SEC 13F Intelligence

Rtw Investments, LP / ALNY

Rtw Investments, LP’s Alnylam Pharmaceuticals Inc Position

Does Rtw Investments, LP own Alnylam Pharmaceuticals Inc (ALNY)? Not currently — the last reported position was 1.64M shares worth $314M in Q4 2023; the fund’s latest 13F (Q1 2026) no longer reports it.

Position Value
$314M
Q4 2023
Shares
1.64M
% of Portfolio
+4.91%
Quarters Held
21
position exited

Position History ALNY

Reported value by quarter
Q4 ’18: $32MQ4 ’18Q1 ’19: $78MQ2 ’19: $159MQ3 ’19: $142MQ3 ’19Q4 ’19: $189MQ1 ’20: $183MQ2 ’20: $249MQ2 ’20Q3 ’20: $245MQ4 ’20: $219MQ1 ’21: $238MQ1 ’21Q2 ’21: $285MQ3 ’21: $318MQ4 ’21: $335MQ4 ’21Q1 ’22: $275MQ2 ’22: $246MQ3 ’22: $337MQ3 ’22Q4 ’22: $400MQ1 ’23: $337MQ2 ’23: $320MQ2 ’23Q3 ’23: $298MQ4 ’23: $314Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q4 20231.64M$314M+4.91%
Q3 20231.68M$298M+6.29%
Q2 20231.68M$320M+6.09%
Q1 20231.68M$337M+7.02%
Q4 20221.68M$400M+8.17%
Q3 20221.68M$337M+7.77%
Q2 20221.68M$246M+6.34%
Q1 20221.68M$275M+5.69%
Q4 20211.98M$335M+4.89%
Q3 20211.68M$318M+4.79%
Q2 20211.68M$285M+4.31%
Q1 20211.68M$238M+3.71%
Q4 20201.68M$219M+3.67%
Q3 20201.68M$245M+5.90%
Q2 20201.68M$249M+7.01%
Q1 20201.68M$183M+7.88%
Q4 20191.64M$189M+7.12%
Q3 20191.77M$142M+8.45%
Q2 20192.20M$159M+8.52%
Q1 2019835.9K$78M+5.33%
Q4 2018439.5K$32M+2.94%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Rtw Investments, LP’s full portfolio or all institutional holders of ALNY.