Mark Elliott Boulding - 17 Aug 2026 Form 4 Insider Report for PTC THERAPEUTICS, INC. (PTCT)

Reporting relationship: EXEC. VP AND CLO
Issuer ticker: PTCT
Reported as of: 17 Aug 2026
Net transaction value: -$204,127
SEC form: 4
Accepted by SEC: 19 Aug 2026, 17:20:05 UTC
Prior SEC filing: 08 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Avraham S. Adler, Attorney-in-Fact

Key filing fact

Mark Elliott Boulding filed Form 4 for PTC THERAPEUTICS, INC. (PTCT) on 19 Aug 2026.

Key facts

This page summarizes Mark Elliott Boulding's Form 4 filing for PTC THERAPEUTICS, INC. (PTCT).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 19 Aug 2026, 17:20.

Change

Previous filing in this sequence was filed on 08 Jul 2026.
Current net transaction value: -$204,127.

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 0001578852 Primary reporting owner

Boulding Mark Elliott

Relationship: EXEC. VP AND CLO
Address: C/O PTC THERAPEUTICS, INC., 500 WARREN CORPORATE CENTER DRIVE, WARREN
Signature: /s/ Avraham S. Adler, Attorney-in-Fact
Signature date: 19 Aug 2026

Reported non-derivative transactions

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

PTCT transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,813
Change %: +2.7%
Price: $25.69^*
Shares after: 108,085
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1

PTCT transaction

Common Stock

Sale

Transaction value: $133,487
Shares: -1,844
Change %: -1.7%
Price: $72.39
Shares after: 106,241
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F2

PTCT transaction

Common Stock

Sale

Transaction value: $70,640
Shares: -969
Change %: -0.91%
Price: $72.90
Shares after: 105,272
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

PTCT transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -2,813
Change %: -14%
Price: $0.000000^*
Shares after: 16,876
Date: 17 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,813
Exercise price: $25.69
Footnotes: F1, F4

^* 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 4 footnotes

Footnote F1

This transaction was effected pursuant to a written Rule 10b5-1 plan adopted by the Reporting Person on September 10, 2025.

Footnote F2

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $71.72 to $72.67 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

This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $72.73 to $73.02 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 F4

This option was granted on February 15, 2024, and vests over four years, with 25% of the shares underlying the option vesting on February 15, 2025, and an additional 6.25% of the original number of shares underlying the option vesting at the end of each successive three-month period thereafter, beginning on May 15, 2025.