ALNYLAM PHARMACEUTICALS INC

Ticker: ALNY CUSIP: 02043Q107 Class: EQTY

Rock Springs Capital Management LP's Holding History (CIK: 0001595725)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 71,250 Value ($000) $28,333 Avg Close $442.56 Range $387.03 - $495.55
Q3 2025
Shares 74,250 Value ($000) $33,858 Avg Close $407.20 Range $309.57 - $484.21
Q2 2025
Shares 100,000 Value ($000) $32,609 Avg Close $276.71 Range $205.87 - $327.21
Q1 2025
Shares 143,250 Value ($000) $38,680 Avg Close $257.00 Range $230.79 - $300.90
Q4 2024
Shares 256,200 Value ($000) $60,286 Avg Close $262.99 Range $229.86 - $304.39
Q3 2024
Shares 250,000 Value ($000) $68,758 Avg Close $260.36 Range $231.01 - $287.55
Q2 2024
Shares 250,000 Value ($000) $60,750 Avg Close $157.87 Range $141.98 - $252.87
Q1 2024
Shares 244,000 Value ($000) $36,466 Avg Close $166.82 Range $143.52 - $199.38
Q4 2023
Shares 235,000 Value ($000) $44,981 Avg Close $170.34 Range $148.10 - $198.00
Q3 2023
Shares 279,500 Value ($000) $49,499 Avg Close $191.12 Range $168.65 - $218.88
Q2 2023
Shares 345,000 Value ($000) $65,529 Avg Close $198.26 Range $183.00 - $212.47
Q1 2023
Shares 345,000 Value ($000) $69,110 Avg Close $210.20 Range $179.19 - $242.39
Q4 2022
Shares 332,500 Value ($000) $79,019 Avg Close $213.29 Range $181.65 - $242.97
Q3 2022
Shares 332,500 Value ($000) $66,553 Avg Close $190.74 Range $135.46 - $236.80
Q2 2022
Shares 332,500 Value ($000) $48,495 Avg Close $141.87 Range $117.58 - $180.35
Q1 2022
Shares 332,500 Value ($000) $54,294 Avg Close $152.35 Range $125.00 - $174.66
Q4 2021
Shares 332,500 Value ($000) $56,385 Avg Close $185.86 Range $154.82 - $212.00
Q3 2021
Shares 311,000 Value ($000) $58,720 Avg Close $187.58 Range $166.16 - $209.73
Q2 2021
Shares 300,000 Value ($000) $50,856 Avg Close $146.46 Range $125.08 - $177.53
Q1 2021
Shares 300,000 Value ($000) $42,357 Avg Close $150.49 Range $124.00 - $178.41
Q4 2020
Shares 335,000 Value ($000) $43,540 Avg Close $133.53 Range $119.29 - $148.76
Q3 2020
Shares 339,814 Value ($000) $49,477 Avg Close $142.10 Range $119.67 - $167.33
Q2 2020
Shares 345,000 Value ($000) $51,098 Avg Close $134.81 Range $98.01 - $158.37
Q1 2020
Shares 381,500 Value ($000) $41,526 Avg Close $115.43 Range $84.97 - $134.51
Q4 2019
Shares 364,000 Value ($000) $41,922 Avg Close $99.70 Range $73.32 - $125.72
Q3 2019
Shares 330,500 Value ($000) $26,579 Avg Close $79.11 Range $69.11 - $88.00
Q2 2019
Shares 327,700 Value ($000) $23,778 Avg Close $76.72 Range $65.81 - $96.08
Q1 2019
Shares 233,500 Value ($000) $21,821 Avg Close $83.64 Range $70.29 - $93.95
Q4 2018
Shares 194,000 Value ($000) $14,145 Avg Close $76.92 Range $60.27 - $90.00
Q3 2018
Shares 196,500 Value ($000) $17,198 Avg Close $100.59 Range $86.95 - $124.22
Q2 2018
Shares 173,500 Value ($000) $17,088 Avg Close $99.19 Range $87.35 - $118.71
Q1 2018
Shares 143,000 Value ($000) $17,031 Avg Close $128.92 Range $108.13 - $153.99
Q4 2017
Shares 130,000 Value ($000) $16,517 Avg Close $125.65 Range $111.25 - $147.63
Q3 2017
Shares 105,000 Value ($000) $12,336 Avg Close $85.36 Range $70.76 - $119.02
Q2 2017
Shares 105,000 Value ($000) $8,375 Avg Close $63.91 Range $46.90 - $86.92