Company · Ownership research

INSMED Inc INSM

CIK 0001104506

Form 4 transactions dated Nov 1, 2023 to Nov 11, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 62 rows; the complete set is available through the API.

Insider filings on file run through Oct 20, 2026.

Insider purchases & sales

Purchased: $201.69K
Sold: $403.92M

Nov 1, 2023 – Oct 20, 2026
Available records · partial months are marked ·

202610 of 30 preview events · 62 available in 2026

Date	Insider	Activity	Trade value (USD)	% of prior holding
Sep 9, 2026	Brennan David R Director	Sale	$3.10M 25,000 shares sold	38.92% sold Direct holding	▾
Aug 17, 2026	SHAROKY MELVIN MD Director	Sale	$637.65K 5,000 shares sold	100.00% sold LLC holding	▾
Aug 10, 2026	Adsett Roger Chief Operating Officer	Sale	$31.96M 239,850 shares sold	70.84% sold Direct holding	▾
Aug 6, 2026	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$3.49M 27,173 shares sold	31.00% sold Direct holding	▾
Jul 23, 2026	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$1.13M 10,700 shares sold	3.97% sold Direct holding	▾
Jul 9, 2026	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$1.26M 10,699 shares sold	3.97% sold Direct holding	▾
Jul 6, 2026	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$1.35M 12,302 shares sold	16.90% sold Direct holding	▾
Jun 25, 2026	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$2.21M 21,398 shares sold	7.63% sold Direct holding	▾
Jun 22, 2026	Smith Michael Alexander Chief Legal Officer	Sale10b5-1 footnote	$173.05K 1,806 shares sold	4.58% sold Direct holding	▾
Jun 8, 2026	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$612.61K 6,515 shares sold	2.45% sold Direct holding	▾

Showing 30 / 62 record groups in 2026. The complete set is available through the API.

INSMED Inc · INSM

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 30 of 62 purchase / sale groups and 30 of 98 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"INSM","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.