisions of Section 5.1 or 5.2, either Party may disclose Confidential Information or make such a
disclosure of the existence of and/or terms of this Agreement to any ****; provided that, in each case, such recipient of Confidential Information is obligated to keep such information confidential on terms no less stringent than those set forth in
this Agreement. Furthermore, Licensee agrees that Licensor may share a copy of this Agreement, reports and notices provided by Licensee to Licensor pursuant to the terms of this Agreement, and copies of sublicense agreements provided to Licensor
hereunder with any of Licensor’s direct and indirect licensors of the Licensed Technology. In the event that the Receiving Party receives service of legal process that purports to compel disclosure of the Disclosing Party’s Confidential
Information or becomes obligated by law to disclose the Confidential Information of the Disclosing Party or the existence of or terms of this Agreement to any governmental authority, the Receiving Party shall promptly notify the Disclosing Party, so
that the Disclosing Party may seek an appropriate protective order or other remedy with respect to narrowing the scope of such requirement and/or waive compliance by the Receiving Party with the provisions of this Agreement. The Receiving Party will
provide the Disclosing Party with reasonable assistance in obtaining such protective order or other remedy. If, in the absence of such protective order or other remedy, the Receiving Party is nonetheless required by law to disclose the existence of
or terms of this Agreement or other Confidential Information of the Disclosing Party, the Receiving Party may disclose such Confidential Information without liability hereunder; provided that the Receiving Party shall furnish only such portion of
the Confidential Information that is legally required to be disclosed and only to the extent required by law. 
 5.4 Term of Confidentiality. The
obligations of this Article 5 shall continue for a period of **** following the expiration or termination of this Agreement. 
 ARTICLE 6:
TERM AND TERMINATION 
 6.1 Term of Agreement. This Agreement, unless sooner terminated as provided in this Agreement, expires upon the
expiration, lapse, abandonment, or invalidation of the last Valid Claim to expire, lapse, or become abandoned or unenforceable in all countries of the world. Upon expiration of this Agreement (but not early termination), Licensee’s license to
Licensed Know-How under Section 2.1 will become non-exclusive, perpetual, irrevocable, royalty-free with respect to the Licensed Know-How owned by Licensor and will continue with respect to all other Licensed Know-How for so long as
Licensor’s rights continue under the Existing Licenses (subject to Licensee paying any ongoing amounts due under the Existing Licenses and complying with any applicable ongoing obligations under the Existing Licenses); but, for the avoidance of
doubt, such license will remain limited to the Field and subject to the Retained Rights. 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 6.2 Licensee’s Right to Terminate. Licensee may, upon **** prior written
notice to Licensor, terminate this Agreement for any reason. In exercising such termination right, Licensee may terminate the Agreement in its entirety or, if desired, Licensee may specify in the written notice that this Agreement is terminating
only with respect to one or more of the disease indications within the Field. 
 6.3 Termination for Breach. 

6.3.1 Licensor may terminate this Agreement, if Licensee is late in paying to Licensor royalties, fees, or any other monies due under this
Agreement, and Licensee does not pay Licensor in full within **** upon written demand from Licensor, which termination shall be effective immediately upon the expiration of such **** cure period. 

6.3.2 Either Party may terminate this Agreement, if the other Party materially breaches this Agreement and does not cure such material breach
within **** after written notice of the breach, which termination shall be effective immediately upon the expiration of such **** cure period; provided that, if termination is by Licensor as a result of Licensee’s materially breaching Article
4, and if such breach only relates to one disease indication within the Field, but not all, then Licensor’s termination right shall only be with respect to the disease indication with respect to which the breach related and not the remaining
disease indications. 
 6.3.3 Notwithstanding the foregoing, if Licensee disputes in good faith that a payment is due or that such material
breach exists, and gives Licensor written notice of such dispute within ****, in the case of payment, or ****, in the case of a material breach, following Licensee’s receipt of Licensor’s notice of default, then, Licensor may not terminate
this Agreement until the dispute is resolved in accordance with Section 10.6 (and a payment is found to be due or a breach found to have occurred); provided that Licensor will be entitled to terminate this Agreement at the end of the original
**** or **** cure period, as applicable, without waiting for resolution of the dispute in accordance with Section 10.6, if the breach by Licensee of this Agreement would cause Licensor to be in breach of the GSK Agreement or the Penn Agreement.

 6.4 Termination for Insolvency. 

6.4.1 Licensor may terminate this Agreement, effective immediately upon written notice to Licensee, if Licensee any of its Controlling
Affiliates experiences any Trigger Event. “Controlling Affiliate” means an Affiliate that directly or indirectly controls Licensee within the meaning of Section 1.1. 

6.4.2 Licensee shall include in each sublicense agreement entered into with a Sublicensee a right of Licensee to terminate such sublicense
agreement if such Sublicensee experiences any Trigger Event; and Licensee shall terminate the sublicense agreement, effective immediately upon written notice to the Sublicensee, if the Sublicensee experiences any Trigger Event. In addition, if the
Sublicensee’s experiencing of a Trigger Event gives Licensor’s licensor a right of termination under the Penn Agreement and such licensor threatens to terminate the Penn Agreement, then, upon receipt of notice to such effect, Licensor may
terminate this 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
Agreement, effective immediately upon written notice to Licensee, if the Sublicensee experiences any Trigger Event. 

6.4.3 For purposes of this Section 6.4, “Trigger Event” means any of the following: (a) if Licensee, any
Controlling Affiliate, or any Sublicensee, as applicable, (i) becomes insolvent, becomes bankrupt, or generally fails to pay its debts as such debts become due, (ii) is adjudicated insolvent or bankrupt, (iii) admits in writing its
inability to pay its debts, (iv) suffers the appointment of a custodian, receiver, or trustee for it or its property and, if appointed without its consent, is not discharged within ****, (v) makes an assignment for the benefit of
creditors, or (vi) suffers proceedings being instituted against it under any law related to bankruptcy, insolvency, liquidation, or the reorganization, readjustment, or release of debtors and, if contested by it, not dismissed or stayed within
****; (b) the institution or commencement by Licensee, any Controlling Affiliate, or any Sublicensee, as applicable, of any proceeding under any law related to bankruptcy, insolvency, liquidation, or the reorganization, readjustment, or release
of debtors; (c) the entering of any order for relief relating to any of the proceedings described in Section 6.4.3(a) or (b) above; (d) the calling by Licensee, any Controlling Affiliate, or any Sublicensee, as applicable, of a
meeting of its creditors with a view to arranging a composition or adjustment of its debts; or (e) the act or failure to act by Licensee, any Controlling Affiliate, or any Sublicensee, as applicable, indicating its consent to, approval of, or
acquiescence in any of the proceedings described in Section 6.4.3(b) through (d) above. 
 6.5 Patent Challenge. 

