# EDGAR Filing Document

**Accession Number:** 0001070081
**File Stem:** 0001104659-26-071916
**Filing Date:** 2026-6
**Character Count:** 39706
**Document Hash:** bb17b1526cab86587b4d10da383fa236
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-071916.hdr.sgml**: 20260609

**ACCESSION NUMBER**: 0001104659-26-071916

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260608

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260609

**DATE AS OF CHANGE**: 20260609

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PTC THERAPEUTICS, INC.
- **CENTRAL INDEX KEY:** 0001070081
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 043416587
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35969
- **FILM NUMBER:** 261077122

**BUSINESS ADDRESS:**
- **STREET 1:** 500 WARREN CORPORATE CENTER DRIVE
- **CITY:** WARREN
- **STATE:** NJ
- **ZIP:** 07059
- **BUSINESS PHONE:** 9082227000

**MAIL ADDRESS:**
- **STREET 1:** 500 WARREN CORPORATE CENTER DRIVE
- **CITY:** WARREN
- **STATE:** NJ
- **ZIP:** 07059

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PTC THERAPEUTICS INC
- **DATE OF NAME CHANGE:** 19980909

?xml version='1.0' encoding='ASCII'? PTC THERAPEUTICS, INC._June 8, 2026

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): **June 8, 2026**

**PTC THERAPEUTICS, INC.**

(Exact Name of Company as Specified in Charter)

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| | | |
|:---|:---|:---|
| **Delaware** | **001-35969** | **04-3416587** |
| (State or Other Jurisdiction | (Commission | (IRS Employer |
| of Incorporation) | File Number) | Identification No.) |

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| | |
|:---|:---|
| **500 Warren Corporate Center Drive** |  |
| **Warren, NJ** | **07059** |
| (Address of Principal Executive Offices) | (Zip Code) |

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Registrant's telephone number, including area code: **(908) 222-7000**

**Not applicable**

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (*see* General Instruction A.2. below):

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

**Securities registered pursuant to Section 12(b) of the Act:**

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock, $0.001 par value per share | PTCT | Nasdaq Global Select Market |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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**Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

On June 8, 2026, Alethia Young, a member of the board of directors (the "Board") of PTC Therapeutics, Inc. (the "Company"), notified the Company of her resignation from the Board effective June 8, 2026. Ms. Young has informed the Company that her decision is based on her need to focus on commitments to her other work activities and was not due to any disagreement with the Company.

The Company and Ms. Young entered into a consulting agreement effective as of June 8, 2026 (the "Consulting Agreement") pursuant to which Ms. Young will remain as an advisor to the Company, with a term continuing through June 8, 2027. Pursuant to the Consulting Agreement, Ms. Young will receive a monthly consulting fee of $4,166.67.

The foregoing description of the Consulting Agreement is qualified in its entirety by reference to the full text of the Consulting Agreement, a copy of which is attached hereto as Exhibit 10.1 and incorporated herein by reference.

**Item 9.01. Financial Statements and Exhibits.**

(d) Exhibits

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 10.1 | [Consulting Services Agreement between the Registrant and Alethia Young](tmb-20260608xex10d1.htm) |
| 104 | The cover page from this Current Report on Form 8-K, formatted in Inline XBRL |

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**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | |
|:---|:---|:---|
|  | **PTC Therapeutics, Inc.** | **PTC Therapeutics, Inc.** |
| Date: June 9, 2026 | By: | /s/ Pierre Gravier |
|  | Name: | Pierre Gravier |
|  | Title: | Chief Financial Officer |

