Tower Semiconductor

4321 Jamboree Rd., Newport Beach, CA 92660

LIKELY ACTIVELAST SEEN IN FEDERAL DATA DEC 2025 · 6 SOURCES

Operating signal within 24 months, or from a single source.

WARN ACT NOTICE FILED WITH THE STATE

Layoff notice effective APR 1, 2024 · 699 employees · filed JAN 30, 2024 · Layoff Temporary — recorded; a layoff does not change the status

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.

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What they make

Semiconductor and Related Device Manufacturing334413

Where it is

33.66196, -117.85845 · CENSUS TIGER

COUNTY

Orange County

METRO AREA

Los Angeles-Long Beach-Anaheim, CA

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Other plants nearby

Facility	City	Industry	Status	Distance
Conexant Systems INC	Newport Beach	Semiconductor and Related Device Manufacturing 334413	UNVERIFIED	0.2 KM
Sanmina Corporation	Irvine	Bare Printed Circuit Board Manufacturing 334412	UNVERIFIED	1.5 KM
Adme INC	Newport Beach	Printed Circuit Assembly (Electronic Assembly) Manufacturing 334418	ACTIVE	1.3 KM
Rockwell International Collins	Costa Mesa	Other Electronic Component Manufacturing 334419	REPORTED CLOSED	1.5 KM
Summit Interconnect, INC.	Irvine	Bare Printed Circuit Board Manufacturing 334412	REPORTED CLOSED	2.0 KM

Every listed plant in Orange County

Also at this address

3 other records share this street address. Separate filings can describe distinct businesses on one site, or the same plant recorded by different agencies, so every record is kept rather than merged away.

Skyworks Solutions INC

Newport Beach, CA

UNVERIFIED334413

Where this record comes from

6 sources hold this plant, and 9 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 BR, CA-ENVIROVIEW, HWTS-DATAMART, ICIS, NPDES, RCRAINFO, TRIS · EPA site type STATIONARY.

OSHA injury and illness reportsOPERATING
Record 1537800 · first seen DEC 2025 · last seen DEC 2025
EPA ECHO compliance recordsOPERATING
first seen AUG 2025 · last seen AUG 2025
EPA Toxics Release InventoryOPERATING
first seen DEC 2023 · last seen DEC 2024
DOL Form 5500 retirement plan filingsOPERATING
Record 753005127|CA|92660|4321 jamboree rd m s h01 110 · first seen DEC 2024 · last seen DEC 2024
State WARN plant-closing and layoff noticesEXISTENCE
first seen APR 2024 · last seen APR 2024
EPA Facility Registry ServiceEXISTENCE
Record 110015679372 · first seen DEC 2014 · last seen JUN 2017

ALSO RECORDED ASJAZZ SEMICONDUCTOR

IN ORANGE COUNTY303 other plants share this one’s industry (Semiconductor and Other Electronic Component Manufacturing, NAICS 3344); 75 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: TOWER SEMICONDUCTOR · OCT 2026
Street address: EPA: 4321 JAMBOREE RD. · OCT 2026
City: EPA: NEWPORT BEACH · OCT 2026
State: EPA: CA · OCT 2026
County (FIPS code): EPA: 06059 · OCT 2026
Coordinates: EPA: 33.66196,-117.85845 · OCT 2026
Employees (band): OSHA: 500+ · DEC 2025
Retirement plan filing (Form 5500): DOL: 1,103 active participants, plan year ending 2024-12-31, 2 plan(s) · DEC 2024
Hazardous waste generator (RCRA): EPA ECHO: LQG · OCT 2026

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