Employer · WARN Act history · Professional & Technical Services
Arsenal Biosciences
100 workers across 1 WARN notice, primarily in CA - recorded in the current PlainLayoffs dataset.
- 100
- Workers cut
- 1
- WARN notice
- 1
- State
- 100
- Avg / notice
Arsenal Biosciences has 1 recorded WARN filing affecting 100 workers
According to WARN Act filings submitted to state workforce agencies, Arsenal Biosciences has 1 recorded filing covering 100 workers across 1 state, primarily CA, the 2,555th-largest recorded WARN footprint among 7,009 tracked employers. WARN notices cover qualifying reported events, so this record is not a complete count of the employer's workforce changes.
Arsenal Biosciences is a minor share of Professional & Technical Services WARN activity — 0.5% of the sector's 21,639 workers across 166 employers, ranking #57 in Professional & Technical Services.
DOL WARN employer filing desk
Employer ARSENAL-BIOS · Arsenal Biosciences 100 workers · 1 filings
NOTC-SINGLE · WORK-LIGHT · PHOTO-UNK · RUNWAY-UNK · STAT-SINGLE · BOOK-SINGLE · TYPE-LAYOFF
- NOTC-SINGLE 1 filing
- WORK-LIGHT #2,555
- PHOTO-UNK No peer
- RUNWAY-UNK Runway n/a
- STAT-SINGLE CA
- BOOK-SINGLE 1 agency
- TYPE-LAYOFF 1 layoff
Stamps derive from filed notice_date, effective_date, workers_affected, state agency source, and filing type in this dataset, not a prediction of future layoffs.
Employer Profile
Not all layoffs appear in WARN data, see our methodology for the federal + state coverage thresholds. Latest filing: Sep 2025.
WARN Notice History
2025
South San Francisco, CA · Professional & Technical Services
Effective: Sep 16, 2025
100
workers
Filed Sep 16, 2025
Four checks on this Arsenal Biosciences filing
What is the largest Arsenal Biosciences WARN filing on record? ▼
The largest row is the mass layoff filed for South San Francisco, CA on Sep 16, 2025, covering 100 workers in Professional & Technical Services.
Where were Arsenal Biosciences's WARN notices filed? ▼
This is a one-event record from California EDD; the named location is South San Francisco, not a company-wide headcount change. States represented in this record: CA.
Does Arsenal Biosciences's filing history show a recurring pattern? ▼
One filing cannot establish a recurring layoff cadence. It records a specific WARN-covered event and should not be read as a forecast of this employer's workforce.
How much advance notice appears in Arsenal Biosciences's record? ▼
No trustworthy advance-notice runway can be derived from these rows because the source dates are equal, missing, or retroactive.
See also: CA WARN filings · Professional & Technical Services industry WARNs · WARN Act guide
Source: State WARN Act layoff registries Arsenal Biosciences notice history aggregated from state workforce agency filings · September 2026 A WARN filing is a required notice, not a judgment of the employer's management or finances. Coverage follows states with structured public registries; this public-record summary is not legal advice, financial advice, or employment advice.
Every figure on PlainLayoffs is rendered directly from public WARN Act filings and state workforce agency records, no number is typed in by an editor. This employer's notice history is rendered directly from state WARN Act filings. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 2026. A WARN filing is a legally required notice, not a judgment of a company's management or financial health; rankings here reflect filed notice volume only.