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## Exhibit 10.1

**Exhibit 10.1**

PTC CONSULTING SERVICES AGREEMENT<br>

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| | |
|:---|:---|
| This Consulting Services Agreement, effective as June 8, 2026 (the "Effective Date") between PTC Therapeutics, Inc., a Delaware corporation ("PTC" or the "Company") and Alethia Young (the "Consultant").<br>WHEREAS, the Consultant has served as a member of the Board of Directors of PTC (the "Board"), and in such capacity has participated in the oversight of PTC and its activities, until her resignation from the Board effective as of the Effective Date;<br>WHEREAS, the purpose of this Agreement is to confirm the parties' understanding with respect to (i) Consultant's rendering consulting services to PTC in exchange for the consideration as further described in this Agreement, and (ii) various related matters, including without limitation Consultant's obligations to protect information and property which is confidential and proprietary to PTC and its affiliated entities.<br>NOW THEREFORE, PTC and Consultant agree as follows:<br>**SERVICES AND NATURE OF ENGAGMENT**<br>*Services*. Consultant shall perform advisory services for PTC, its management and/or the Board, as reasonably requested from time to time (the "Services"). Consultant shall also provide such other Services as the parties may mutually agree. Consultant represents that she is capable of properly performing the Services.<br>*Independent Contractor Status*. The Consultant understands and agrees that she is engaged herein as an independent contractor, and not an employee of the Company. The Consultant shall retain control over the manner and method by which she provides the Services and shall not be subject to the control or direction of the Company, except that the Company may specify the general services that the Company engages Consultant to perform.<br>*No Employment Relationship*. Nothing in this Agreement shall create any contract or relationship of employment between the Consultant and the Company or render the Consultant an employee of the Company. The Consultant shall be deemed an independent contractor and not an employee of the Company for all purposes, including all federal/national, state/regional and local laws pertaining to income taxes, withholding taxes, social security, unemployment compensation, workers | compensation/employers' liability or any other rights, benefits, or obligations relating to employment. The Consultant specifically understands and agrees that she: (i) shall not receive a salary or any health, welfare, or other benefits provided by the Company to its employees; (ii) is not entitled to submit any claim for injury or illness either directly to the Company or under any workers' compensation/employers' liability coverage maintained by the Company; and (iii) shall, in relation to the Services rendered pursuant to this Agreement, receive an IRS Form 1099 (or equivalent) from the Company with respect to his compensation for the Services, and it shall be the Consultant's sole responsibility to report and to pay all applicable income taxes on all payments made to the Consultant by the Company under this Agreement, and the Company shall not withhold any taxes except to the extent required by applicable law. PTC will ensure that Consultant is covered by its applicable insurance polic(ies) to the same extent as when she was a Director for any similar activities she will engage in as a Consultant, except for workers compensation/employers' liability coverage or any other policies which do not apply to consultants. The Consultant shall not, at any time, represent to others that she is, nor will she hold herself out to be, an employee of the Company. The Consultant is not authorized to bind the Company or to incur any obligation or liability on behalf of the Company.<br>**COMPENSATION**<br>PTC shall pay Consultant a monthly rate of $4,166.67 for services rendered.<br>Consultant shall send all invoices for Services via email to accountspayable@ptcbio.com, sguzman@ptcbio.com and mboulding@ptcbio.com. Such invoices shall contain a general description of the Services performed, the dates of performance, and the hours spent performing the Services.<br>In addition, the outstanding equity rights/awards issued/granted to Consultant prior to the Effective Date based on her prior services as a member of the Board shall be treated as set forth on <u>Schedule A</u> hereto.<br>In addition to the foregoing amount, PTC shall pay Consultant for (i) all reasonable and necessary travel expenses (other than ordinary commuting expenses) incurred by Consultant at the prior request of PTC in providing the Services, and (ii) other expenses pre-approved in writing by an authorized PTC representative that are necessary to performance of the Services. Payment for such expenses shall be made to Consultant within 45 days of receipt by PTC of invoices and receipts substantiating such expenses and detailing the Services to which they relate, and PTC shall then have no further obligation to Consultant for such expenses.<br>Consultant shall keep or cause to be kept full, timely and accurate records in reasonable form and detail and to which PTC and its designated employees, agents or representatives shall have access at any reasonable time for auditing purposes. When requested by PTC, Consultant shall be required to report on the status of his work on the Services in a manner satisfactory to PTC. |
