Insmed Ownership | Who Owns Insmed?

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Insmed Ownership Summary

Insmed is owned by 111.09% institutional investors, 0.67% insiders. Vanguard group is the largest institutional shareholder, holding 10.49% of INSM shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 3.00% of its assets in Insmed shares.

INSM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Insmed	111.09%	0.67%	-11.75%
Sector	Healthcare Stocks	488.17%	11.08%	-399.26%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	18.22M	10.49%	$1.26B
Blackrock	14.26M	9.61%	$955.72M
Darwin global management	15.40M	8.51%	$1.20B
Price t rowe associates inc /md/	12.70M	7.31%	$877.11M
Blackrock funding, inc. /de	11.14M	5.89%	$1.12B
Baker bros. advisors lp	7.71M	4.07%	$776.23M
Capital investors	7.48M	3.95%	$752.67M
State street	4.66M	3.14%	$312.38M
Fmr	4.86M	2.80%	$335.28M
Geode capital management	4.09M	2.35%	$282.24M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Darwin global management	15.40M	82.08%	$1.20B
Sio capital management	1.36M	24.71%	$91.30M
Palo alto investors lp	865.11K	18.52%	$87.06M
Lion point capital, lp	30.50K	14.84%	$2.33M
Integral health asset management	1.60M	14.74%	$161.02M
Patient square capital lp	358.80K	13.02%	$36.11M
Eagle health investments lp	513.70K	8.69%	$35.47M
Baker bros. advisors lp	7.71M	7.53%	$776.23M
Affinity asset advisors	475.00K	6.53%	$47.80M
Cutter capital management, lp	186.38K	6.19%	$14.22M

Top Buyers

Holder	Shares	% Assets	Change
Blackrock	14.26M	0.02%	2.46M
Darwin global management	15.40M	82.08%	2.44M
Baker bros. advisors lp	7.71M	7.53%	2.33M
Norges bank	1.83M	0.02%	1.83M
Orbis allan gray	1.52M	0.75%	1.52M

Top Sellers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	11.14M	0.02%	-4.91M
Fmr	4.86M	0.02%	-2.34M
T. rowe price investment management	-	-	-1.48M
Suvretta capital management	238.78K	0.72%	-1.25M
State street	4.66M	0.01%	-1.24M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.83M	0.02%	1.83M	$126.61M
Orbis allan gray	1.52M	0.75%	1.52M	$153.39M
Kynam capital management, lp	1.00M	5.17%	1.00M	$67.00M
Hrt financial lp	729.60K	0.32%	729.60K	$73.43M
Alkeon capital management	500.00K	0.08%	500.00K	$50.32M

Sold Out

Holder	Change
Bogart wealth	-6.00
Riverview trust	-6.00
Cva family office	-6.00
Corecap advisors	-9.00
Golden state wealth management	-10.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Jun 30, 2024	435	32.62%	175,177,026	18.19%	117	1.18%	271	83.11%	97	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	5.46M	3.00%	368.94K
JPMorgan Large Cap Growth I	5.53M	2.91%	5.53M
Vanguard Total Stock Mkt Idx Inv	5.75M	2.72%	-128.70K
American Funds Growth Fund of Amer A	4.74M	2.49%	196.69K
Capital Group Growth Fnd of Amer Comp	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
T. Rowe Price New Horizons	3.62M	1.90%	-526.30K
BioPharma Credit Ord	3.17M	1.67%	838.84K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 02, 2025	Smith Michael Alexander	Chief Legal Officer	Sell	$1.20M
Sep 02, 2025	Smith Michael Alexander	Chief Legal Officer	Sell	$191.13K
Sep 02, 2025	Smith Michael Alexander	Chief Legal Officer	Sell	$1.06M
Sep 02, 2025	Smith Michael Alexander	Chief Legal Officer	Sell	$156.27K
Sep 02, 2025	Smith Michael Alexander	Chief Legal Officer	Sell	$717.77K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	38
2025 Q2	2	70
2025 Q1	-	87
2024 Q4	-	10
2024 Q3	-	12

INSM Ownership FAQ

Who owns the most shares of Insmed?

Insmed’s largest shareholders are Vanguard group (18.22M shares, 10.49%), Blackrock (14.26M shares, 9.61%), and Darwin global management (15.4M shares, 8.51%). Together, they hold 28.61% 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 82.08% of its assets in 15.4M Insmed shares, valued at 1.2B$.

Who is the top mutual fund holder of Insmed shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Insmed shares, with 3.00% of its total shares outstanding invested in 5.46M Insmed shares.

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