Layoffs in San Mateo County, California
8 employers in San Mateo County have filed 10 WARN notices since July 2026, covering 1,412 workers. Largest by workers: LeeMAH Electronics (479); Visa (320); Oracle America (279). They were processed by the EDD on 10 different dates, most recently Sep 15, 2026. The latest notice (279 workers, from Oracle America) takes effect on Nov 13, 2026.
About this data: figures are collected automatically from California Employment Development Department and checked before publication. They are for general information only and are not advice. Confirm with the source before acting. Last verified Oct 1, 2026, 3:00 PM ET. Report an error →
Employer names and worker counts are as reported in WARN notices filed with the California Employment Development Department and may be amended by the filer. Employers who believe a listing is inaccurate can email editor@moneytrackerdaily.com with the filing reference.
All California WARN notices · Methodology · Download CSV · Cite this
Summary
All 10 notices
| Processed | Employer (as filed) | County | Site | Workers | Type | Industry | Effective | Source |
|---|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | Oracle America, Inc. | San Mateo | 500 Oracle Parkway Redwood City CA 94065 | 279 | Layoff, permanent | Manufacturing | Nov 13, 2026 | Listing |
| Sep 14, 2026 | LeeMah Electronics | San Mateo | 15 South Hill Drive Brisbane CA 94005 | 62 | Closure, permanent | Manufacturing | Dec 21, 2026 | Listing |
| Sep 1, 2026 | Arsenal Biosciences, Inc. | San Mateo | 329 Oyster Point Blvd South San Francisco CA 94080 | 58 | Layoff, permanent | Professional Scientific and Technical Services | Oct 29, 2026 | Listing |
| Aug 21, 2026 | Cellares Corporation | San Mateo | 1100 Veterans Boulevard South San Francisco CA 94080 | 100 | Layoff, permanent | Professional Scientific and Technical Services | Oct 20, 2026 | Listing |
| Aug 20, 2026 | Flying Food Group, LLC | San Mateo | 50 Adrian Ct Burlingame CA 94010 | 72 | Closure, permanent | Accommodation and Food Services | Oct 13, 2026 | Listing |
| Aug 17, 2026 | LeeMAH Electronics | San Mateo | 155 South Hill Drive Brisbane CA 94005 | 205 | Closure, permanent | Manufacturing | Oct 16, 2026 | Listing |
| Jul 31, 2026 | Visa | San Mateo | 900 Metro Center Blvd Foster City CA 94404 | 320 | Layoff, permanent | Finance and Insurance | Oct 1, 2026 | Listing |
| Jul 28, 2026 | Yerba Mate Co., LLC - South San Francisco | San Mateo | 225 Harris Court South San Francisco CA 94080 | 1 | Layoff, permanent | Wholesale Trade | Sep 1, 2026 | Listing |
| Jul 8, 2026 | LeeMAH Electronics | San Mateo | 155 South Hill Drive Brisbane CA 94005 | 212 | Closure, permanent | Manufacturing | Sep 8, 2026 | Listing |
| Jul 1, 2026 | Genentech, Inc. | San Mateo | 1 DNA Way South San Francisco CA 94080 | 103 | Layoff, permanent | Professional Scientific and Technical Services | Jul 29, 2026 | Listing |
By employer
| Employer | Notices | Workers |
|---|---|---|
| LeeMAH Electronics | 3 | 479 |
| Visa | 1 | 320 |
| Oracle America | 1 | 279 |
| Genentech | 1 | 103 |
| Cellares | 1 | 100 |
| Flying Food Group | 1 | 72 |
| Arsenal Biosciences | 1 | 58 |
| Yerba Mate Co. | 1 | 1 |
By industry
| Industry | Notices | Workers |
|---|---|---|
| Manufacturing | 4 | 758 |
| Finance and Insurance | 1 | 320 |
| Professional Scientific and Technical Services | 3 | 261 |
| Accommodation and Food Services | 1 | 72 |
| Wholesale Trade | 1 | 1 |
Methodology
- What is included
- Every California WARN notice we have stored for this county, from all years collected, not only the current one. Totals are calculated by us from the notices.
- Last updated
- Oct 1, 2026, 3:00 PM ET
- Download
- CSV of the notices on this page
- Cite this
Money Tracker Daily, "Layoffs in San Mateo County, California", updated October 1, 2026, https://moneytrackerdaily.com/trackers/layoffs/california/county/san-mateo. Data: California Employment Development Department, WARN Report.
Spotted an error? See our corrections policy or email editor@moneytrackerdaily.com.