Alnylam Pharmaceuticals Ownership | Who Owns Alnylam Pharmaceuticals?

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Alnylam Pharmaceuticals Ownership Summary

Alnylam Pharmaceuticals is owned by 1.37% institutional investors, 3.84% insiders, and 94.80% retail investors. Capital world investors is the largest institutional shareholder, holding 12.91% of ALNY shares. Capital Group Growth Fnd of Amer Comp is the top mutual fund, with 7.81% of its assets in Alnylam Pharmaceuticals shares.

ALNY Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Alnylam Pharmaceuticals	1.37%	3.84%	94.80%
Sector	Healthcare Stocks	279.42%	10.64%	-190.05%
Industry	Biotech Stocks	64.05%	10.69%	25.27%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Capital world investors	16.60M	12.91%	$3.91B
Fmr	13.49M	10.49%	$3.17B
Vanguard group	12.73M	9.90%	$3.00B
Blackrock funding, inc. /de	9.89M	7.69%	$2.33B
Blackrock	9.55M	7.57%	$2.32B
Capital research global investors	6.97M	5.42%	$1.64B
Regeneron pharmaceuticals	4.44M	3.46%	$1.05B
T. rowe price investment management	4.38M	3.41%	$1.03B
Wellington management group llp	4.20M	3.26%	$987.51M
Baillie gifford	4.04M	3.14%	$950.71M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Regeneron pharmaceuticals	4.44M	95.54%	$1.05B
Bridger management	41.18K	5.21%	$9.69M
Eagle health investments lp	76.26K	4.40%	$17.94M
Palo alto investors lp	83.49K	4.29%	$22.54M
Bellevue group	770.27K	3.49%	$181.25M
Sofinnova investments	176.18K	3.11%	$47.57M
Casdin capital	120.00K	2.65%	$32.40M
Rock springs capital management lp	256.20K	2.30%	$60.29M
683 capital management	122.90K	2.26%	$29.86M
Orbimed advisors	346.10K	2.23%	$93.45M

Top Buyers

Holder	Shares	% Assets	Change
Regeneron pharmaceuticals	4.44M	95.54%	4.44M
Norges bank	2.46M	0.08%	2.46M
Capital research global investors	6.97M	0.34%	1.72M
T. rowe price investment management	4.38M	0.64%	1.25M
Blackrock	9.55M	0.05%	522.66K

Top Sellers

Holder	Shares	% Assets	Change
Capital investors	-	-	-1.42M
Fmr	13.49M	0.19%	-1.19M
Baillie gifford	4.04M	0.73%	-846.74K
Wellington management group llp	4.20M	0.18%	-756.72K
Logos global management lp	-	-	-500.00K

New Positions

Holder	Shares	% Assets	Change	Value
Regeneron pharmaceuticals	4.44M	95.54%	4.44M	$1.05B
Norges bank	2.46M	0.08%	2.46M	$577.94M
Raymond james financial	277.49K	0.02%	277.49K	$65.30M
Jennison associates	259.91K	0.04%	259.91K	$61.16M
Westfield capital management co lp	216.13K	0.22%	216.13K	$50.86M

Sold Out

Holder	Change
Johnson financial group	-1.00
Activest wealth management	-1.00
Salem investment counselors	-1.00
Financial gravity asset management	-1.00
Bear mountain capital	-1.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2025	28	-95.52%	1,770,848	-98.63%	1	0.01%	11	-96.63%	10	-94.71%
Dec 31, 2024	603	-0.33%	129,230,860	5.02%	100	1.10%	315	-2.78%	183	6.40%
Sep 30, 2024	599	4.17%	123,006,457	2.58%	95	1.07%	320	10.73%	170	4.94%
Jun 30, 2024	571	3.25%	119,905,127	6.57%	95	1.19%	286	4.38%	162	3.18%
Mar 31, 2024	553	3.56%	112,509,382	-3.80%	89	1.02%	274	3.40%	157	1.95%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Capital Group Growth Fnd of Amer Comp	10.18M	7.81%	-
American Funds Growth Fund of Amer A	10.18M	7.81%	-
Vanguard Total Stock Mkt Idx Inv	4.20M	3.20%	43.59K
Vanguard US Total Market Shares ETF	4.07M	3.15%	54.28K
VA CollegeAmerica Amcap 529A	3.73M	2.89%	658.62K
Capital Group New Perspective Comp	2.93M	2.25%	-
American Funds New Perspective A	2.93M	2.25%	-
Vanguard Mid Cap Index Institutional	2.88M	2.19%	35.56K
Capital Group AMCAP Composite	2.40M	1.84%	-
American Funds AMCAP A	2.40M	1.84%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 02, 2025	Greenstreet Yvonne	Chief Executive Officer	Sell	$5.90M
May 30, 2025	Greenstreet Yvonne	Chief Executive Officer	Sell	$7.74M
May 15, 2025	BONNEY MICHAEL W	-	Sell	$195.78K
May 15, 2025	BONNEY MICHAEL W	-	Sell	$146.66K
May 15, 2025	BONNEY MICHAEL W	-	Sell	$66.10K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	-
2025 Q2	-	17
2025 Q1	-	152
2024 Q4	-	36
2024 Q3	-	16

ALNY Ownership FAQ

Who Owns Alnylam Pharmaceuticals?

Alnylam Pharmaceuticals shareholders are primarily institutional investors at 1.37%, followed by 3.84% insiders and 94.79% retail investors. The average institutional ownership in Alnylam Pharmaceuticals's industry, Biotech Stocks , is 64.05%, which Alnylam Pharmaceuticals falls below.

Who owns the most shares of Alnylam Pharmaceuticals?

Alnylam Pharmaceuticals’s largest shareholders are Capital world investors (16.6M shares, 12.91%), Fmr (13.49M shares, 10.49%), and Vanguard group (12.73M shares, 9.90%). Together, they hold 33.30% 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?

Regeneron pharmaceuticals is Alnylam Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 95.54% of its assets in 4.44M Alnylam Pharmaceuticals shares, valued at 1.05B$.

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

Capital Group Growth Fnd of Amer Comp is the top mutual fund holder of Alnylam Pharmaceuticals shares, with 7.81% of its total shares outstanding invested in 10.18M Alnylam Pharmaceuticals shares.

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