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Insmed Incorporated

Health CareRussell 2000

Insmed Incorporated insider trading

Insmed Incorporated files with the SEC as a Pharmaceutical Preparations company headquartered in Bridgewater, NJ. Every time one of its executives or directors buys or sells the stock, the filing appears here the moment it reaches the SEC — with grants and option exercises set apart from the trades that cost the insider their own money.

From SEC filings

Recent INSM insider transactions

7 insiders traded INSM on the open market between Jun 03, 2026 and Sep 09, 2026 — 24 sales worth $47.6M, of which 17 were pre-scheduled under a 10b5-1 plan.

Bought
—
Sold
$47.6M

17 of 24 on a 10b5-1 plan

Net
−$47.6M
Insiders
7

Open-market purchases (code P) and sales (code S) from Insmed Incorporated's own SEC Form 4 filings. Grants and option exercises are excluded — they are compensation, not decisions. Share counts are derived from the reported value and price. Verify any figure against the original filing before acting on it; this is monitoring, not advice.

Filing history last read from EDGAR on Sep 23, 2026. The live dashboard shows new filings the moment they clear.

Every INSM Form 4 on SEC.gov

SEC Form 4 data, Q3 2024 to Q2 2026

INSM insider trading by quarter

Between Jul 01, 2024 and Jun 30, 2026, 12 insiders traded INSM on the open market: 2 purchases worth $201.7K and 380 sales worth $326.7M, 296 of the sales pre-scheduled under a 10b5-1 plan. In the last four quarters alone: 0 purchases and 200 sales ($189.8M), by 9 insiders.

QuarterBoughtSold
Q2 2026—−$34.7M42 sales · 34 on a plan
Q1 2026—−$45.2M74 sales · 58 on a plan
Q4 2025—−$44.3M41 sales · 29 on a plan
Q3 2025—−$65.6M43 sales · 35 on a plan
Q2 2025+$201.7K2 buys−$54.6M70 sales · 52 on a plan
Q1 2025—−$53M87 sales · 68 on a plan
Q4 2024—−$3.7M10 sales · all on a plan
Q3 2024—−$25.6M13 sales · 10 on a plan
Largest purchase
+$126.7K of INSM by Desjardins Clarissa (Director) on May 20, 2025.
Largest sale
−$10.3M of INSM by Adsett Roger (Chief Operating Officer) on Apr 01, 2026, under a 10b5-1 plan.

Open-market transactions through Jun 30, 2026most recent first

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$262.4K

    Jun 03, 2026

    2,566 sh · $102.27

  • Smith Michael Alexander10b5-1

    Chief Legal Officer

    −$667K

    May 22, 2026

    6,149 sh · $108.47

  • Lewis William10b5-1

    Chair and CEO · Director

    −$1.3M

    May 18, 2026

    11,836 sh · $106.39

  • Lewis William10b5-1

    Chair and CEO · Director

    −$853.1K

    May 18, 2026

    7,975 sh · $106.97

  • Lewis William10b5-1

    Chair and CEO · Director

    −$605.9K

    May 18, 2026

    5,753 sh · $105.32

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$1.2M

    May 14, 2026

    10,479 sh · $117.54

  • Lewis William

    Chair and CEO · Director

    −$1.5M

    May 13, 2026

    13,283 sh · $116.18

  • Bonstein Sara

    Chief Financial Officer

    −$961K

    May 13, 2026

    8,272 sh · $116.18

  • Adsett Roger

    Chief Operating Officer

    −$678.1K

    May 13, 2026

    5,837 sh · $116.18

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$504K

    May 13, 2026

    4,470 sh · $112.76

  • Smith Michael Alexander

    Chief Legal Officer

    −$477.4K

    May 13, 2026

    4,109 sh · $116.18

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$393.2K

    May 13, 2026

    3,384 sh · $116.18

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$1.2M

    May 11, 2026

    12,119 sh · $100.35

  • Flammer Martina M.D.10b5-1

    Chief Medical Officer

    −$84K

    May 11, 2026

    830 sh · $101.18

  • Lewis William10b5-1

    Chair and CEO · Director

    −$728.6K

    May 04, 2026

    5,318 sh · $137.01

From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.

Insmed Incorporated company record

SEC industry classification
Pharmaceutical Preparations
Headquarters
Bridgewater, NJ
Incorporated in
VA
Listed on
Nasdaq
SEC Central Index Key
0001104506

Sourced from this company's own SEC submissions record. The industry label is SEC's Standard Industrial Classification, which is more specific than the Health Care sector shown above.

After insiders bought INSM

What the stock actually did in the 90 days following each open-market purchase

Don't check INSM — let it ping you

Get told the moment an insider moves on INSM

Pro watches Insmed Incorporated for you and sends a Telegram ping within moments of a Form 4 clearing EDGAR — a C-suite open-market buy, a cluster, a 10b5-1 regime break — long before it reaches the press. Add INSM to a watchlist, see each mover's benchmark-measured track record and which legendary funds hold it, and read the full filing history instead of the last 72 hours.

Track INSM on the live dashboardFilings on SEC.gov

The live dashboard is free to open. Alerts, watchlists, full filing history and each mover's benchmark-measured track record are Pro. Monitoring, not advice.

How to read INSM insider activity

Open-market purchase (code P)
An insider spending their own money at market price. This is the only buy code that reliably carries signal — it is a decision, not compensation.
Grants and option exercises (codes A, M)
Scheduled compensation. Most "insider buying" headlines are really this, which is why InsiderPulse weights it at a fraction of a real purchase.
Cluster buy
Two or more different insiders buying on the open market in the same window. One executive buying can mean anything; three is much harder to explain away.

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This week on the tape: who actually chose to sellThe weekly split of scheduled 10b5-1 selling vs deliberate sales, with the deciders named.

Questions

Are INSM insiders buying or selling?
Between Jun 03, 2026 and Sep 09, 2026, 7 Insmed Incorporated insiders made no open-market purchases and 24 sales worth $47.6M, a net sale of $47.6M. 17 of the sales were pre-scheduled under a Rule 10b5-1 plan.
How much INSM stock have insiders bought and sold in the last two years?
Between Jul 01, 2024 and Jun 30, 2026, 12 Insmed Incorporated insiders made 2 open-market purchases worth $201.7K and 380 sales worth $326.7M. 296 of the sales were pre-scheduled under a Rule 10b5-1 plan. In the four quarters to Jun 30, 2026: no purchases and 200 sales ($189.8M). The largest purchase was Desjardins Clarissa buying $126.7K on May 20, 2025. The largest sale was Adsett Roger selling $10.3M on Apr 01, 2026.
What was the largest recent INSM insider trade?
Adsett Roger (Chief Operating Officer) sold $32M of INSM stock on Aug 10, 2026 at about $133.27 a share.
When did an insider last buy INSM shares?
No open-market purchase by a Insmed Incorporated insider appears in the filings from Jun 03, 2026 to Sep 09, 2026 — every recorded open-market transaction in that period was a sale. Before that, the most recent purchase in SEC's data was Desjardins Clarissa buying $75K on May 21, 2025.
Where does INSM insider trading data come from?
From the Form 4 filings Insmed Incorporated's officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.

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