PTC Therapeutics Inc (PTCT) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 2, 2026.
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- Filings shown
- 13
- Open-market buys
- 0
- Open-market sells
- 40
Counts cover the 13 most recent Form 4 filings Tradune holds for PTCT (filed Jul 8 – Oct 2, 2026); the score below covers only the trailing 90 days (0 buys, 20 sells). No completed check of PTCT's Form 4 list on SEC EDGAR is on record yet; the latest PTCT filing Tradune holds was filed Oct 2, 2026. This is not guaranteed to be the complete record — see PTCT's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 8 filings Tradune holds for PTCT filed Jul 30 – Oct 2, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
20 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 20 sales· 115,105 sh
- checkbox disclosed
- On filings with the box not checked
- 0 sales· 0 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Michael SchmertzlerDirector | 0 | 16 | — | 90,000 | −$6,313,452 |
| Mark Elliott BouldingEXEC. VP AND CLO | 0 | 2 | — | 2,813 | −$204,127 |
| Steele Glenn Jr MD PHDDirector | 0 | 1 | — | 12,000 | −$781,920 |
| Matthew B. KleinCHIEF EXECUTIVE OFFICER | 0 | 1 | — | 10,292 | −$705,722 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at PTCT
No open-market insider purchases (Form 4 code P) were reported for PTCT between Jul 8, 2026 and Oct 2, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 12,000 | $65.16 | 22,500 | −35% | Sep 30, 2026 |
| Option exercise | 12,000 | $11.23 | 34,500 | +53% | Sep 30, 2026 |
| Option exercise Stock Option (Right to Buy) | 12,000 | — | — | — | Sep 30, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 376 | $68.45 | 1,296,594 (indirect) | −0.0% | Sep 17, 2026 |
| Open-market sale 10b5-1 box checked | 9,624 | $67.83 | 1,296,970 (indirect) | −0.7% | Sep 17, 2026 |
| Open-market sale 10b5-1 box checked | 2,994 | $66.58 | 1,313,600 (indirect) | −0.2% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 7,006 | $67.35 | 1,306,594 (indirect) | −0.5% | Sep 16, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 10,000 | $67.34 | 1,316,594 (indirect) | −0.8% | Sep 10, 2026 |
| Open-market sale 10b5-1 box checked | 9,428 | $67.79 | 1,327,166 (indirect) | −0.7% | Sep 9, 2026 |
| Open-market sale 10b5-1 box checked | 572 | $68.67 | 1,326,594 (indirect) | −0.0% | Sep 9, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 11,890 | $71.55 | 1,337,204 (indirect) | −0.9% | Aug 27, 2026 |
| Open-market sale 10b5-1 box checked | 610 | $72.22 | 1,336,594 (indirect) | −0.0% | Aug 27, 2026 |
| Open-market sale 10b5-1 box checked | 6,874 | $72.74 | 1,354,720 (indirect) | −0.5% | Aug 26, 2026 |
| Open-market sale 10b5-1 box checked | 5,626 | $73.18 | 1,349,094 (indirect) | −0.4% | Aug 26, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 2,390 | $71.88 | 1,362,285 (indirect) | −0.2% | Aug 20, 2026 |
| Open-market sale 10b5-1 box checked | 691 | $72.92 | 1,361,594 (indirect) | −0.1% | Aug 20, 2026 |
| Open-market sale 10b5-1 box checked | 9,419 | $70.78 | 1,364,675 (indirect) | −0.7% | Aug 20, 2026 |
| Open-market sale 10b5-1 box checked | 5,335 | $72.86 | 1,381,259 (indirect) | −0.4% | Aug 19, 2026 |
| Open-market sale 10b5-1 box checked | 7,165 | $73.67 | 1,374,094 (indirect) | −0.5% | Aug 19, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 969 | $72.90 | 105,272 | −0.9% | Aug 17, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,813 | — | — | — | Aug 17, 2026 |
| Open-market sale 10b5-1 box checked | 1,844 | $72.39 | 106,241 | −1.7% | Aug 17, 2026 |
| Option exercise | 2,813 | $25.69 | 108,085 | +2.7% | Aug 17, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 10,292 | $68.57 | 383,868 | −2.6% | Aug 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 2,000 | — | 52,526 | +4.0% | Jul 28, 2026 |
| Grant / award | 4,000 | — | 50,526 | +8.6% | Jul 28, 2026 |
| Grant / award Stock Option (Right to Buy) | 3,475 | — | — | — | Jul 28, 2026 |
