Summit Machine, Inc.
2810 East Philadelphia Avenue., Ontario, CA 91761
LIKELY ACTIVELAST SEEN IN FEDERAL DATA DEC 2025 · 3 SOURCES
Operating signal within 24 months, or from a single source.
WARN ACT NOTICES FILED WITH THE STATE
- Layoff notice effective JUL 7, 2020 · 41 employees · filed JUL 29, 2020 · Layoff Permanent — recorded; a layoff does not change the status
- Layoff notice effective JUN 29, 2020 · 123 employees · filed JUL 9, 2020 · 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.
What they make
Machine Shops332710Where it is
34.03369, -117.58956 · CENSUS TIGER
COUNTY
METRO AREA
ON GOOGLE MAPS
Other plants nearby
| Facility | City | Industry | Status | Distance |
|---|---|---|---|---|
| Summit Machining LLC | Ontario | Machine Shops 332710 | LIKELY ACTIVE | 0.2 KM |
| Jcm Engineering CORP | Ontario | Machine Shops 332710 | LIKELY ACTIVE | 0.6 KM |
| Jcm Engineering CORP | Ontario | Machine Shops 332710 | UNVERIFIED | 0.6 KM |
| Mvi Engineering & Manufacturing INC | Ontario | Iron and Steel Mills and Ferroalloy Manufacturing 331110 | UNVERIFIED | 1.0 KM |
| Aerospace Mill Products LLC | Ontario | Machine Shops 332710 | UNVERIFIED | 1.2 KM |
Also at this address
No other federal record shares this street address.
WHERE THIS RECORD COMES FROM — 3 FEDERAL SOURCES, 3 FIELDS
Every fact on this page traces to a public federal filing. The table below names which register holds this facility, whether that register proves the plant operates or only that it exists, and when each of them last saw it.
| Source | Evidence | First seen | Last seen |
|---|---|---|---|
| OSHA ITA | OPERATING | DEC 2025 | DEC 2025 |
| WARN | EXISTENCE | JUL 2020 | JUL 2020 |
| SBA LOANS | EXISTENCE | JUL 2011 | JUL 2011 |
FIELD BY FIELD — WHICH SOURCE SUPPLIED WHAT
| FIELD | SOURCE | SIGNAL |
|---|---|---|
| EMPLOYEE BAND | OSHA ITA | DEC 2025 |
| GEOM | CENSUS GEOCODER | AUG 2026 |
| SBA LOAN | SBA LOANS | JUL 2011 |
Status is computed from independent sources; nothing here is self-reported unless marked Claimed.