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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
Oracle AmericaRedwood City, CA279Nov 13, 2026Sep 14, 2026layoffSource ↗
LeeMah ElectronicsBrisbane, CA62Dec 21, 2026Sep 11, 2026closureSource ↗
Arsenal BiosciencesSouth San Francisco, CA58Oct 29, 2026Aug 31, 2026layoffSource ↗
CellaresSouth San Francisco, CA100Oct 20, 2026Aug 21, 2026layoffSource ↗
LeeMAH ElectronicsBrisbane, CA205Oct 16, 2026Aug 17, 2026closureSource ↗
Flying Food GroupBurlingame, CA72Oct 13, 2026Aug 14, 2026closureSource ↗
VisaFoster City, CA320Oct 1, 2026Jul 31, 2026layoffSource ↗
Yerba Mate Co., LLC - South San FranciscoSouth San Francisco, CA1Sep 1, 2026Jul 27, 2026layoffSource ↗
LeeMAH ElectronicsBrisbane, CA212Sep 8, 2026Jul 7, 2026closureSource ↗
Flagship Facilities ServicesSan Mateo, CA5Jul 19, 2026Jun 26, 2026layoffSource ↗
GenentechSouth San Francisco, CA103Jul 29, 2026Jun 26, 2026layoffSource ↗
Sangamo TherapeuticsSan Mateo, CA4Jun 22, 2026Jun 22, 2026layoffSource ↗
Vine Hospitality (Left Bank Menlo Park Partners, LP)San Mateo, CA42Jun 23, 2026Jun 21, 2026closureSource ↗
WalmartSan Mateo, CA88Aug 21, 2026Jun 19, 2026layoffSource ↗
Robinhood MarketsSan Mateo, CA63Sep 1, 2026Jun 16, 2026layoffSource ↗
Verily HealthSan Mateo, CA58Aug 7, 2026Jun 8, 2026layoffSource ↗
Acumen LLC & The SPHERESuite 100 Burlingame, CA58Jul 26, 2026May 28, 2026layoffSource ↗
Meta PlatformsSan Mateo, CA2,212Jul 22, 2026May 22, 2026layoffSource ↗
Meta PlatformsSan Mateo, CA338Jul 22, 2026May 22, 2026layoffSource ↗
Gilead SciencesSan Mateo, CA108Jun 30, 2026Apr 30, 2026layoffSource ↗
The Primary SchoolSan Mateo, CA100Jun 30, 2026Apr 28, 2026closureSource ↗
The Primary School (1765 East Bayshore Rd. Ste. 111)San Mateo, CA22Jun 30, 2026Apr 28, 2026closureSource ↗
Oracle AmericaSan Mateo, CA310Jun 1, 2026Apr 1, 2026layoffSource ↗
Meta PlatformsSan Mateo, CA124May 22, 2026Mar 30, 2026layoffSource ↗
Gilead SciencesSan Mateo, CA51May 29, 2026Mar 25, 2026layoffSource ↗

581 notices · Source check Oct 8, 2026