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CSS LLC’s Alnylam Pharmaceuticals ALNY Stock Holding History

CSS LLC’s Portfolio ALNY Stock Details ALNY Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-2,010
Closed -$917K – 1014
2025
Q3 		$917K Buy
+2,010
New +$818K 0.04% 352
2024
Q4 		– Sell
-7,500
Closed -$2.06M – 964
2024
Q3 		$2.06M Buy
7,500
+6,800
+971% +$1.77M 0.09% 159
2024
Q2 		$170K Buy
+700
New +$111K 0.01% 704
2022
Q4 		– Sell
-4,613
Closed -$924K – 939
2022
Q3 		$924K Buy
+4,613
New +$880K 0.04% 363

Other funds holding ALNY

Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return

CSS LLC's ALNY Position: Q4 2025 in Review

CSS LLC sold out of Alnylam Pharmaceuticals (ALNY) in Q4 2025, closing a stake of 2,010 shares — an estimated $917K sold.

CSS LLC first reported a position in ALNY in Q3 2022 and held it in 4 quarters. The position peaked at $2.06M in Q3 2024. 851 funds tracked by Wall St. Rank hold ALNY as of Q4 2025.

  • CSS LLC reported no remaining Alnylam Pharmaceuticals position as of Q4 2025 after selling out during the quarter.
  • CSS LLC sold 2,010 Alnylam Pharmaceuticals shares in Q4 2025, an estimated $917K.
  • CSS LLC first reported a position in Alnylam Pharmaceuticals in Q3 2022 and held it in 4 quarters.
  • CSS LLC's Alnylam Pharmaceuticals position peaked at $2.06M in Q3 2024.
  • 851 funds tracked by Wall St. Rank held Alnylam Pharmaceuticals as of Q4 2025.

Based on CSS LLC's 13F filing for Q4 2025, filed 17 Feb 2026.