# Arsenal Biosciences, Inc.: permanent layoff, 58 employees in South San Francisco, CA

**Score:** 37/100

| Field | Value |
|---|---|
| Employer | Arsenal Biosciences, Inc. |
| Notice | Permanent layoff |
| Employees affected | 58 |
| Site | 329 Oyster Point Blvd South San Francisco CA 94080 |
| County | San Mateo County |
| Industry | 54 Professional Scientific and Technical Services |
| Notice date | 2026-08-31 |
| Effective date | 2026-10-29 |

## Why this score
- 58 employees affected.

Source: California EDD WARN report, Maryland Department of Labor WARN log and Texas Workforce Commission WARN notices (https://edd.ca.gov/en/jobs_and_training/Layoff_Services_WARN). Last refreshed: 2026-11-04T09:18:45.061Z.
From public WARN notices published by the California EDD, the Maryland Department of Labor and the Texas Workforce Commission (Texas does not publish notice type or industry). A WARN notice reports a planned layoff or closure as filed by the employer; plans can change. Employer and site level only: we never list individual employees.