WARN Act filings affecting workers in San Mateo, California.
Last updated: Mar 09, 2026 · Showing last 24 months
San Mateo, CA has recorded 39 WARN filings affecting 2,134 workers over the past 24 months. The largest filer is Meta, with 577 workers affected. Of these, 4 involved facility closures and 35 were layoff events. Filing dates range from Jan 29, 2025 through Feb 23, 2026.
If your employer filed a WARN notice affecting workers in San Mateo, you are entitled to 60 days advance written notice before your last day. During the notice period, you remain employed with regular pay and benefits. If your employer gave less than 60 days notice, you may be entitled to back pay and benefits for each day of the shortfall. After your last day, file for unemployment insurance with your state workforce agency as soon as possible. Review your COBRA options to continue health coverage for up to 18 months. Visit your local America's Job Center for free career counseling, resume help, and retraining vouchers.
Apply online at your state workforce agency. You may be eligible before your last day.
Losing employer-sponsored coverage qualifies you for a Special Enrollment Period on the Health Insurance Marketplace.
You may be able to temporarily continue your employer health plan for up to 18 months, though you'll pay the full premium.
Employers with 100 or more employees must give 60 days written notice before mass layoffs or plant closings.
Free career counseling, resume help, job search assistance, and retraining programs through CareerOneStop.
All data on this site is sourced from official WARN Act filings published by state workforce agencies. Filings are updated regularly but may not reflect same-day submissions. Coverage varies by state.
| Company | Type | Workers | Effective | Filed |
|---|---|---|---|---|
| C3.ai 1400 Seaport Boulevard Redwood City CA 94063 |
Layoff | 71 | 2026-04-26 | 2026-02-23 |
| Meta 11x in 12 mo 305 Constitution Dr. Menlo Park CA 94025 |
Layoff | 39 | 2026-03-20 | 2026-02-02 |
| Meta 11x in 12 mo 1 Hacker Way Menlo Park CA 94025 |
Layoff | 6 | 2026-03-20 | 2026-02-02 |
| Meta 11x in 12 mo 180 Jefferson Drive Menlo Park CA 94025 |
Layoff | 2 | 2026-03-20 | 2026-02-02 |
| Meta 11x in 12 mo 190 Jefferson Drive Menlo Park CA 94025 |
Layoff | 1 | 2026-03-20 | 2026-02-02 |
| Meta 11x in 12 mo 220 Jefferson Drive Menlo Park CA 94025 |
Layoff | 2 | 2026-03-20 | 2026-02-02 |
| Chan Zuckerberg Initiative 1180 Main St. Redwood CA 94063 |
Layoff | 38 | 2026-03-30 | 2026-01-29 |
| Chan Zuckerberg Initiative 1180 Main St. Redwood City CA 94063 |
Layoff | 32 | 2026-03-30 | 2026-01-29 |
| Resonetics 405 Campbell Ave. Menlo Park CA 94025 |
Closure | 61 | 2026-04-21 | 2026-01-20 |
| Meta 11x in 12 mo 311 Airport Boulevard Burlingame CA 94010 |
Layoff | 219 | 2026-03-20 | 2026-01-16 |
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