Insmed Ownership | Who Owns Insmed?

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Insmed Ownership Summary

Insmed is owned by 63.52% institutional investors, 0.54% insiders, and 35.94% retail investors. Jpmorgan chase is the largest institutional shareholder, holding 10.96% 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	63.52%	0.54%	35.94%
Sector	Healthcare Stocks	232.52%	10.72%	-143.24%
Industry	Biotech Stocks	384.56%	10.59%	-295.14%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Jpmorgan chase	23.20M	10.96%	$4.04B
Darwin global management	20.46M	10.81%	$2.90B
Vanguard group	21.08M	9.95%	$3.67B
Blackrock	14.26M	9.61%	$955.72M
Blackrock funding, inc. /de	15.07M	7.11%	$2.62B
Fmr	9.18M	4.85%	$1.32B
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
Capital investors	5.15M	2.43%	$896.60M

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	267.00K	9.95%	$46.47M
Duquesne family office	2.42M	8.59%	$349.00M
Nwi management lp	1.02M	8.12%	$147.03M
Eagle health investments lp	210.90K	8.07%	$36.71M
Baker bros. advisors lp	6.70M	6.98%	$965.37M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	9.18M	0.07%	4.09M
Norges bank	2.91M	0.05%	2.91M
Blackrock funding, inc. /de	15.07M	0.04%	2.70M
Blackrock	14.26M	0.02%	2.46M
Orbis allan gray	3.25M	2.01%	1.73M

Top Sellers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	6.93M	0.11%	-4.30M
Capital investors	5.15M	0.14%	-2.40M
Deep track capital, lp	-	-	-1.75M
Adage capital partners gp	1.25M	0.29%	-1.61M
Eversept partners, lp	-	-	-1.09M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.91M	0.05%	2.91M	$506.63M
Kynam capital management, lp	1.00M	5.17%	1.00M	$67.00M
Bank of nova scotia	506.25K	0.13%	506.25K	$72.90M
Sumitomo mitsui trust	435.44K	0.04%	435.44K	$75.78M
Gateway investment advisers	365.00K	0.59%	365.00K	$63.52M

Sold Out

Holder	Change
Raleigh capital management	-4.00
Wealthtrak capital management	-5.00
Plante moran financial advisors	-5.00
Riverview trust	-6.00
Persistent asset partners	-8.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2024	441	-2.86%	179,579,885	-3.86%	103	0.89%	220	-15.38%	144	25.22%

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
Feb 09, 2026	Lewis William	Chair and CEO	Sell	$191.54K
Feb 09, 2026	Lewis William	Chair and CEO	Sell	$719.37K
Feb 09, 2026	Lewis William	Chair and CEO	Sell	$1.07M
Feb 05, 2026	Flammer Martina M.D.	Chief Medical Officer	Sell	$132.47K
Feb 03, 2026	Adsett Roger	Chief Operating Officer	Sell	$123.53K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	58
2025 Q4	-	41
2025 Q3	-	43
2025 Q2	2	70
2025 Q1	-	87

INSM Ownership FAQ

Who Owns Insmed?

Insmed shareholders are primarily institutional investors at 63.52%, followed by 0.54% insiders and 35.94% retail investors. The average institutional ownership in Insmed's industry, Biotech Stocks , is 384.56%, which Insmed falls below.

Who owns the most shares of Insmed?

Insmed’s largest shareholders are Jpmorgan chase (23.2M shares, 10.96%), Darwin global management (20.46M shares, 10.81%), and Vanguard group (21.08M shares, 9.95%). Together, they hold 31.72% 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.

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