Winslow Capital Management
ALNY icon

Winslow Capital Management’s Alnylam Pharmaceuticals ALNY Stock Holding History

Winslow Capital Management’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
2026
Q1 		– Sell
-1,266
Closed -$503K – 61
2025
Q4 		$503K Sell
1,266
-69
-5% -$30.5K ﹤0.01% 57
2025
Q3 		$609K Sell
1,335
-1,176,104
-100% -$479M ﹤0.01% 55
2025
Q2 		$384M Sell
1,177,439
-9,739
-0.8% -$2.69M 1.28% 26
2025
Q1 		$321M Buy
1,187,178
+166,611
+16% +$42.8M 1.28% 29
2024
Q4 		$240M Buy
1,020,567
+58,960
+6% +$15.5M 0.85% 41
2024
Q3 		$264M Buy
+961,607
New +$250M 0.95% 40

Other funds holding ALNY

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 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
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Winslow Capital Management's ALNY Position: Q1 2026 in Review

Winslow Capital Management sold out of Alnylam Pharmaceuticals (ALNY) in Q1 2026, closing a stake of 1,266 shares — an estimated $503K sold.

Winslow Capital Management first reported a position in ALNY in Q3 2024 and held it in 6 quarters. The position peaked at $384M in Q2 2025. 791 funds tracked by Wall St. Rank hold ALNY as of Q1 2026.

  • Winslow Capital Management reported no remaining Alnylam Pharmaceuticals position as of Q1 2026 after selling out during the quarter.
  • Winslow Capital Management sold 1,266 Alnylam Pharmaceuticals shares in Q1 2026, an estimated $503K.
  • Winslow Capital Management first reported a position in Alnylam Pharmaceuticals in Q3 2024 and held it in 6 quarters.
  • Winslow Capital Management's Alnylam Pharmaceuticals position peaked at $384M in Q2 2025.
  • 791 funds tracked by Wall St. Rank held Alnylam Pharmaceuticals as of Q1 2026.

Based on Winslow Capital Management's 13F filing for Q1 2026, filed 14 May 2026.