INSMHealthcareLarge-Cap
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 Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are INSM insiders buying or selling?
INSMED Inc insiders reported 12 open-market buys ($4.0M) and 245 sells ($459.3M) across 257 Form 4 filings — a net selling position of $455.4M.
Source: SEC EDGAR Form 4
Key Statistics (as of Aug 19, 2026)
Total Form 4 filings
257
SEC EDGAR
Insider filers
19
Insider buys (12)
$4.0M
Insider sells (245)
$459.3M
Insider sentiment
Net sellingNet insider flow of $455.4M in net selling.
Recent INSM insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 19, 2026 | Melvin Sharoky MD | Director | Sale | 5.0K | $127.53 | $637.6K |
| Aug 12, 2026 | Roger Adsett | Chief Operating Officer | Sale | 239.8K | $133.27 | $32.0M |
| Aug 7, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 27.2K | $128.61 | $3.5M |
| Jul 24, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $106.06 | $1.1M |
| Jul 10, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $117.40 | $1.3M |
| Jul 8, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 12.3K | $109.98 | $1.4M |
| Jun 26, 2026 | William Lewis | Chair and CEO | Sale | 21.4K | $103.32 | $2.2M |
| Jun 24, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 1.8K | $95.82 | $173.1K |
| Jun 10, 2026 | William Lewis | Chair and CEO | Sale | 6.5K | $94.03 | $612.6K |
| Jun 5, 2026 | Roger Adsett | Chief Operating Officer | Sale | 2.4K | $102.27 | $242.4K |
| Jun 5, 2026 | Sara Bonstein | Chief Financial Officer | Sale | 2.4K | $102.27 | $245.9K |
| Jun 5, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 2.2K | $102.27 | $220.8K |
| Jun 5, 2026 | William Lewis | Chair and CEO | Sale | 7.6K | $102.27 | $777.8K |
| Jun 5, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 4.4K | $102.90 | $455.2K |
| May 22, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 6.1K | $108.47 | $667.0K |
| May 20, 2026 | William Lewis | Chair and CEO | Sale | 25.6K | $106.33 | $2.7M |
| May 15, 2026 | Sara Bonstein | Chief Financial Officer | Sale | 8.3K | $116.18 | $961.0K |
| May 15, 2026 | Roger Adsett | Chief Operating Officer | Sale | 5.8K | $116.18 | $678.1K |
| May 15, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 18.3K | $116.12 | $2.1M |
| May 15, 2026 | Michael Alexander Smith | Chief Legal Officer | Sale | 4.1K | $116.18 | $477.4K |
| May 15, 2026 | William Lewis | Chair and CEO | Sale | 13.3K | $116.18 | $1.5M |
| May 13, 2026 | Martina M.D. Flammer | Chief Medical Officer | Sale | 12.9K | $100.40 | $1.3M |
| May 6, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $137.34 | $1.5M |
| Apr 17, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $143.97 | $1.5M |
| Apr 8, 2026 | William Lewis | Chair and CEO | Sale | 10.7K | $163.22 | $1.7M |
Showing the 25 most recent of 257 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?
Across 257 SEC Form 4 filings, INSMED Inc (INSM) insiders reported 12 open-market purchases totaling $4.0M and 245 sales totaling $459.3M. That is a net selling position of $455.4M.
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 Aug 19, 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.
Looking for another company? Browse all tracked companies.