Alnylam Pharmaceuticals, Inc.
DE ˙ XTRA ˙ US02043Q1076
251,80 € ↑6,70 (2,73%)
2026-06-03
DEL PRIS
SecurityDE:DUL / Alnylam Pharmaceuticals, Inc.
InstitutionAdvisory Services Network, LLC
Latest Disclosed Ownership6,314 shares
Latest Disclosed Value $ 2,089,100
Advisory Services Network, LLC reports 21.98% decrease in ownership of DUL / Alnylam Pharmaceuticals, Inc.

On May 15, 2026 - Advisory Services Network, LLC filed a 13F-HR form disclosing ownership of 6,314 shares of Alnylam Pharmaceuticals, Inc. (DE:DUL) valued at $1,803,910 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 8,093 shares of Alnylam Pharmaceuticals, Inc.. This represents a change in shares of -21.98% during the quarter. The current value of the position is $1,589,865 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ALNYLAM PHARMACEUTICALS INC COM Stock 02043Q107 6,314 -1,779 -21.98 2,089 -35.08 0.0193
2026-02-17 2025-12-31 13F ALNYLAM PHARMACEUTICALS INC COM Stock 02043Q107 8,093 1,087 15.52 3,218 0.75 0.0455
2025-11-18 2025-09-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 7,006 591 9.21 3,195 26.95 0.0469
2025-08-19 2025-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 6,415 -7,101 -52.54 2,516 -31.05 0.0405
2025-05-15 2025-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 13,516 7,248 115.63 3,649 147.56 0.0701
2025-02-13 2024-12-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 6,268 -301 -4.58 1,475 -7.64 0.0275
2024-11-14 2024-09-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 6,569 0 0.00 1,596 0.00 0.0330
2024-08-13 2024-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 6,569 6,569 1,596 0.0330
2024-05-06 2024-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -299 -100.00 0 -100.00
2024-02-09 2023-12-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 299 299 57 0.0014
2023-08-09 2023-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -273 -100.00 0 -100.00
2023-05-17 2023-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 273 -554 -66.99 55 -72.45 0.0015
2023-02-13 2022-12-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 827 827 197 0.0060
2021-11-05 2021-09-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -50 -100.00 0 -100.00
2021-08-12 2021-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 50 50 8 0.0003
2021-05-24 2021-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -50 -100.00 0 -100.00
2021-02-09 2020-12-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 50 -147 -74.62 6 -79.31 0.0002
2020-11-16 2020-09-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 197 197 294.00 29 383.33 0.0014
2020-08-10 2020-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -44 -100.00 0 -100.00
2020-05-15 2020-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 44 44 5 0.0003
2016-10-07 2016-09-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 0 -10 -100.00 0 -100.00
2016-07-27 2016-06-30 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 10 0 0.00 1 0.00 0.0002
2016-04-21 2016-03-31 13F ALNYLAM PHARMACEUTICALS Stock 02043Q107 10 0 0.00 1 0.00 0.0003
2016-01-27 2015-12-31 13F ALNYLAM PHARMACEUTICALS INC COM Stock 02043Q107 10 0 0.00 1 0.00 0.0003
2015-10-01 2015-09-30 13F ALNYLAM PHARMACEUTICALS INC COM Stock 02043Q107 10 10 1 0.0003
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.