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Company profile

INSMED Inc Insider Trading

INSM

Every SEC Form 4 insider trading filing for INSMED Inc (INSM) since April 2023: open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?

Exchange
Nasdaq
Sector
Pharmaceutical Preparations
CIK
0001104506
Filings
246
Insiders
16
Last filing
2026-09-09
SEC EDGAR ↗Yahoo Finance ↗Finviz ↗Stock Analysis ↗

Activity summary

Recent insider activity is bearish. Over the last 30 days, insiders net sold $3.1M across 1 transaction.

Three year balance

Buy and sell value by quarter, Q4 23 to Q3 26. INSMED Inc insiders were net sellers in every quarter shown.

PurchasesSales
Q4 23Q1 24Q2 24Q3 24Q4 24Q1 25Q2 25$65.6MQ3 25Q4 25Q1 26Q2 26Q3 26

Bars below the rule are sales, above are purchases. Largest quarter on the chart is $65.6M.

90 day insight

Over the last 90 days, INSMED Inc insiders sold $35.7M across 3 transactions with no open-market purchases.

  • Most active insider: William Lewis with 13 transactions totaling $2.9M.
  • Largest single sale: $32.0M by Roger Adsett on Aug 10, 2026.
  • 75% of recent sales were pre-scheduled 10b5-1 trades, typically less informative than open-market activity.

Activity skews bearish: sales outpace buys.

Insider Transactions

Sourced from SEC EDGAR Form 4 filings. Updated hourly.

Showing 5 of 50 transactions. The most significant are picked first.

DateInsiderCompanyTypeSharesPriceValueReturn
Sep 9, 2026David R BrennanINSM
Sale
25,000$124.00$3.10M-7.3% 1w
Aug 17, 2026Melvin Sharoky MDINSM
Sale
5,000$127.53$638K-6.9% 1m
Aug 10, 2026Roger AdsettINSM
Sale
239,850$133.27$31.96M-2.7% 1m
Jun 3, 2026Roger AdsettINSM
Sale
2,370$102.27$242K+34.0% 3m
Jun 3, 2026Michael Alexander SmithINSM
Sale
2,159$102.27$221K+34.0% 3m
Sale
$3.10M
David R BrennanSep 9, 2026
25,000 sh @ $124.00 · INSM-7.3% 1w
Sale
$638K
Melvin Sharoky MDAug 17, 2026
5,000 sh @ $127.53 · INSM-6.9% 1m
Sale
$31.96M
Roger AdsettAug 10, 2026
239,850 sh @ $133.27 · INSM-2.7% 1m
Sale
$242K
Roger AdsettJun 3, 2026
2,370 sh @ $102.27 · INSM+34.0% 3m
Sale
$221K
Michael Alexander SmithJun 3, 2026
2,159 sh @ $102.27 · INSM+34.0% 3m

45 more transactions hidden

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Top insiders

By open-market value traded.

Roger AdsettChief Operating Officer2 filings−$32.2M
William LewisChair and CEO11 filings−$5.2M
Martina M.D. FlammerChief Medical Officer5 filings−$5.0M
David R BrennanDirector1 filing−$3.1M
Melvin Sharoky MDDirector1 filing−$638K

Institutional Ownership

Top 13F-HR holders of INSMED Inc as of 2026-06-30

↓ decreasing
Total reported AUM
$3.81B
QoQ change
-86.7%
Reporting period
2026-06-30
#1
State Street Corp
CIK 0000093751
$645.3M
6.1M shares
#2
BlackRock, Inc.
CIK 0002012383
$635.9M
6.0M shares
#3
BlackRock, Inc.
CIK 0002012383
$587.7M
5.5M shares

Data source: quarterly 13F-HR filings: institutional holders report positions within 45 days of quarter end. Joined with insider activity above: see who's loading up institutionally while insiders are trading. Full 13F-HR API →

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Form4API, StockholmNot affiliated with the SEC or EDGAR. Data sourced from public EDGAR filings. Not investment advice.

Congressional Trading

Disclosed INSM trades under the STOCK Act

Total trades
7
Purchases
1
Sales
6
Gilbert Ray Cisneros, Jr.
Democrat · House · CA
0 buys
4 sells
Josh Gottheimer
Democrat · House · NJ
1 buy
2 sells

Sourced from U.S. House Clerk periodic transaction reports (House coverage only). Trade counts reflect disclosed filings only. The STOCK Act allows up to 45 days between a trade and its disclosure, so this reflects recent disclosures, not real-time trading. Full congressional trading API →

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