Institutional shares held 117 Million
1.25M calls
1.49M puts
Total value of holdings $52.6B
$564M calls
$669M puts
Market Cap $55.3B
123,028,000 Shares Out.
Institutional ownership 95.16%
# of Institutions 926


Latest Institutional Activity in ALNY

Top Purchases

Q4 2025
Congress Asset Management CO Shares Held: 269K ($121M)
Q4 2025
Sg Americas Securities, LLC Shares Held: 90.9K ($40.8M)
Q4 2025
Robeco Institutional Asset Management B.V. Shares Held: 145K ($65M)
Q4 2025
Sumitomo Mitsui Trust Holdings, Inc. Shares Held: 328K ($147M)
Q4 2025
Louisiana State Employees Retirement System Shares Held: 8.8K ($3.95M)

Top Sells

Q4 2025
Baillie Gifford & CO Shares Held: 2.6M ($1.17B)
Q4 2025
Assenagon Asset Management S.A. Shares Held: 25.6K ($11.5M)
Q4 2025
Allspring Global Investments Holdings, LLC Shares Held: 279K ($125M)
Q4 2025
Abrdn PLC Shares Held: 133K ($59.7M)
Q4 2025
Nisa Investment Advisors, LLC Shares Held: 9.65K ($4.33M)

About ALNY

Alnylam Pharmaceuticals, Inc., a biopharmaceutical company, focuses on discovering, developing, and commercializing novel therapeutics based on ribonucleic acid interference. The company's pipeline of investigational RNAi therapeutics focuses on genetic medicines, cardio-metabolic diseases, hepatic infectious diseases, and central nervous system (CNS)/ocular diseases. Its marketed products include ONPATTRO (patisiran), a lipid complex injection for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults; GIVLAARI for the treatment of adults with acute hepatic porphyria (AHP); and OXLUMO (lumasiran) for the treatment of primary hyperoxaluria type 1 (PH1). In addition, the company is developing givosiran for the treatment of adolescent patients with AHP; patisiran for the treatment of transthyretin amyloidosis, or ATTR amyloidosis, with cardiomyopathy; cemdisiran to treat complement-mediated diseases; ALN-AAT02 for the treatment of AAT deficiency-associated liver disease; ALN-HBV02 to treat chronic HBV infection; Zilebesiran to treat hypertension; and ALN-HSD to treat NASH. Further, it offers Fitusiran for the treatment of hemophilia and rare bleeding disorders, Inclisiran to treat hypercholesterolemia, lumasiran for the treatment of advanced PH1 and recurrent renal stones, and vutrisiran for the treatment of ATTR amyloidosis, which is in phase 3 clinical trial. Alnylam Pharmaceuticals, Inc. has strategic collaborations with Regeneron Pharmaceuticals, Inc. to discover, develop, and commercialize RNAi therapeutics for a range of diseases by addressing therapeutic targets expressed in the eye and CNS; and Sanofi Genzyme to discover, develop, and commercialize RNAi therapeutics. It also has license and collaboration agreements with Novartis AG; Vir Biotechnology, Inc.; Dicerna Pharmaceuticals, Inc.; Ionis Pharmaceuticals, Inc.; and PeptiDream, Inc. The company was founded in 2002 and is headquartered in Cambridge, Massachusetts.


Insider Transactions at ALNY

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
448K Shares
From 27 Insiders
Grant, award, or other acquisition 210K shares
Exercise of conversion of derivative security 237K shares
Sell / Disposition
365K Shares
From 11 Insiders
Open market or private sale 315K shares
Payment of exercise price or tax liability 1.12K shares
Bona fide gift 49.7K shares

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