US WARN intelligence
San Mateo County, California WARN notices
San Mateo County, California has 581 non-cancelled imported WARN notices reporting 46,943 workers affected. 6 notices have future effective dates. These totals cover imported records only.
What the official notice history shows
During the last 365 days, this imported archive contains 47 eligible official filings for San Mateo County, California, reporting 6,121 affected workers. 0 worker counts are unavailable. The newest official notice date is Sep 14, 2026.
580 non-cancelled direct government records and 1 attributed secondary records appear in the full archive. Recent official event types: layoff, closure. These figures describe notices, not unique people or completed layoffs. Grouped company names do not establish ownership.
Compare original weekly and monthly official-data reports → · How dates, names and counts are interpreted
Notice history by year
Filings and attributed reports
| Company / location | Workers | Effective date | Notice date | Type / source |
|---|---|---|---|---|
| VisaSan Mateo, CA | 192 | Jan 21, 2025 | Nov 21, 2024 | layoffSource ↗ |
| 23andMeSan Mateo, CA | 31 | Jan 10, 2025 | Nov 19, 2024 | closureSource ↗ |
| Advance Stores Company, Incorporated and its subsidiary, Golden State SupplySuite B San Carlos, CA | 8 | Mar 9, 2025 | Nov 14, 2024 | closureSource ↗ |
| Gilead SciencesSan Mateo, CA | 104 | Mar 14, 2025 | Nov 13, 2024 | layoffSource ↗ |
| EquinixSan Mateo, CA | 87 | Dec 6, 2024 | Nov 8, 2024 | layoffSource ↗ |
| VisaSan Mateo, CA | 26 | Jan 3, 2025 | Nov 1, 2024 | layoffSource ↗ |
| GoProSan Mateo, CA | 73 | Nov 8, 2024 | Oct 29, 2024 | layoffSource ↗ |
| Astellas Gene TherapiesSan Mateo, CA | 10 | Jan 1, 2025 | Oct 23, 2024 | layoffSource ↗ |
| StachsSan Mateo, CA | 43 | Dec 31, 2024 | Oct 16, 2024 | layoffSource ↗ |
| Kaiser Foundation HospitalsSan Mateo, CA | 1 | Nov 22, 2024 | Sep 23, 2024 | layoffSource ↗ |
| Astellas Gene TherapiesSan Mateo, CA | 7 | Oct 21, 2024 | Aug 27, 2024 | layoffSource ↗ |
| GenentechSan Mateo, CA | 93 | Oct 8, 2024 | Aug 22, 2024 | layoffSource ↗ |
| GRAILSan Mateo, CA | 179 | Oct 14, 2024 | Aug 13, 2024 | layoffSource ↗ |
| Konica Minolta Business Solutions U.S.A.Suite 510 Foster City, CA | 20 | Sep 30, 2024 | Jul 29, 2024 | closureSource ↗ |
| ExabeamSan Mateo, CA | 43 | Sep 16, 2024 | Jul 16, 2024 | layoffSource ↗ |
| Astellas Gene TherapiesSan Mateo, CA | 10 | Jun 19, 2024 | Jun 19, 2024 | layoffSource ↗ |
| Thought StreamSan Mateo, CA | 35 | Jun 12, 2024 | Jun 12, 2024 | closureSource ↗ |
| La Petite BaleenSan Mateo, CA | 77 | Aug 5, 2024 | Jun 3, 2024 | temporarySource ↗ |
| Phoenix Labs USA Operations, Inc. aka Phoenix Labs (Foster City)San Mateo, CA | 162 | May 22, 2024 | May 22, 2024 | layoffSource ↗ |
| WalmartSan Mateo, CA | 11 | Aug 9, 2024 | May 17, 2024 | layoffSource ↗ |
| WalmartSan Mateo, CA | 250 | Aug 9, 2024 | May 17, 2024 | layoffSource ↗ |
| Bolt BiotherapeuticsSan Mateo, CA | 38 | Jul 15, 2024 | May 14, 2024 | layoffSource ↗ |
| BioMarin PharmaceuticalSan Mateo, CA | 3 | Jul 13, 2024 | May 14, 2024 | layoffSource ↗ |
| IndeedSan Mateo, CA | 87 | Jul 12, 2024 | May 13, 2024 | layoffSource ↗ |
| Pacific Biosciences of CaliforniaSan Mateo, CA | 71 | Jun 28, 2024 | Apr 29, 2024 | layoffSource ↗ |