PTC Therapeutics: Section Six sells 2,500 shares

The partnership's sales were made under a written Rule 10b5-1 plan adopted May 14, 2026.

Rhea-AI Filing Summary

PTC Therapeutics, Inc. (PTCT) director Michael Schmertzler reported that Section Six Partners, L.P., of which he is a general and limited partner, sold 2,500 common shares in two transactions on October 7, 2026: 2,447 shares at a weighted average $63.38 per share and 53 shares at $63.95. The 2,447-share price reflects multiple trades ranging from $62.89 to $63.88. Both sales were made under the partnership's written Rule 10b5-1 plan adopted May 14, 2026. The shares were held by the partnership; Schmertzler disclaims beneficial ownership except to the extent of his pecuniary interest. A separate entry lists 163,266 shares held directly.

Insider Trade Summary 10b5-1

Net Seller: 2,500 shares

Net Sell 3 txns

Insider SCHMERTZLER MICHAEL

Role Director

Sold 2,500 shs ($158K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3	2,447	$63.38	$155K
Sale	Common Stock F1, F3	53	$63.95	$3K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,294,094 shares (Indirect, See footnote); Common Stock — 163,266 shares (Direct)

Footnotes (3)

1. F1. This transaction was effected pursuant to a written Rule 10b5-1 plan adopted by Section Six Partners, L.P., of which the Reporting Person is a general partner and limited partner, on May 14, 2026.
2. F2. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $62.89 to $63.88 per share. The Reporting Person hereby undertakes, upon request by the SEC staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.
3. F3. Represents shares of common stock held by Section Six Partners, L.P. The Reporting Person is a general and limited partner of Section Six Partners, L.P. The Reporting Person disclaims beneficial ownership of the shares of common stock held by Section Six Partners, L.P. except to the extent of his pecuniary interest therein.

Key Figures

Shares sold: 2,500 shares Shares sold: 2,447 shares Weighted average sale price: $63.38 per share +3 more

6 metrics

Shares sold 2,500 shares Total across two reported transactions on October 7, 2026

Shares sold 2,447 shares Section Six Partners, L.P.; October 7, 2026

Weighted average sale price $63.38 per share For the 2,447-share transaction; trades ranged from $62.89 to $63.88

Shares sold 53 shares Section Six Partners, L.P.; October 7, 2026

Sale price $63.95 per share For the 53-share transaction on October 7, 2026

Direct common shares held 163,266 shares Separate holding entry dated October 7, 2026

Key Terms

Rule 10b5-1 plan, weighted average price, beneficial ownership, pecuniary interest

4 terms

Rule 10b5-1 plan regulatory

"written Rule 10b5-1 plan adopted by Section Six Partners, L.P."

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average price financial

"weighted average price of sale transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

beneficial ownership regulatory

"disclaims beneficial ownership of the shares"

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"

FAQ

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

How many PTCT shares did director Michael Schmertzler report selling?

Section Six Partners, L.P., of which Michael Schmertzler is a general and limited partner, reported sales totaling 2,500 common shares on October 7, 2026. The sales comprised 2,447 shares at a weighted average $63.38 per share and 53 shares at $63.95; both were made under the partnership's written Rule 10b5-1 plan adopted May 14, 2026.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/09/2026 - 05:20 PM Accepted by SEC EDGAR 10/09/2026 - 05:20 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SCHMERTZLER MICHAEL

(Last) (First) (Middle)

C/O PTC THERAPEUTICS, INC.

500 WARREN CORPORATE CENTER DRIVE

(Street)

WARREN NEW JERSEY 07059

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
PTC THERAPEUTICS, INC. [ PTCT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/07/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock								163,266	D
Common Stock	10/07/2026		S(1)		2,447	D	$63.38(2)	1,294,147	I	See footnote(3)
Common Stock	10/07/2026		S(1)		53	D	$63.95	1,294,094	I	See footnote(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was effected pursuant to a written Rule 10b5-1 plan adopted by Section Six Partners, L.P., of which the Reporting Person is a general partner and limited partner, on May 14, 2026.

2. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $62.89 to $63.88 per share. The Reporting Person hereby undertakes, upon request by the SEC staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

3. Represents shares of common stock held by Section Six Partners, L.P. The Reporting Person is a general and limited partner of Section Six Partners, L.P. The Reporting Person disclaims beneficial ownership of the shares of common stock held by Section Six Partners, L.P. except to the extent of his pecuniary interest therein.

	/s/ Avraham S. Adler, Attorney-in-Fact	10/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)