The current institutional shareholding score of Alector Inc is 7.00, ranking 81 out of 389 in the Biotechnology & Medical Research industry. The latest institutional shareholding proportion is 80.95%, representing a quarter-over-quarter decrease of 17.91%. The largest institutional shareholder is James Simons, holding a total of 0.00 shares, representing 1.16% of shares outstanding, with 0.02% increase in holdings.