Person · CIK 1609305

David R Brennan

Director at INSMED

Earlier: Alexion Pharmaceuticals and Innocoll Holdings

Source: Forms 3, 4, 5 and 144 on SEC EDGAR

Sold on Form 4$3.1M

Noticed on Form 144$3.1M

Bought on Form 4$395K

Companies3

Holdings now

As reported after the latest Form 3, 4 or 5 at each company.

How these figures work

Options and RSUs are from the latest filing that lists them; earlier grants may also be held. Holdings can be out of date when a person stops filing.

Company	Security	Held	Shares or units	As of
INSMED INSM	Common Stock	Directly	39,238	Sep 9, 2026 · Filing · EDGAR
INSMED INSM	Common Stock	By spouse revocable trust	60,000	Sep 9, 2026 · Filing · EDGAR

Sold and noticed by quarter

Sold (Form 4) Noticed (Form 144) Bought (Form 4)

Quarterly totals as a table

Quarter	Sold (Form 4)	Noticed (Form 144)	Bought (Form 4)
Q3 2026	$3.1M	$3.1M	—
Q4 2021	—	—	$302K
Q4 2014	—	—	$93K

Planned sales (Form 144) and the sales that followed

Each Form 144 notice of a planned sale, grouped by broker and 10b5-1 plan, with the Form 4 sales we matched to it.

How we match

A Form 144 is a notice of a planned sale by an affiliate. SEC Tracker matches each notice to Form 4 sales by the same person at the same company within 90 days of the notice, up to the shares noticed. The match is our inference, not something either filing states.

Notice date	Noticed	Planned sale	Outcome	Links
INSMED INSM · Wells Fargo Clearing Services · No 10b5-1 plan stated · 1 notice
Sep 10, 2026	25,000 · ~$3.1M	Sep 9, 2026	Sold as noticed Sold 25,000 at $124.00 on Sep 9 · $3.1M Form 4	Filing · EDGAR

Every transaction, by company

Each Form 3, 4 and 5 transaction in plain words, newest first.

How these figures work

Values are shares times the price each filing states; grants, exercises and gifts usually state no price. Held after is what the filing reports was held once the transaction was done, directly or through the named holder.

INSMED INSM Director · filings 2014 to 2026 · sold $3.1M · bought $302K · $3.1M noticed on Form 144

Date	Transaction	Shares	Price	Value	Held after	Source
Sep 9, 2026	Open-market or private sale	−25,000	$124.00	$3.1M	39,238 direct	Filing · EDGAR
May 13, 2026	Grant or award from the company	+3,305			64,238 direct	Filing · EDGAR
Feb 23, 2026	Gift	−6,000			60,933 direct	Filing · EDGAR
Nov 6, 2025	Gift	−60,000			66,933 direct	Filing · EDGAR
Nov 6, 2025	Gift	+60,000			60,000 By spouse revocable trust	Filing · EDGAR
May 15, 2025	Grant or award from the company	+5,058			126,933 direct	Filing · EDGAR
May 13, 2024	Grant or award from the company	+13,162			121,875 direct	Filing · EDGAR
May 11, 2023	Grant or award from the company	+13,192			108,713 direct	Filing · EDGAR
May 11, 2022	Grant or award from the company	+14,645			95,521 direct	Filing · EDGAR
Nov 1, 2021	Open-market or private purchase	+10,000	$30.15	$302K	80,876 direct	Filing · EDGAR
May 12, 2021	Grant or award from the company	+7,558			70,876 direct	Filing · EDGAR
May 12, 2020	Grant or award from the company	+8,097			63,318 direct	Filing · EDGAR
May 15, 2019	Grant or award from the company	+6,899			55,221 direct	Filing · EDGAR
May 15, 2018	Grant or award from the company	+6,066			48,322 direct	Filing · EDGAR
May 17, 2017	Grant or award from the company	+6,702			42,256 direct	Filing · EDGAR
May 29, 2015	Option or RSU exercised or converted	+2,690			22,812 direct	Filing · EDGAR
May 29, 2015	Option or RSU exercised or converted Restricted Stock Units	−2,690			0 direct	Filing · EDGAR
May 19, 2015	Grant or award from the company	+12,742			35,554 direct	Filing · EDGAR
Jan 8, 2015	Grant or award from the company	+6,222			20,122 direct	Filing · EDGAR
May 29, 2014	Grant or award from the company Restricted Stock Units	+2,690			2,690 direct	Filing · EDGAR

