PTC Therapeutics: Section Six Partners sells shares

Q: How many PTCT shares did Section Six Partners sell, and at what prices?

Section Six Partners, L.P. reported sales of 2,118 shares at a weighted-average $59.52 per share and 382 shares at a weighted-average $60.14 per share on October 14, 2026. The shares were held by the partnership.

A partnership of which a director is a general and limited partner reported trades spanning $58.85–$59.82 and $59.87–$60.54 per share.

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Rhea-AI Filing Summary

PTC Therapeutics, Inc. director Michael Schmertzler reported that Section Six Partners, L.P. sold 2,118 shares of common stock at a weighted-average $59.52 per share and 382 shares at a weighted-average $60.14 per share on October 14, 2026. Both sales were under a written Rule 10b5-1 plan adopted May 14, 2026. Schmertzler reported direct holdings of 163,266 shares after the transactions; the sold shares were held by the partnership, and he disclaimed beneficial ownership except to the extent of his pecuniary interest.

Insider Trade Summary 10b5-1

Net Seller: 2,500 shares

Net Sell 3 txns

Insider SCHMERTZLER MICHAEL

Role Director

Sold 2,500 shs ($149K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^{F1, F2, F3}	2,118	$59.52	$126K
Sale	Common Stock ^{F1, F4, F3}	382	$60.14	$23K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,291,594 shares (Indirect, See footnote); Common Stock — 163,266 shares (Direct)

Footnotes (4)

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.
F2. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $58.85 to $59.82 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.
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.
F4. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $59.87 to $60.54 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.

Key Figures

Shares sold by Section Six Partners, L.P.: 2,118 shares Weighted-average sale price: $59.52 per share Shares sold by Section Six Partners, L.P.: 382 shares +2 more

5 metrics

Shares sold by Section Six Partners, L.P. 2,118 shares October 14, 2026

Weighted-average sale price $59.52 per share 2,118-share sale on October 14, 2026

Shares sold by Section Six Partners, L.P. 382 shares October 14, 2026

Weighted-average sale price $60.14 per share 382-share sale on October 14, 2026

Direct common stock holdings 163,266 shares Reported after the transactions on October 14, 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 financial

"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 Section Six Partners sell, and at what prices?

Section Six Partners, L.P. reported sales of 2,118 shares at a weighted-average $59.52 per share and 382 shares at a weighted-average $60.14 per share on October 14, 2026. The shares were held by the partnership.

What were the trading-price ranges for the PTCT sales?

The 2,118-share sale at a weighted-average $59.52 per share comprised trades from $58.85 to $59.82 per share. The 382-share sale at a weighted-average $60.14 per share comprised trades from $59.87 to $60.54 per share.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/16/2026 - 05:20 PM EDT Accepted by SEC EDGAR 10/16/2026 - 05:20 PM EDT

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).

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)
10/14/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock								163,266	D
Common Stock	10/14/2026		S⁽¹⁾		2,118	D	$59.52⁽²⁾	1,291,976	I	See footnote⁽³⁾
Common Stock	10/14/2026		S⁽¹⁾		382	D	$60.14⁽⁴⁾	1,291,594	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $58.85 to $59.82 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.

4. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $59.87 to $60.54 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.

	/s/ Avraham S. Adler, Attorney-in-Fact	10/16/2026
	** 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)

Source: View Original Filing on SEC EDGAR