Biotechnology Value Fund (BVF) Reports 8.4% Stake in Alector, Inc. (ALEC)

On September 18, 2026, Biotechnology Value Fund, L.P. (BVF) and its affiliated reporting persons, including Mark N. Lampert, filed a Schedule 13G regarding their holdings in Alector, Inc. (ALEC). The filing indicates that the reporting group collectively beneficially owns 9,374,267 shares of Common Stock, representing approximately 8.4% of the company's outstanding shares based on the share count as of July 31, 2026. The aggregate ownership is distributed across several entities: BVF holds 4,900,143 shares (4.4%), Biotechnology Value Fund II, L.P. holds 3,671,016 shares (3.3%), and Biotechnology Value Trading Fund OS LP holds 619,317 shares (0.6%). Additionally, 183,791 shares are held in a Partners Managed Account. BVF Partners L.P., BVF Inc., and Mr. Lampert may be deemed to share beneficial ownership of the total 9,374,267 shares. The filing was triggered by an event on September 11, 2026, and the reporting persons have certified that the acquisition was not intended to influence or change the control of the issuer.