Twenty/twenty Therapeutics

• Plant closing notice effective JUN 26, 2024 · 76 employees · filed APR 29, 2024 · Closure Permanent — this notice is why the plant is listed as reported closed

Notices filed with the state under the federal WARN Act, as the state publishes them, collected by the WARN Act notices feed (CC BY 4.0). A notice records what the employer told the state; it is not by itself proof that the plant closed.

What they make

Where it is

Other plants nearby

Facility	City	Industry	Status	Distance
Isono Health, INC.	South San Francisco	Electromedical and Electrotherapeutic Apparatus Manufacturing 334510	◐ LIKELY ACTIVE	1.5 KM
Empo Health, INC.	San Bruno	Surgical and Medical Instrument Manufacturing 339112	● ACTIVE	3.2 KM
Cutera INC	Brisbane	Small Arms, Ordnance, and Ordnance Accessories Manufacturing 332994	● ACTIVE	4.6 KM
Neptune Medical INC	Burlingame	Surgical Appliance and Supplies Manufacturing 339113	● ACTIVE	6.4 KM
Garratt-callahan Company	Burlingame	All Other Miscellaneous Chemical Product and Preparation Manufacturing 325998	● ACTIVE	6.6 KM

Every listed plant in San Mateo County

Also at this address

No other federal record shares this street address.

Where this record comes from

2 sources hold this plant, and 7 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.

EPA cross-references this facility in RCRAINFO · EPA site type STATIONARY.

• State WARN plant-closing and layoff noticesCLOSURE
  first seen JUN 2024 · last seen JUN 2024
• EPA Facility Registry ServiceEXISTENCE
  Record 110071051041 · first seen JUL 2021 · last seen JUL 2021

IN SAN MATEO COUNTY98 other plants share this one’s industry (Medical Equipment and Supplies Manufacturing, NAICS 3391); 11 of them have a size band on record.

What each source says

Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

Name

EPA: TWENTY/TWENTY THERAPEUTICS · OCT 2026

Street address

EPA: 259 E GRAND AVE · OCT 2026

City

EPA: SOUTH SAN FRANCISCO · OCT 2026

State

EPA: CA · OCT 2026

County (FIPS code)

EPA: 06081 · OCT 2026

Coordinates

EPA: 37.653449,-122.395269 · OCT 2026

Hazardous waste generator (RCRA)

EPA ECHO: none · OCT 2026