6.5.1 Licensor may terminate this Agreement, effective immediately upon written notice to Licensee, upon the commencement by Licensee or any
of its Affiliates of a Patent Challenge. 
 6.5.2 Licensee shall include in each sublicense agreement entered into with a Sublicensee a
right of Licensee to terminate such sublicense agreement if such Sublicensee commences a Patent Challenge; and Licensee shall terminate the sublicense agreement, effective immediately upon written notice to the Sublicensee, if the Sublicensee
commences a Patent Challenge. In addition, if the Sublicensee’s commencement of a Patent Challenge gives Licensor’s licensor a right of termination under the Penn Agreement and such licensor threatens to terminate the Penn Agreement, then,
upon receipt of notice to such effect, Licensor may terminate this Agreement, effective immediately upon written notice to Licensee, if the Sublicensee commences a Patent Challenge. 

6.5.3 For purposes of this Section 6.5, “Patent Challenge” means any action against Licensor or the University of
Pennsylvania or SmithKline Beecham Corporation (or their successors under the Existing Licenses), including an action for declaratory judgment, to declare or render invalid or unenforceable the Licensed Patents, or any claim thereof. 

6.6 Effects of Termination. The effect of termination by Licensee pursuant to Section 6.2, by either Party, as applicable, under Section 6.3,
or by Licensor pursuant to Section 6.4 or 6.5 shall be as follows: 

  
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REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 6.6.1 The licenses granted by Licensor hereunder shall terminate, and
Licensee, its Affiliates, and (unless the sublicense agreement is assigned pursuant to Section 6.6.2) all Sublicensees shall cease to make, have made, use, import, sell, and offer for sale all Licensed Products and shall cease to otherwise
practice the Licensed Technology; provided that Licensee, its Affiliates, and Sublicensees, shall have the right to continue to sell their existing inventories of Licensed Products for a period not to exceed **** after the effective date of such
termination; 
 6.6.2 Licensee shall assign to Licensor any or all sublicenses granted to Third Parties to the extent of the rights licensed
to Licensee hereunder and sublicensed to the Sublicensee; provided that (i) prior to such assignment, Licensee shall advise Licensor whether such Sublicensee is then in full compliance with all terms and conditions of its sublicense and
continues to perform thereunder, and, if such Sublicensee is not in full compliance or is not continuing to perform, Licensor may elect not to have such sublicense assigned; and (ii) following such assignment, Licensor shall not be liable to
such Sublicensee with respect to any obligations of Licensee to the Sublicensee that are not consistent with, or not required by, Licensor’s obligations to Licensee under this Agreement; and all sublicenses not requested to be assigned to
Licensor shall terminate; 
 6.6.3 If termination is by Licensee pursuant to Section 6.2 or by Licensor pursuant to Section 6.3,
6.4, or 6.5, 
  

	 	(a)	Licensee shall grant, and hereby grants (effective only upon any such termination of this Agreement), to Licensor a non-exclusive, perpetual, irrevocable, worldwide, ****, transferable, sublicensable license under any
patentable modifications or improvements (and any intellectual property rights with respect thereto) developed by Licensee, any Affiliates, or any Sublicensees to any vector that is the subject of a claim within any of the Licensed Patents, for use
by Licensor for the research, development, and commercialization of products in any therapeutic indication; 

  

	 	(b)	Licensee shall grant, and hereby grants (effective only upon any such termination of this Agreement), to Licensor an exclusive (even as to Licensee), worldwide, ****, transferable, perpetual license, with the right to
grant sublicenses, under the Licensee Technology to make, have made, use, import, sell, and offer for sale Licensed Products solely in the Field. For this purpose, the “Licensee Technology” means Licensee’s patents, Know-How,
and other intellectual property that improvements or modifications to or that are based on or derived in whole or in part from or that otherwise relate to any Licensed Technology to the extent such patents, Know-How, or other intellectual property
pertains to (i) a recombinant adeno-associated virus vector or (ii) any expression construct provided by Licensor to Licensee as part of the Licensed Technology. To effectuate such license, upon any such termination of this Agreement,
Licensee will promptly disclose to Licensor all Licensee Technology not already known to Licensor; and 

  
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OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
  

	 	(c)	Licensee will transfer to Licensor ownership of any regulatory approvals then in Licensee’s, its Affiliate’s, or any Sublicensee’s name related to Licensed Products containing any expression construct
provided by Licensor to Licensee as part of the Licensed Technology and notify the appropriate regulatory authorities and take any other action reasonably necessary to effect such transfer of ownership. If ownership of any such regulatory approval
cannot be transferred to Licensor in any country, Licensee hereby grants (effective only upon any such termination of this Agreement) to Licensor a permanent, exclusive (even as to Licensee), and irrevocable right of access and reference to such
regulatory approvals for Licensed Products containing any expression construct provided by Licensor to Licensee as part of the Licensed Technology in such country in the Field. 

6.6.4**** 
 6.6.5 Licensee shall
pay all monies then-owed to Licensor under this Agreement; and 
 6.6.6 Each Receiving Party shall, at the other Party’s request,
return all Confidential Information of the Disclosing Party. Notwithstanding the foregoing, one copy may be kept by either Party for a record of that Party’s obligations. 

If termination is only with respect to a particular disease indication within the Field, but not all disease indications, then the provisions of this
Section 6.6 shall only apply with respect to the terminated disease indications, and this Agreement shall continue with respect to the non-terminated disease indications. 

6.7 Survival. Licensee’s obligation to pay all monies due and owed to Licensor under this Agreement which have matured as of the effective date of
termination or expiration shall survive the termination or expiration of this Agreement. In addition, the provisions of Section 2.2 (Retained Rights), 2.3 (Government Rights), 2.6 (Licensee’s Improvements), 3.4 (if this Agreement expires
and there are any continuing obligations under the Existing Licenses applicable to Licensee’s continuing activities following expiration), Article 3 (Consideration) (with respect to any final reports or to the extent any amounts are due but
unpaid), Section 3.5 (Reports and Records), Article 5 (Confidentiality), Article 6 (Term and Termination) except for Section 6.5, Section 8.3 (Disclaimer of Warranties, Damages), Section 8.4 (Indemnification), Section 8.5
(Insurance), Article 9 (Use of Name), and Article 10 (Additional Provisions) shall survive such termination or expiration of this Agreement in accordance with their respective terms. 

