Insmed Ownership | Who Owns Insmed?

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Insmed Ownership Summary

Insmed is owned by 54.45% institutional investors, 0.53% insiders, and 45.01% retail investors. Jpmorgan chase is the largest institutional shareholder, holding 11.30% of INSM shares. JPMorgan Large Cap Growth I is the top mutual fund, with 4.91% of its assets in Insmed shares.

INSM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Insmed	54.45%	0.53%	45.01%
Sector	Healthcare Stocks	35.38%	11.35%	53.27%
Industry	Biotech Stocks	33.91%	11.39%	54.70%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Jpmorgan chase	24.15M	11.30%	$3.70B
Vanguard group	21.08M	9.95%	$3.67B
Blackrock	14.26M	9.61%	$955.72M
Darwin global management	16.81M	7.87%	$2.58B
Blackrock funding, inc. /de	16.68M	7.81%	$2.73B
Fmr	13.16M	6.16%	$2.15B
Baker bros. advisors lp	7.42M	3.47%	$1.21B
Artisan partners limited partnership	6.53M	3.06%	$1.07B
D. e. shaw	5.63M	2.63%	$919.93M
Capital investors	5.60M	2.62%	$914.89M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Darwin global management	16.81M	68.33%	$2.58B
Sio capital management	1.36M	24.71%	$91.30M
Artia global partners lp	628.71K	22.66%	$102.81M
Integral health asset management	1.50M	11.73%	$245.28M
Palo alto investors lp	415.27K	10.39%	$67.90M
Nwi management lp	1.01M	9.43%	$165.81M
Davern capital partners, lp	182.56K	8.19%	$29.85M
Rtw investments, lp	4.84M	7.88%	$791.91M
Baker bros. advisors lp	7.42M	6.97%	$1.21B
Eagle health investments lp	224.27K	6.41%	$36.67M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	13.16M	0.11%	3.23M
Norges bank	2.91M	0.05%	2.91M
Blackrock	14.26M	0.02%	2.46M
Artisan partners limited partnership	6.53M	1.71%	1.68M
Blackrock funding, inc. /de	16.68M	0.05%	1.61M

Top Sellers

Holder	Shares	% Assets	Change
Darwin global management	16.81M	68.33%	-4.13M
Orbis allan gray	1.87M	1.29%	-2.31M
Deep track capital, lp	-	-	-1.75M
Eversept partners, lp	-	-	-1.09M
Vestal point capital, lp	-	-	-1.07M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.91M	0.05%	2.91M	$506.63M
Capital world investors	1.36M	0.03%	1.36M	$222.74M
Vanguard fiduciary trust	1.35M	0.06%	1.35M	$221.49M
Paradigm biocapital advisors lp	1.25M	4.19%	1.25M	$205.13M
Kynam capital management, lp	1.00M	5.17%	1.00M	$67.00M

Sold Out

Holder	Change
Concord wealth partners	-1.00
Tfc financial management	-1.00
Quaker wealth management	-2.00
Raleigh capital management	-4.00
Plante moran financial advisors	-5.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	18	-96.26%	8,467,233	-95.61%	4	0.04%	10	-95.95%	4	-97.39%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
JPMorgan Large Cap Growth I	10.63M	4.91%	-
JPM US Large Cap Growth-MA	10.52M	4.88%	9.69M
Vanguard Total Stock Mkt Idx Inv	6.85M	3.17%	108.24K
Vanguard US Total Market Shares ETF	5.46M	3.00%	368.94K
iShares Russell 2000 ETF	4.32M	2.41%	-
American Funds Growth Fund of Amer A	5.10M	2.36%	1.66M
Capital Group Growth Fnd of Amer Comp	5.10M	2.36%	1.66M
Invesco QQQ Trust	4.61M	2.14%	33.95K
US Small-Cap Growth II Equity Comp	3.62M	1.90%	-996.88K
BioPharma Credit Ord	3.17M	1.67%	838.84K

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 13, 2026	Bonstein Sara	Chief Financial Officer	Sell	$961.04K
May 13, 2026	Adsett Roger	Chief Operating Officer	Sell	$678.14K
May 13, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$393.15K
May 13, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$504.04K
May 14, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$1.23M

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	25
2026 Q1	-	74
2025 Q4	-	41
2025 Q3	-	43
2025 Q2	2	70

INSM Ownership FAQ

Who Owns Insmed?

Insmed shareholders are primarily institutional investors at 54.45%, followed by 0.53% insiders and 45.02% retail investors. The average institutional ownership in Insmed's industry, Biotech Stocks , is 33.91%, which Insmed exceeds.

Who owns the most shares of Insmed?

Insmed’s largest shareholders are Jpmorgan chase (24.15M shares, 11.30%), Vanguard group (21.08M shares, 9.95%), and Blackrock (14.26M shares, 9.61%). Together, they hold 30.87% 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 68.33% of its assets in 16.81M Insmed shares, valued at 2.58B$.

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 4.91% of its total shares outstanding invested in 10.63M Insmed shares.

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