By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
Over the past year there were no insider purchases at INSMED Inc. Ten insiders sold roughly $167.1 million instead.
Keep in mind most insider selling is routine — stock-based pay has to be converted to cash at some point.
On the institutional side, 665 funds reported holding INSM at the end of Q2 2026, and funds were split between buying and selling. INSM also shows up in congressional disclosures: 7 reported trades from two lawmakers in two years. Looking at the quarterly pattern: 7 quarters in a row of net selling by insiders. Insiders bought in 1 of the last 7 full quarters.
Are insiders buying or selling INSM stock?
In the last 12 months INSMED Inc insiders made open-market purchases worth about $0 and sales worth about $167.1 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in INSM?
The most recent open-market insider trade in INSM was filed on 2026-09-11.
How many institutions own INSM?
665 investment managers reported holding INSM in SEC Form 13F filings for Q2 2026.
Has any member of Congress traded INSM?
Yes. Members of Congress reported 7 trades in INSM over the past two years. The full list is free on CapitalSnitch.
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Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).