| Grant / award Stock Option (Right to Buy) | 1,738 | — | — | — | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 3,494 | $80.35 | 83,986 | −4.0% | Jul 14, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 5,834 | $42.95 | 27,647 | +27% | Jul 9, 2026 |
| Open-market sale 10b5-1 box checked | 5,834 | $90.00 | 21,813 | −21% | Jul 9, 2026 |
| Option exercise Stock Option (Right to Buy) | 10,000 | — | — | — | Jul 9, 2026 |
| Option exercise Stock Option (Right to Buy) | 5,834 | — | — | — | Jul 9, 2026 |
| Option exercise | 10,000 | $42.95 | 31,813 | +46% | Jul 9, 2026 |
| Open-market sale 10b5-1 box checked | 10,000 | $90.00 | 21,813 | −31% | Jul 9, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 2,464 | $90.25 | 60,299 | −3.9% | Jul 9, 2026 |
| Option exercise | 2,464 | $46.54 | 62,763 | +4.1% | Jul 9, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,464 | — | — | — | Jul 9, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 11,369 | $89.03 | 69,587 | −14% | Jul 7, 2026 |
| Option exercise Stock Option (Right to Buy) | 24,613 | — | — | — | Jul 7, 2026 |
| Open-market sale 10b5-1 box checked | 9,288 | $89.44 | 60,299 | −13% | Jul 7, 2026 |
| Option exercise | 24,613 | $39.42 | 84,912 | +41% | Jul 7, 2026 |
| Open-market sale 10b5-1 box checked | 3,956 | $87.17 | 80,956 | −4.7% | Jul 7, 2026 |
| Option exercise | 811 | $38.10 | 61,110 | +1.3% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 426 | $85.28 | 60,684 | −0.7% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 385 | $86.34 | 60,299 | −0.6% | Jul 6, 2026 |
| Option exercise | 18,876 | $38.10 | 79,175 | +31% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 8,786 | $85.35 | 70,389 | −11% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 10,090 | $86.32 | 60,299 | −14% | Jul 6, 2026 |
| Option exercise | 2,474 | $39.42 | 62,773 | +4.1% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 2,474 | $87.03 | 60,299 | −3.9% | Jul 6, 2026 |
| Option exercise Stock Option (Right to Buy) | 811 | — | — | — | Jul 6, 2026 |
| Option exercise Stock Option (Right to Buy) | 18,876 | — | — | — | Jul 6, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,474 | — | — | — | Jul 6, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 645 | $85.84 | 106,017 | −0.6% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 745 | $86.38 | 105,272 | −0.7% | Jul 6, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,226 | — | — | — | Jul 6, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,813 | — | — | — | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 833 | $84.41 | 106,392 | −0.8% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 313 | $83.10 | 107,225 | −0.3% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 519 | $85.84 | 105,873 | −0.5% | Jul 6, 2026 |
| Option exercise | 2,266 | $39.42 | 107,538 | +2.2% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 601 | $86.38 | 105,272 | −0.6% | Jul 6, 2026 |
| Option exercise | 2,813 | $46.54 | 108,085 | +2.7% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 387 | $83.10 | 107,698 | −0.4% | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 1,036 | $84.41 | 106,662 | −1.0% | Jul 6, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to PTCT's (Oct 2, 2026).
Frequently asked about PTCT insider activity
How many insiders bought PTCT stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of PTCT shares were reported by PTC Therapeutics Inc insiders between Jul 8, 2026 and Oct 2, 2026. The 13 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for PTCT?
The most recent Form 4 on this page was filed by Steele Glenn Jr MD PHD (Director) on Oct 2, 2026, reporting 3 transactions. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market PTCT insider sale shown?
The largest open-market sale among the filings shown was 11,369 PTCT shares at $89.03 (about $1,012,182) by Neil Gregory Almstead (CHIEF TECHNICAL OPS OFFICER) on Jul 7, 2026. Value is shares × the price reported on the Form 4; that Form 4 has the Rule 10b5-1 box checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track PTCT insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.