Michael Schmertzler - 19 Aug 2026 Form 4 Insider Report for PTC THERAPEUTICS, INC. (PTCT)

Reporting relationship: Director
Issuer ticker: PTCT
Reported as of: 19 Aug 2026
Net transaction value: -$1,805,411
SEC form: 4
Accepted by SEC: 21 Aug 2026, 17:20:05 UTC
Prior SEC filing: 06 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Avraham S. Adler, Attorney-in-Fact

Key filing fact

Michael Schmertzler filed Form 4 for PTC THERAPEUTICS, INC. (PTCT) on 21 Aug 2026.

Key facts

This page summarizes Michael Schmertzler's Form 4 filing for PTC THERAPEUTICS, INC. (PTCT).
5 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 21 Aug 2026, 17:20.

Change

Previous filing in this sequence was filed on 06 Jan 2026.
Current net transaction value: -$1,805,411.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001288952 Primary reporting owner

SCHMERTZLER MICHAEL

Relationship: Director
Address: C/O PTC THERAPEUTICS, INC., 500 WARREN CORPORATE CENTER DRIVE, WARREN
Signature: /s/ Avraham S. Adler, Attorney-in-Fact
Signature date: 21 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PTCT transaction

Common Stock

Sale

Transaction value: $388,708
Shares: -5,335
Change %: -0.38%
Price: $72.86
Shares after: 1,381,259
Date: 19 Aug 2026
Ownership: See footnote
Footnotes: F1, F2, F3

PTCT transaction

Common Stock

Sale

Transaction value: $527,846
Shares: -7,165
Change %: -0.52%
Price: $73.67
Shares after: 1,374,094
Date: 19 Aug 2026
Ownership: See footnote
Footnotes: F1, F3, F4

PTCT transaction

Common Stock

Sale

Transaction value: $666,677
Shares: -9,419
Change %: -0.69%
Price: $70.78
Shares after: 1,364,675
Date: 20 Aug 2026
Ownership: See footnote
Footnotes: F1, F3, F5

PTCT transaction

Common Stock

Sale

Transaction value: $171,793
Shares: -2,390
Change %: -0.18%
Price: $71.88
Shares after: 1,362,285
Date: 20 Aug 2026
Ownership: See footnote
Footnotes: F1, F3, F6

PTCT transaction

Common Stock

Sale

Transaction value: $50,388
Shares: -691
Change %: -0.05%
Price: $72.92
Shares after: 1,361,594
Date: 20 Aug 2026
Ownership: See footnote
Footnotes: F1, F3, F7

PTCT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 163,266
Date: 19 Aug 2026
Ownership: Direct

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 7 footnotes

Footnote 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

Footnote F2

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $72.33 to $73.32 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.

Footnote 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.

Footnote F4

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $73.33 to $74.02 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.

Footnote F5

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $70.50 to $71.49 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.

Footnote F6

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $71.50 to $72.46 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.

Footnote F7

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $72.60 to $73.48 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.