| This Consulting Services Agreement, effective as June 8, 2026 (the "Effective Date") between PTC Therapeutics, Inc., a Delaware corporation ("PTC" or the "Company") and Alethia Young (the "Consultant").<br>WHEREAS, the Consultant has served as a member of the Board of Directors of PTC (the "Board"), and in such capacity has participated in the oversight of PTC and its activities, until her resignation from the Board effective as of the Effective Date;<br>WHEREAS, the purpose of this Agreement is to confirm the parties' understanding with respect to (i) Consultant's rendering consulting services to PTC in exchange for the consideration as further described in this Agreement, and (ii) various related matters, including without limitation Consultant's obligations to protect information and property which is confidential and proprietary to PTC and its affiliated entities.<br>NOW THEREFORE, PTC and Consultant agree as follows:<br>**SERVICES AND NATURE OF ENGAGMENT**<br>*Services*. Consultant shall perform advisory services for PTC, its management and/or the Board, as reasonably requested from time to time (the "Services"). Consultant shall also provide such other Services as the parties may mutually agree. Consultant represents that she is capable of properly performing the Services.<br>*Independent Contractor Status*. The Consultant understands and agrees that she is engaged herein as an independent contractor, and not an employee of the Company. The Consultant shall retain control over the manner and method by which she provides the Services and shall not be subject to the control or direction of the Company, except that the Company may specify the general services that the Company engages Consultant to perform.<br>*No Employment Relationship*. Nothing in this Agreement shall create any contract or relationship of employment between the Consultant and the Company or render the Consultant an employee of the Company. The Consultant shall be deemed an independent contractor and not an employee of the Company for all purposes, including all federal/national, state/regional and local laws pertaining to income taxes, withholding taxes, social security, unemployment compensation, workers | compensation/employers' liability or any other rights, benefits, or obligations relating to employment. The Consultant specifically understands and agrees that she: (i) shall not receive a salary or any health, welfare, or other benefits provided by the Company to its employees; (ii) is not entitled to submit any claim for injury or illness either directly to the Company or under any workers' compensation/employers' liability coverage maintained by the Company; and (iii) shall, in relation to the Services rendered pursuant to this Agreement, receive an IRS Form 1099 (or equivalent) from the Company with respect to his compensation for the Services, and it shall be the Consultant's sole responsibility to report and to pay all applicable income taxes on all payments made to the Consultant by the Company under this Agreement, and the Company shall not withhold any taxes except to the extent required by applicable law. PTC will ensure that Consultant is covered by its applicable insurance polic(ies) to the same extent as when she was a Director for any similar activities she will engage in as a Consultant, except for workers compensation/employers' liability coverage or any other policies which do not apply to consultants. The Consultant shall not, at any time, represent to others that she is, nor will she hold herself out to be, an employee of the Company. The Consultant is not authorized to bind the Company or to incur any obligation or liability on behalf of the Company.<br>**COMPENSATION**<br>PTC shall pay Consultant a monthly rate of $4,166.67 for services rendered.<br>Consultant shall send all invoices for Services via email to accountspayable@ptcbio.com, sguzman@ptcbio.com and mboulding@ptcbio.com. Such invoices shall contain a general description of the Services performed, the dates of performance, and the hours spent performing the Services.<br>In addition, the outstanding equity rights/awards issued/granted to Consultant prior to the Effective Date based on her prior services as a member of the Board shall be treated as set forth on <u>Schedule A</u> hereto.<br>In addition to the foregoing amount, PTC shall pay Consultant for (i) all reasonable and necessary travel expenses (other than ordinary commuting expenses) incurred by Consultant at the prior request of PTC in providing the Services, and (ii) other expenses pre-approved in writing by an authorized PTC representative that are necessary to performance of the Services. Payment for such expenses shall be made to Consultant within 45 days of receipt by PTC of invoices and receipts substantiating such expenses and detailing the Services to which they relate, and PTC shall then have no further obligation to Consultant for such expenses.<br>Consultant shall keep or cause to be kept full, timely and accurate records in reasonable form and detail and to which PTC and its designated employees, agents or representatives shall have access at any reasonable time for auditing purposes. When requested by PTC, Consultant shall be required to report on the status of his work on the Services in a manner satisfactory to PTC. |