  
 23 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 ARTICLE 7: PATENT MAINTENANCE; PATENT INFRINGEMENT 

7.1 Prosecution of Licensed Patents. As between Licensor and Licensee, the Parties agree as follows: 

7.1.1 Licensor shall have the sole right, but not the obligation, to Prosecute patent applications and issued patents within Licensed Patents,
in Licensor’s sole discretion. Subject to Section 7.1.3, Licensor shall provide Licensee with a reasonable opportunity to review and provide comments in connection with the Prosecution of the Licensed Patents; and Licensor shall keep
Licensee reasonably informed as to all material developments with respect to such Licensed Patents and shall supply to Licensee copies of material communications received and filed in connection with the Prosecution of such Licensed Patents. 

7.1.2 Nothing in this Agreement obligates Licensor to continue to Prosecute any patent applications or issued patents, and Licensee
acknowledges that Licensor shall have no obligation to undertake any inter-party proceedings, such as oppositions or interferences, or to undertake any re-examination or re-issue proceedings, in either case, with respect to the Licensed Patents.

 7.1.3 Licensee acknowledges that the University of Pennsylvania controls Prosecution of the Licensed Patents, with Licensor having
certain rights to review. Licensee acknowledges and agrees that (a) the rights and obligations under this Section 7.1 are subject to the rights of Licensor’s licensors under the Existing Licenses, and (b) Licensor’s
obligations under this Agreement only apply to the extent of Licensor’s rights with respect to participation in Prosecuting the Licensed Patents under the Existing Licenses. 

7.2 Infringement Actions Against Third Parties. 

7.2.1 Licensee is responsible for notifying Licensor promptly of any infringement of Licensed Patents (other than Retained Rights) that may
come to Licensee’s attention. Licensee and Licensor shall consult one another in a timely manner concerning any appropriate response to the infringement. 

7.2.2 As between Licensor and Licensee, **** shall have the first right, but not the obligation, to prosecute any such infringement ****. In
any action to enforce any of the Licensed Patents, ****, at the request and expense of ****, shall cooperate to the fullest extent reasonably possible, including in the event that, if **** is unable to initiate or prosecute such action solely in its
own name, **** shall join such action voluntarily and shall execute all documents necessary to initiate litigation to prosecute, maintain, and settle such action. 

7.2.3 If **** elects not to pursue any infringement of a Licensed Patent, then, to the extent that a Licensed Product is covered by any such
License Patent and such Licensed Patent is being infringed by another product **** (such infringement, the “**** Infringement”), **** shall have the second right, but not the obligation, to prosecute such **** Infringement with
respect to such other product ****, at **** own expense. In any such action to enforce any of the Licensed Patents, ****, at the request and expense of ****, shall cooperate to the fullest extent reasonably possible, including in the event that, if
**** is unable to initiate or prosecute such action solely in its own name, 

  
 24 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
**** shall join such action voluntarily and shall execute all documents necessary to initiate litigation to prosecute and maintain such action. In prosecuting any such **** Infringement, ****
(a) shall not take any actions that would be detrimental to the Licensed Patents and **** rights with respect thereto **** and (b) shall not settle any such **** Infringement without the prior consent of ****. 

7.2.4 Any recovery of damages by **** for any infringement other than a **** Infringement shall be ****. Any recovery of damages by the Party
undertaking enforcement or defense of a suit for **** Infringement shall be applied, as between Licensor and Licensee but subject to the obligations to Licensor’s licensors under the Existing Licenses, first to reimburse each such Party for
costs and expenses (including reasonable attorneys’ fees and costs) incurred by such Party in connection with such suit, and the balance remaining, if any, from any such recovery shall be ****. 

7.2.5 Licensee acknowledges and agrees that (a) the rights and obligations under this Section 7.2 are subject to the rights of
Licensor’s licensors under the Existing Licenses (including any consent or approval rights or rights to control or participate in any enforcement actions); and (b) Licensor’s obligations under this Agreement only apply to the extent
that Licensor has any rights with respect to enforcing the Licensed Patents under the Existing Licenses. Furthermore, Licensee acknowledges the following: 

7.2.5.1 All monies recovered upon the final judgment or settlement of any action with respect to **** Infringement will also
need to be allocated to Licensor’s licensors under the Existing Licenses (a) to reimburse the costs and expenses (including reasonable attorneys’ fees and costs) of such licensors, (b) to take into account the royalties payable
to such licensors; and (c) to take into account the relative extent of such licensors’ financial participation in such action, if applicable. 

7.2.5.2 Licensor’s licensors under the Existing Licenses retain the continuing right to intervene at their own expense
and join Licensor or Licensee in any claim or suit for infringement of the Licensed Patents. 
 7.2.5.3 In any infringement
prosecuted by Licensors’ licensors under the Existing Licenses, all financial recoveries will be ****. 
 7.2.5.4 In
any infringement prosecuted by Licensor’s licensors under the Existing Licenses, **** agrees, at the request and expense of such licensors, to cooperate to the fullest extent reasonably possible, to the same extent as though **** were
prosecuting such suit (as provided in this Section 7.2, including Section 7.2.2). 
 7.2.5.5 The written consent
of **** under the **** will be required (a) for any decision that would have a materially adverse effect on the validity, scope of patent claims, or enforceability of the Patent Rights and (b) for any settlement or compromise of any
infringement suit that would impose any obligations or restrictions on any of its ****, or grants any rights to the Licensed Patents other than rights that ****. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 7.3 Defense of Infringement Claims. 

7.3.1 In the event Licensee or Licensor becomes aware that Licensee’s or any of its Affiliates’ or any Sublicensees’ practice
of the Licensed Patents is the subject of a claim for patent infringement by a Third Party, that Party shall promptly notify the other, and the Parties shall consider the claim and the most appropriate action to take. Licensee shall cause each of
its Affiliates and each Sublicensee to notify Licensee promptly in the event such entity becomes aware that its practice of the Licensed Patents is the subject of a claim of patent infringements by another. 

