Insmed Incorporated
Insmed Incorporated (INSM) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · INSM · as of Jun 8, 2026
Activity summary
Buy transactions
0
P-Purchase only
Sell transactions
193
12 Months
Buy/Sell ratio
0.00
Buy/Sell (by trades)
Overall sentiment
Insmed Incorporated insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 8, 2026
INSM insider buying and selling by quarter
INSM insider selling · INSM insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 8, 2026
Active insiders
Most active in past 12 months · INSM ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
INSM executive sell shares · INSM board member insider trading · INSM insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Jun 3, 2026 | Adsett Roger COO | Sale | 2,370 | $242K | Form 4 |
| Jun 3, 2026 | Bonstein Sara CFO | Sale | 2,404 | $246K | Form 4 |
| Jun 3, 2026 | Smith Michael Alexander Chief Legal Officer | Sale | 2,159 | $221K | Form 4 |
| Jun 3, 2026 | Lewis William Chair and CEO · Director | Sale | 7,605 | $778K | Form 4 |
| Jun 3, 2026 | Flammer Martina M.D. Chief Medical Officer | Sale | 2,566 | $262K | Form 4 |
| Jun 5, 2026 | Flammer Martina M.D. Chief Medical Officer | Sale | 1,858 | $193K | Form 4 |
| May 22, 2026 | Smith Michael Alexander Chief Legal Officer | Sale | 6,149 | $667K | Form 4 |
| May 18, 2026 | Lewis William Chair and CEO · Director | Option | 4,440 | $76K | Form 4 |
| May 18, 2026 | Lewis William Chair and CEO · Director | Option | 6,259 | $191K | Form 4 |
| May 18, 2026 | Lewis William Chair and CEO · Director | Sale | 5,753 | $606K | Form 4 |
| May 18, 2026 | Lewis William Chair and CEO · Director | Sale | 11,836 | $1.26M⚡ | Form 4 |
| May 18, 2026 | Lewis William Chair and CEO · Director | Sale | 7,975 | $853K | Form 4 |
| May 13, 2026 | Bonstein Sara CFO | Sale | 8,272 | $961K | Form 4 |
| May 13, 2026 | SCHAFER CAROL Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | Adsett Roger COO | Sale | 5,837 | $678K | Form 4 |
| May 13, 2026 | ANDERSON ELIZABETH M Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | Flammer Martina M.D. Chief Medical Officer | Sale | 4,470 | $504K | Form 4 |
| May 13, 2026 | Flammer Martina M.D. Chief Medical Officer | Sale | 3,384 | $393K | Form 4 |
| May 14, 2026 | Flammer Martina M.D. Chief Medical Officer | Sale | 10,479 | $1.23M⚡ | Form 4 |
| May 13, 2026 | Smith Michael Alexander Chief Legal Officer | Sale | 4,109 | $477K | Form 4 |
| May 13, 2026 | SHAROKY MELVIN MD Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | Brennan David R Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | Desjardins Clarissa Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | LEE LEO Director | Award | 3,305 | — | Form 4 |
| May 13, 2026 | Lewis William Chair and CEO · Director | Sale | 13,283 | $1.54M⚡ | Form 4 |
Smith Michael Alexander
Chief Legal Officer
Date
Jun 3
Shares
2,159
Price
$102.27
Value
$221K
Lewis William
Chair and CEO · Director
Date
Jun 3
Shares
7,605
Price
$102.27
Value
$778K
Flammer Martina M.D.
Chief Medical Officer
Date
Jun 3
Shares
2,566
Price
$102.27
Value
$262K
Flammer Martina M.D.
Chief Medical Officer
Date
Jun 5
Shares
1,858
Price
$103.78
Value
$193K
Smith Michael Alexander
Chief Legal Officer
Date
May 22
Shares
6,149
Price
$108.47
Value
$667K
Lewis William
Chair and CEO · Director
Date
May 18
Shares
4,440
Price
$17.16
Value
$76K
Lewis William
Chair and CEO · Director
Date
May 18
Shares
6,259
Price
$30.46
Value
$191K
Lewis William
Chair and CEO · Director
Date
May 18
Shares
5,753
Price
$105.32
Value
$606K
Lewis William
Chair and CEO · Director
Date
May 18
Shares
11,836
Price
$106.39
Value
$1.26M ⚡
Lewis William
Chair and CEO · Director
Date
May 18
Shares
7,975
Price
$106.97
Value
$853K
Flammer Martina M.D.
Chief Medical Officer
Date
May 13
Shares
4,470
Price
$112.76
Value
$504K
Flammer Martina M.D.
Chief Medical Officer
Date
May 13
Shares
3,384
Price
$116.18
Value
$393K
Flammer Martina M.D.
Chief Medical Officer
Date
May 14
Shares
10,479
Price
$117.54
Value
$1.23M ⚡
Smith Michael Alexander
Chief Legal Officer
Date
May 13
Shares
4,109
Price
$116.18
Value
$477K
Lewis William
Chair and CEO · Director
Date
May 13
Shares
13,283
Price
$116.18
Value
$1.54M ⚡
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About INSM insider trading
INSM insider trades
Insmed Incorporated (INSM) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Lewis William (Chair and CEO · Director), Smith Michael Alexander (Chief Legal Officer), Flammer Martina M.D. (Chief Medical Officer). Over the past 12 months, 5 insiders have filed transactions with the SEC. INSM insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Insmed Incorporated's institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
INSM insider trading · 5 questionsThe insiders of Insmed Incorporated (INSM) include executives and directors such as Lewis William (Chair and CEO · Director), Smith Michael Alexander (Chief Legal Officer), Flammer Martina M.D. (Chief Medical Officer), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026