| This Consulting Services Agreement, effective as June 8, 2026 (the "Effective Date") between PTC Therapeutics, Inc., a Delaware corporation ("PTC" or the "Company") and Alethia Young (the "Consultant").<br>WHEREAS, the Consultant has served as a member of the Board of Directors of PTC (the "Board"), and in such capacity has participated in the oversight of PTC and its activities, until her resignation from the Board effective as of the Effective Date;<br>WHEREAS, the purpose of this Agreement is to confirm the parties' understanding with respect to (i) Consultant's rendering consulting services to PTC in exchange for the consideration as further described in this Agreement, and (ii) various related matters, including without limitation Consultant's obligations to protect information and property which is confidential and proprietary to PTC and its affiliated entities.<br>NOW THEREFORE, PTC and Consultant agree as follows:<br>**SERVICES AND NATURE OF ENGAGMENT**<br>*Services*. Consultant shall perform advisory services for PTC, its management and/or the Board, as reasonably requested from time to time (the "Services"). Consultant shall also provide such other Services as the parties may mutually agree. Consultant represents that she is capable of properly performing the Services.<br>*Independent Contractor Status*. The Consultant understands and agrees that she is engaged herein as an independent contractor, and not an employee of the Company. The Consultant shall retain control over the manner and method by which she provides the Services and shall not be subject to the control or direction of the Company, except that the Company may specify the general services that the Company engages Consultant to perform.<br>*No Employment Relationship*. Nothing in this Agreement shall create any contract or relationship of employment between the Consultant and the Company or render the Consultant an employee of the Company. The Consultant shall be deemed an independent contractor and not an employee of the Company for all purposes, including all federal/national, state/regional and local laws pertaining to income taxes, withholding taxes, social security, unemployment compensation, workers | compensation/employers' liability or any other rights, benefits, or obligations relating to employment. The Consultant specifically understands and agrees that she: (i) shall not receive a salary or any health, welfare, or other benefits provided by the Company to its employees; (ii) is not entitled to submit any claim for injury or illness either directly to the Company or under any workers' compensation/employers' liability coverage maintained by the Company; and (iii) shall, in relation to the Services rendered pursuant to this Agreement, receive an IRS Form 1099 (or equivalent) from the Company with respect to his compensation for the Services, and it shall be the Consultant's sole responsibility to report and to pay all applicable income taxes on all payments made to the Consultant by the Company under this Agreement, and the Company shall not withhold any taxes except to the extent required by applicable law. PTC will ensure that Consultant is covered by its applicable insurance polic(ies) to the same extent as when she was a Director for any similar activities she will engage in as a Consultant, except for workers compensation/employers' liability coverage or any other policies which do not apply to consultants. The Consultant shall not, at any time, represent to others that she is, nor will she hold herself out to be, an employee of the Company. The Consultant is not authorized to bind the Company or to incur any obligation or liability on behalf of the Company.<br>**COMPENSATION**<br>PTC shall pay Consultant a monthly rate of $4,166.67 for services rendered.<br>Consultant shall send all invoices for Services via email to accountspayable@ptcbio.com, sguzman@ptcbio.com and mboulding@ptcbio.com. Such invoices shall contain a general description of the Services performed, the dates of performance, and the hours spent performing the Services.<br>In addition, the outstanding equity rights/awards issued/granted to Consultant prior to the Effective Date based on her prior services as a member of the Board shall be treated as set forth on <u>Schedule A</u> hereto.<br>In addition to the foregoing amount, PTC shall pay Consultant for (i) all reasonable and necessary travel expenses (other than ordinary commuting expenses) incurred by Consultant at the prior request of PTC in providing the Services, and (ii) other expenses pre-approved in writing by an authorized PTC representative that are necessary to performance of the Services. Payment for such expenses shall be made to Consultant within 45 days of receipt by PTC of invoices and receipts substantiating such expenses and detailing the Services to which they relate, and PTC shall then have no further obligation to Consultant for such expenses.<br>Consultant shall keep or cause to be kept full, timely and accurate records in reasonable form and detail and to which PTC and its designated employees, agents or representatives shall have access at any reasonable time for auditing purposes. When requested by PTC, Consultant shall be required to report on the status of his work on the Services in a manner satisfactory to PTC. |
