PTC Therapeutics (NASDAQ: PTCT) affiliate to sell 50,000 shares

Rhea-AI Filing Summary

PTC THERAPEUTICS, INC. (PTCT) received an amended Rule 144 notice indicating that Section Six Partners, L.P., identified as an affiliate of a director, plans to sell up to 50,000 shares of common stock through Merrill Lynch on NASDAQ. The amendment revises the seller’s name and related securities information. The shares to be sold were acquired on 06/25/2013 via automatic conversion of preferred stock into common stock upon the company’s IPO, from the issuer for cash. As of 08/19/2026, there were 83,460,802 shares of common stock outstanding. Director Michael Schmertzler, a general and limited partner of Section Six Partners, disclaims beneficial ownership of these shares except to the extent of his pecuniary interest.

Key Figures

Shares to be sold under Rule 144: 50,000 shares Aggregate market value of shares to be sold: $3,650,000 Shares outstanding: 83,460,802 shares +2 more

5 metrics

Shares to be sold under Rule 144 50,000 shares Common stock planned for sale by Section Six Partners, L.P.

Aggregate market value of shares to be sold $3,650,000 Reported value for the 50,000 common shares to be sold

Shares outstanding 83,460,802 shares Common stock outstanding as of 08/19/2026

Acquisition date of securities 06/25/2013 Date of automatic conversion of preferred stock into common stock upon IPO

Trading market NASDAQ Planned venue for sale of the common stock

Key Terms

Rule 144, automatic conversion, affiliate of Director, beneficial ownership

4 terms

Rule 144 regulatory

"See the definition of "person" in 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.

automatic conversion financial

"Automatic Conversion of Preferred Stock into Common Stock Upon IPO"

affiliate of Director regulatory

"Name of Person for Whose Account the Securities are To Be Sold | Section Six Partners, L.P. Affiliate of Director"

beneficial ownership financial

"Mr. Schmertzler disclaims beneficial ownership of the shares held by Section Six Partners"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

What does the Form 144/A filing for PTCT disclose?

It discloses that Section Six Partners, L.P., an affiliate of a director of PTC THERAPEUTICS, INC. (PTCT), has filed an amended Rule 144 notice to sell up to 50,000 shares of PTCT common stock on NASDAQ. The amendment updates the seller’s name and related securities details.

How many PTCT shares is Section Six Partners, L.P. planning to sell?

Section Six Partners, L.P. plans to sell up to 50,000 shares of PTC THERAPEUTICS, INC. common stock under Rule 144. The shares will be sold through Merrill Lynch on NASDAQ, according to the filing.

What is the reported market value of the PTCT shares to be sold?

The filing reports an aggregate market value of $3,650,000 for the 50,000 shares of PTC THERAPEUTICS, INC. common stock proposed to be sold under Rule 144.

How many PTCT shares were outstanding as of August 19, 2026?

As of 08/19/2026, there were 83,460,802 shares of PTC THERAPEUTICS, INC. common stock outstanding, as stated in the Form 144/A filing.

When and how were the PTCT shares being sold originally acquired?

The 50,000 shares being sold were acquired on 06/25/2013 through an automatic conversion of preferred stock into common stock upon IPO, with the preferred stock originally acquired from the issuer for cash.

What is Michael Schmertzler’s relationship to the PTCT share seller?

Michael Schmertzler is a member of the Board of Directors of PTC THERAPEUTICS, INC. and is both a general partner and limited partner of Section Six Partners, L.P. He disclaims beneficial ownership of the shares held by Section Six Partners except for his pecuniary interest.

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Available on EDGAR 08/25/2026 - 04:23 PM Accepted by SEC EDGAR 08/25/2026 - 04:22 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/A

144/A: Filer Information

Filer CIK	0001288952
Filer CCC	XXXXXXXX
Previous Accession Number Of The Filing	0001628280-26-058006
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144/A: 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	Section Six Partners, L.P.
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	Affiliate of Director

144/A: 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	Merrill Lynch 225 Liberty Street Fl 39 New York NY 10281	50000	3650000	83460802	08/19/2026	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/A: 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	06/25/2013	Automatic Conversion of Preferred Stock into Common Stock Upon IPO	Issuer			50000	06/25/2013	Automatic Conversion of Preferred Stock into Common Stock upon IPO (Preferred Stock acquired from Issuer for 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/A: Securities Sold During The Past 3 Months

Nothing to Report

144/A: Remarks and Signature

Remarks	This amendment is being filed to revise the name of the seller and certain information related to certain securities to be sold. Michael Schmertzler is a member of the Board of Directors of the Issuer. He is also a general partner and limited partner of Section Six Partners, L.P. Mr. Schmertzler disclaims beneficial ownership of the shares held by Section Six Partners, L.P., except to the extent of his pecuniary interest therein.
Date of Notice	08/25/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/14/2026
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	Michael Schmertzler, as President of S6 GP Holding, LLC, the General Partner of, and on behalf of, Section Six Partners, LP
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)