AI Visibility Index: Electronic Contract Manufacturing & PCB Assembly in California

When a buyer asks an AI assistant for a electronic contract manufacturing & pcb assembly supplier in California, these are the companies that get named. This is what we found when the cell was last measured.

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

Look up your company Get your monthly report

The headline numbers

Never named by AI

129 of 157

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.

28 named at least once
129 never named

Not sure whether you are one of them?Check your domain

Cell average: 0.34of 15
Across all 157 tracked companies.
Top ten average: 5.1of 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 Electronic Contract Manufacturing & PCB Assembly companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Yun Industrial Co Ltd 30 employeesCarson, California 2 name variants ACME PCB Assemblymost common6 ACME PCB Assembly (Yun Industrial)1	Carson, California	7 of 15 answers
2	Calpak USA California	California	7 of 15 answers
3	EXPERT‑EMS California 2 name variants EXPERT‑EMSmost common6 EXPERT-EMS (Expert Assembly)1	California	7 of 15 answers
4	PARPRO Technologies California	California	7 of 15 answers
5	ABX Engineering, Inc. 72 employeesBurlingame, California	Burlingame, California	5 of 15 answers
6	Spectrum Assembly Inc 15 employeesCarlsbad, California 2 name variants Spectrum Assembly, Inc.most common3 Spectrum Assembly, Inc. (SAI)1	Carlsbad, California	4 of 15 answers
7	Streamline Electronics Manufacturing, Inc. (SEM) 25 employeesFremont, California	Fremont, California	4 of 15 answers
8	Meritek EMS California	California	4 of 15 answers
9	Golden West Technology 60 employeesFullerton, California	Fullerton, California	3 of 15 answers
10	Goodtron Electronics California	California	3 of 15 answers

49 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
Sanmina	Ontario	7 of 15
CTD‑USA	Colorado	4 of 15
Kelytech	Michigan	3 of 15
Sunnytech	New Jersey	3 of 15
EMS Technologies	Ontario	2 of 15
Technotronix	Illinois	2 of 15

One of these yours?

A complete Blue Book listing is one of the sources assistants read in this category. Confirming your details is free.

Get your monthly report

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 electronic contract manufacturing and PCB assembly companies in California”
2“Who supplies turnkey surface-mount PCB assembly for low-to-mid volume production in California”
3“I need a California electronic contract manufacturing partner for a 5,000-unit IoT device launch, who should I talk to”
4“Top electronic contract manufacturing and PCB assembly suppliers in California for OEM electronics buyers”
5“Which California electronic contract manufacturers can handle fine-pitch BGA and QFN PCB assembly with functional testing”
6“List 20 electronic contract manufacturing and PCB assembly 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.

sanmina.com
3 companies
neotech.com
3 companies
acme-pcbassembly.com
2 companies
expertassembly.com
2 companies
geamfg.com
2 companies
saicorp.com
2 companies
calpak-usa.com
1 company
ctd-usa.com
1 company
sierraassembly.com
1 company
technologyqualityintegration.com
1 company
aaelect.com
1 company
abcassembly.com
1 company

77 sources were cited across this cell's answers from 65 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 3rd of 4 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 19%.

Pennsylvania22%
Illinois21%
California18%
New York16%

California (this report)Other measured statesCategory average (19%)

Look up a company

Enter a domain or a company name to see whether it is tracked in this cell, and whether the answers named it. This is a lookup against a measurement already taken, so it is instant.

Try yic-assm.com or any other domain

The public Index publishes one measurement per cell. A monthly report covers your own company:

Every question it was named on
Every question it was not
What moved

Your own position is only ever shown to you.