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PTC Therapeutics (PTCT) director sells 25K shares under trading plan

Filing Impact
(High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

PTC THERAPEUTICS, INC. (PTCT) reported that director Michael Schmertzler, through Section Six Partners, L.P., with indirect ownership, sold a total of 25,000 shares of common stock on August 26–27, 2026 under a written Rule 10b5-1 plan adopted on May 14, 2026. The sales were open-market transactions at weighted average prices around $71.55–$73.18 per share, each executed in multiple trades within disclosed price ranges. Separately, Schmertzler directly held 163,266 shares of common stock as of August 26, 2026. He disclaims beneficial ownership of the Section Six Partners, L.P. shares except to the extent of his pecuniary interest.

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Insider SCHMERTZLER MICHAEL
Role Director
Sold 25,000 shs ($1.81M)
Type Security Shares Price Value
Sale Common Stock F1, F5, F3 11,890 $71.55 $851K
Sale Common Stock F1, F6, F3 610 $72.22 $44K
Sale Common Stock F1, F2, F3 6,874 $72.74 $500K
Sale Common Stock F1, F4, F3 5,626 $73.18 $412K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 1,336,594 shares (Indirect, See footnote); Common Stock — 163,266 shares (Direct)
Footnotes (6)
  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 $72.02 to $73.01 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.
  4. F4. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $73.02 to $73.40 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.
  5. F5. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $70.94 to $71.92 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.
  6. F6. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $72.11 to $72.25 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.
Total shares sold 25,000 shares of common stock Open-market sales on August 26–27, 2026 by an entity associated with the director
Sale on 2026-08-27 11,890 shares at $71.55 per share Indirect sale of PTCT common stock; price reported as a per-share weighted average
Sale on 2026-08-27 610 shares at $72.22 per share Indirect sale in multiple trades; weighted average price with trades from $72.11–$72.25
Sale on 2026-08-26 6,874 shares at $72.74 per share Indirect sale; weighted average of trades between $72.02 and $73.01 per share
Sale on 2026-08-26 5,626 shares at $73.18 per share Indirect sale; weighted average of trades between $73.02 and $73.40 per share
Direct holdings after transaction 163,266 shares of common stock Directly held by Michael Schmertzler as of August 26, 2026
Rule 10b5-1 plan adoption date May 14, 2026 Written trading plan adopted by Section Six Partners, L.P. covering these sales
Lowest and highest trade prices in ranges $70.94–$73.40 per share Price ranges across the multiple trades underlying reported weighted average sale prices
Rule 10b5-1 plan regulatory
"This transaction was effected pursuant to a written Rule 10b5-1 plan adopted"
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
"This price represents the 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.
pecuniary interest financial
"except to the extent of his pecuniary interest therein"
indirect ownership financial
"direct_or_indirect": "I","nature_of_ownership": "See footnote""
open market or private transaction financial
"transaction_code_description": "Sale in open market or private transaction""

FAQ

What insider transactions did PTCT disclose for Michael Schmertzler in this Form 4?
The filing reports that an entity associated with director Michael Schmertzler sold 25,000 shares of PTC THERAPEUTICS, INC. common stock in open-market transactions on August 26–27, 2026, all under a written Rule 10b5-1 trading plan.

At what prices were the PTCT shares sold in this Form 4?
The reported sales of PTCT common stock occurred at weighted average prices of about $72.74, $73.18, $71.55 and $72.22 per share. Footnotes explain that each is a weighted average of multiple trades within disclosed ranges between $70.94 and $73.40 per share.

How many PTCT shares did Michael Schmertzler sell in total?
According to the Form 4, entities associated with director Michael Schmertzler sold a total of 25,000 shares of PTC THERAPEUTICS, INC. common stock in four transactions on August 26–27, 2026, all coded as open-market or private sales of non-derivative common stock.

Were the PTCT insider sales made under a Rule 10b5-1 plan?
Yes. A footnote states that the transactions were effected under a written Rule 10b5-1 plan adopted by Section Six Partners, L.P. on May 14, 2026, and the filing’s Rule 10b5-1 checkbox is marked as affirming use of such a plan.

What PTCT holdings does Michael Schmertzler report after these transactions?
The Form 4 shows a direct holding of 163,266 shares of PTC THERAPEUTICS, INC. common stock as of August 26, 2026. Shares sold were held indirectly by Section Six Partners, L.P., for which he disclaims beneficial ownership beyond his pecuniary interest.

Who actually held the PTCT shares sold in this Form 4?
The sold shares are reported as held by Section Six Partners, L.P.. Michael Schmertzler is a general and limited partner of this partnership and reports the transactions indirectly, while disclaiming beneficial ownership of those shares except to the extent of his pecuniary interest.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock163,266D
Common Stock08/26/2026S(1)6,874D$72.74(2)1,354,720ISee footnote(3)
Common Stock08/26/2026S(1)5,626D$73.18(4)1,349,094ISee footnote(3)
Common Stock08/27/2026S(1)11,890D$71.55(5)1,337,204ISee footnote(3)
Common Stock08/27/2026S(1)610D$72.22(6)1,336,594ISee 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 $72.02 to $73.01 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 $73.02 to $73.40 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.
5. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $70.94 to $71.92 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.
6. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $72.11 to $72.25 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-Fact08/28/2026
** Signature of Reporting PersonDate
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