Arsenal Biosciences, Inc. Layoff — November 2025
SOURCEOFFICIAL FILINGCalifornia Employment Development Department· filed September 16, 2025View the filing ↗
What we know
Location: South San Francisco, CA (San Mateo County).
A WARN notice for this layoff is recorded on September 16, 2025.
Disclosed through an official WARN filing with the CA state workforce agency.
Summary
Arsenal Biosciences, Inc. disclosed this layoff in an official WARN (Worker Adjustment and Retraining Notification) notice recorded by the CA state workforce agency on September 16, 2025. The notice covers 100 employees in South San Francisco, CA (San Mateo County), with the layoff effective November 14, 2025.
LayoffTalk has tracked 4 layoff events at Arsenal Biosciences, Inc. since September 2025, including 100 jobs documented in official WARN filings, with 3 additional events known from news reporting.
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