EntityWire/California business entity search →/DAY ONE BIOPHARMACEUTICALS, INC.
Employer with a benefit plan
DAY ONE BIOPHARMACEUTICALS, INC.
The Employer Identification Number (EIN) for DAY ONE BIOPHARMACEUTICALS, INC. is 83-2415215.
At a glance
- EIN
- 83-2415215 · 832415215
- Legal name
- DAY ONE BIOPHARMACEUTICALS, INC.
- Also filed as
- Day One Biopharmaceuticals Holding Co LLC
- Address on file
- 1800 SIERRA POINT PARKWAY,, BRISBANE, CA 94005
- Records show
- SEC filer; employer with a benefit plan; state registration
- Latest record
- 2026-09-08
State registration
Florida Division of Corporations (Sunbiz) bulk data · records as of 2026-09-08
- Florida registration
- Active · Foreign profit corporation
- Source: Florida registry · as of 2026-09-08
- Florida document number
- F26000005388
- Source: Florida registry · as of 2026-09-08
- Registered in Florida
- 2026-09-04
- Source: Florida registry · as of 2026-09-08
- Registered agent
- C T CORPORATION SYSTEM
- Source: Florida registry · as of 2026-09-08
SEC records
SEC EDGAR company filings · records as of 2026-05-15
- SEC CIK
- 0001845337
- Source: SEC · as of 2026-05-15
- Industry (SIC)
- Pharmaceutical Preparations (2834)
- Source: SEC · as of 2026-05-15
- State of incorporation
- DE
- Source: SEC · as of 2026-05-15
- Latest SEC filing
- SCHEDULE 13G/A 2026-05-15
- Source: SEC · as of 2026-05-15
Benefit plans
DOL Form 5500 filings (EFAST2) · records as of 2025-10-03
- Benefit plan 1, 2024 filing
- DAY ONE BIOPHARMACEUTICALS 401(K) PLAN
- Source: DOL 5500 · as of 2025-10-03
- Participants (start of year)
- 168
- Source: DOL 5500 · as of 2025-10-03
- Plan features
- ERISA 404(c) plan; Participant-directed; 401(k) feature; Profit-sharing; 401(m) matching; Pre-approved plan
- Source: DOL 5500 · as of 2025-10-03
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-10-03
- Business code (NAICS)
- 541700
- Source: DOL 5500 · as of 2025-10-03
- Benefit plan 501, 2024 filing
- DAY ONE BIOPHARMACEUTICALS EMPLOYEE HEALTH AND WELFARE BENEFITS PLAN
- Source: DOL 5500 · as of 2025-07-23
What this record is
Public filings that carry this EIN (DOL Form 5500 filings (EFAST2), Florida Division of Corporations (Sunbiz) bulk data and SEC EDGAR company filings), shown as filed. Nothing is scraped from the IRS, and a public-record match is not IRS TIN validation.
What it is not
Registry status, formation date, and registered agent come from the California Secretary of State, Business Programs Division (Business Entities); see the California business entity search.
If something is wrong
A name, address, or classification here is what the source published. To correct the source, file with it; to have this page removed, see corrections and removal.
Other California businesses on file
- KURA ONCOLOGY, INC.EIN 61-1547851
- IRIDEX CORPORATIONEIN 77-0210467
- DERMIRA, INC.EIN 27-3267680
- VAXART, INC.EIN 59-1212264
- SEMLER SCIENTIFIC, INC.EIN 26-1367393
- AIR LEASE CORPORATIONEIN 27-1840403
Look up another business
Free search. No account required.