How Many People Work at Alector? Headcount and Employee Trends

Alector is a biotechnology company that applies immuno-neurology science to develop therapies for neurodegenerative diseases. The organization employs just over 200 people and has recorded modest hiring alongside a higher level of departures, resulting in a leaner current workforce. This headcount mix suggests the company is maintaining core scientific operations while recalibrating overall staffing levels.

Engineering is the largest group at Alector with roughly one-third of all employees, highlighting the importance of research, development, and technology in the firm’s drug-discovery pipeline. Additional scientific talent sits in the Healthcare function, while Business Management and Operations collectively account for more than 20% of staff and provide day-to-day corporate support. Finance & Administration and Human Resources maintain midsize teams, and smaller groups in Sales & Support, Risk & Compliance, and Legal round out the headcount. The current structure indicates a primary emphasis on R&D, backed by focused commercial and support capabilities.

Alector’s footprint is heavily concentrated in San Francisco, which hosts more than half of the company’s employees and serves as its headquarters and primary research hub. Secondary offices across several California cities—San Diego, San Jose, Los Angeles, and Redwood City—add small clusters of staff, reinforcing the firm’s West Coast presence. A handful of employees work in Denver, Philadelphia, Sunnyvale, and Seattle, while the remaining personnel are dispersed in other remote or satellite locations. This distribution underscores a centralized approach anchored in the Bay Area with flexible support from smaller sites.