7.3.2 To the extent Licensor takes any action, Licensor (or its licensors under the Existing Licenses) shall have the right to require
Licensee’s reasonable cooperation in any such suit, upon written notice to Licensee; and Licensee shall have the obligation to participate upon Licensor’s request, in which event, ****. Without Licensor’s prior written permission,
Licensee must not settle or compromise any such suit in a manner that imposes any material obligations or restrictions on Licensor or any of its licensors under the Existing Licenses or grants any rights to the Licensed Patents other than rights
that Licensee has the right to grant under this Agreement. 
 ARTICLE 8: WARRANTIES; INDEMNIFICATION 

8.1 Warranty by Licensor. Licensor represents and warrants to Licensee as of the Effective Date: 

8.1.1 Licensor has the right, power, and authority to enter into this Agreement and to grant to Licensee the rights specified in this
Agreement; 
 8.1.2 This Agreement when executed shall become the legal, valid and binding obligation of it, enforceable against it, in
accordance with its terms; 
 8.1.3 There are no actions, suits, proceedings, or arbitrations pending or, to the Licensor’s knowledge,
threatened against Licensor relating to the Licensed Technology that would impact activities under this Agreement; 
 8.1.4 To
Licensor’s knowledge, (a) the Licensed Patents are solely owned by the University of Pennsylvania, and (b) no Third Party has any right, interest, or claim in or to such Licensed Patents in the Field that are inconsistent with those
granted to Licensee herein; 
 8.1.5 Licensor has not received any written notice from any Third Party patentee alleging infringement of,
and to Licensor’s knowledge Licensor has not been sued for patent infringement of, Third Party technology by the practice of the Licensed Patents in the Field; 

8.1.6 Licensor has not received any written notice from any of its licensors under the Existing Licenses informing Licensor that there are any
actions, suits, proceedings, or arbitrations pending against such licensors relating to the Licensed Patents that would impact activities under this Agreement; 

  
 26 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 8.1.7 To Licensor’s knowledge, Licensor does not Control (through
ownership or Control pursuant to the Existing Licenses) as of the Effective Date any patent or patent application (other than the Licensed Patents set forth on Exhibit A) that would necessarily be infringed by Licensee’s practice of the
Licensed Patents set forth on Exhibit A in connection with using, importing selling, and offering for sale of adeno-associated virus vectors claimed in such Licensed Patents in the Field. If it is determined, in accordance with the procedure
of this Section 8.1.7, that Licensor Controls (through ownership or Control pursuant to the Existing Licenses) as of the Effective Date a patent or patent application (other than the Licensed Patents) that would necessarily be infringed by
Licensee’s practice of the Licensed Patents set forth on Exhibit A in connection with using, importing selling, and offering for sale of adeno-associated virus vectors claimed in such Licensed Patents in the Field, then Licensor shall
include the applicable patent or patent application as a “Licensed Patent” hereunder but solely to the extent of the claim(s) that would necessarily be infringed by such practice of such Licensed Patents by Licensee, which inclusion shall
be Licensee’s sole remedy. At any time during the term of this Agreement, Licensee may notify Licensor in writing of any such patent or patent application that Licensee believes should be included as a “Licensed Patent” pursuant to
this Section 8.1.7. Such written notice shall identify the relevant patent or patent application and relevant claim(s) and shall explain briefly why Licensee, in good faith, believes it should be included as a “Licensed Patent.” If
Licensor does not agree with Licensee, Licensor shall have **** following Licensor’s receipt of Licensee’s written notice to notify Licensee that Licensor disputes the inclusion of such patent or patent application or the scope of the
remedy; in which event, such dispute will be resolved in accordance with Section 10.6. Upon the Parties’ agreement (or a resolution, in favor of Licensee, of the dispute pursuant to Section 10.6), the applicable claim(s) of the
applicable patent or patent application will be deemed a “Licensed Patent” hereunder. For the avoidance of doubt, Licensor makes no representation or warranty under this Section 8.1.7 as to any claim of (a) a patent or patent
application covering Manufacturing Technology or (b) a patent or patent application that is not Controlled by Licensor pursuant to the Existing Licenses or pursuant to Licensor’s ownership thereof, and Licensee acknowledges that
(i) Manufacturing Technology claims of any patents or patent applications or (ii) claims of any patents or patent applications not Controlled by Licensor pursuant to the Existing Licenses or pursuant to Licensor’s ownership thereof
will not be added as “Licensed Patents” pursuant to the procedure set forth in this Section 8.1.7; and 
 8.1.8 To
Licensor’s knowledge, the Existing Licenses are in full force and effect and Licensor is not in breach of any provisions thereof. 
 8.2 Warranty by
Licensee. Licensee represents and warrants to Licensor as of the Effective Date that: 
 8.2.1 Licensee has the right, power, and
authority to enter into this Agreement and to grant the rights granted by it hereunder; 
 8.2.2 This Agreement when executed shall become
the legal, valid and binding obligation of it, enforceable against it, in accordance with its terms; 
 8.2.3 Licensee has the ability and
the resources, including financial resources, necessary to carry out its obligations under this Agreement; and 

