58 employees in South San Francisco, CA are covered by the one WARN layoff or closure notice Arsenal Biosciences, Inc. has on file as of November 6, 2026, dated August 31, 2026, effective October 29, 2026 (California WARN notice, August 31, 2026).
12 companies announced layoffs this week.
Companies cutting jobs this week. Before you unlock: the company, the number of employees and what is inside. After: every way we found to reach the company. No individual is named in a layoff.
| Artiva Biotherapeutics, Inc. | announced layoffs | |
| Eos Energy Enterprises, Inc. | announced layoffs | |
| SOUNDHOUND AI, INC. | announced layoffs | |
| Portillo's Inc. | announced layoffs | |
| Acumen Pharmaceuticals, Inc. | announced layoffs of about 52 employees |
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Arsenal Biosciences, Inc. filed 1 WARN notice in California, covering 58 employees in total. Each notice below links to the state file it was published in.
Did Arsenal Biosciences, Inc. have layoffs in 2026? Every notice
| Notice | Where | Employees | Type | Effective | Industry | Days' notice | Source |
|---|---|---|---|---|---|---|---|
| 2026-08-31 | South San Francisco, CA | 58 | layoff, permanent | 2026-10-29 | Professional Scientific and Technical Services | 59 | CA file |
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Other layoffs like this
Layoff notices in California filed under Professional Scientific and Technical Services, Q3 2026, most jobs first.
- ServiceNow, Inc. (133 jobs, Jul 2026)
- Coursera, Inc. (31 jobs, Jul 2026)
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Fundraising on record
Arsenal Biosciences, Inc. also appears in SEC Form D filings under the same name in the same state (1 filing on record). Its most recent raise before this notice reported $325.35M sold, filed 2024-09-04, 24 months before the notice.
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Where this comes from
Employers covered by the federal WARN Act, and by the stricter laws some states add, must give written notice before a mass layoff or a site closure. The state labor department publishes those notices. Every row here is one of them, taken from that state's own published file and linked to it, so each figure can be checked at the source.
A notice states the employer, the location, the number of employees affected, and when the layoff or closure takes effect. It does not state a reason, and neither does this page. Where a company also appears in SEC filings under the same name and in the same state, its recorded fundraising is shown alongside, as a matter of record rather than as an explanation. New Jersey and Pennsylvania list a notice under the month it was posted or received, not the day, so their notices show a month. Tennessee gives the county rather than the city.
Related
- Crinetics Pharmaceuticals, Inc.: 78 jobs, Nov 2026 layoff notice within 90 days (2026-11-03)
- Peraton: 379 jobs, Oct 2026 layoff notice within 90 days (2026-10-16)
- Kaiser Foundation Hospitals and Kaiser Foundation Health Plan, Inc.: 12 WARN notices, 23 employees, Oct 2026 layoff notice within 90 days (2026-10-19)
- Dreyer's Grand Ice Cream: 3,304 jobs, Oct 2026 layoff notice within 90 days (2026-10-20)
- Cayuga Home for Children, dba Cayuga Centers: 5 WARN notices, 114 employees, Oct 2026 layoff notice within 90 days (2026-10-06)
- Kaiser: 147 jobs, San Diego, CA and more, Sep 2026 layoff notice within 90 days (2026-09-21)
Cite this page
https://mentionfox.com/layoffs/arsenal-biosciences