INSMED Inc Insider Trading Activity
Every SEC Form 4 insider transaction reported for INSMED Inc (INSM), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are INSM insiders buying or selling?
In the last 12 months, INSMED Inc insiders reported 0 open-market purchases ($0) and 58 sales ($165.6M) — net selling of $165.6M. Since May 2018, Trabud has recorded 258 Form 4 filings for INSM: 12 buys ($4.0M) and 246 sells ($462.4M).
Source: SEC EDGAR Form 4
What stands out
- No INSMED Inc insider made an open-market purchase in the last 12 months; the 58 reported open-market sales totaled $165.6M.
Key Statistics (May 2018 – Sep 11, 2026)
Total Form 4 filings
258
SEC EDGAR
Insider filers
19
Insider buys (12)
$4.0M
Insider sells (246)
$462.4M
Insider sentiment
Net sellingNet insider flow of $458.5M in net selling since May 2018, and $165.6M in net selling over the last 12 months.
Recent INSM insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Sep 11, 2026 | David R Brennan | Director | Sale | 25.0K | $124.00 | $3.1M | SEC ↗ |
| Aug 19, 2026 | Melvin Sharoky MD | Director | Sale | 5.0K | $127.53 | $637.6K | SEC ↗ |
| Aug 12, 2026 | Roger Adsett | Chief Operating Officer | Sale | 239.8K | $133.27 | $32.0M | SEC ↗ |
| Aug 7, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 27.2K | $128.61 | $3.5M | SEC ↗ |
| Jul 24, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $106.06 | $1.1M | SEC ↗ |
| Jul 10, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $117.40 | $1.3M | SEC ↗ |
| Jul 8, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 12.3K | $109.98 | $1.4M | SEC ↗ |
| Jun 26, 2026 | William Lewis | Chair and CEO | Sale | 21.4K | $103.32 | $2.2M | SEC ↗ |
| Jun 24, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 1.8K | $95.82 | $173.1K | SEC ↗ |
| Jun 10, 2026 | William Lewis | Chair and CEO | Sale | 6.5K | $94.03 | $612.6K | SEC ↗ |
| Jun 5, 2026 | Roger Adsett | Chief Operating Officer | Sale | 2.4K | $102.27 | $242.4K | SEC ↗ |
| Jun 5, 2026 | Sara Bonstein | Chief Financial Officer | Sale | 2.4K | $102.27 | $245.9K | SEC ↗ |
| Jun 5, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 2.2K | $102.27 | $220.8K | SEC ↗ |
| Jun 5, 2026 | William Lewis | Chair and CEO | Sale | 7.6K | $102.27 | $777.8K | SEC ↗ |
| Jun 5, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 4.4K | $102.90 | $455.2K | SEC ↗ |
| May 22, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 6.1K | $108.47 | $667.0K | SEC ↗ |
| May 20, 2026 | William Lewis | Chair and CEO | Sale | 25.6K | $106.33 | $2.7M | SEC ↗ |
| May 15, 2026 | Sara Bonstein | Chief Financial Officer | Sale | 8.3K | $116.18 | $961.0K | SEC ↗ |
| May 15, 2026 | Roger Adsett | Chief Operating Officer | Sale | 5.8K | $116.18 | $678.1K | SEC ↗ |
| May 15, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 18.3K | $116.12 | $2.1M | SEC ↗ |
| May 15, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 4.1K | $116.18 | $477.4K | SEC ↗ |
| May 15, 2026 | William Lewis | Chair and CEO | Sale | 13.3K | $116.18 | $1.5M | SEC ↗ |
| May 13, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 12.9K | $100.40 | $1.3M | SEC ↗ |
| May 6, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $137.34 | $1.5M | SEC ↗ |
| Apr 17, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $143.97 | $1.5M | SEC ↗ |
Showing the 25 most recent of 258 Form 4 filings for INSMED Inc.
Most active INSM insiders
- William Lewis60 filings
- Martina M.D. Flammer37 filings
- Michael Alexander Smith31 filings
- Nicole S Schaeffer Orlov29 filings
- Roger Adsett28 filings
Ask anything about INSM insider activity
Use Trabud's AI agent to query INSMED Inc's Form 4 history in plain English — "Show me INSM CEO purchases this year" or compare it against any other ticker.
Open the AI agentINSM insider trading FAQ
Are INSMED Inc insiders buying or selling?
In the last 12 months, INSMED Inc insiders reported 0 open-market purchases ($0) and 58 sales ($165.6M) — net selling of $165.6M. Since May 2018, Trabud has recorded 258 Form 4 filings for INSM: 12 buys ($4.0M) and 246 sells ($462.4M). Over the full record that is net selling of $458.5M.
How many insiders trade INSM stock?
19 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for INSMED Inc. The most recent filing was accepted on Sep 11, 2026.
Where does Trabud get INSM insider trading data?
All INSM insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.