  
 27 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 8.2.4 There are no actions, suits, proceedings, or arbitrations pending
or, to the Licensee’s knowledge, threatened against Licensee that would impact activities under this Agreement. 
 8.3 Disclaimer of Warranties,
Damages. EXCEPT AS SET FORTH IN SECTIONS 8.1 AND 8.2, THE LICENSED TECHNOLOGY, LICENSED PRODUCTS, AND ALL RIGHTS LICENSED BY EITHER PARTY TO THE OTHER UNDER THIS AGREEMENT ARE PROVIDED ON AN “AS IS” BASIS, AND NEITHER PARTY MAKES ANY
REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT THERETO. BY WAY OF EXAMPLE BUT NOT OF LIMITATION, NEITHER PARTY MAKES ANY REPRESENTATIONS OR WARRANTIES, AND HEREBY DISCLAIMS ALL EXPRESS AND IMPLIED REPRESENTATIONS AND WARRANTIES,
(i) OF COMMERCIAL UTILITY, ACCURACY, COMPLETENESS, PERFORMANCE, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, VALIDITY OR ENFORCEABILITY OF ANY RIGHTS LICENSED BY EITHER PARTY TO THE OTHER, AND PROFITABILITY; OR (ii) THAT THE USE OF
ANY RIGHTS GRANTED BY EITHER PARTY TO THE OTHER, INCLUDING ANY PRODUCTS RESULTING THEREFROM, WILL NOT INFRINGE ANY PATENT, COPYRIGHT, TRADEMARK, OR OTHER PROPRIETARY RIGHTS OF THIRD PARTIES. EXCEPT AS SET FORTH HEREIN, NEITHER PARTY OR ANY OF SUCH
PARTY’S DIRECT OR INDIRECT LICENSORS SHALL BE LIABLE TO THE OTHER PARTY, ITS SUCCESSORS OR ASSIGNS, OR ANY SUBLICENSEES OF EITHER PARTY, OR ANY THIRD PARTY WITH RESPECT TO: (a) ANY CLAIM ARISING FROM USE OF ANY OR ALL RIGHTS LICENSED UNDER
THIS AGREEMENT OR FROM THE DEVELOPMENT, TESTING, MANUFACTURE, USE, OR SALE OF PRODUCTS ARISING THEREFROM; OR (b) ANY CLAIM FOR LOSS OF PROFITS, LOSS OR INTERRUPTION OF BUSINESS, OR FOR INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES OF ANY KIND, INCLUDING ANY ARISING FROM OR RELATING TO ANY BREACH OF THIS AGREEMENT OR THE EXERCISE OF RIGHTS HEREUNDER, REGARDLESS OF ANY NOTICE OF SUCH DAMAGES. NOTHING IN THIS SECTION 8.3 IS INTENDED TO LIMIT OR RESTRICT THE
INDEMNIFICATION RIGHTS OR OBLIGATIONS OF EITHER PARTY UNDER SECTION 8.4 OR TO LIMIT A PARTY’S LIABILITY FOR BREACHES OF ITS OBLIGATION REGARDING CONFIDENTIALITY UNDER Article 5. 

8.4 Indemnification. 
 8.4.1 By
Licensee. Licensee shall defend, indemnify, and hold harmless Licensor, its Affiliates, sublicensees, the licensors under the Existing Licenses, and their respective shareholders, members, partners, officers, trustees, faculty, students,
contractors, agents, and employees (individually, a “Licensor Indemnified Party” and, collectively, the “Licensor Indemnified Parties”) from and against any and all Third Party liability, loss, damage, action,
claim, fee, cost, or expense (including attorneys’ fees) (individually, a “Third Party Liability” and, collectively, the “Third Party Liabilities”) suffered or incurred by the Licensor Indemnified Parties from
claims of such Third Parties that result from or arise out of: **** 

  
 28 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
****; provided, however, that Licensee shall not be liable for claims based on any breach by Licensor of the representations, warranties, or obligations of this Agreement or the gross negligence
or intentional misconduct of any of the Licensor Indemnified Parties. Without limiting the foregoing, Licensee must defend, indemnify, and hold harmless the Licensor Indemnified Parties from and against any Third Party Liabilities resulting from:

  

	 	(a)	any **** or other claim of any kind related to the **** by a Third Party of a **** by Licensee, its Affiliates, any Sublicensees, their respective assignees, or vendors; 

 

	 	(b)	any claim by a Third Party that the ****; and 

  

	 	(c)	**** conducted by or on behalf of Licensee, its Affiliates, any Sublicensees, their respective assignees, or vendors relating to the Licensed Technology or Licensed Products, including any claim by or on behalf of a
****. 

 8.4.2 By Licensor. Licensor shall defend, indemnify, and hold harmless Licensee, its Affiliates and
Sublicensees and their respective shareholders, members, partners, officers, trustees, contractors, agents, and employees (individually, a “Licensee Indemnified Party” and, collectively, the “Licensee Indemnified
Parties”) from and against any and all Third Party Liabilities suffered or incurred by the Licensee Indemnified Parties from claims of such Third Parties that result from or arise out of: ****; provided, however, that Licensor shall not be
liable for claims based on any breach by Licensee of the representations, warranties, or obligations of this Agreement or the gross negligence or intentional misconduct of any of the Licensor Indemnified Parties. 

8.4.3 Indemnification Procedure. Each Party, as an indemnifying party (an “Indemnifying Party”), shall not be
permitted to settle or compromise any claim or action giving rise to Third Party Liabilities in a manner (i) that imposes any restrictions or obligations on the indemnified party (an “Indemnified Party”) or, if Licensee is the
Indemnifying Party, on Licensor’s licensors under the Existing Licenses, without the other Party’s prior written consent, (ii) if Licensee is the Indemnifying Party, that grants any rights to the Licensed Technology or Licensed
Products other than those Licensee has the right to grant under this Agreement without Licensor’s prior written consent, or (iii) if Licensor is the Indemnifying Party, that grants any rights that are inconsistent with those granted to
Licensee under this Agreement without 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
Licensee’s prior written consent. The Indemnifying Party shall be permitted to control any litigation or potential litigation involving the defense of any claim subject to indemnification
pursuant to this Section 8.4, including the selection of counsel, with the reasonable approval of the Indemnified Party. If an Indemnifying Party fails or declines to assume the defense of any such claim or action within **** after notice
thereof, the Indemnified Party may assume the defense of such claim or action at the cost and risk of the Indemnifying Party, and any Third Party Liabilities related thereto shall be conclusively deemed a Third Party Liability of the Indemnifying
Party. The indemnification rights of a Indemnified Party contained in this Agreement are in addition to all other rights which such Indemnified Party may have at law or in equity or otherwise. The Indemnifying Party will pay directly all Third Party
Liabilities incurred for defense or negotiation of any claim hereunder or will reimburse the Indemnified Party for all documented Third Party Liabilities incident to the defense or negotiation of any such claim within **** after the Indemnifying
Party’s receipt of invoices for such fees, expenses, and charges. 
 8.5 Insurance. Within **** of the Effective Date, Licensee will procure and
maintain insurance policies for the following coverages with respect to product liability, personal injury, bodily injury, and property damage arising out of Licensee’s (and its Affiliates’ and any Sublicensees’) performance under
this Agreement: (a) during the term of this Agreement, comprehensive general liability, including broad form and contractual liability, in a minimum amount of **** combined single limit per occurrence (or claim) and in the aggregate annually;
(b) prior to the commencement of clinical trials involving Licensed Products and thereafter for a period of not less than **** (or such longer period as Licensee is required by applicable law to continue to monitor the participants in the
clinical trial), clinical trials coverage in amounts that are reasonable and customary in the U.S. pharmaceutical industry, subject always to a minimum limit of **** combined single limit per occurrence (or claim) and in the aggregate annually; and
(c) from **** of a Licensed Product until **** after the last sale of a Licensed Product, product liability coverage, in amounts that are reasonable and customary in the U.S. pharmaceutical industry, subject always to a minimum limit of ****
combined single limit per occurrence (or claim) and in the aggregate annually. Licensee acknowledges that Licensor’s licensors under the Existing Licenses may review periodically the adequacy of the minimum amounts of insurance for each
coverage required by the Existing Licenses, and Licensor reserves the right to require Licensee to adjust the limits set forth in this Section 8.5 to conform to any adjustments made by Licensor’s licensors under the Existing Licenses. The
required minimum amounts of insurance do not constitute a limitation on Licensee’s liability or indemnification obligations to the Licensor Indemnified Parties under this Agreement. The policies of insurance required by this Section 8.5
will be issued by an insurance carrier with an A.M. best rating of **** or better and will name Licensor as an additional insured with respect to Licensee’s performance (and its Affiliates’ and any Sublicensees’) under this Agreement.
Licensee will provide Licensor with insurance certificates evidencing the required coverage within **** after the Effective Date and the commencement of each policy period and any renewal periods. Each certificate will provide that the insurance
carrier will notify Licensor in writing at least **** prior to the cancellation or material change in coverage. Licensee will cause all Sublicensees to comply with the terms of this Section 8.5 to the same extent as Licensee. 

