PTC Therapeutics officer proposes $27.9K share sale

Mark Boulding's notice also lists prior sales of 5,079, 2,813 and 1,638 shares between July 6 and October 5, 2026.

Rhea-AI Filing Summary

PTC Therapeutics, Inc. officer Mark Boulding gave notice of a proposed sale of 435 common shares, with an aggregate market value of $27,907.59 and an approximate sale date of October 6, 2026. The notice identifies Fidelity Brokerage Services LLC as broker and lists the shares as acquired from the issuer through a stock option exercise for cash.

Key Figures

Proposed shares to be sold: 435 shares Aggregate market value: $27,907.59 Prior sale shares: 5,079 shares +5 more

8 metrics

Proposed shares to be sold 435 shares Approximate sale date: October 6, 2026

Aggregate market value $27,907.59 Proposed sale of 435 common shares

Prior sale shares 5,079 shares July 6, 2026

Reported dollar amount for prior sale $432,115.62 July 6, 2026

Prior sale shares 2,813 shares August 17, 2026

Reported dollar amount for prior sale $204,123.09 August 17, 2026

Prior sale shares 1,638 shares October 5, 2026

Reported dollar amount for prior sale $104,883.43 October 5, 2026

Key Terms

Rule 144, Stock Option Exercise, attorney-in-fact

3 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Option Exercise financial

"Nature of acquisition: Stock Option Exercise"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

attorney-in-fact regulatory

"as attorney-in-fact for Mark Boulding"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How were the 435 PTCT shares to be sold acquired?

The notice lists 435 common shares acquired from the issuer through a stock option exercise, with cash shown as the payment method and October 6, 2026 as the acquisition date.

What prior PTCT sales does the notice list for Mark Boulding?

The past-three-month table lists 5,079 shares on July 6, 2026, with a reported dollar amount of $432,115.62; 2,813 shares on August 17, 2026, with $204,123.09; and 1,638 shares on October 5, 2026, with $104,883.43.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/06/2026 - 04:07 PM Accepted by SEC EDGAR 10/06/2026 - 04:07 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001578852
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	PTC THERAPEUTICS, INC.
SEC File Number	001-35969
Address of Issuer	500 WARREN CORPORATE CENTER DRIVE WARREN NEW JERSEY 07059
Phone	9082227000
Name of Person for Whose Account the Securities are To Be Sold	Boulding Mark Elliott
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	435	27907.59	83460802	10/06/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/06/2026	Stock Option Exercise	Issuer			435	10/06/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mark Boulding 500 Warren Corporate Center Drive Warren NJ 07059	Common	07/06/2026	5079	432115.62
Mark Boulding 500 Warren Corporate Center Drive Warren NJ 07059	Common	08/17/2026	2813	204123.09
Mark Boulding 500 Warren Corporate Center Drive Warren NJ 07059	Common	10/05/2026	1638	104883.43

144: Remarks and Signature

Remarks
Date of Notice	10/06/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/10/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Boulding
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)