| This Consulting Services Agreement, effective as June 8, 2026 (the "Effective Date") between PTC Therapeutics, Inc., a Delaware corporation ("PTC" or the "Company") and Alethia Young (the "Consultant").<br>WHEREAS, the Consultant has served as a member of the Board of Directors of PTC (the "Board"), and in such capacity has participated in the oversight of PTC and its activities, until her resignation from the Board effective as of the Effective Date;<br>WHEREAS, the purpose of this Agreement is to confirm the parties' understanding with respect to (i) Consultant's rendering consulting services to PTC in exchange for the consideration as further described in this Agreement, and (ii) various related matters, including without limitation Consultant's obligations to protect information and property which is confidential and proprietary to PTC and its affiliated entities.<br>NOW THEREFORE, PTC and Consultant agree as follows:<br>**SERVICES AND NATURE OF ENGAGMENT**<br>*Services*. Consultant shall perform advisory services for PTC, its management and/or the Board, as reasonably requested from time to time (the "Services"). Consultant shall also provide such other Services as the parties may mutually agree. Consultant represents that she is capable of properly performing the Services.<br>*Independent Contractor Status*. The Consultant understands and agrees that she is engaged herein as an independent contractor, and not an employee of the Company. The Consultant shall retain control over the manner and method by which she provides the Services and shall not be subject to the control or direction of the Company, except that the Company may specify the general services that the Company engages Consultant to perform.<br>*No Employment Relationship*. Nothing in this Agreement shall create any contract or relationship of employment between the Consultant and the Company or render the Consultant an employee of the Company. The Consultant shall be deemed an independent contractor and not an employee of the Company for all purposes, including all federal/national, state/regional and local laws pertaining to income taxes, withholding taxes, social security, unemployment compensation, workers | compensation/employers' liability or any other rights, benefits, or obligations relating to employment. The Consultant specifically understands and agrees that she: (i) shall not receive a salary or any health, welfare, or other benefits provided by the Company to its employees; (ii) is not entitled to submit any claim for injury or illness either directly to the Company or under any workers' compensation/employers' liability coverage maintained by the Company; and (iii) shall, in relation to the Services rendered pursuant to this Agreement, receive an IRS Form 1099 (or equivalent) from the Company with respect to his compensation for the Services, and it shall be the Consultant's sole responsibility to report and to pay all applicable income taxes on all payments made to the Consultant by the Company under this Agreement, and the Company shall not withhold any taxes except to the extent required by applicable law. PTC will ensure that Consultant is covered by its applicable insurance polic(ies) to the same extent as when she was a Director for any similar activities she will engage in as a Consultant, except for workers compensation/employers' liability coverage or any other policies which do not apply to consultants. The Consultant shall not, at any time, represent to others that she is, nor will she hold herself out to be, an employee of the Company. The Consultant is not authorized to bind the Company or to incur any obligation or liability on behalf of the Company.<br>**COMPENSATION**<br>PTC shall pay Consultant a monthly rate of $4,166.67 for services rendered.<br>Consultant shall send all invoices for Services via email to accountspayable@ptcbio.com, sguzman@ptcbio.com and mboulding@ptcbio.com. Such invoices shall contain a general description of the Services performed, the dates of performance, and the hours spent performing the Services.<br>In addition, the outstanding equity rights/awards issued/granted to Consultant prior to the Effective Date based on her prior services as a member of the Board shall be treated as set forth on <u>Schedule A</u> hereto.<br>In addition to the foregoing amount, PTC shall pay Consultant for (i) all reasonable and necessary travel expenses (other than ordinary commuting expenses) incurred by Consultant at the prior request of PTC in providing the Services, and (ii) other expenses pre-approved in writing by an authorized PTC representative that are necessary to performance of the Services. Payment for such expenses shall be made to Consultant within 45 days of receipt by PTC of invoices and receipts substantiating such expenses and detailing the Services to which they relate, and PTC shall then have no further obligation to Consultant for such expenses.<br>Consultant shall keep or cause to be kept full, timely and accurate records in reasonable form and detail and to which PTC and its designated employees, agents or representatives shall have access at any reasonable time for auditing purposes. When requested by PTC, Consultant shall be required to report on the status of his work on the Services in a manner satisfactory to PTC. |

