PTC Therapeutics holder to sell 50,000 shares

PTC THERAPEUTICS, INC.

Rhea-AI Filing Summary

PTC THERAPEUTICS, INC. (PTCT) is the issuer for a planned resale of its common stock under Rule 144. Michael Schmertzler, for whose account the sale will occur, through Section Six Partners, LP, has notified of an intended sale of 50,000 common shares, expected to be executed in the open market via Merrill Lynch on NASDAQ. The shares were acquired on 07/04/2012. Shares outstanding were 83,460,802 as of 08/19/2026; this is a baseline figure, not the amount being sold.

Key Figures

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

5 metrics

Shares to be sold 50,000 shares Planned Rule 144 sale of PTCT common stock for the account of Michael Schmertzler

Aggregate market value of securities owned $3,650,000 Reported alongside 50,000 shares of PTCT common stock held

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

Acquisition date of shares 07/04/2012 Date the 50,000 PTCT shares to be sold were acquired in the open market

Proposed sale date 06/25/2013 Date associated with the planned sale of 50,000 PTCT shares for cash

Key Terms

Rule 144, Open Market, general partner, aggregate market value

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.

Open Market financial

"Common | 07/04/2012 | Open Market | Section Six Partners, LP"

An open market is a system where buying and selling of goods, services, or financial assets happen freely without restrictions or special controls. For investors, it means they can trade assets easily and quickly, which helps determine fair prices based on supply and demand. This environment encourages transparency and competition, making it easier to buy or sell with confidence.

general partner financial

"as President of S6 GP Holding, LLC, the General Partner of"

A general partner is the person or firm that runs an investment partnership and legally represents it — they make the day-to-day decisions, choose which assets to buy or sell, and are responsible for the partnership’s obligations. Investors care because the general partner’s judgment, risk-taking and fee and profit-sharing arrangements determine both the potential returns and the level of exposure to losses; think of the GP as the ship’s captain whose skill and honesty shape the voyage’s outcome.

aggregate market value financial

"Common | Merrill Lynch ... | 50000 | 3650000 | 83460802"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does this Form 144 filing mean for PTC THERAPEUTICS, INC. (PTCT)?

It discloses a planned resale of 50,000 PTCT common shares under Rule 144 by an existing holder. This is a notice of potential secondary-market sales and does not itself involve new share issuance by PTC THERAPEUTICS, INC.

How many PTCT shares are covered by Michael Schmertzler’s Form 144 notice?

The notice covers a proposed sale of 50,000 shares of PTCT common stock. These shares are to be sold for the account of Michael Schmertzler, through Section Six Partners, LP, in transactions described as open market sales.

Who is the selling security holder in this PTCT Form 144 filing?

The sale is for the account of Michael Schmertzler, with Section Six Partners, LP listed in the sale details. Schmertzler signed as President of S6 GP Holding, LLC, the general partner of Section Six Partners, LP, indicating an affiliated investment entity is involved.

When were the PTCT shares to be sold under this Form 144 originally acquired?

The 50,000 PTCT shares covered by the notice were acquired on 07/04/2012. The method of acquisition is described as an open market purchase, which is a standard secondary-market transaction, not a primary issuance by the company.

How many PTCT shares were outstanding at the time referenced in the Form 144?

The filing reports 83,460,802 PTCT common shares outstanding as of 08/19/2026. This figure provides overall share-count context and is separate from the 50,000 shares covered by the planned Rule 144 resale notice.

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

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Available on EDGAR 08/19/2026 - 04:52 PM Accepted by SEC EDGAR 08/19/2026 - 04:51 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	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	Michael Schmertzler
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	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 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: 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	07/04/2012	Open Market	Section Six Partners, LP			50000	06/25/2013	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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/19/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/13/2026
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)