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 49 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 ·

202410 of 30 preview events · 49 available in 2024

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 19, 2024	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$1.31M 18,750 shares sold	4.64% sold Direct holding	▾
Dec 19, 2024	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$477.55K 6,830 shares sold	2.84% sold Trust holding	▾
Dec 12, 2024	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$1.37M 18,750 shares sold	4.64% sold Direct holding	▾
Dec 12, 2024	Lewis William Chair and CEO · Director	Sale10b5-1 footnote	$498.46K 6,830 shares sold	2.84% sold Trust holding	▾
Sep 16, 2024	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$1.01M 13,436 shares sold	11.24% sold Direct holding	▾
Sep 13, 2024	Smith Michael Alexander Chief Legal Officer	Sale10b5-1 footnote	$2.07M 27,871 shares sold	29.12% sold Direct holding	▾
Sep 13, 2024	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$2.02M 26,969 shares sold	20.26% sold Direct holding	▾
Sep 12, 2024	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$47.57K 635 shares sold	0.59% sold Direct holding	▾
Sep 10, 2024	Schaeffer Orlov S Nicole Chief People Strategy Officer	Sale10b5-1 footnote	$2.69M 37,575 shares sold	27.29% sold Direct holding	▾
Sep 6, 2024	Flammer Martina M.D. Chief Medical Officer	Sale10b5-1 footnote	$10.61M 149,002 shares sold	58.40% sold Direct holding	▾

Showing 30 / 49 record groups in 2024. 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 49 purchase / sale groups and 30 of 112 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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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.