Sheet Metal
CA holds 22.9% of the indexed Sheet Metal suppliers across 39 states. The supply base is unconcentrated (HHI 940).
How to read this
HHI is the sum of squared shares, from near zero when supply is spread evenly to 10,000 when one state holds all of it. Above 2,500 is treated as highly concentrated, between 1,500 and 2,500 as moderately so.
Effective states is the number of equal-sized states that would produce the same HHI. It is the plainer version of the same fact: 10.6 states' worth of capability supply, spread across 39.
Measured Sep 21, 2026 over the manufacturers BOMForge has indexed. Our coverage is not the whole country, so a share here is a share of what is indexed.
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