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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

581Non-cancelled notices
46,943Reported workers
6Future effective dates
Coverage is limited to connected sources and imported date ranges. 0 notices have unavailable worker counts. Company groups match normalized names; aliases below preserve exact employer names from filings. Methodology →

Notice history by year

202638 notices · 5,521 reported workers
202562 notices · 3,309 reported workers
202448 notices · 3,865 reported workers
2023129 notices · 5,388 reported workers
202244 notices · 4,115 reported workers
202142 notices · 2,917 reported workers
2020170 notices · 18,271 reported workers
201923 notices · 1,595 reported workers
201817 notices · 1,372 reported workers
20177 notices · 515 reported workers
20161 notices · 75 reported workers
Oracle America →California →Redwood City →LeeMAH Electronics →Brisbane →Arsenal Biosciences →South San Francisco →Cellares →FLYING FOOD GROUP →Burlingame →Visa →Foster City →Yerba Mate Co., LLC - South San Francisco →Flagship Facilities Services →Genentech →

Filings and attributed reports

Company / locationWorkersEffective dateNotice dateType / source
Sutro BiopharmaSan Mateo, CA1Sep 30, 2025Sep 29, 2025layoffSource ↗
Sutro BiopharmaSan Mateo, CA8Sep 30, 2025Sep 29, 2025layoffSource ↗
Canyon Ranch WoodsideSan Mateo, CA56Nov 21, 2025Sep 24, 2025closureSource ↗
Arsenal BiosciencesSan Mateo, CA100Nov 14, 2025Sep 16, 2025layoffSource ↗
CarbonSan Mateo, CA78Nov 17, 2025Sep 15, 2025layoffSource ↗
San Bruno CityNet ServicesSan Mateo, CA13Nov 15, 2025Sep 15, 2025closureSource ↗
Agile Physical Therapy (Sutter Health San Carlos Physical Therapy & Hand Therapy)San Mateo, CA19Nov 14, 2025Sep 12, 2025layoffSource ↗
Oracle AmericaSan Mateo, CA187Nov 3, 2025Sep 2, 2025layoffSource ↗
Oracle AmericaSan Mateo, CA143Oct 13, 2025Aug 13, 2025layoffSource ↗
Planned Parenthood Mar MonteSan Mateo, CA9Jul 24, 2025Jul 24, 2025layoffSource ↗
Planned Parenthood Mar Monte, Inc. - 29San Mateo, CA1Jul 24, 2025Jul 24, 2025layoffSource ↗
Planned Parenthood Mar MonteSan Mateo, CA10Sep 24, 2025Jul 24, 2025layoffSource ↗
GenentechSan Mateo, CA87Sep 15, 2025Jul 16, 2025layoffSource ↗
Cruise, LLC - 1201 BryantSan Mateo, CA85Jul 3, 2025Jul 3, 2025layoffSource ↗
genentechSan Mateo, CA141Aug 18, 2025Jun 26, 2025layoffSource ↗
Prothena BiosciencesSan Mateo, CA91Aug 1, 2025Jun 2, 2025layoffSource ↗
GenentechSan Mateo, CA143Jul 14, 2025May 29, 2025layoffSource ↗
WalmartSan Mateo, CA106Aug 22, 2025May 23, 2025layoffSource ↗
Eikon TherapeuticsSan Mateo, CA55Jul 21, 2025May 21, 2025layoffSource ↗
PMAB-5San Mateo, CA63Jul 18, 2025May 16, 2025layoffSource ↗
InsitroSan Mateo, CA63Mar 9, 2025May 8, 2025layoffSource ↗
Pliant TherapeuticsSan Mateo, CA69May 1, 2025May 1, 2025layoffSource ↗
257 Unitek Learning Education GroupSan Mateo, CA1Jul 3, 2025Apr 30, 2025layoffSource ↗
NGM BiopharmaceuticalsSan Mateo, CA85Jun 30, 2025Apr 29, 2025layoffSource ↗
Pacific Biosciences of CaliforniaSan Mateo, CA70Jun 8, 2025Apr 9, 2025layoffSource ↗

581 notices · Source check Oct 9, 2026

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