$INSM

$93.33 -$0.06 (0.06%) Close

$INSM Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 218.4M shares outstanding

Who owns INSM?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 44.7%

Jpmorgan Chase & Co 4.8% · Darwin Global Management, Ltd. 2.9%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

666

-10 vs last qtr

Net shares bought

+2.1M

by institutions in Q2 2026

New / sold out

119 / 129

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Orbis Allan Gray Ltd +4.2M
Norges Bank NEW +3.4M

Biggest sellers in Q2 2026

Jpmorgan Chase & Co −13.7M
Darwin Global Management, Ltd. −10.4M

Who is planning to sell?

Notices of proposed sale, last 12 months

$167M

72 notices from 11 people

Shares covered

1.1M

0.50% of the company

Arranged in advance

55%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Roger Adsett Officer $48.2M
William Lewis Officer $32.8M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+221.6%

+13.86% a year

Each share's claim on the business

−68.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $554M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years58% 3–5 years7% 1–3 years22% Under 1 year13%

Quarterly turnover

21.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting INSM on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
JC Jpmorgan Chase & Co	10.4M	4.78%	−13.7M (−56.8%)	≤2021	0.1%
Shares held by quarter Peak holding24.2M (Q1'26) Change over 8 quarters+7.1M Share of the company4.780% Jpmorgan Chase & Co's full portfolio →
DG Darwin Global Management, Ltd.	6.4M	2.94%	−10.4M (−61.7%)	2024	17.9%
Shares held by quarter Peak holding20.9M (Q4'25) Change over 8 quarters−4.1M Share of the company2.940% Darwin Global Management, Ltd.'s full portfolio →

Jpmorgan Chase & Co

10.4M

% of company

4.78%

Change vs last qtr

−13.7M (−56.8%)

Held since

≤2021

Darwin Global Management, Ltd.

6.4M

% of company

2.94%

Change vs last qtr

−10.4M (−61.7%)

Held since

2024

28 more super investors behind a free account

See every manager holding Insmed Incorporated, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting INSM on Form N-PORT; together they hold 41.9% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IQ Invesco QQQ Trust, Series 1 Invesco QQQ Trust, Series 1	$743M	4.5M	2.08%	0.20%	March 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$734M	6.9M	3.15%	0.03%	June 30, 2026

Invesco QQQ Trust, Series 1

Position value

$743M

% of company

2.08%

% of the fund

0.20%

As of

March 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$734M

% of company

3.15%

% of the fund

0.03%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Insmed Incorporated and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
LW Lewis William Insider	1.3M	0.62%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.620% Lewis William's insider activity →
SM Sharoky Melvin MD Insider	330.1K	0.15%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.150% Sharoky Melvin MD's insider activity →

Lewis William

Insider

1.3M

% of company

0.62%

Change vs last qtr

—

Held since

—

Sharoky Melvin MD

Insider

330.1K

% of company

0.15%

Change vs last qtr

—

Held since

—

15 more holders behind a free account

See every insider and 5%+ holder of Insmed Incorporated.

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