US WARN layoff notices › Employers › Q › Quest Diagnostics
Official state WARN filings by Quest Diagnostics since 1988, normalized from state labor department sources. Latest notice: 2025-09-29.
Filed under 4 spellings in state records, merged on this page: Quest Diagnostics Inc. (Update to 7/1/15 notice); Quest Diagnostics Inc. (Updated Notice); Quest Diagnostics/Pack Health.
| Notice date | State | Location | Employees | Effective date | Type |
|---|---|---|---|---|---|
| 2025-09-29 | Alabama | Birmingham | 98 | 2025-11-28 | Closure |
| — | Pennsylvania | Norristown, Montgomery | 121 | 2024-08-26 | Closing |
| 2021-05-01 | Pennsylvania | Horsham, Montgomery | 154 | 2021-07-16 | — |
| 2020-08-07 | Maryland | 1901 Sulphur Springs Road Halethorpe, MD 21227 | 52 | 2020-09-27 | 2 |
| 2020-08-05 | California | Woodland, Yolo County | 3 | 2020-04-13 | Layoff Temporary |
| 2020-07-22 | California | Auburn, Placer County | 7 | 2020-04-13 | Layoff Temporary |
| 2018-03-08 | Michigan | Troy | 57 | — | Plant Closing |
| 2015-10-06 | Connecticut | Wallingford | 80 | 2015-08-31 | — |
| 2015-09-04 | Connecticut | Not mentioned | 80 | 2015-08-31 | — |
| 2015-08-19 | Connecticut | Not mentioned | 77 | 2015-08-31 | — |
| 2015-08-13 | California | San Jose | 78 | 2015-10-16 | Layoff Permanent |
| 2015-07-13 | Connecticut | Wallingford | 81 | 2015-08-31 | — |
| 2015-07-01 | Connecticut | Wallingford | 80 | 2015-08-31 | — |
| 2007-04-19 | Illinois | Schaumburg, 506 E. State Parkway | 55 | — | State |
| 2001-01-30 | Michigan | Grand Rapids | 80 | — | Layoff Event |
Source: state WARN Act disclosures, normalized in the free US WARN notices dataset (CSV/JSON, no login, no delay, notices 1988+). WARN notices are advance notifications of plant closings and mass layoffs; actual layoff counts and dates can change after filing.
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