ALNYLAM PHARMACEUTICALS INC

Ticker: ALNY CUSIP: 02043Q107 Class: EQTY

Capital World Investors's Holding History (CIK: 0001422849)

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

Q4 2025

Shares 16,301,772 Value ($000) $6,482,389 Avg Close $442.56 Range $387.03 - $495.55

Q3 2025

Shares 16,434,253 Value ($000) $7,493,808 Avg Close $407.20 Range $309.57 - $484.21

Q2 2025

Shares 16,805,007 Value ($000) $5,479,867 Avg Close $276.71 Range $205.87 - $327.21

Q1 2025

Shares 16,749,623 Value ($000) $4,522,699 Avg Close $257.00 Range $230.79 - $300.90

Q4 2024

Shares 16,600,525 Value ($000) $3,906,284 Avg Close $262.99 Range $229.86 - $304.39

Q3 2024

Shares 16,508,424 Value ($000) $4,540,309 Avg Close $260.36 Range $231.01 - $287.55

Q2 2024

Shares 14,971,343 Value ($000) $3,638,105 Avg Close $157.87 Range $141.98 - $252.87

Q1 2024

Shares 12,789,236 Value ($000) $1,911,351 Avg Close $166.82 Range $143.52 - $199.38

Q4 2023

Shares 16,174,563 Value ($000) $3,096,024 Avg Close $170.34 Range $148.10 - $198.00

Q3 2023

Shares 16,529,308 Value ($000) $2,927,298 Avg Close $191.12 Range $168.65 - $218.88

Q2 2023

Shares 16,497,551 Value ($000) $3,133,561 Avg Close $198.26 Range $183.00 - $212.47

Q1 2023

Shares 16,476,201 Value ($000) $3,300,443 Avg Close $210.20 Range $179.19 - $242.39

Q4 2022

Shares 16,390,275 Value ($000) $3,895,155 Avg Close $213.29 Range $181.65 - $242.97

Q3 2022

Shares 13,949,647 Value ($000) $2,792,252 Avg Close $190.74 Range $135.46 - $236.80

Q2 2022

Shares 10,291,012 Value ($000) $1,500,944 Avg Close $141.87 Range $117.58 - $180.35

