AI Visibility Index: Structural Steel Fabrication in California

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

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

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The headline numbers

Never named by AI

224 of 236

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.

12 named at least once
224 never named

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Cell average: 0.14of 15
Across all 236 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 Structural Steel Fabrication companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Whitmore Steel Inc 23 employeesSpring Valley, California 2 name variants Whitmore Steel (WSI Steel)most common9 Whitmore Steel, Inc. (WSI Steel)2	Spring Valley, California	11 of 15 answers
2	Bold Steel Inc. California	California	8 of 15 answers
3	SOS Steel Co. California	California	8 of 15 answers
4	Struc Steel Inc 16 employeesSpring Valley, California 2 name variants Struc Steel, Inc.most common6 Structural Steel Inc.1	Spring Valley, California	7 of 15 answers
5	Cal Steel Group California	California	5 of 15 answers
6	FCP Steel Fab California	California	5 of 15 answers
7	Gleaves Contractors Inc. California	California	4 of 15 answers
8	Summit Steel Works California	California	4 of 15 answers
9	Westco Iron Works California	California	4 of 15 answers
10	Kern Steel Fabrication Inc 75 employeesBakersfield, California	Bakersfield, California	3 of 15 answers

37 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
PMC, Inc.	New York	4 of 15
ACSS Inc.	Arizona	2 of 15
Adams Iron Co.	Illinois	2 of 15
American Iron Inc.	Wisconsin	1 of 15
Bradford Steel, Inc.	Massachusetts	1 of 15
Capitol Iron Works	Maryland	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 structural steel fabrication companies in California”
2“Who supplies custom structural steel building frames in California”
3“I need a California structural steel fabrication partner for a mid-rise commercial project, who should I talk to”
4“Top structural steel fabrication suppliers in California for general contractor buyers”
5“Which California structural steel fabricators can handle large welded assemblies with certified field erection support”
6“List 20 structural steel fabrication 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.

sitevetter.com
6 companies
strucsteel.com
2 companies
canosteelinc.com
2 companies
remosteel.com
2 companies
whitmoresteel.com
2 companies
aisc.org
2 companies
cal-fab.com
2 companies
fcpsteelfab.com
2 companies
joelhewattco.com
2 companies
trufusionsteel.com
2 companies
kernsteel.com
1 company
sossteelco.com
1 company

58 sources were cited across this cell's answers from 50 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 18th of 19 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 11%.

California (this report)Other measured statesCategory average (11%)

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