AI Visibility Index: Injection Molded Plastics in California

When a buyer asks an AI assistant for a injection molded plastics supplier in California, these are the companies that get named. This is what we found when the cell was last measured.

845 companies tracked
Last measured September 30, 2026
Next measurement October 30, 2026

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The headline numbers

Never named by AI

820 of 845

companies never appeared in a single buying question

They were asked the same 5 buying questions as everyone else in this cell and were not named once.

25 named at least once
820 never named

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Cell average: 0.09of 15
Across all 845 tracked companies.
Top ten average: 5.9of 15
The ten most visible companies in the cell.

A company's score is how many of the 15 measured answers named it.

The top ten in California

These are the companies AI assistants named most often when California buyers went looking for a supplier in this category.

Top 10 most AI-visible Injection Molded Plastics companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Precision Molded Plastics 6 employeesUpland, California	Upland, California	13 of 15 answers
2	Ambrit Engineering Corporation 65 employeesSanta Ana, California 2 name variants Ambrit Engineering Corp.most common5 Ambrit Engineering3	Santa Ana, California	8 of 15 answers
3	J G Plastics Group LLC 73 employeesCosta Mesa, California	Costa Mesa, California	6 of 15 answers
4	Hi-Rel Plastics & Molding 32 employeesRiverside, California 2 name variants Hi‑Rel Plastics & Moldingmost common3 Hi‑Rel Plastics & Molding, Inc.2	Riverside, California	5 of 15 answers
5	Valencia Plastics 6 employeesValencia, California 2 name variants Valencia Plastics Inc.most common3 Valencia Plastics2	Valencia, California	5 of 15 answers
6	Cord Industries California	California	5 of 15 answers
7	Norco Plastics California	California	5 of 15 answers
8	Performance Engineered Products Inc. 70 employeesPomona, California	Pomona, California	4 of 15 answers
9	RenyMed 18 employeesBaldwin Park, California	Baldwin Park, California	4 of 15 answers
10	Universal Plastic Mold UPM, Inc. 150 employeesBaldwin Park, California	Baldwin Park, California	4 of 15 answers

44 more companies were named at least once. Companies outside the top ten are counted in the averages but not named here.

Also named, based in another state

AI assistants named these companies too, but MacRAE'S lists them in a different state, not California. They belong to that state's ranking, not this one.

Company	State	Mentions
Advance Plastics	Illinois	1 of 15
Grizzle Industries	Missouri	1 of 15

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The five questions we asked

Every company in this cell is measured on the same questions, written the way a buyer would type them. That is what makes the ranking a comparison rather than a collection of anecdotes.

1“Best suppliers of injection molded plastics in California”
2“Who supplies custom injection molded ABS housings in California”
3“I need a California injection molded plastics partner for a 100,000 unit consumer electronics enclosure run, who should I talk to”
4“Top injection molded plastics suppliers in California for consumer product OEM buyers”
5“Which California injection molders can handle overmolding on metal inserts for structural components”
6“List 20 injection molded plastics companies in California with their specialties.”the roster question

Each question is asked more than once, which is why a company's score is out of 15 answers rather than out of the number of questions.

Where AI drew its answers from

These are the sources the answers in this cell leaned on most, ranked by how many of the named companies each one stands behind.

ambritengineering.com
2 companies
controlplastics.com
2 companies
centplasticmfg.com
2 companies
hirelplastics.com
2 companies
jatco.com
2 companies
ksplastic.com
2 companies
norcoplastics.com
2 companies
pexco.com
2 companies
uniboxinfo.com
2 companies
valenciaplastics.com
2 companies
precisionmoldedplastics.com
1 company
jgplastics.com
1 company

62 sources were cited across this cell's answers from 51 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

California in context

California ranks 30th of 33 measured states in this category. Each bar is the share of that state's tracked companies that AI assistants named at least once; across every measured state in this category the share is 6%.

California (this report)Other measured statesCategory average (6%)

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