AI Visibility Index: Injection Molds & Mold Making in California

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

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

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The headline numbers

Never named by AI

247 of 266

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.

19 named at least once
247 never named

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Cell average: 0.24of 15
Across all 266 tracked companies.
Top ten average: 5.7of 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 Molds & Mold Making companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	M.R. Mold & Engineering Corporation. 33 employeesBrea, California 2 name variants M.R. Mold & Engineeringmost common8 M.R. Mold & Engineering Corp.1	Brea, California	9 of 15 answers
2	Precision Molded Plastics 6 employeesUpland, California 2 name variants Precision Molded Plasticsmost common9 Precision Molded Plastics – Custom Mold Building PDF1	Upland, California	9 of 15 answers
3	Westec Plastics California 2 name variants Westec Plasticsmost common6 Westec Plastics Corporation3	California	9 of 15 answers
4	Newport Plastics LLC 60 employeesBrea, California 2 name variants Newport Plasticsmost common6 Newport Plastics, Inc.1	Brea, California	7 of 15 answers
5	J G Plastics Group LLC 73 employeesCosta Mesa, California	Costa Mesa, California	5 of 15 answers
6	Pro Mold Inc 45 employeesRiverside, California	Riverside, California	5 of 15 answers
7	Universal Plastic Mold UPM, Inc. 150 employeesBaldwin Park, California	Baldwin Park, California	4 of 15 answers
8	Anderson Moulds 25 employeesStockton, California	Stockton, California	3 of 15 answers
9	Distinctive Plastics 40 employeesVista, California 2 name variants Distinctive Plastics (DPI-Tech)most common2 Distinctive Plastics, Inc. (DPI-Tech)1	Vista, California	3 of 15 answers
10	Enstrom Mold and Engineering Inc. 17 employeesSan Marcos, California 2 name variants Enstrom Mold & Engineeringmost common2 Enstrom Mold & Engineering (Enstrom Corporation)1	San Marcos, California	3 of 15 answers

28 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	3 of 15
Carson Tool & Mold	Georgia	2 of 15
Grizzle Industries	Missouri	2 of 15
Liberty Molds	Michigan	1 of 15
Marman Industries	Florida	1 of 15
Piller Aimmco Plastics	Washington	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 molds and mold making in California”
2“Who supplies multi-cavity hardened steel injection molds for high-volume production in California”
3“I need a California mold making partner for a new plastic enclosure program with frequent engineering changes, who should I talk to”
4“Top injection molds and mold making suppliers in California for custom plastic product manufacturers”
5“Which California mold makers can design and build complex hot-runner injection molds with tight-tolerance inserts”
6“List 20 injection molds and mold making 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.

precisionmoldedplastics.com
3 companies
mrmold.com
2 companies
ranchomoldplus.com
2 companies
cdnc.heyzine.com
2 companies
dpi-tech.com
2 companies
enstrommold.com
2 companies
hirelplastics.com
2 companies
igsmolding.com
2 companies
jgplastics.com
2 companies
newportplastics.com
2 companies
techni-mold.com
2 companies
westecplastics.com
2 companies

50 sources were cited across this cell's answers from 43 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 15th of 15 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 13%.

California (this report)Other measured statesCategory average (13%)

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