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| | |
|:---|:---|
| *PTC Services Agreement* | *Confidential* |
| **NO CONFLICTS** | **INTELLECTUAL PROPERTY** |
| <br>Throughout the term of this Agreement the parties hereto agree that the type of services to be rendered hereunder by Consultant are not exclusive to PTC. Consultant, during the term of this Agreement, may accept from others, concurrent consulting work provided that such consulting work does not in any way interfere with the Services Consultant is required to perform under this Agreement and is not a breach of any of Consultant's obligations under this Agreement. Notwithstanding the foregoing, Consultant represents that (i) she has not, and will not during the term of this Agreement, enter into any agreement or relationship that would interfere with or prevent his performance under this Agreement, (ii) by entering into and performing this Agreement, she is not and will not be violating any agreement or arrangement with any third parties, and (iii) that during the term of this Agreement she will not solicit or divert business, customers or employees of PTC on behalf of Consultant, herself or any other business.<br>**CONFIDENTIALITY**<br>(a)In providing consulting services to PTC pursuant to this Agreement, Consultant may have continued access to or acquire PTC's confidential or proprietary information, including without limitation information that pertains to PTC's products, processes, equipment, programs, development efforts, therapeutic targets, compounds, assays, know-how, or plans ("Proprietary Information"). Consultant agrees not to disclose any Proprietary Information to third parties or to use any Proprietary Information for any purpose other than performance of the Services.<br>(b) Proprietary Information subject to the foregoing paragraph does not include information Consultant can demonstrate: (i) is or later becomes available to the public through no breach of this Agreement by Consultant; (ii) is obtained by Consultant from a third party who Consultant had a commercially reasonable basis to believe had the legal right to disclose the information to Consultant; (iii) is already in the possession of Consultant on the Effective Date (not as a result of Consultant's prior services as a member of the Board); or (iv) is required to be disclosed by law, government regulation, or court order; provided, however, that Consultant shall use his best efforts to provide PTC with notice and an opportunity to oppose or limit such disclosure.<br>(c) Consultant shall not disclose to PTC any confidential information of other parties without the prior written consent of PTC.<br>(d) Consultant agrees to promptly return, upon request by PTC, all materials in Consultant's possession that were either (i) supplied by PTC or its representatives in conjunction with the Services or his prior services as a member of the Board, or (ii) generated by Consultant in the performance of the Services and contain or reference Proprietary Information. This obligation of return of materials is in addition to, and shall not be construed to limit, any deliverables with respect to the Services. | <br>Consultant hereby assigns to PTC any right, title, and interest Consultant may have in any know-how, invention, discovery, improvement, or other intellectual property which Consultant develops during the course of and as a direct result of performing the Services. Any intellectual property assignable to PTC pursuant to the preceding sentence is hereinafter referred to as "PTC Intellectual Property". Upon the request of PTC, Consultant shall (i) provide such documentation relating to any PTC Intellectual Property, and (ii) execute such further assignments, documents, and other instruments, as may be necessary to assign PTC Intellectual Property to PTC and to assist PTC in applying for, obtaining and enforcing patents or other rights in the United States and in any foreign country with respect to any PTC Intellectual Property. PTC will bear the cost of preparation of all patent or other applications and assignments, and the cost of obtaining and enforcing all patents and other rights to PTC Intellectual Property. Consultant hereby designates PTC as agent, and grants to PTC a power of attorney with full power of substitution, for the purpose of effecting the foregoing assignments. Consultant agrees not to publish any PTC Intellectual Property without the prior written consent of PTC.<br>**INDEMIFICATION**<br>PTC will indemnify Consultant against all damages, losses and reasonable costs (including reasonable attorneys' fees) incurred or sustained by Consultant in connection with any action, suit or proceeding to which she may be made a party by reason of his performance of Services under this Agreement, except to the extent arising from Consultant's gross negligence, willful misconduct or breach of this Agreement.<br>**TERM AND TERMINATION**<br>(a) Unless terminated earlier pursuant to the following paragraphs, this Agreement shall terminate on June 8, 2027 (the Effective Date through such termination date being the "Term"), *provided that*, either party may elect to terminate this Agreement at any time on thirty (30) days written notice. The parties may extend the Term by mutual written agreement.<br>(b) PTC may terminate this Agreement on written notice in the case of a material breach by Consultant of any obligation hereunder.<br>(c) Termination of this Agreement under this section shall not affect (i) PTC's obligation to pay for Services previously performed by Consultant or expenses reasonably incurred by Consultant for which Consultant is entitled to reimbursement under this Agreement, (ii) the Indemnification section of this Agreement, or (iii) Consultant's continuing obligations to PTC under the Confidentiality, Intellectual Property, Term and Termination, and Miscellaneous sections of this Agreement. However, Consultant shall not be entitled to any |

