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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): November 3, 2026

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PTC THERAPEUTICS, INC.

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(Exact Name of Company as Specified in Charter)

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Delaware

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001-35969

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04-3416587

(State or Other Jurisdiction

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(Commission

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(IRS Employer

of Incorporation)

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File Number)

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Identification No.)

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500 Warren Corporate Center Drive

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Warren, NJ

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07059

(Address of Principal Executive Offices)

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(Zip Code)

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

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Not applicable

(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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Title of each class

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Trading Symbol(s)

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Name of each exchange on which registered

Common Stock, $0.001 par value per share

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PTCT

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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).

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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 7.01. Regulation FD Disclosure.

On November 3, 2026, PTC Therapeutics, Inc. (the “Company”) issued a press release announcing that its Board of Directors (the “Board”) authorized a share repurchase program. The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”) and is incorporated by reference into this Item 7.01.

The information in this Item 7.01, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. All website addresses given in this Report or incorporated herein by reference are for information only and are not intended to be an active link or to incorporate any website information into this Report.

Item 8.01. Other Information.

On November 3, 2026, the Company issued a press release announcing that its Board authorized a share repurchase program under which the Company may repurchase up to $500.0 million of the Company’s common stock, par value $0.001 per share (the “Common Stock”).

Share repurchases may be made from time to time at management's discretion through a variety of methods, such as open-market transactions including pre-set trading plans, privately negotiated transactions, accelerated share repurchases, and other transactions in accordance with applicable securities laws.

Information regarding any share repurchases will be available in the Company’s periodic reports on Form 10-Q and Form 10-K filed with the Securities and Exchange Commission as required by the applicable rules of the Exchange Act.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

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Exhibit No.

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Description

99.1

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Press Release, dated November 3, 2026 issued by PTC Therapeutics, Inc.

104

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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.

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Date: November 3, 2026

By:

/s/ Pierre Gravier

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Name: 

Pierre Gravier

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Title:

Chief Financial Officer

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ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EX-99.1

EX-101.SCH

EX-101.DEF

EX-101.LAB

EX-101.PRE

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