Alnylam Pharmaceuticals ALNY Institutional Ownership

NASDAQ ALNY

$227.28 +2.18 (+0.97%)

At close: Oct 22, 2026 · 4:00 PM EDT

Institutions by Trading Activity

786 Institutions

Increased 412 52.4%

Unchanged 97 12.3%

Reduced 277 35.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

99.73%

▲+3.43 pp QoQ

Shares Held by Institutions

133.38Mn

of 133.73Mn outstanding

▲+3.79% QoQ

Shares Outstanding

133.73Mn

355.16K held outside 13F filers

Institutional Investors

786

filed 13F for Jun 2026

▲+1 vs prior quarter

Net Shares Added (QoQ)

+4.87Mn

accumulated since last quarter

Value of Holdings

$30.02Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 21, 2026

Alnylam Pharmaceuticals, Inc. (NASDAQ:ALNY) was held by 786 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

Collectively, these holders controlled 99.73% of Alnylam Pharmaceuticals' outstanding shares in Q2 2026, up from 96.31% in Q1 2026.
Total shares held in Alnylam Pharmaceuticals rose 3.79% versus Q1 2026, while the number of holders rose 20.92% versus Q2 2025.
Of these 786 holders, 412 added to their positions, 277 reduced their stakes and 97 left their positions unchanged.
Altogether, institutional holders owned 133.38Mn ALNY shares at the end of Q2 2026, up 4.87Mn from the prior quarter and up 2.67Mn from a year earlier.
As of June 30, 2026, FMR LLC held the largest stake in Alnylam Pharmaceuticals with 15.02Mn shares, or 11.23% of shares outstanding.
The biggest increases in ALNY positions during Q2 2026 came from Invesco Ltd. (+2.46Mn shares), Orbis Allan Gray Ltd (+652.58K shares), Los Angeles Capital Management LLC (+641.36K shares), BlackRock, Inc. (+462.77K shares) and T. Rowe Price Investment Management, Inc. (+448.85K shares).
On the other side, among holders that kept a position in Alnylam Pharmaceuticals, the largest reductions in Q2 2026 came from JPMorgan Chase & Co (-3.65Mn shares), Marshall Wace, LLP (-839.52K shares), T. Rowe Price Associates Inc (-283.55K shares), Allspring Global Investments Holdings, LLC (-279.25K shares) and Bellevue Group AG (-233.45K shares).
Per Business Quant, the top 10 investors in ALNY for the quarter ended June 30, 2026 were FMR LLC (15.02Mn shares), Capital World Investors (11.14Mn shares), BlackRock, Inc. (10.91Mn shares), Capital Research Global Investors (9.75Mn shares), Vanguard Portfolio Management LLC (6.54Mn shares), Vanguard Capital Management LLC (6.03Mn shares), T. Rowe Price Investment Management, Inc. (5.64Mn shares), Invesco Ltd. (3.75Mn shares), State Street Corp (3.56Mn shares) and JPMorgan Chase & Co (2.68Mn shares).

Form 13F Holdings

787 Institutional Holders

Report period 30 Jun, 2026

Total shares held 133.38Mn

Of outstanding 99.73%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	FMR LLC	0000315066	15,023,962	11.23%	▲444,796	+3.05%	$4.52Bn
2	Capital World Investors	0001422849	11,144,846	8.33%	▲342,498	+3.17%	$3.35Bn
3	BlackRock, Inc.	0002012383	10,907,675	8.16%	▲462,767	+4.43%	$3.28Bn
4	Capital Research Global Investors	0001422848	9,750,699	7.29%	▲279,518	+2.95%	$2.94Bn
5	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	6,538,390	4.89%	▲47,110	+0.73%	$1.97Bn
6	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	6,029,478	4.51%	▲82,772	+1.39%	$1.82Bn
7	T. Rowe Price Investment Management, Inc.	0001897612	5,642,173	4.22%	▲448,849	+8.64%	$1.70Mn
8	Invesco Ltd.	0000914208	3,754,318	2.81%	▲2,462,592	+190.64%	$1.13Bn
9	State Street Corp	0000093751	3,555,689	2.66%	▲232,991	+7.01%	$1.07Bn
10	Jpmorgan Chase & Co	0000019617	2,675,517	2.00%	▼3,648,235	-57.69%	$785.32Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	2,635,840	1.97%	▼24,545	-0.92%	$791.35Mn
12	BAILLIE GIFFORD & CO	0001088875	2,439,889	1.82%	▼53,977	-2.16%	$734.48Mn
13	NORGES BANK	0001374170	2,271,813	1.70%	▲2,271,813	0.00%	$683.88Mn
14	WELLINGTON MANAGEMENT GROUP LLP	0000902219	2,110,407	1.58%	▲174,482	+9.01%	$635.30Mn
15	Orbis Allan Gray Ltd	0001663865	1,987,407	1.49%	▲652,582	+48.89%	$598.27Mn
16	DODGE & COX	0000200217	1,955,393	1.46%	▲26,140	+1.35%	$588.63Mn
17	TWO SIGMA INVESTMENTS, LP	0001179392	1,875,937	1.40%	▼116,640	-5.85%	$564.71Mn
18	AMERICAN CENTURY COMPANIES INC	0000748054	1,853,956	1.39%	▲51,593	+2.86%	$558.10Mn
19	Clearbridge Investments, LLC	0001348883	1,259,483	0.94%	▼96,553	-7.12%	$379.14Mn
20	PRICE T ROWE ASSOCIATES INC /MD/	0000080255	1,149,201	0.86%	▼283,547	-19.79%	$345.95K

Showing 1 to 20 of 787 holders