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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
Flagship Facility Services Inc. at Meta PlatformsSan Mateo, CA3Mar 6, 2023Jan 3, 2023layoffSource ↗
Flagship Facility Services Inc. at Meta PlatformsSan Mateo, CA22Mar 6, 2023Jan 3, 2023layoffSource ↗
Brown & Toland Physician Services OrganizationSan Mateo, CA9Jan 1, 2023Dec 22, 2022layoffSource ↗
Aimmune TherapeuticsSan Mateo, CA75Feb 10, 2023Dec 13, 2022layoffSource ↗
Arana Therapeutics, Inc., a company within Teva Pharmaceuticals USASan Mateo, CA30Feb 3, 2023Dec 2, 2022closureSource ↗
Plenty UnlimitedSan Mateo, CA18Jan 31, 2023Dec 1, 2022closureSource ↗
SynthegoSan Mateo, CA105Nov 18, 2022Nov 15, 2022layoffSource ↗
Thermo Fisher ScientificSan Mateo, CA49Jan 31, 2023Nov 15, 2022layoffSource ↗
IlluminaSan Mateo, CA20Jan 13, 2023Nov 14, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA85Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA34Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA241Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA32Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA139Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA67Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA60Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA46Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA140Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA142Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA94Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA32Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA77Jan 13, 2023Nov 11, 2022layoffSource ↗
Meta PlatformsSan Mateo, CA632Jan 13, 2023Nov 11, 2022layoffSource ↗
RingCentralSan Mateo, CA50Jan 9, 2023Nov 9, 2022layoffSource ↗
NateraSan Mateo, CA58Nov 4, 2022Nov 4, 2022layoffSource ↗

581 notices · Source check Oct 10, 2026

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