PTC Therapeutics: Section Six proposes $644K sale

The notice pairs the proposed sale with a reported count of 83,460,802 PTC Therapeutics shares outstanding.

Rhea-AI Filing Summary

A Rule 144 notice concerning PTC Therapeutics, Inc. lists Section Six Partners, L.P. as proposing to sell 10,000 common shares, with an aggregate market value of $643,500 and an approximate sale date of October 7, 2026. Merrill Lynch is listed as broker; the notice reports 83,460,802 issuer shares outstanding.

Michael Schmertzler, a member of PTC Therapeutics’ Board of Directors, is a general and limited partner of Section Six Partners. He disclaims beneficial ownership of the partnership’s shares except to the extent of his pecuniary interest. The notice lists eight prior sales by the partnership from August 19 through September 17, 2026, in individual blocks of 10,000 or 12,500 shares.

Key Figures

Proposed shares for sale: 10,000 shares Aggregate market value: $643,500 Issuer shares outstanding: 83,460,802 shares +1 more

4 metrics

Proposed shares for sale 10,000 shares PTC Therapeutics common shares

Aggregate market value $643,500 Proposed sale

Issuer shares outstanding 83,460,802 shares Reported in the notice

Prior sale transaction size 12,500 shares Each of four listed sales on August 19, August 20, August 26, and August 27, 2026

Key Terms

Rule 144, beneficial ownership, pecuniary interest, Automatic Conversion of Preferred Stock into Common Stock Upon IPO, +1 more

5 terms

Rule 144 regulatory

"sales required by paragraph (e) 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.

beneficial ownership regulatory

"disclaims beneficial ownership of the shares held by Section Six Partners, L.P."

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.

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

Automatic Conversion of Preferred Stock into Common Stock Upon IPO financial

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

Affiliate of Director regulatory

"Affiliate of Director"

FAQ

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

How many PTCT shares does Section Six Partners propose to sell?

Section Six Partners, L.P. proposes to sell 10,000 common shares, with an aggregate market value of $643,500. The notice gives an approximate sale date of October 7, 2026, and lists Merrill Lynch as broker.

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

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Available on EDGAR 10/07/2026 - 04:38 PM Accepted by SEC EDGAR 10/07/2026 - 04:37 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	0001288952
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
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: 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 One Bryant Park Fl 47 New York NY 10036	10000	643500	83460802	10/07/2026	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	06/25/2013	Automatic Conversion of Preferred Stock into Common Stock Upon IPO	Issuer			10000	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: 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
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	08/19/2026	12500	916553.65
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	08/20/2026	12500	888857.74
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	08/26/2026	12500	911725.45
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	08/27/2026	12500	894783.7
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	09/09/2026	10000	678403.36
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	09/10/2026	10000	673400
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	09/16/2026	10000	671194.64
Section Six Partners, LP c/o PTC Therapeutics, Inc 500 Warren Corporate Center Drive Warren NJ 07059	Common	09/17/2026	10000	678533.12

144: Remarks and Signature

Remarks	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	10/07/2026
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)