The proposed sale is de minimis and follows a pattern of periodic insider sales, likely for tax or personal liquidity purposes. No material read-through for the stock. Monitor for any acceleration in insider selling volume or a change in the officer's role.
Price Chart
Executive Summary
Mark Elliott Boulding, an officer of PTC Therapeutics, filed a Form 144 notice of intent to sell 435 shares of common stock, with an estimated aggregate market value of $27,907.59. The shares are to be sold through Fidelity Brokerage Services LLC, and the filing indicates the shares were acquired via a stock option exercise on the same date. The proposed sale is very small in both absolute dollar terms and relative to the officer's recent trading history, suggesting a routine liquidity event rather than a signal of concern.
Key Facts
- Officer Mark Elliott Boulding filed Form 144 to sell 435 shares of common stock.
- Estimated aggregate market value of the proposed sale is $27,907.59.
- Shares were acquired via a stock option exercise on October 6, 2026.
- The sale is to be executed through Fidelity Brokerage Services LLC on the NASDAQ exchange.
- The filing notes recent sales by the same insider: 5,079 shares on July 6, 2026 ($432,115.62), 2,813 shares on August 17, 2026 ($204,123.09), and 1,638 shares on October 5, 2026 ($104,883.43).
Financial Impact
Proposed sale of $27,907.59, less than 0.01% of PTC Therapeutics' market cap (estimated ~$6B based on recent trading).
Risk Factors
- Insider selling, even small, can be misinterpreted by the market as a lack of confidence.
- The officer has sold a total of ~$769K in shares over the past three months, which may attract attention if the stock underperforms.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001959173-26-007297 |
| Document: 0001959173-26-007297-index.html | 0001959173-26-007297 |
| Document: 0001959173-26-007297.txt | 0001959173-26-007297 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 27, 2026 1d ago | Institutional Cluster | $61.07 | awaiting T+1 | awaiting T+1 | $64.44 (+5.53%) |
Oct 16, 2026 12d ago | Insider Cluster | $61.53 $62.92 | ▲ +2.26% | ▲ +1.92% | $64.44 (+4.74%) |
Oct 9, 2026 19d ago | 144 | $62.92 $59.92 | ▼ −4.77% | ▼ −4.76% | $64.44 (+2.42%) |
Oct 7, 2026 21d ago | 144 | $62.56 $64.70 | ▲ +3.42% | ▲ +2.82% | $64.44 (+3.01%) |
Oct 6, 2026 22d ago | 144 | $63.23 $62.56 | ▼ −1.06% | ▼ −0.64% | $64.44 (+1.92%) |
Sep 21, 2026 5w ago | Press Release | $65.96 $62.34 | ▼ −5.49% | ▼ −4.77% | $64.44 (−2.30%) |
Aug 21, 2026 9w ago | Insider Cluster | $71.06 $73.47 | ▲ +3.39% | ▲ +3.07% | $64.44 (−9.31%) |
Jul 16, 2026 14w ago | Insider Cluster | $78.59 $78.01 | ▼ −0.74% | ▼ −0.58% | $64.44 (−18.00%) |
Jul 16, 2026 15w ago | Press Release | $78.52 | awaiting T+1 | awaiting T+1 | $64.44 (−17.93%) |
Jul 13, 2026 15w ago | Insider Cluster | $78.06 $78.84 | ▲ +1.00% | ▲ +0.60% | $64.44 (−17.44%) |
US Market Status
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