This is a routine insider sale by an officer with no material impact on the stock. Monitor for any acceleration of insider selling or a pattern of larger dispositions ahead of upcoming earnings or catalysts, but no immediate action is warranted.
Price Chart
Executive Summary
Sara Bonstein, an officer of Insmed, filed a Form 144 on May 13, 2026, indicating intent to sell 8,272 shares of common stock through Merrill Lynch. At the current market cap of $25.1B, the proposed sale value of approximately $2.2M is modest relative to the company's size and represents a routine insider transaction. The filing does not disclose the specific role of the officer, but the sale is not flagged as a CEO/CFO disposition and follows a pattern of recent insider selling activity.
Key Facts
- Insider Sara Bonstein (officer) filed Form 144 to sell 8,272 shares of INSM common stock.
- Sale is planned through Merrill Lynch with an estimated market value of approximately $2.2M based on current price.
- Transaction date noted as May 11, 2026, with filing on May 13, 2026.
- Recent 30-day insider activity includes 3 sells totaling $1.6M, consistent with routine insider selling.
- No CEO or CFO sale indicated; the filing is a standard intent-to-sell notice.
Financial Impact
Proposed sale of 8,272 shares valued at approximately $2.2M, representing a small fraction of total insider holdings and less than 0.01% of market cap.
Risk Factors
- Potential for additional insider selling if the officer or other insiders increase dispositions.
- No material risk to the company's fundamentals from this filing.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001628280-26-034690 |
| Document: 0001628280-26-034690-index.html | 0001628280-26-034690 |
| Document: 0001628280-26-034690.txt | 0001628280-26-034690 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 19, 2026 6w ago | Insider Cluster | $130.66 $119.92 | ▼ −8.22% | ▼ −6.70% | $109.99 (−15.82%) |
Aug 12, 2026 7w ago | Insider Cluster | $126.33 $129.41 | ▲ +2.44% | ▲ +4.19% | $109.99 (−12.93%) |
Aug 6, 2026 8w ago | 8-K | $132.55 $126.68 | ▼ −4.43% | ▼ −5.03% | $109.99 (−17.02%) |
Jul 24, 2026 10w ago | Institutional Cluster | $106.92 $125.77 | ▲ +17.63% | ▲ +14.00% | $109.99 (+2.87%) |
Jul 21, 2026 10w ago | ANALYST-UPGRADE | $108.62 $128.46 | ▲ +18.27% | ▲ +15.70% | $109.99 (+1.26%) |
Jul 16, 2026 11w ago | 8-K | $107.46 $126.33 | ▲ +17.56% | ▲ +13.94% | $109.99 (+2.35%) |
Jun 26, 2026 13w ago | Insider Cluster | $104.74 $106.92 | ▲ +2.08% | ▲ +2.36% | $109.99 (+5.01%) |
Jun 5, 2026 16w ago | Insider Cluster | $94.17 $111.54 | ▲ +18.45% | ▲ +16.81% | $109.99 (+16.80%) |
Jun 5, 2026 16w ago | Insider Cluster | $94.17 $111.54 | ▲ +18.45% | ▲ +16.81% | $109.99 (+16.80%) |
May 15, 2026 19w ago | S-3ASR | $107.15 $95.52 | ▼ −10.85% | ▼ −12.44% | $109.99 (+2.65%) |
US Market Status
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