Alector, INC Schedule 13G passive stakes

Polaris Venture Partners entities and associated individuals have updated their beneficial ownership filings for Alector, Inc., reflecting holdings as of April 30, 2026.

BlackRock, Inc. has reported beneficial ownership of 5.2% of Alector, Inc.'s common stock as of March 31, 2026.

The Vanguard Group has reported a 0% beneficial ownership in Alector Inc. common stock following an internal realignment.

RTW Investments, LP and Roderick Wong, M.D. have reported 0% beneficial ownership in Alector, Inc., indicating a complete divestment of their previous holdings.

Arnon Rosenthal, a key insider at Alector, Inc., reported beneficial ownership of 7.4% of the company's common stock as of December 31, 2025.

The Vanguard Group has filed an amended Schedule 13G, disclosing a 6.32% beneficial ownership stake in Alector Inc. as of December 31, 2025.

BlackRock, Inc. has filed an amended Schedule 13G, disclosing a beneficial ownership of 4.7% of Alector, Inc.'s common stock as of December 31, 2025.

TCG Crossover Fund II, L.P., TCG Crossover Fund III, L.P., and their related entities, along with Chen Yu, have reported a combined beneficial ownership of 9.2% in Alector, Inc.

RTW Investments, LP and Roderick Wong, M.D. have filed a Schedule 13G disclosing beneficial ownership of 6.9% of Alector, Inc.'s common stock.

Polaris Venture Partners and its affiliates have filed an Amendment No. 6 to their Schedule 13G, disclosing their updated passive beneficial ownership in Alector, Inc. common stock.

FMR LLC and Abigail P. Johnson have reduced their beneficial ownership in Alector Inc. to 3.6% of common stock, triggering an amended Schedule 13G filing.

BlackRock, Inc. has filed an amended Schedule 13G, reporting a 5.1% beneficial ownership stake in Alector, Inc. as of September 30, 2025.

RA Capital Management and its affiliates have filed an amended Schedule 13G, indicating they no longer hold beneficial ownership in Alector, Inc.

BlackRock, Inc. has filed an Amendment No. 4 to Schedule 13G, reporting a 6.2% beneficial ownership stake in Alector Inc. as of March 31, 2025.