Eisai INC.
Doing business as Eisai
At a glance
EmployeesNot reported
In business since1992
HeadquartersNutley, NJ
US patents715
SAM.gov UEIM3K9M1DWKFR5
CAGE code6MLQ1
Incorporated inDE
LEI54930081TH1JBO3ZVM22
- medicines
- areas
- development
Named on the company’s own website, read JUL 29, 2026
Supplier designations
For Profit OrganizationManufacturer of Goods
Self-certified by the company in its SAM.gov registration
Patents
715 US patents granted 1976–2023, 1 of them in the five years to SEP 2025.
Pharmaceuticals 309Organic fine chemistry 298Measurement 47Biotechnology 27Chemical engineering 11
- Chlorotoxin agents and uses thereofUS 11,826,399 · granted NOV 28, 2023
- Methods for determining prognosis of colorectal cancerUS 10,539,565 · granted JAN 21, 2020
- Monoclonal antibodies that specifically block biological activity of a tumor antigenUS 10,509,037 · granted DEC 17, 2019
- High affinity antibodies that neutralize Staphylococcus enterotoxin BUS 10,364,284 · granted JUL 30, 2019
- Antibodies with immune effector activity and that internalize in folate receptor alpha-positive cellsUS 10,253,106 · granted APR 9, 2019
Newest 5 shown · Granted to Eisai Inc. · PatentsView (USPTO), data through SEP 30, 2025 · CC BY 4.0
Their plants
2 FACILITIES| Facility | City | State | Employees | Status |
|---|---|---|---|---|
| Eisai INC. | Cambridge | MA | — | ACTIVE |
| Eisai INC. | Nutley | NJ | — | ACTIVE |
WARN Act notices
- WARN notice effective MAR 31, 2025 · 57 employees · Eisai INC.
- WARN notice effective APR 30, 2023 · 91 employees · Eisai INC.
Filed with the state under the federal WARN Act · WARN Act notices feed, CC BY 4.0
Compiled from federal records — EPA, OSHA, SAM.gov and the U.S. Census — and from the company’s own website. Federal source data is public domain. Each plant’s page names the source of every field.