CL
ALNY icon

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
-400
Closed -$182K – 1015
2025
Q3 		$182K Buy
+400
New +$163K 0.01% 786
2022
Q4 		– Sell
-23,600
Closed -$4.72M – 940
2022
Q3 		$4.72M Buy
+23,600
New +$4.5M 0.22% 102

Other funds holding ALNY

Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $97.9B AUM 20.73% 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. 849 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.
  • 849 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.