  
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 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 ARTICLE 9: USE OF NAME 

Licensee, its Affiliates, any Sublicensees, and all of its and their employees and agents must not use Licensor’s, the University of Pennsylvania’s,
or SmithKline Beecham Corporation’s name, seal, logo, trademark, or service mark (or any adaptation thereof) or the name, seal, logo, trademark, or service mark (or any adaptation thereof) of any of such entities’ representative, school,
organization, employee, or student in any way without the prior written consent of Licensor or such entity, as applicable; provided, however that Licensee may acknowledge the existence and general nature of this Agreement. 

ARTICLE 10: ADDITIONAL PROVISIONS 
 10.1
Relationship. Nothing in this Agreement shall be deemed to establish a relationship of principal and agent between Licensee and Licensor, nor any of their agents or employees for any purpose whatsoever, nor shall this Agreement be construed
as creating any other form of legal association or arrangement which would impose liability upon one Party for the act or failure to act of the other Party. 

10.2 Assignment. The rights and obligations of Licensee and Licensor hereunder shall inure to the benefit of, and shall be binding upon, their
respective permitted successors and assigns. Licensee may not assign this Agreement or any of its rights or obligations under this Agreement without the prior written consent of Licensor; provided, however, that Licensee may assign this Agreement,
without Licensor’s prior written consent, pursuant to a merger or sale of all or substantially all of the assets to which the Agreement relates; provided that, as part of any permitted assignment, (a) Licensee provides Licensor with notice
of such assignment at least five business days prior to the effectiveness of such assignment, and (b) Licensee requires any such assignee to agree in writing to be legally bound by this Agreement to the same extent as Licensee and provides
Licensor with a copy of such assignee undertaking. In addition, Licensee will provide Licensor with notice of any change of control (i.e., the acquisition by a person or group of “control” of Licensee, as defined in Section 1.1) of
Licensee at least five business days prior to the effectiveness of such change of control. Licensor may assign this Agreement and its rights and obligations without the consent of Licensee. No assignment shall relieve the assigning Party of
responsibility for the performance of any accrued obligations which it has prior to such assignment. Any attempted assignment by Licensee in violation of this Section 10.2 shall be null and void and of no legal effect. 

10.3 Waiver. A waiver by either Party of a breach of any provision of this Agreement will not constitute a waiver of any subsequent breach of that
provision or a waiver of any breach of any other provision of this Agreement. 
 10.4 Notices. Notices, payments, statements, reports, and other
communications under this Agreement shall be in writing and shall be deemed to have been received as of the date received if sent by public courier (e.g., Federal Express), by Express Mail, receipt requested, or by facsimile (with a copy of
such facsimile also sent by one of the other methods of delivery) and addressed as follows: 

  
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 CONFIDENTIAL TREATMENT REQUESTED 

 
  

							
	If for Licensor:		with a copy to:
				
			 ReGenX Biosciences, LLC
 750 17th Street, NW

Suite 1100
 Washington, DC 20006

USA
 Attn: Chief Executive Officer

Telephone: 202-785-7438
 Facsimile: 202-785-7439
				 ReGenX Biosciences, LLC
 750 17th Street,
NW
 Suite 1100
 Washington, DC 20006

USA
 Attn: General Counsel

Telephone: 202-785-7438
 Facsimile: 202-785-7439

			
	If for Licensee:				
				
			 Dimension Therapeutics, Inc.
 1 Main Street, 13th Floor
 Cambridge, MA 02142

USA
 Attn: President and CEO

Telephone: 617-231-2403
 Facsimile: 617-231-2425
				

 Either Party may change its official address upon written notice to the other Party. 

10.5 Applicable Law. This Agreement shall be construed and governed in accordance with the laws of the State of New York, without giving effect to
conflict of law provisions that may require the application of the laws of another jurisdiction. Subject to Section 10.6, the Parties hereby submit to the exclusive jurisdiction of and venue in the courts located in the State of New York with
respect to any and all disputes concerning the subject of this Agreement. 
 10.6 Dispute Resolution. In the event of any controversy or claim
arising out of or relating to this Agreement, the Parties shall first attempt to resolve such controversy or claim through good faith negotiations between senior executives of each Party with authority to resolve the dispute for a period of not less
than **** following notification of such controversy or claim to the other Party. If such controversy or claim cannot be resolved by means of such negotiations during such period, then such controversy or claim shall be resolved by binding
arbitration administered by the American Arbitration Association (“AAA”) in accordance with the Commercial Arbitration Rules of the AAA in effect on the date of commencement of the arbitration, subject to the provisions of this
Section 10.6. The arbitration shall be conducted as follows: 
 10.6.1 The arbitration shall be conducted by three arbitrators, each of
whom by training, education, or experience has knowledge of the research, development, and commercialization of biological therapeutic products in the United States. The arbitration shall be conducted in English and held in New York, New York. 

10.6.2 In its demand for arbitration, the Party initiating the arbitration shall provide a statement setting forth the nature of the dispute,
the names and addresses of all other parties, an estimate of the amount involved (if any), the remedy sought, otherwise specifying the issue to be 

  
 32 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
resolved, and appointing one neutral arbitrator. In an answering statement to be filed by the responding Party within **** after confirmation of the notice of filing of the demand is sent by the
AAA, the responding Party shall appoint one neutral arbitrator. Within **** from the date on which the responding Party appoints its neutral arbitrator, the first two arbitrators shall appoint a chairperson. 