Q1 2022

Shares 5,999,674 Value ($000) $979,687 Avg Close $152.35 Range $125.00 - $174.66

Q4 2021

Shares 318,946 Value ($000) $54,087 Avg Close $185.86 Range $154.82 - $212.00

Q3 2021

Shares 318,946 Value ($000) $60,220 Avg Close $187.58 Range $166.16 - $209.73

Q2 2021

Shares 318,946 Value ($000) $54,068 Avg Close $146.46 Range $125.08 - $177.53

Q1 2021

Shares 352,546 Value ($000) $49,776 Avg Close $150.49 Range $124.00 - $178.41

Q4 2020

Shares 352,546 Value ($000) $45,820 Avg Close $133.53 Range $119.29 - $148.76

Q3 2020

Shares 352,546 Value ($000) $51,331 Avg Close $142.10 Range $119.67 - $167.33

Q2 2020

Shares 352,546 Value ($000) $52,216 Avg Close $134.81 Range $98.01 - $158.37

Q1 2020

Shares 352,546 Value ($000) $38,375 Avg Close $115.43 Range $84.97 - $134.51

Q4 2019

Shares 137,700 Value ($000) $15,859 Avg Close $99.70 Range $73.32 - $125.72

Q3 2019

Shares 137,700 Value ($000) $11,074 Avg Close $79.11 Range $69.11 - $88.00

Q2 2019

Shares 137,700 Value ($000) $9,992 Avg Close $76.72 Range $65.81 - $96.08

Q1 2019

Shares 137,700 Value ($000) $12,868 Avg Close $83.64 Range $70.29 - $93.95

Q4 2018

Shares 137,700 Value ($000) $10,040 Avg Close $76.92 Range $60.27 - $90.00

Q3 2018

Shares 137,700 Value ($000) $12,052 Avg Close $100.59 Range $86.95 - $124.22

Q2 2018

Shares 137,700 Value ($000) $13,562 Avg Close $99.19 Range $87.35 - $118.71

Q1 2018

Shares 137,700 Value ($000) $16,400 Avg Close $128.92 Range $108.13 - $153.99

Q4 2017

Shares 137,700 Value ($000) $17,495 Avg Close $125.65 Range $111.25 - $147.63

Q3 2017

Shares 137,700 Value ($000) $16,178 Avg Close $85.36 Range $70.76 - $119.02

Q2 2017

Shares 137,700 Value ($000) $10,983 Avg Close $63.91 Range $46.90 - $86.92

Q1 2017

Shares 137,700 Value ($000) $7,057 Avg Close $46.22 Range $35.98 - $60.41

Q4 2016

Shares 137,700 Value ($000) $5,155 Avg Close $41.87 Range $31.38 - $71.67

Q3 2016

Shares 573,700 Value ($000) $38,885 Avg Close $70.55 Range $53.56 - $80.11

Q2 2016

Shares 573,700 Value ($000) $31,835 Avg Close $63.00 Range $49.96 - $75.08

Q1 2016

Shares 1,938,603 Value ($000) $121,686 Avg Close $66.49 Range $51.51 - $98.00

Q4 2015

Shares 1,938,603 Value ($000) $182,500 Avg Close $92.72 Range $71.14 - $110.75

Q3 2015

Shares 1,943,603 Value ($000) $156,188 Avg Close $111.10 Range $76.46 - $137.89

Q2 2015

Shares 2,056,603 Value ($000) $246,525 Avg Close $119.50 Range $98.63 - $140.00

Q1 2015

Shares 2,138,700 Value ($000) $223,323 Avg Close $101.34 Range $82.06 - $121.93

Q4 2014

Shares 965,312 Value ($000) $93,635 Avg Close $92.65 Range $72.80 - $111.49

Q3 2014

Shares 848,700 Value ($000) $66,283 Avg Close $64.51 Range $51.93 - $79.88

Q2 2014

Shares 848,700 Value ($000) $53,612 Avg Close $59.44 Range $47.03 - $71.40

Q1 2014

Shares 864,700 Value ($000) $58,056 Avg Close $77.42 Range $60.24 - $112.57

Q4 2013

Shares 1,054,700 Value ($000) $67,849 Avg Close $59.65 Range $48.16 - $67.97

Q3 2013

Shares 1,213,000 Value ($000) $77,644 Avg Close $49.85 Range $31.75 - $65.83

Q2 2013

Shares 1,700,000 Value ($000) $52,717 Avg Close $26.61 Range $21.60 - $31.79

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	16,301,772	$6,482,389	$442.56	$387.03 - $495.55
Q3 2025	16,434,253	$7,493,808	$407.20	$309.57 - $484.21
Q2 2025	16,805,007	$5,479,867	$276.71	$205.87 - $327.21
Q1 2025	16,749,623	$4,522,699	$257.00	$230.79 - $300.90
Q4 2024	16,600,525	$3,906,284	$262.99	$229.86 - $304.39
Q3 2024	16,508,424	$4,540,309	$260.36	$231.01 - $287.55
Q2 2024	14,971,343	$3,638,105	$157.87	$141.98 - $252.87
Q1 2024	12,789,236	$1,911,351	$166.82	$143.52 - $199.38
Q4 2023	16,174,563	$3,096,024	$170.34	$148.10 - $198.00
Q3 2023	16,529,308	$2,927,298	$191.12	$168.65 - $218.88
Q2 2023	16,497,551	$3,133,561	$198.26	$183.00 - $212.47
Q1 2023	16,476,201	$3,300,443	$210.20	$179.19 - $242.39
Q4 2022	16,390,275	$3,895,155	$213.29	$181.65 - $242.97
Q3 2022	13,949,647	$2,792,252	$190.74	$135.46 - $236.80
Q2 2022	10,291,012	$1,500,944	$141.87	$117.58 - $180.35
Q1 2022	5,999,674	$979,687	$152.35	$125.00 - $174.66
Q4 2021	318,946	$54,087	$185.86	$154.82 - $212.00
Q3 2021	318,946	$60,220	$187.58	$166.16 - $209.73
Q2 2021	318,946	$54,068	$146.46	$125.08 - $177.53
Q1 2021	352,546	$49,776	$150.49	$124.00 - $178.41
Q4 2020	352,546	$45,820	$133.53	$119.29 - $148.76
Q3 2020	352,546	$51,331	$142.10	$119.67 - $167.33
Q2 2020	352,546	$52,216	$134.81	$98.01 - $158.37
Q1 2020	352,546	$38,375	$115.43	$84.97 - $134.51
Q4 2019	137,700	$15,859	$99.70	$73.32 - $125.72
Q3 2019	137,700	$11,074	$79.11	$69.11 - $88.00
Q2 2019	137,700	$9,992	$76.72	$65.81 - $96.08
Q1 2019	137,700	$12,868	$83.64	$70.29 - $93.95
Q4 2018	137,700	$10,040	$76.92	$60.27 - $90.00
Q3 2018	137,700	$12,052	$100.59	$86.95 - $124.22
Q2 2018	137,700	$13,562	$99.19	$87.35 - $118.71
Q1 2018	137,700	$16,400	$128.92	$108.13 - $153.99
Q4 2017	137,700	$17,495	$125.65	$111.25 - $147.63
Q3 2017	137,700	$16,178	$85.36	$70.76 - $119.02
Q2 2017	137,700	$10,983	$63.91	$46.90 - $86.92
Q1 2017	137,700	$7,057	$46.22	$35.98 - $60.41
Q4 2016	137,700	$5,155	$41.87	$31.38 - $71.67
Q3 2016	573,700	$38,885	$70.55	$53.56 - $80.11
Q2 2016	573,700	$31,835	$63.00	$49.96 - $75.08
Q1 2016	1,938,603	$121,686	$66.49	$51.51 - $98.00
Q4 2015	1,938,603	$182,500	$92.72	$71.14 - $110.75
Q3 2015	1,943,603	$156,188	$111.10	$76.46 - $137.89
Q2 2015	2,056,603	$246,525	$119.50	$98.63 - $140.00
Q1 2015	2,138,700	$223,323	$101.34	$82.06 - $121.93
Q4 2014	965,312	$93,635	$92.65	$72.80 - $111.49
Q3 2014	848,700	$66,283	$64.51	$51.93 - $79.88
Q2 2014	848,700	$53,612	$59.44	$47.03 - $71.40
Q1 2014	864,700	$58,056	$77.42	$60.24 - $112.57
Q4 2013	1,054,700	$67,849	$59.65	$48.16 - $67.97
Q3 2013	1,213,000	$77,644	$49.85	$31.75 - $65.83
Q2 2013	1,700,000	$52,717	$26.61	$21.60 - $31.79