Alnylam Pharmaceuticals Ownership | Who Owns Alnylam Pharmaceuticals?

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Alnylam Pharmaceuticals Ownership Summary

Alnylam Pharmaceuticals is owned by 100.73% institutional investors, 0.18% insiders. Fmr is the largest institutional shareholder, holding 11.31% of ALNY shares. American Funds Growth Fund of Amer A is the top mutual fund, with 6.01% of its assets in Alnylam Pharmaceuticals shares.

ALNY Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Alnylam Pharmaceuticals	100.73%	0.18%	-0.92%
Sector	Healthcare Stocks	50.62%	12.41%	36.97%
Industry	Biotech Stocks	49.15%	12.15%	38.70%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	15.02M	11.31%	$4.52B
Vanguard group	13.55M	10.31%	$5.39B
Capital world investors	11.14M	8.39%	$3.35B
Blackrock funding, inc. /de	10.91M	8.21%	$3.28B
Blackrock	9.55M	7.57%	$2.32B
Capital research global investors	9.75M	7.34%	$2.94B
Vanguard capital management	6.03M	4.54%	$1.82B
T. rowe price investment management	5.64M	4.25%	$1.70B
Invesco	3.75M	2.83%	$1.13B
State street	3.56M	2.68%	$1.07B

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Davern capital partners, lp	113.08K	5.80%	$34.04M
Prosight management, lp	98.08K	5.09%	$29.53M
Deep track capital, lp	825.00K	3.61%	$248.35M
Palo alto investors lp	32.32K	2.73%	$14.74M
Paradigm biocapital advisors lp	480.00K	2.71%	$144.49M
Rosenblum silverman sutton s f inc /ca	32.17K	2.33%	$9.68M
Quantessence capital	15.87K	2.29%	$7.24M
Cannon global investment management	2.50K	2.13%	$752.58K
Orbis allan gray	1.99M	2.06%	$598.27M
Susquehanna advisors group	286.10K	2.00%	$130.46M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	2.27M	0.07%	2.27M
Invesco	3.75M	0.09%	970.92K
Deep track capital, lp	825.00K	3.61%	825.00K
Sixth street partners management company	755.38K	0.03%	755.38K
Orbis allan gray	1.99M	2.06%	652.58K

Top Sellers

Holder	Shares	% Assets	Change
Jpmorgan chase	2.68M	0.04%	-3.65M
Regeneron pharmaceuticals	-	-	-1.39M
Marshall wace, llp	259.80K	0.06%	-839.52K
Holocene advisors, lp	13.09K	0.01%	-583.73K
Logos global management lp	-	-	-500.00K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	2.27M	0.07%	2.27M	$683.88M
Deep track capital, lp	825.00K	3.61%	825.00K	$248.35M
Sixth street partners management company	755.38K	0.03%	755.38K	$227.39M
Paradigm biocapital advisors lp	480.00K	2.71%	480.00K	$144.49M
Susquehanna advisors group	286.10K	2.00%	286.10K	$130.46M

Sold Out

Holder	Change
Rise advisors	-1.00
Salem investment counselors	-1.00
Bear mountain capital	-1.00
Financial gravity asset management	-1.00
Kohmann bosshard financial services	-1.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	813	-0.97%	133,866,844	2.89%	100	1.04%	407	-3.55%	279	5.68%
Mar 31, 2026	458	-48.42%	28,867,328	-77.75%	21	0.22%	228	-49.78%	136	-53.42%
Dec 31, 2025	684	-20.56%	91,965,556	-31.27%	69	0.66%	343	-32.61%	232	5.45%
Sep 30, 2025	822	19.83%	128,435,377	-3.80%	99	0.93%	481	36.26%	215	-3.15%
Jun 30, 2025	685	2.09%	133,478,551	3.70%	102	1.04%	354	1.14%	220	10.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
American Funds Growth Fund of Amer A	8.02M	6.01%	-1.79M
American Funds Growth Fd of Amer A	7.62M	5.71%	-403.94K
Capital Group Growth Fnd of Amer Comp	7.62M	5.71%	-403.94K
Vanguard MStar Total Stk Mkt Idx Invest	4.25M	3.18%	12.39K
Vanguard Total Stock Mkt Idx Inv	4.24M	3.18%	18.06K
Vanguard Morn Total Stk Mkt Idx Investor	4.24M	3.18%	18.06K
Vanguard US Total Market Shares ETF	4.07M	3.15%	54.28K
Capital Group AMCAP Composite	4.10M	3.07%	357.02K
American Funds AMCAP A	4.10M	3.07%	357.02K
VA CollegeAmerica Amcap 529A	3.73M	2.89%	658.62K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 01, 2026	PYOTT DAVID E I	-	Sell	$366.44K
Jun 01, 2026	PYOTT DAVID E I	-	Sell	$148.86K
Jun 01, 2026	PYOTT DAVID E I	-	Sell	$274.19K
Jun 01, 2026	PYOTT DAVID E I	-	Sell	$351.22K
Jun 01, 2026	PYOTT DAVID E I	-	Sell	$5.15K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	14
2026 Q1	-	228
2025 Q4	-	96
2025 Q3	-	80
2025 Q2	-	17

ALNY Ownership FAQ

Who Owns Alnylam Pharmaceuticals?

Alnylam Pharmaceuticals shareholders are primarily institutional investors at 100.73%, followed by 0.18% insiders and -0.91% retail investors. The average institutional ownership in Alnylam Pharmaceuticals's industry, Biotech Stocks , is 49.15%, which Alnylam Pharmaceuticals exceeds.

Who owns the most shares of Alnylam Pharmaceuticals?

Alnylam Pharmaceuticals’s largest shareholders are Fmr (15.02M shares, 11.31%), Vanguard group (13.55M shares, 10.31%), and Capital world investors (11.14M shares, 8.39%). Together, they hold 30.00% of Alnylam Pharmaceuticals’s total shares outstanding.

Does Blackrock own Alnylam Pharmaceuticals?

Yes, BlackRock owns 7.57% of Alnylam Pharmaceuticals, totaling 9.55M shares as of Jun 2024. This represents 0.05% of BlackRock's total assets, with a market value of 2.32B$. In the last quarter, BlackRock increased its holdings by 522.66K shares, a 5.79% change.

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

Davern capital partners, lp is Alnylam Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 5.80% of its assets in 113.08K Alnylam Pharmaceuticals shares, valued at 34.04M$.

Who is the top mutual fund holder of Alnylam Pharmaceuticals shares?

American Funds Growth Fund of Amer A is the top mutual fund holder of Alnylam Pharmaceuticals shares, with 6.01% of its total shares outstanding invested in 8.02M Alnylam Pharmaceuticals shares.

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