Arsenal Biosciences Layoffs & WARN Notices — 158 Workers Affected
All WARN Act mass layoff and plant closure notices filed by Arsenal Biosciences.
Data updated
2
Total Notices
158
Workers Affected
1
States
2025
First Filing
2026
Latest Filing
Arsenal Biosciences WARN Act Filings
| Company | Location | Employees | Notice Date | Type |
|---|---|---|---|---|
| Arsenal Biosciences | South San Francisco, CA | 58 | ||
| Arsenal Biosciences | South San Francisco, CA | 100 | Layoff |
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Arsenal Biosciences Layoff FAQ
Is Arsenal Biosciences laying off in 2026?
Yes. Arsenal Biosciences has filed 1 WARN Act notice in 2026 affecting 58 workers. See the filings table above for locations and dates.
How many layoffs has Arsenal Biosciences had?
Arsenal Biosciences has filed 2 WARN Act notices affecting a total of 158 workers across 1 state.
When was Arsenal Biosciences's most recent layoff?
Arsenal Biosciences's most recent WARN Act filing was on 2026-08-31.
What states has Arsenal Biosciences laid off workers in?
Arsenal Biosciences has filed WARN Act notices in: California.
What is the WARN Act?
The Worker Adjustment and Retraining Notification (WARN) Act is a federal law that requires employers with 100 or more employees to provide 60 calendar days' advance notice of plant closings and mass layoffs.
How do I get notified about Arsenal Biosciences layoffs?
Subscribe using the form above to receive free daily email alerts whenever new WARN Act notices are filed. You can also set up custom filters and webhooks with a paid API plan at warnfirehose.com/pricing.
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SEC Filings & Hiring Signals
Cross-dataset signals for Arsenal Biosciences: SEC 8-K event filings and H-1B labor condition applications often move before and after WARN notices.
6 H-1B LCA petitions filed (FY2019–FY2026) — check H-1B layoff risk →
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