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INSM Institutional Ownership & 13F Holders | SmartMoneyDB

INSMINSMED INC

COM PAR $.01 · CUSIP 457669307

Smart Money Ownership

Of the 16 tracked institutions holding INSM, 9 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +6.7pt. It's a gauge of who owns the name, not just how many.

Stanley Druckenmiller

$188.7M · 6.4% of book

$356.9M · 0.3% of book

+6.7pt

INSM (INSMED INC) Institutional Ownership Summary

Among the 16 tracked institutional investors we monitor, INSM (INSMED INC) is held with a combined value of $12.31B across 73,951,039 shares. The largest holder is VANGUARD GROUP INC with a position worth $3.67B (0.05% of their portfolio). Bridgewater Associates, LP opened a new position in the most recent quarter. 9 funds increased their holdings. 6 funds reduced their position.

Total Institutional Value

$12.31B

Total Shares Held

73,951,039

Institutional Holders

% of Shares Outstanding

34.1%

of 216.75M shares · SEC 2026-05-01

Days to Cover

4.8-27.5%

11.62M shares short · FINRA 2026-07-15

Tracked 13F institutions hold 34.1% of INSM's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-05-01), not a live float.

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

FMR LLC+33% shares~$529.1M BlackRock, Inc.+11% shares~$263.6M VANGUARD GROUP INC+6% shares~$197.8M CITADEL ADVISORS LLC+89% shares~$167.7M BAKER BROS. ADVISORS LP+13% shares~$135.8M

13F Institutional Holders

Sort

BAKER BROS. ADVISORS LP

PRICE T ROWE ASSOCIATES INC /MD/

MILLENNIUM MANAGEMENT LLC

0.09% of book-1.4%

$211.77M

Duquesne Family Office LLC

6.43% of book-22.1%

$188.72M

ADAGE CAPITAL PARTNERS GP, L.L.C.

0.23% of book+200.0%

$147.17M

#	Fund	Value↓	Shares	Portfolio %	Change
1	VANGUARD GROUP INC	$3.67B	21,076,344	0.05%	+5.7%
2	BlackRock, Inc.	$2.73B	16,678,146	0.05%	+10.7%
3	FMR LLC	$2.15B	13,160,167	0.11%	+32.6%
4	BAKER BROS. ADVISORS LP	$1.21B	7,421,111	6.97%	+12.6%
5	STATE STREET CORP	$907.81M	5,551,699	0.03%	+6.7%
6	PRICE T ROWE ASSOCIATES INC /MD/	$505.74M	3,092,807	0.06%	-23.4%
7	CITADEL ADVISORS LLC	$356.89M	2,182,571	0.25%	+88.6%
8	MILLENNIUM MANAGEMENT LLC	$211.77M	1,295,086	0.09%	-1.4%
9	Duquesne Family Office LLC	$188.72M	1,154,090	6.43%	-22.1%
10	ADAGE CAPITAL PARTNERS GP, L.L.C.	$147.17M	900,000	0.23%	+200.0%

Congress Trading

2 members · 7 disclosed trades in INSM

Member	Type	Amount	Date
Josh Gottheimer	Sell	$1,001 - $15,000	Jun 10, 2026
Gilbert Cisneros	Sell	$1,001 - $15,000	Aug 8, 2025
Gilbert Cisneros	Sell	$1,001 - $15,000	Jul 7, 2025
Josh Gottheimer	Buy	$1,001 - $15,000

Frequently Asked Questions

Which institutional investors own the most INSM stock?

As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of INSM with a position worth $3.67B, representing 0.05% of their portfolio. In total, 16 institutional investors hold INSM with a combined value of $12.31B.

Are hedge funds buying or selling INSM?

In the most recent quarter, 1 fund opened a new position in INSM. Additionally, 9 increased their holdings and 6 reduced their positions.

What percentage of INSM is owned by institutional investors?

Institutional investors hold $12.31B worth of INSM stock across 16 positions. The largest institutional holder is VANGUARD GROUP INC with $3.67B in holdings.

What is a 13F filing and why does it matter for INSM?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For INSM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track INSM institutional moves

Get notified when hedge funds change their INSM positions.