SEC 13F Intelligence

American Century Companies Inc / ALNY

American Century Companies Inc’s Alnylam Pharmaceuticals Inc Position

Does American Century Companies Inc own Alnylam Pharmaceuticals Inc (ALNY)? Yes — 1.80M shares worth $596M (+0.31% of its 13F portfolio) as of Q1 2026, up from 1.49M shares the prior filed quarter.

Position Value
$596M
Q1 2026
Shares
1.80M
% of Portfolio
+0.31%
Quarters Held
30
currently held

Position History ALNY

Reported value by quarter
Q4 ’18: $51MQ4 ’18Q1 ’19: $66MQ2 ’19: $24MQ3 ’19: $24MQ4 ’19: $32MQ4 ’19Q1 ’20: $44MQ2 ’20: $148MQ3 ’20: $144MQ4 ’20: $140MQ4 ’20Q1 ’21: $155MQ2 ’21: $177MQ3 ’21: $202MQ4 ’21: $170MQ4 ’21Q1 ’22: $185MQ2 ’22: $84MQ3 ’22: $139MQ4 ’22: $166MQ4 ’22Q1 ’23: $85MQ2 ’23: $83MQ3 ’23: $78MQ4 ’23: $79MQ4 ’23Q1 ’24: $205MQ2 ’24: $329MQ3 ’24: $438MQ4 ’24: $377MQ4 ’24Q1 ’25: $475MQ2 ’25: $585MQ3 ’25: $748MQ4 ’25: $591MQ4 ’25Q1 ’26: $596Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 20261.80M$596M+0.31%
Q4 20251.49M$591M+0.30%
Q3 20251.64M$748M+0.38%
Q2 20251.79M$585M+0.32%
Q1 20251.76M$475M+0.29%
Q4 20241.60M$377M+0.22%
Q3 20241.59M$438M+0.25%
Q2 20241.35M$329M+0.20%
Q1 20241.37M$205M+0.13%
Q4 2023414.9K$79M+0.05%
Q3 2023442.7K$78M+0.06%
Q2 2023438.9K$83M+0.06%
Q1 2023444.6K$85M+0.07%
Q4 2022699.8K$166M+0.14%
Q3 2022693.0K$139M+0.12%
Q2 2022574.9K$84M+0.07%
Q1 20221.13M$185M+0.13%
Q4 20211.00M$170M+0.11%
Q3 20211.07M$202M+0.14%
Q2 20211.05M$177M+0.12%
Q1 20211.09M$155M+0.11%
Q4 20201.08M$140M+0.11%
Q3 2020989.3K$144M+0.13%
Q2 2020997.2K$148M+0.14%
Q1 2020406.6K$44M+0.05%
Q4 2019275.5K$32M+0.03%
Q3 2019293.6K$24M+0.02%
Q2 2019332.7K$24M+0.02%
Q1 2019710.9K$66M+0.07%
Q4 2018693.2K$51M+0.06%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See American Century Companies Inc’s full portfolio or all institutional holders of ALNY.