Insmed Ownership | Who Owns Insmed?

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Insmed Ownership Summary

Insmed is owned by 104.21% institutional investors, 0.51% insiders. Vanguard group is the largest institutional shareholder, holding 9.95% of INSM shares. JPM US Large Cap Growth-MA is the top mutual fund, with 4.88% of its assets in Insmed shares.

INSM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Insmed	104.21%	0.51%	-4.72%
Sector	Healthcare Stocks	50.50%	12.33%	37.17%
Industry	Biotech Stocks	49.09%	12.06%	38.85%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	21.08M	9.95%	$3.67B
Blackrock	14.26M	9.61%	$955.72M
Fmr	16.14M	7.49%	$1.72B
Blackrock funding, inc. /de	15.81M	7.34%	$1.69B
Jpmorgan chase	10.43M	4.84%	$1.09B
Vanguard capital management	9.79M	4.54%	$1.04B
Baker bros. advisors lp	8.80M	4.08%	$937.84M
Capital investors	8.24M	3.82%	$878.34M
Darwin global management	6.43M	2.98%	$673.60M
Ameriprise financial	6.18M	2.87%	$658.88M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Sio capital management	1.36M	24.71%	$91.30M
Darwin global management	6.43M	17.91%	$673.60M
Artia global partners lp	589.05K	11.59%	$62.80M
Davern capital partners, lp	559.82K	10.18%	$59.69M
Prosight management, lp	375.61K	6.90%	$40.05M
Eagle health investments lp	384.13K	6.79%	$40.96M
Integral health asset management	1.60M	6.74%	$170.59M
Cutter capital management, lp	186.38K	6.19%	$14.22M
Palo alto investors lp	413.98K	6.10%	$44.14M
Lion point capital, lp	6.25K	5.11%	$900.06K

Top Buyers

Holder	Shares	% Assets	Change
Orbis allan gray	6.08M	2.23%	4.20M
Norges bank	3.38M	0.04%	3.38M
Ameriprise financial	6.18M	0.13%	3.12M
Fmr	16.14M	0.07%	2.98M
Capital investors	8.24M	0.18%	2.64M

Top Sellers

Holder	Shares	% Assets	Change
Jpmorgan chase	10.43M	0.06%	-13.72M
Darwin global management	6.43M	17.91%	-10.37M
Invesco	368.26K	0.00%	-4.16M
Deep track capital, lp	-	-	-1.75M
Capital world investors	-	-	-1.36M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	3.38M	0.04%	3.38M	$360.12M
Maverick capital	2.15M	2.03%	2.15M	$229.31M
Sixth street partners management company	1.21M	0.02%	1.21M	$129.43M
Hrt financial lp	689.98K	0.13%	689.98K	$73.56M
Railway pension investments	604.70K	0.81%	604.70K	$64.47M

Sold Out

Holder	Change
Tfc financial management	-1.00
Country trust bank	-2.00
Frazier financial advisors	-2.00
Legacy wealth managment, llc/id	-3.00
Raleigh capital management	-4.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	710	0.28%	224,538,671	2.55%	104	0.99%	356	-11.00%	238	14.98%
Mar 31, 2026	509	-29.60%	116,330,719	-45.27%	54	0.54%	288	-34.40%	149	-19.89%
Dec 31, 2025	575	-7.41%	134,516,967	-36.21%	63	0.64%	353	8.62%	144	-28.36%
Sep 30, 2025	601	10.07%	209,660,324	4.31%	110	0.98%	317	12.01%	193	-1.03%
Jun 30, 2025	548	17.85%	210,291,427	6.07%	111	0.92%	279	16.25%	198	28.57%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
JPM US Large Cap Growth-MA	10.52M	4.88%	9.69M
Vanguard Morn Total Stk Mkt Idx Investor	6.89M	3.18%	22.12K
Vanguard Total Stock Mkt Idx Inv	6.89M	3.18%	22.12K
Vanguard US Total Market Shares ETF	5.46M	3.00%	368.94K
Capital Group Growth Fnd of Amer Comp	6.25M	2.89%	1.16M
American Funds Growth Fd of Amer A	6.25M	2.89%	1.16M
iShares Russell 2000 ETF	4.32M	2.41%	-
American Funds Growth Fund of Amer A	5.10M	2.36%	1.66M
Invesco QQQ Trust	4.68M	2.16%	22.05K
US Small-Cap Growth II Equity Comp	3.62M	1.90%	-996.88K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 10, 2026	Adsett Roger	Chief Operating Officer	Sell	$31.96M
Aug 06, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$2.37M
Aug 06, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$1.13M
Jul 23, 2026	Lewis William	Chair and CEO	Sell	$624.96K
Jul 23, 2026	Lewis William	Chair and CEO	Sell	$509.93K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	10
2026 Q2	-	42
2026 Q1	-	74
2025 Q4	-	41
2025 Q3	-	43

INSM Ownership FAQ

Who Owns Insmed?

Insmed shareholders are primarily institutional investors at 104.21%, followed by 0.51% insiders and -4.72% retail investors. The average institutional ownership in Insmed's industry, Biotech Stocks , is 49.09%, which Insmed exceeds.

Who owns the most shares of Insmed?

Insmed’s largest shareholders are Vanguard group (21.08M shares, 9.95%), Blackrock (14.26M shares, 9.61%), and Fmr (16.14M shares, 7.49%). Together, they hold 27.05% of Insmed’s total shares outstanding.

Does Blackrock own Insmed?

Yes, BlackRock owns 9.61% of Insmed, totaling 14.26M shares as of Jun 2024. This represents 0.02% of BlackRock's total assets, with a market value of 955.72M$. In the last quarter, BlackRock increased its holdings by 2.46M shares, a 20.89% change.

Who is Insmed’s biggest shareholder by percentage of total assets invested?

Sio capital management is Insmed’s biggest shareholder by percentage of total assets invested, with 24.71% of its assets in 1.36M Insmed shares, valued at 91.3M$.

Who is the top mutual fund holder of Insmed shares?

JPM US Large Cap Growth-MA is the top mutual fund holder of Insmed shares, with 4.88% of its total shares outstanding invested in 10.52M Insmed shares.

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