Insmed Ownership | Who Owns Insmed?

Overview Forecast RevenueFinancials Chart Transcripts

Insmed Ownership Summary

Insmed is owned by 110.75% institutional investors, 0.61% insiders. Jpmorgan chase is the largest institutional shareholder, holding 12.18% of INSM shares. JPMorgan Large Cap Growth I is the top mutual fund, with 3.36% of its assets in Insmed shares.

INSM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Insmed	110.75%	0.61%	-11.37%
Sector	Healthcare Stocks	42.54%	10.83%	46.63%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Jpmorgan chase	23.05M	12.18%	$3.32B
Darwin global management	20.46M	10.81%	$2.90B
Vanguard group	19.94M	10.53%	$2.87B
Blackrock	14.26M	9.61%	$955.72M
Blackrock funding, inc. /de	12.36M	6.53%	$1.78B
Fmr	9.18M	4.85%	$1.32B
Capital investors	7.55M	3.99%	$1.09B
Price t rowe associates inc /md/	6.93M	3.66%	$998.20M
Baker bros. advisors lp	6.70M	3.54%	$965.37M
Artisan partners limited partnership	4.94M	2.61%	$711.08M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Darwin global management	20.46M	80.54%	$2.90B
Sio capital management	1.36M	24.71%	$91.30M
Artia global partners lp	732.21K	16.69%	$105.45M
Integral health asset management	1.60M	15.59%	$230.42M
Palo alto investors lp	491.81K	13.11%	$70.82M
Patient square capital lp	326.40K	12.57%	$47.00M
Eagle health investments lp	271.60K	10.27%	$39.11M
Duquesne family office	2.42M	8.59%	$349.00M
Nwi management lp	1.02M	8.12%	$147.03M
Baker bros. advisors lp	6.70M	6.98%	$965.37M

Top Buyers

Holder	Shares	% Assets	Change
Jpmorgan chase	23.05M	0.20%	7.41M
Fmr	9.18M	0.07%	4.09M
Blackrock	14.26M	0.02%	2.46M
Vanguard group	19.94M	0.04%	2.29M
Norges bank	1.83M	0.02%	1.83M

Top Sellers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	6.93M	0.11%	-4.30M
Deep track capital, lp	-	-	-1.75M
Adage capital partners gp	1.25M	0.29%	-1.61M
Eversept partners, lp	-	-	-1.09M
Vestal point capital, lp	-	-	-1.07M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.83M	0.02%	1.83M	$126.61M
Kynam capital management, lp	1.00M	5.17%	1.00M	$67.00M
Bank of nova scotia	506.25K	0.13%	506.25K	$72.90M
Ing groep nv	373.50K	0.29%	373.50K	$53.79M
Samlyn capital	292.64K	0.58%	292.64K	$42.14M

Sold Out

Holder	Change
Nemes rush group	-3.00
Raleigh capital management	-4.00
Wealthtrak capital management	-5.00
Riverview trust	-6.00
Cva family office	-6.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	18	-96.26%	8,467,233	-95.61%	4	0.04%	10	-95.95%	4	-97.39%
Dec 31, 2024	441	-2.86%	179,579,885	-3.86%	103	0.89%	220	-15.38%	144	25.22%
Sep 30, 2024	451	3.68%	186,766,280	6.62%	107	0.77%	258	-4.80%	115	18.56%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
JPMorgan Large Cap Growth I	7.10M	3.36%	1.57M
Vanguard US Total Market Shares ETF	5.46M	3.00%	368.94K
Vanguard Total Stock Mkt Idx Inv	5.75M	2.72%	-128.70K
Capital Group Growth Fnd of Amer Comp	4.74M	2.49%	196.69K
American Funds Growth Fund of Amer A	4.74M	2.49%	196.69K
iShares Russell 2000 ETF	4.32M	2.41%	-
Vanguard Small Cap Index	4.42M	2.09%	-28.14K
US Small-Cap Growth II Equity Comp	3.62M	1.90%	-996.88K
BioPharma Credit Ord	3.17M	1.67%	838.84K
Vanguard Small Cap Growth Index Inv	2.49M	1.18%	-5.21K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Dec 05, 2025	SHAROKY MELVIN MD	-	Sell	$4.10M
Dec 04, 2025	Lewis William	Chair and CEO	Sell	$215.72K
Dec 04, 2025	Lewis William	Chair and CEO	Sell	$924.06K
Dec 04, 2025	Lewis William	Chair and CEO	Sell	$456.98K
Dec 04, 2025	Lewis William	Chair and CEO	Sell	$603.16K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	30
2025 Q3	-	43
2025 Q2	2	70
2025 Q1	-	87
2024 Q4	-	10

INSM Ownership FAQ

Who owns the most shares of Insmed?

Insmed’s largest shareholders are Jpmorgan chase (23.05M shares, 12.18%), Darwin global management (20.46M shares, 10.81%), and Vanguard group (19.94M shares, 10.53%). Together, they hold 33.51% 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?

Darwin global management is Insmed’s biggest shareholder by percentage of total assets invested, with 80.54% of its assets in 20.46M Insmed shares, valued at 2.9B$.

Who is the top mutual fund holder of Insmed shares?

JPMorgan Large Cap Growth I is the top mutual fund holder of Insmed shares, with 3.36% of its total shares outstanding invested in 7.1M Insmed shares.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis

Discover trending investment themes
Find your next best investment
Research stocks using tools