Atara Biotherapeutics layoff notices at a glance
Atara Biotherapeutics has filed 9 WARN notices with the California Employment Development Department between Jan 26, 2022 and Mar 18, 2025, naming 365 workers. All were layoffs rather than closures; 9 permanent, 0 temporary. The largest single notice named 140 workers in Ventura County on Jan 26, 2022. Its latest notice, 31 workers in Ventura County dated Mar 18, 2025, was 1.7% of the 1,837 workers named in all 24 Ventura County notices of fiscal year 2024-2025. 2 of the notices show fewer than 60 days between the notice date and the effective date (see how to read this).
Every notice, newest first
| Notice date | Effective | County | City | Workers | Type | Days notice |
|---|---|---|---|---|---|---|
| Mar 18, 2025 | May 2, 2025 | Ventura | Newbury Park | 31 | Layoff, permanent | 45 under 60 |
| Jan 8, 2024 | Mar 8, 2024 | Ventura | Thousand Oaks | 43 | Layoff, permanent | 60 |
| Jan 8, 2024 | Mar 8, 2024 | Ventura | Thousand Oaks | 1 | Layoff, permanent | 60 |
| Nov 1, 2023 | Dec 31, 2023 | Ventura | Thousand Oaks | 72 | Layoff, permanent | 60 |
| Nov 1, 2023 | Dec 31, 2023 | Ventura | Thousand Oaks | 1 | Layoff, permanent | 60 |
| Aug 8, 2022 | Oct 7, 2022 | Ventura | Thousand Oaks | 55 | Layoff, permanent | 60 |
| Aug 8, 2022 | Oct 7, 2022 | San Mateo | South San Francisco | 14 | Layoff, permanent | 60 |
| Aug 8, 2022 | Oct 7, 2022 | Ventura | Thousand Oaks | 8 | Layoff, permanent | 60 |
| Jan 26, 2022 | Jan 26, 2022 | Ventura | Thousand Oaks | 140 | Layoff, permanent | 0 under 60 |
Sites named on the notices
- 1280 Rancho Conejo Blvd. Newbury Park CA 91320 (Mar 18, 2025, 31 workers)
- 1280 Rancho Conejo Blvd Thousand Oaks CA 91320 (Jan 8, 2024, 43 workers)
- 2380 Conejo Spectrum Street #200 Thousand Oaks CA 91320 (Jan 8, 2024, 1 workers)
- 1280 Rancho Conejo Blvd. Thousand Oaks CA 91320 (Nov 1, 2023, 1 workers)
- 2380 Conejo Spectrum St, Suite 200 Thousand Oaks CA (Aug 8, 2022, 55 workers)
- 611 Gateway Blvd #900 South San Francisco CA 94080 (Aug 8, 2022, 14 workers)
- 2430 Conejo Spectrum St. Thousand Oaks (Jan 26, 2022, 140 workers)
Also filed as: Atara Biotherapeutics, Inc.
Where the notices landed
- Ventura County8 notices, 351 workers
- San Mateo County1 notice, 14 workers
- Thousand Oaks7 notices, 320 workers
- Newbury Park1 notice, 31 workers
- South San Francisco1 notice, 14 workers
Local pages: Thousand Oaks employment lawyer, Ventura County employment law guide, San Mateo County employment law guide.
How to read this record
Notice date is the date on the employer's letter. Effective is the first day of separations it announced. Days notice is the gap between them; California Labor Code 1401 calls for 60 days from a covered employer, and section 1402 makes a short notice worth a day of pay and benefits for every day it is short, up to 60.
For Atara Biotherapeutics the shortest gap shown is 0 days. That is a reason to check whether an exception in 1401(c) or 1402.5 applied, whether the workers received the letter earlier than the EDD did, and whether anyone was let go before the effective date. It is not, by itself, a finding against the employer.
Full statute walk-through: the California 60-day rule, section by section.
If you work, or worked, at Atara Biotherapeutics
Keep the notice, every email about the selection, and your final pay stub. A free review covers four things in one call: whether the notice period was honored and paid, whether final pay and vacation payout arrived on time, whether the selection pattern raises an age, pregnancy or leave, or retaliation question, and what a proposed severance release is actually worth before you sign it. Call (800) 371-3088 or send the notice.
Source: California EDD WARN reports, fiscal years 2021-2022 to 2024-2025. Record last checked against the EDD on Oct 30, 2026. Back to the layoff tracker.
About this data: Notices come from the California Employment Development Department WARN reports (fiscal years 2014-2015 to today) and are reloaded from the EDD every Tuesday and Thursday. Employer names appear as the employer wrote them on the notice, grouped where the names clearly refer to the same company. A notice is not a finding that any law was broken. This page is general information, not legal advice about your situation.