Fred Alger Management, Llc ownership in DUL / Alnylam Pharmaceuticals, Inc.

Alnylam Pharmaceuticals, Inc.

DE ˙ XTRA ˙ US02043Q1076

251,80 € ↑6,70 (2,73%)

2026-06-03
DEL PRIS

Security	DE:DUL / Alnylam Pharmaceuticals, Inc.
Institution	Fred Alger Management, Llc
Latest Disclosed Ownership	12,597 shares
Latest Disclosed Value	$ 4,167,969

On May 15, 2026 - Fred Alger Management, Llc filed a 13F-HR form disclosing ownership of 12,597 shares of Alnylam Pharmaceuticals, Inc. (DE:DUL) valued at $3,598,963 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Alnylam Pharmaceuticals, Inc.. The current value of the position is $3,171,925 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-15	2026-03-31	13F	Alnylam Pharmaceuticals	Equity	02043Q107	12,597	12,597		4,168		0.0116
2026-02-17	2025-12-31	13F	Alnylam Pharmaceuticals	Equity	02043Q107	0	-1,986	-100.00	0	-100.00
2025-11-14	2025-09-30	13F	Alnylam Pharmaceuticals	Equity	02043Q107	1,986	1,986		906		0.0035
2020-11-13	2020-09-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	0	-18,558	-100.00	0	-100.00
2020-08-14	2020-06-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	18,558	1,587	9.35	2,749	48.84	0.0091
2020-05-19	2020-03-31	13F/A-1	ALNYLAM PHARMACEUTICALS	Common	02043Q107	16,971	-6,026	-26.20	1,847	-30.28	0.0081
2020-05-15	2020-03-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	16,971	-6,026		1,847		8,126.3479
2020-02-14	2019-12-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	22,997	-568,973	-96.12	2,649	-94.44	0.0097
2019-11-14	2019-09-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	591,970	-196,849	-24.95	47,606	-16.83	0.1868
2019-08-14	2019-06-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	788,819	371,106	88.84	57,237	46.63	0.2198
2019-05-14	2019-03-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	417,713	328,635	368.93	39,035	501.00	0.1555
2019-02-14	2018-12-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	89,078	-40,004	-30.99	6,495	-42.51	0.0299
2018-11-14	2018-09-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	129,082	103,829	411.16	11,297	354.24	0.0424
2018-07-19	2018-06-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	25,253	25,253		2,487		0.0104
2014-08-14	2014-06-30	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	0	-122,969	-100.00	0	-100.00
2014-05-15	2014-03-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	122,969	42,556	52.92	8,256	59.66	0.0409
2014-02-14	2013-12-31	13F	ALNYLAM PHARMACEUTICALS	Common	02043Q107	80,413	80,413		5,171		0.0264

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.