WARN Act filings affecting workers in San Mateo, California.
Last updated: Oct 16, 2026 · Showing last 24 months
San Mateo, CA has recorded 10 WARN filings affecting 1,412 workers over the past 24 months. The largest filer is LeeMAH Electronics, with 479 workers affected. Of these, 4 involved facility closures and 6 were layoff events. Filing dates range from Jun 26, 2026 through Sep 14, 2026. LeeMAH Electronics accounts for 34% of affected workers in San Mateo. San Mateo represents 8% of California workers affected by WARN filings in this period.
Federal WARN generally requires 60 days notice for covered events, subject to exceptions. State laws may impose different requirements. Check your own written notice and Department of Labor guidance; public filing dates alone do not establish compliance. Your state workforce agency can help with unemployment benefits and local reemployment services.
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Federal WARN generally requires 60 days notice for covered employers and qualifying events, subject to exceptions. State rules may differ.
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Data on this site comes from WARN Act filings published by state workforce agencies. Where a state does not publish a usable list, filings come from a third-party compilation and are marked on each row. Filings are updated regularly but may not reflect same-day submissions. Coverage varies by state.
| Company | Type | Workers | Effective | Recorded |
|---|---|---|---|---|
| Oracle 500 Oracle Parkway Redwood City CA 94065 |
Layoff | 279 | 2026-11-13 Recorded: 2026-09-14 |
2026-09-14 |
| LeeMAH Electronics 3x in 12 mo 15 South Hill Drive Brisbane CA 94005 |
Closure | 62 | 2026-12-21 Recorded: 2026-09-11 |
2026-09-11 |
| Arsenal Biosciences 329 Oyster Point Blvd South San Francisco CA 94080 |
Layoff | 58 | 2026-10-29 Recorded: 2026-08-31 |
2026-08-31 |
| Cellares 1100 Veterans Boulevard South San Francisco CA 94080 |
Layoff | 100 | 2026-10-20 Recorded: 2026-08-21 |
2026-08-21 |
| LeeMAH Electronics 3x in 12 mo 155 South Hill Drive Brisbane CA 94005 |
Closure | 205 | 2026-10-16 Recorded: 2026-08-17 |
2026-08-17 |
| Flying Food Group 50 Adrian Ct Burlingame CA 94010 |
Closure | 72 | 2026-10-13 Recorded: 2026-08-14 |
2026-08-14 |
| Visa 900 Metro Center Blvd Foster City CA 94404 |
Layoff | 320 | 2026-10-01 Recorded: 2026-07-31 |
2026-07-31 |
| Yerba Mate 225 Harris Court South San Francisco CA 94080 |
Layoff | 1 | 2026-09-01 Recorded: 2026-07-27 |
2026-07-27 |
| LeeMAH Electronics 3x in 12 mo 155 South Hill Drive Brisbane CA 94005 |
Closure | 212 | 2026-09-08 Recorded: 2026-07-07 |
2026-07-07 |
| Genentech 1 DNA Way South San Francisco CA 94080 |
Layoff | 103 | 2026-07-29 Recorded: 2026-06-26 |
2026-06-26 |
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