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UNITED STATES

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SECURITIES AND EXCHANGE COMMISSION

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WASHINGTON, D.C. 20549

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FORM 8-K

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CURRENT REPORT

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

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Date of Report (Date of earliest event reported): October 19, 2023

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PTC THERAPEUTICS, INC.

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(Exact Name of Company as Specified in Charter)

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

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Not applicable

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

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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):

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

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

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

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

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

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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).

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Emerging growth company ☐

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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 1.02. Termination of a Material Definitive Agreement.

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On October 19, 2023, the Company terminated the Credit Agreement, dated October 27, 2022, by and among the Company, as the borrower, each subsidiary of the Company from time to time party thereto, as guarantors, the lenders from time to time party thereto and Wilmington Trust National Association, as administrative agent (the "Credit Agreement"). In connection with the termination of the Credit Agreement, the Company repaid outstanding principal and accrued interest thereunder totaling $302.1 million and paid an additional $82.1 million in prepayment premiums, expenses and other exit fees. All liens and security interests securing the loans made pursuant to the Credit Agreement were released upon termination.

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Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

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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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