10.6.3 If a Party fails to make the appointment of an arbitrator as provided in Section 10.6.2, the AAA shall make the appointment. If
the appointed arbitrators fail to appoint a chairperson within the time specified in Section 10.6.2 and there is no agreed extension of time, the AAA shall appoint the chairperson. 

10.6.4 The arbitrators will render their award in writing and, unless all Parties agree otherwise, will include an explanation in reasonable
detail of the reasons for their award. Judgment upon the award rendered by the arbitrators may be entered in any court having jurisdiction thereof, including in the courts described in Section 10.5. The arbitrators will have the authority to
grant injunctive relief and other specific performance; provided that the arbitrators will have no authority to award damages in contravention of this Agreement, and each Party irrevocably waives any claim to such damages in contravention of this
Agreement. The arbitrators will, in rendering their decision, apply the substantive law of the State of New York, without giving effect to conflict of law provisions that may require the application of the laws of another jurisdiction. The decision
and award rendered by the arbitrators will be final and non-appealable (except for an alleged act of corruption or fraud on the part of the arbitrator). 

10.6.5 The Parties shall use their reasonable efforts to conduct all dispute resolution procedures under this Agreement as expeditiously,
efficiently, and cost-effectively as possible. 
 10.6.6 All expenses and fees of the arbitrators and expenses for hearing facilities and
other expenses of the arbitration will be borne equally by the Parties unless the Parties agree otherwise or unless the arbitrators in the award assess such expenses against one of the Parties or allocate such expenses other than equally between the
Parties. Each of the Parties will bear its own counsel fees and the expenses of its witnesses except to the extent otherwise provided in this Agreement or by applicable law. 

10.6.7 Compliance with this Section 10.6 is a condition precedent to seeking relief in any court or tribunal in respect of a dispute, but
nothing in this Section 10.6 will prevent a Party from seeking equitable or other interlocutory relief in the courts of appropriate jurisdiction, pending the arbitrators’ determination of the merits of the controversy, if applicable to
protect the confidential information, property, or other rights of that Party or to otherwise prevent irreparable harm that may be caused by the other Party’s actual or threatened breach of this Agreement. 

10.7 No Discrimination. Licensee, its Affiliates, and any Sublicensees, in their respective activities under this Agreement, shall not discriminate
against any employee or applicant for employment because of race, color, sex, sexual, or affectional preference, age, religion, national, or ethnic origin, handicap, or because he or she is a disabled veteran or a veteran (including a veteran of the
Vietnam Era). 

  
 33 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 10.8 Compliance with Law. Licensee (and its Affiliates’ and any
Sublicensees’) must comply with all prevailing laws, rules, and regulations that apply to its activities or obligations under this Agreement. Without limiting the foregoing, it is understood that this Agreement may be subject to United States
laws and regulations controlling the export of technical data, computer software, laboratory prototypes, and other commodities, articles, and information, including the Arms Export Control Act as amended in the Export Administration Act of 1979 and
that Licensee’s obligations are contingent upon compliance with applicable United States export laws and regulations. The transfer of certain technical data and commodities may require a license from the cognizant agency of the United States
Government and/or written assurances by Licensee that Licensee shall not export data or commodities to certain foreign countries without prior approval of such agency. Licensor neither represents that a license is not required nor that, if required,
it will issue. 
 10.9 Entire Agreement. This Agreement embodies the entire understanding between the Parties relating to the subject matter hereof
and supersedes all prior understandings and agreements, whether written or oral. All “Confidential Information” disclosed by Licensor to Fidelity Biosciences Corp. (and then disclosed by Fidelity Biosciences Corp. to Licensee) pursuant to
that certain Confidentiality Agreement dated September 10, 2012 between Licensor and Fidelity Biosciences Corp. or pursuant to any other agreements between them will be deemed “Confidential Information” under this Agreement (unless
and until it falls within one of the exclusions set forth in Section 1.5). This Agreement may not be varied except by a written document signed by duly authorized representatives of both Parties. 

10.10 Marking. Licensee, its Affiliates, and any Sublicensees shall mark any Licensed Product (or their containers or labels) made, sold, or otherwise
distributed by it or them with any notice of patent rights necessary or desirable under applicable law to enable the Licensed Patents to be enforced to their full extent in any country where Licensed Products are made, used, sold, offered for sale,
or imported. 
 10.11 Severability and Reformation. If any provision of this Agreement is held to be invalid or unenforceable by a court of competent
jurisdiction, then such invalid or unenforceable provision will be automatically revised to be a valid or enforceable provision that comes as close as permitted by law to the Parties’ original intent; provided that, if the Parties cannot agree
upon such valid or enforceable provision, the remaining provisions of this Agreement will remain in full force and effect, unless the invalid or unenforceable provisions are of such essential importance to this Agreement that it is to be reasonably
assumed that the Parties would not have entered into this Agreement without the invalid or unenforceable provisions. 
 10.12 Further Assurances.
Each Party hereto agrees to execute, acknowledge, and deliver such further instruments, and to do all other acts, as may be necessary or appropriate in order to carry out the purposes and intent of this Agreement. 

10.13 Interpretation; Construction. The captions to the several Articles and Sections of this Agreement are included only for convenience of reference
and shall not in any way affect the construction of, or be taken into consideration in interpreting, this Agreement. In this Agreement, unless the context requires otherwise, (a) the word “including” shall be deemed to be followed by
the phrase “without limitation” or like expression; (b) references to the singular shall 

  
 34 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 
include the plural and vice versa; (c) references to masculine, feminine, and neuter pronouns and expressions shall be interchangeable; (d) the words “herein” or
“hereunder” relate to this Agreement; (e) “or” is disjunctive but not necessarily exclusive; (f) the word “will” shall be construed to have the same meaning and effect as the word “shall”;
(g) all references to “dollars” or “$” herein shall mean U.S. Dollars; (h) unless otherwise provided, all reference to Sections and exhibits in this Agreement are to Sections and exhibits of and in this Agreement; and
(i) whenever this Agreement refers to a number of days, such number shall refer to calendar days unless business days are specified. Business days shall mean a day on which banking institutions in Washington, D.C. are open for business. Each
Party represents that it has been represented by legal counsel in connection with this Agreement and acknowledges that it has participated in the drafting hereof. In interpreting and applying the terms and provisions of this Agreement, the Parties
agree that no presumption will apply against the Party which drafted such terms and provisions. 
 10.14 Cumulative Rights and Remedies. The rights
and remedies provided in this Agreement and all other rights and remedies available to either Party at law or in equity are, to the extent permitted by law, cumulative and not exclusive of any other right or remedy now or hereafter available at law
or in equity. Neither asserting a right nor employing a remedy shall preclude the concurrent assertion of any other right or employment of any other remedy, nor shall the failure to assert any right or remedy constitute a waiver of that right or
remedy. 
 10.15 Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument. 
 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

  
 35 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 IN WITNESS WHEREOF, the Parties, intending to be legally bound, have
caused this License Agreement to be executed by their duly authorized representatives. 
  

