Arsenal Biosciences layoffs — LayoffCheck https://layoffcheck.com/companies/arsenal-biosciences Layoff and WARN notices reported for Arsenal Biosciences. en-us Arsenal Biosciences cut 100 employees (September 16, 2025) https://layoffcheck.com/companies/arsenal-biosciences#2025-09 https://layoffcheck.com/companies/arsenal-biosciences#2025-09-7455 Tue, 16 Sep 2025 12:00:00 GMT Arsenal Biosciences reported a workforce reduction in South San Francisco, CA in September 16, 2025.