Alexion Pharmaceuticals Director · filings 2014 to 2021 · bought $93K

Date	Transaction	Shares	Price	Value	Held after	Source
Jul 21, 2021	Returned to the company	−20,873			0 direct	Filing · EDGAR
Jul 21, 2021	Returned to the company Option to Purchase Common Stock	−2,343	$155.01	$363K	0 direct	Filing · EDGAR
Jul 21, 2021	Returned to the company Option to Purchase Common Stock	−2,706	$167.97	$455K	0 direct	Filing · EDGAR
Jul 21, 2021	Returned to the company Option to Purchase Common Stock	−2,294	$138.86	$319K	0 direct	Filing · EDGAR
May 20, 2021	Grant or award from the company	+1,962			19,499 direct	Filing · EDGAR
May 20, 2021	Grant or award from the company	+1,374			20,873 direct	Filing · EDGAR
May 14, 2020	Grant or award from the company	+3,468			15,109 direct	Filing · EDGAR
May 14, 2020	Grant or award from the company	+2,428			17,537 direct	Filing · EDGAR
May 15, 2019	Grant or award from the company	+2,726			9,733 direct	Filing · EDGAR
May 15, 2019	Grant or award from the company	+1,908			11,641 direct	Filing · EDGAR
May 9, 2018	Grant or award from the company	+2,174			7,007 direct	Filing · EDGAR
May 10, 2017	Grant or award from the company	+2,030			4,833 direct	Filing · EDGAR
May 11, 2016	Grant or award from the company	+835			2,803 direct	Filing · EDGAR
May 11, 2016	Grant or award from the company Option to Purchase Common Stock	+2,294	$138.86	$319K	2,294 direct	Filing · EDGAR
May 6, 2015	Grant or award from the company	+700			1,968 direct	Filing · EDGAR
May 6, 2015	Grant or award from the company Option to Purchase Common Stock	+2,343	$155.01	$363K	2,343 direct	Filing · EDGAR
Dec 15, 2014	Open-market or private purchase	+500	$186.99	$93K	1,268 direct	Filing · EDGAR
Jul 22, 2014	Grant or award from the company	+768			768 direct	Filing · EDGAR
Jul 22, 2014	Grant or award from the company Option to Purchase Common Stock	+2,706	$167.97	$455K	2,706 direct	Filing · EDGAR

Innocoll Holdings Director · filings 2017 to 2017

Date	Transaction	Shares	Source
Jul 24, 2017	Returned to the company	−237,440	Filing · EDGAR
Jul 24, 2017	Returned to the company Stock Option (right to buy)	−11,659	Filing · EDGAR
Jul 24, 2017	Returned to the company Stock Option (right to buy)	−8,230	Filing · EDGAR
Jul 24, 2017	Returned to the company Stock Option (right to buy)	−14,907	Filing · EDGAR

All 33 Forms 3, 4, 5 and 144

Filed	Form	Company	Links
Sep 11, 2026	Form 4	INSMED INSM	Filing · EDGAR
Sep 10, 2026	Form 144	INSMED INSM	Filing · EDGAR
May 15, 2026	Form 4	INSMED INSM	Filing · EDGAR
Feb 25, 2026	Form 4	INSMED INSM	Filing · EDGAR
Nov 10, 2025	Form 4	INSMED INSM	Filing · EDGAR
May 19, 2025	Form 4	INSMED INSM	Filing · EDGAR
May 15, 2024	Form 4	INSMED INSM	Filing · EDGAR
May 15, 2023	Form 4	INSMED INSM	Filing · EDGAR
May 13, 2022	Form 4	INSMED INSM	Filing · EDGAR
Nov 3, 2021	Form 4	INSMED INSM	Filing · EDGAR
Jul 23, 2021	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
May 24, 2021	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
May 14, 2021	Form 4	INSMED INSM	Filing · EDGAR
May 18, 2020	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
May 14, 2020	Form 4	INSMED INSM	Filing · EDGAR
May 17, 2019	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
May 16, 2019	Form 4	INSMED INSM	Filing · EDGAR
May 17, 2018	Form 4	INSMED INSM	Filing · EDGAR
May 11, 2018	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jul 26, 2017	Form 4	Innocoll Holdings	Filing · EDGAR
May 19, 2017	Form 4	INSMED INSM	Filing · EDGAR
May 12, 2017	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jan 3, 2017	Form 3	Innocoll Holdings	Filing · EDGAR
May 23, 2016	Form 4	INSMED INSM	Filing · EDGAR
May 19, 2016	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jun 2, 2015	Form 4	INSMED INSM	Filing · EDGAR
May 8, 2015	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jan 9, 2015	Form 4	INSMED INSM	Filing · EDGAR
Dec 16, 2014	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jul 24, 2014	Form 4	Alexion Pharmaceuticals	Filing · EDGAR
Jul 24, 2014	Form 3	Alexion Pharmaceuticals	Filing · EDGAR
Jun 2, 2014	Form 4	INSMED INSM	Filing · EDGAR
Jun 2, 2014	Form 3	INSMED INSM	Filing · EDGAR

Every figure is as filed with the SEC on Forms 3, 4, 5 and 144. Holdings are the amounts reported after each person's latest filing at each company and can be out of date. Matching a Form 144 notice to Form 4 sales is SEC Tracker's inference from owner, company, dates and share counts, not something the filings state. Not investment advice. Not affiliated with the U.S. SEC.