Alnylam Pharmaceuticals, Inc.
DE ˙ XTRA ˙ US02043Q1076
260,50 € ↑8,70 (3,46%)
2026-06-04
DEL PRIS
SecurityDE:DUL / Alnylam Pharmaceuticals, Inc.
InstitutionNational Pension Service
Latest Disclosed Ownership183,789 shares
Latest Disclosed Value $ 60,810,266
National Pension Service reports 9.30% increase in ownership of DUL / Alnylam Pharmaceuticals, Inc.

On May 12, 2026 - National Pension Service filed a 13F-HR form disclosing ownership of 183,789 shares of Alnylam Pharmaceuticals, Inc. (DE:DUL) valued at $52,508,517 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 168,149 shares of Alnylam Pharmaceuticals, Inc.. This represents a change in shares of 9.30% during the quarter. The current value of the position is $47,877,034 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)
2026-05-12 2026-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 183,789 15,640 9.30 60,810 -9.05 0.0462
2026-02-10 2025-12-31 13F ALNYLAM PHARMACEUTICALS ALNYLAM PHARMACEUTICALS INC 02043Q107 168,149 -9,089 -5.13 66,864 -17.27 0.0495
2025-11-04 2025-09-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 177,238 2,192 1.25 80,821 41.59 0.0628
2025-08-08 2025-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 175,046 1,387 0.80 57,081 21.73 0.0493
2025-05-13 2025-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 173,659 14,148 8.87 46,891 24.93 0.0451
2025-02-05 2024-12-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 159,511 -36,876 -18.78 37,535 -30.51 0.0355
2024-10-30 2024-09-30 13F ALNYLAMPHARMACEUTICALSINC COM 02043Q107 196,387 0 0.00 54,012 13.18 0.0521
2024-08-13 2024-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 196,387 10,204 5.48 47,722 71.51 0.0548
2024-05-14 2024-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 186,183 18,413 10.98 27,825 -13.35 0.0334
2024-02-07 2023-12-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 167,770 0 0.00 32,113 9.34 0.0447
2023-11-15 2023-09-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 167,770 -4,215 -2.45 29,368 -10.62 0.0470
2023-08-16 2023-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 171,985 15,755 10.08 32,859 7.79 0.0530
2023-05-12 2023-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 156,230 0 0.00 30,484 -17.90 0.0555
2023-02-24 2022-12-31 13F/A-1 ALNYLAM PHARMACEUTICALS COM 02043Q107 156,230 -757 -0.48 37,128 12.95 0.0730
2023-02-21 2022-12-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 156,230 -757 37 0.0730
2023-02-24 2022-09-30 13F/A-1 ALNYLAM PHARMACEUTICALS COM 02043Q107 156,987 -23,911 -13.22 32,872 24.59 0.0686
2022-11-18 2022-09-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 156,987 -23,911 32,872 0.0686
2022-08-17 2022-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 180,898 0 0.00 26,384 -10.68 0.0544
2022-05-13 2022-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 180,898 5,105 2.90 29,539 -0.91 0.0539
2022-02-15 2021-12-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 175,793 -5,310 -2.93 29,811 -12.82 0.0520
2021-11-18 2021-09-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 181,103 -1,758 -0.96 34,194 10.31 0.0651
2021-08-17 2021-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 182,861 0 0.00 30,999 20.07 0.0589
2021-05-14 2021-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 182,861 -7,052 -3.71 25,818 4.60 0.0540
2021-02-19 2020-12-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 189,913 16,787 9.70 24,683 1.97 0.0563
2020-11-13 2020-09-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 173,126 0 0.00 24,205 -5.60 0.0636
2020-08-11 2020-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 173,126 173,126 25,642 0.0732
2018-08-14 2018-06-30 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 0 -100,913 -100.00 0 -100.00
2018-04-13 2018-03-31 13F ALNYLAM PHARMACEUTICALS COM 02043Q107 100,913 100,913 12,019 0.0596
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.