The current institutional shareholding score of Alnylam Pharmaceuticals Inc is 10.00, ranking 1 out of 157 in the Pharmaceuticals industry. The latest institutional shareholding proportion is 100.11%, representing a quarter-over-quarter decrease of 1.92%. The largest institutional shareholder is ETHSX, holding a total of 444.37K shares, representing 0.30% of shares outstanding, with 3388.37% increase in holdings.