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|:---|
| *PTC Services Agreement* |
| continuing compensation of any nature following termination. |

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| | |
|:---|:---|
| *PTC Services Agreement* | *Confidential* |
| (j) Notwithstanding the foregoing, and notwithstanding the termination of Consultant's employment with PTC, Consultant shall continue to comply with any post-employment covenants to PTC under any confidentiality / assignment of inventions agreement between the parties.<br>(k) If any term or provision of this Agreement is deemed invalid, contrary to, or prohibited under applicable laws or regulations of any jurisdiction, the remainder of this Agreement shall remain in effect, and the relevant term or provision shall be limited to the maximum permissible extent.<br>IN WITNESS WHEREOF, the parties have executed this Agreement effective as of the Effective Date. |  |
| **CONSULTANT:** |  |
| /s/ Alethia Young |  |
| **Alethia Young** |  |
| Date: June 8, 2026 |  |
| **PTC THERAPEUTICS, INC.** |  |
| /s/ Mark Boulding |  |
| Name: Mark Boulding |  |
| Title: EVP & Chief Legal Officer |  |
| Date: June 8, 2026 |  |

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**Schedule A**

**EQUITY RIGHTS / AWARDS**

**as of June 8, 2026**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**A.** **Stock Options Granted:** 

**Complete List of Stock Options Granted ("Stock Options Granted") and their Vesting Treatment**:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) stock options to purchase 3,475 shares granted on January 2, 2026 with an exercise price of $76.74 per share, of which 1,447 have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) stock options to purchase 8,800 shares granted on January 3, 2025 with an exercise price of $46.54 per share, 100% of which have vested but remain unexercised.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) stock options to purchase 10,000 shares granted on February 15, 2024 with an exercise price of $25.69 per share, 100% of which have vested but remain unexercised.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) stock options to purchase 10,000 shares granted on January 4, 2023 with an exercise price of $39.42 per share, 100% of which have vested but remain unexercised.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) stock options to purchase 7,000 shares granted on June 9, 2022 with an exercise price of $27.85 per share, 100% of which have vested and all have been exercised.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) stock options to purchase 12,000 shares granted on June 9, 2022 with an exercise price of $27.85 per share, 100% of which have vested and 7,334 remain unexercised.

**Exercisability of Stock Options Granted:**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)  ***vesting*** 

During the term of this Agreement, consistent with and subject to the terms of the applicable stock option agreement/certificate and related documentation, any of the unvested portion of the Stock Options Granted, except (if applicable) any Stock Options cancelled per the terms above, will continue to vest according to the vesting schedule in the applicable stock option agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)  ***exercise period*** :

During the term and until three (3) years immediately following termination of this Agreement, consistent with and subject to the terms of the applicable stock option agreement/certificate and related documentation, Consultant shall have the right to exercise the vested portion of the Stock Options Granted, except (if applicable) any Stock Options cancelled per the terms above; provided, however, that in no event may Consultant exercise any such options beyond the date that is ten (10) years from the initial grant date of any such options as set forth in the applicable option agreement or certificate.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)  ***withholding obligations*** :

When and if Consultant exercises any Stock Options, PTC shall require her to satisfy any applicable income and employment tax withholding obligations prior to PTC's issuance of any shares with respect to the options.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**B.** **Restricted Stop Units (RSUs) Granted** 

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**Complete List of Restricted Stock Units ("RSUs Granted") and their Vesting Treatment**:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) 4,000 restricted stock units granted on January 2, 2026, 1,667 of which have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) 4,000 restricted stock units granted on January 3, 2025, 100% of which have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) 4,000 restricted stock units granted on February 15, 2024, 100% of which have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) 4,000 restricted stock units granted on January 5, 2023, 100% of which have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) 3,200 restricted stock units granted on June 9, 2022, 100% of which have vested.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) 1,867 restricted stock units granted on June 9, 2022, 100% of which have vested.

**Continued Vesting of Restricted Stock Units Granted:**

During the term of this Agreement, consistent with and subject to the terms of the applicable restricted stock unit agreement/certificate and related documentation, any of the unvested portion of the RSUs Granted, except (if applicable) any Restricted Stock Unites cancelled per the terms above, will continue to vest according to the vesting schedule in the applicable restricted stock unit agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**C.** **Certification of Insider Trading Policy:** 

Consultant has or will read and execute PTC's current "Consultant Certification Regarding Insider Trading Policy".

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