									
	REGENX BIOSCIENCES, LLC				DIMENSION THERAPEUTICS, INC.
					
	By:		 /s/ Kenneth Mills
				By:		 /s/ Don Hayden

	Name:		Kenneth Mills				Name:		Don Hayden
	Title:		President & CEO				Title:		President and CEO

  

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Exhibit A 

Licensed Patents 
  

									
	 App #
	  	 Title
	  	 Inventors
	  	 Nos.
	  	 Penn Docket #

	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****
	 ****
	  	****	  	****	  	****	  	****

  

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Exhibit B 

Licensed Know-How 
 **** 

  

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Exhibit C 

Muscular Dystrophies 
 **** 

  

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Exhibit D 

Disease Indications 
 **** 

 
 ****CERTAIN INFORMATION HAS
BEEN OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 Exhibit E 

Press ReleaseEX-10.19

 Exhibit 10.19 

CONFIDENTIAL TREATMENT REQUESTED 

FIRST AMENDMENT TO LICENSE AGREEMENT 

This FIRST AMENDMENT TO LICENSE AGREEMENT (this “Amendment”) is entered into as of June 18, 2014 (the “Amendment Effective
Date”) by and between ReGenX Biosciences, LLC, a limited liability company organized under the laws of the State of Delaware, with offices at 750 17th Street, NW, Suite 1100, Washington, DC 20006 (“Licensor”), and Dimension
Therapeutics, Inc., a corporation organized under the laws of the State of Delaware, with offices at 1 Main Street, 13th Floor, Cambridge, MA 02142 (“Licensee”). Licensor and Licensee are hereinafter referred to individually as a
“Party” and collectively as the “Parties.” 
 WHEREAS, Licensor and Licensee entered into that certain License Agreement
dated October 30, 2013 (the “Original Agreement”); and 
 WHEREAS, the Parties desire to make certain amendments to the Original Agreement;

 NOW, THEREFORE, in consideration of the promises and covenants contained in this Agreement, and intending to be legally bound, the Parties hereby agree
as follows: 
 1. Definitions. Capitalized terms not defined in this Amendment have the meanings given such terms in the Original Agreement. 

2. Amendments. 
 (a) The introductory
paragraph of Section 3.5.1 of the Original Agreement is hereby amended and restated in its entirety to read as follows: 
 3.5.1
Licensee must deliver to Licensor within **** after the end of each Calendar Quarter after the first commercial sale of a Licensed Product a report setting forth the calculation of the royalties due to Licensor for such Calendar Quarter, including:

 (b) Section 3.5.2 of the Original Agreement is hereby amended and restated in its entirety to read as follows: 

3.5.2 Licensee shall pay the royalties due under Section 3.3 within **** following the last day of the Calendar Quarter in which the
royalties accrue. Licensee shall send the royalty payments along with the report described in Section 3.5.1. 
 (c) Section 4.2 of
the Original Agreement is hereby amended by replacing clause (b) of the milestone chart in such section with the following: 
 (b) ****

 (d) Section 6.3.1 of the Original Agreement is hereby amended and restated in its entirety to read as follows: 

 
 ****CERTAIN INFORMATION HAS
BEEN OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 6.3.1 Licensor may terminate this Agreement, if Licensee is late in
paying to Licensor royalties, fees, or any other monies due under this Agreement, and Licensee does not pay Licensor in full within **** upon written demand from Licensor, which termination shall be effective immediately upon the expiration of such
**** cure period. 
 (e) Section 6.3.2 of the Original Agreement is hereby amended and restated in its entirety to read as follows:

 6.3.2 Either Party may terminate this Agreement, if the other Party materially breaches this Agreement and does not cure such material
breach within 30 days after written notice of the breach, which termination shall be effective immediately upon the expiration of such **** cure period; provided that, if termination is by Licensor as a result of Licensee’s materially breaching
Article 4, ****, but not all, then Licensor’s termination right shall only be with respect to the disease indication with respect to which the breach related and not the remaining disease indications; provided further that, if termination is by
Licensor as a result of Licensee materially breaching Section 3.5.1, such cure period will be **** (in place of ****). 
 (f)
Section 8.5 of the Original Agreement is hereby amended by replacing the last sentence thereof with the following: 
 Licensee will
cause all Sublicensees to comply with the terms of this Section 8.5 to the same extent as Licensee; provided that, with Licensor’s prior written consent, a Sublicensee may self-insure all or parts of the limits described above. 

3. Incorporation. Article 10 of the Original Agreement is hereby incorporated mutatis mutandis into this Amendment. 

4. Effect on Original Agreement. Except as specifically amended by this Amendment, the Original Agreement will remain in full force and effect and is
hereby ratified and confirmed. Each future reference to the Original Agreement will refer to the Original Agreement as amended by this Amendment. To the extent a conflict arises between the terms of the Original Agreement and this Amendment, the
terms of this Amendment shall prevail but only to the extent necessary to accomplish their intended purpose. 

[Remainder of Page Intentionally Left Blank] 

  
 2 

 ****CERTAIN INFORMATION HAS BEEN
OMITTED AND FILED SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS. 

 CONFIDENTIAL TREATMENT REQUESTED 

 
 IN WITNESS WHEREOF, the Parties, intending to be legally bound, have
caused this First Amendment to License Agreement to be executed by their duly authorized representatives. 
  

									
	REGENX BIOSCIENCES, LLC				DIMENSION THERAPEUTICS, INC.
					
	By:		 /s/ Kenneth Mills
				By:		 /s/ Thomas R. Beck

	Name:		Kenneth Mills				Name:		Thomas R. Beck
	Title:		President & CEO				Title:		President & CEO

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