CAMBRIDGE, MA
ALNYLAM PHARMACEUTICALS, INC.ALNY— Latest position per institution from SEC 13F filings
15
Institutional holders
112.26M
Total shares held
35.73B
Estimated value
5.61M
Avg. position size
FMR LLC
CIK 315066
Shares
14.58M
Value
4.82B
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
13.55M
Value
5.39B
Filed
Dec 31, 2025
CAPITAL WORLD INVESTORS
CIK 1422849
Shares
10.80M
Value
3.57B
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
10.44M
Value
3.46B
Filed
Mar 31, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
9.55M
Value
2.32B
Filed
Jun 30, 2024
CAPITAL RESEARCH GLOBAL INVESTORS
CIK 1422848
Shares
9.47M
Value
3.13B
Filed
Mar 31, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
6.49M
Value
2.15B
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
5.95M
Value
1.97B
Filed
Mar 31, 2026
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.
CIK 1897612
Shares
5.19M
Value
1.72M
Filed
Mar 31, 2026
JPMORGAN CHASE & CO
CIK 19617
Shares
4.72M
Value
1.88B
Filed
Dec 31, 2025
STATE STREET CORP
CIK 93751
Shares
3.32M
Value
1.10B
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
2.66M
Value
884.57M
Filed
Mar 31, 2026
BAILLIE GIFFORD & CO
CIK 1088875
Shares
2.49M
Value
825.15M
Filed
Mar 31, 2026
NORGES BANK
CIK 1374170
Shares
2.25M
Value
895.82M
Filed
Dec 31, 2025
TWO SIGMA INVESTMENTS, LP
CIK 1179392
Shares
1.99M
Value
659.28M
Filed
Mar 31, 2026
WELLINGTON MANAGEMENT GROUP LLP
CIK 902219
Shares
1.94M
Value
640.54M
Filed
Mar 31, 2026
DODGE & COX
CIK 200217
Shares
1.93M
Value
638.33M
Filed
Mar 31, 2026
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
1.80M
Value
596.35M
Filed
Mar 31, 2026
RTW INVESTMENTS, LP
CIK 1493215
Shares
1.64M
Value
314.02M
Filed
Dec 31, 2023
D. E. SHAW & CO., INC.
CIK 1009207
Shares
1.47M
Value
487.82M
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | FMR LLC | 315066 | 14.58M | 4.82B | Mar 31, 2026 |
| 2 | VANGUARD GROUP INC | 102909 | 13.55M | 5.39B | Dec 31, 2025 |
| 3 | CAPITAL WORLD INVESTORS | 1422849 | 10.80M | 3.57B | Mar 31, 2026 |
| 4 | BLACKROCK, INC. | 2012383 | 10.44M | 3.46B | Mar 31, 2026 |
| 5 | BLACKROCK FINANCE, INC. | 1364742 | 9.55M | 2.32B | Jun 30, 2024 |
| 6 | CAPITAL RESEARCH GLOBAL INVESTORS | 1422848 | 9.47M | 3.13B | Mar 31, 2026 |
| 7 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 6.49M | 2.15B | Mar 31, 2026 |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 5.95M | 1.97B | Mar 31, 2026 |
| 9 | T. ROWE PRICE INVESTMENT MANAGEMENT, INC. | 1897612 | 5.19M | 1.72M | Mar 31, 2026 |
| 10 | JPMORGAN CHASE & CO | 19617 | 4.72M | 1.88B | Dec 31, 2025 |
| 11 | STATE STREET CORP | 93751 | 3.32M | 1.10B | Mar 31, 2026 |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 2.66M | 884.57M | Mar 31, 2026 |
| 13 | BAILLIE GIFFORD & CO | 1088875 | 2.49M | 825.15M | Mar 31, 2026 |
| 14 | NORGES BANK | 1374170 | 2.25M | 895.82M | Dec 31, 2025 |
| 15 | TWO SIGMA INVESTMENTS, LP | 1179392 | 1.99M | 659.28M | Mar 31, 2026 |
| 16 | WELLINGTON MANAGEMENT GROUP LLP | 902219 | 1.94M | 640.54M | Mar 31, 2026 |
| 17 | DODGE & COX | 200217 | 1.93M | 638.33M | Mar 31, 2026 |
| 18 | AMERICAN CENTURY COMPANIES INC | 748054 | 1.80M | 596.35M | Mar 31, 2026 |
| 19 | RTW INVESTMENTS, LP | 1493215 | 1.64M | 314.02M | Dec 31, 2023 |
| 20 | D. E. SHAW & CO., INC. | 1009207 | 1.47M | 487.82M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.