Alnylam Pharmaceuticals ALNY Institutional Ownership

NASDAQ ALNY

$255.36 -0.60 (-0.23%)

At close: Sep 28, 2026 · 4:00 PM EDT

Institutions by Trading Activity

788 Institutions

Increased 413 52.4%

Unchanged 98 12.4%

Reduced 277 35.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

100.42%

▲+3.72 pp QoQ

Shares Held by Institutions

134.17Mn

of 133.61Mn outstanding

▲+4.84% QoQ

Shares Outstanding

133.61Mn

-563.79K held outside 13F filers

Institutional Investors

788

filed 13F for Jun 2026

▲+4 vs prior quarter

Net Shares Added (QoQ)

+6.19Mn

accumulated since last quarter

Value of Holdings

$34.34Bn

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

Quarter ending 30 Jun, 2026

Alnylam Pharmaceuticals, Inc. (NASDAQ:ALNY) has 788 institutional investors that have filed 13F reports for the period ending June 2026.

Their combined ownership stood at 100.4% of outstanding shares in June 2026, up from 96.7% in March 2026.
They increased total shares held in Alnylam Pharmaceuticals by 4.84% from last quarter, and the number of investors in ALNY increased 21.04% annually.
Of these 788 funds, 413 grew their exposure to Alnylam Pharmaceuticals, 277 cut back, and 98 maintained positions.
Institutional investors collectively held 134.17Mn shares in Alnylam Pharmaceuticals as of June 2026, up by 6.19Mn shares quarter on quarter, and up 1.92Mn shares year over year.
As of June 30, 2026, the biggest holder of Alnylam Pharmaceuticals is FMR LLC at 15.02Mn shares, representing 11.24% of shares outstanding.
The most significant purchases of ALNY for the quarter ending June 2026 came from Invesco Ltd. (2.46Mn), NORGES BANK (2.27Mn), Deep Track Capital, LP (825.0K), Sixth Street Partners Management Company, L.P. (755.38K), Orbis Allan Gray Ltd (652.58K).
Top sellers of ALNY stock for the quarter ending June 2026 included Jpmorgan Chase & Co (3.65Mn), MARSHALL WACE, LLP (839.52K), PRICE T ROWE ASSOCIATES INC /MD/ (283.55K), Allspring Global Investments Holdings, LLC (279.25K), Bellevue Group AG (233.45K).
Alnylam Pharmaceuticals's 10 largest shareholders as of June 2026 include FMR LLC (15.02Mn), Capital World Investors (11.14Mn), BlackRock, Inc. (10.91Mn), Capital Research Global Investors (9.75Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (6.54Mn), VANGUARD CAPITAL MANAGEMENT LLC (6.03Mn), T. Rowe Price Investment Management, Inc. (5.64Mn), Invesco Ltd. (3.75Mn), State Street Corp (3.56Mn), Jpmorgan Chase & Co (2.68Mn) per Business Quant data.

Form 13F Holdings

787 Institutional Holders

Report period 30 Jun, 2026

Total shares held 134.17Mn

Of outstanding 100.42%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	FMR LLC	0000315066	15,023,962	11.24%	▲444,796	+3.05%	$4.52Bn
2	Capital World Investors	0001422849	11,144,846	8.34%	▲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	7.30%	▲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	1.83%	▼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