Company lists · Data refreshed September 2026
Top 9 Solar grade silicon refineries based in the United States
RevenueBase identified 36 solar grade silicon refineries headquartered in the United States as of September 2026 and tracks 1,341 professional contacts across them, including 514 with verified work emails. San Francisco is the largest hub.
This list covers solar grade silicon refineries headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 18, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 9 largest solar grade silicon refineries based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 791 contacts → | ||||
Partial evidence “About Hemlock Semiconductor Hemlock Semiconductor Operations (HSC) is a leading provider of hyper-pure polycrystalline silicon (polysilicon) and other silicon-based products used…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 2 | 254 contacts → | ||||
Partial evidence “REC Silicon is a global leader in silane-based, high-purity silicon materials.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 3 | 37 contacts → | ||||
Partial evidence “Mississippi Silicon is the first domestic manufacturer of raw silicon metal built in the past 40 years and produces approximately 10% of all silicon metal used in the United…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 4 | 31 contacts → | ||||
Partial evidence “Cost leading, high-purity silicon solutions for the world.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 5 | 22 contacts → | ||||
Partial evidence “Mitsubishi Polysilicon is an international leader in the production of Ultra-Pure Polycrystalline Silicon for the semiconductor industry.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 6 | 12 contacts → | ||||
Partial evidence “Linton Crystal Technologies (LCT) is the world leader in the design, development and manufacture of equipment for producing monocrystalline ingots for the semiconductor and solar…” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 7 | 5 contacts → | ||||
Partial evidence “Silrec is a multi-faceted organization, offering a wide range of products and services to the semiconductor and solar industries.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 8 | 2 contacts → | ||||
Strong evidence “Leap Photovoltaics is developing a revolutionary process to manufacture crystalline silicon solar cells without wafers.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
| 9 | 2 contacts → | ||||
Partial evidence “NanoPV solar is executing the largest solar manufacturing facility of USA with the most advanced solar technology and highest energy efficiency in the market.” Source: RevenueBase Database · checked Sep 18, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: solar grade silicon refineries. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names solar grade silicon refineries.
- Partial evidence
- Its own public description names part of solar grade silicon refineries, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name solar grade silicon refineries. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 9 of 36 solar grade silicon refineries based in the United States
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Solar grade silicon refineries based in the United States at a glance
As of Sep 18, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 36 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among solar grade silicon refineries, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “solar grade silicon refineries”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names solar grade silicon refineries), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among solar grade silicon refineries, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 514 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 18, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names solar grade silicon refineries, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many solar grade silicon refineries are there based in the United States?
RevenueBase identified 36 solar grade silicon refineries headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Hemlock Semiconductor, headquartered in Hemlock, tops this list with the largest team on record.
Which city has the most solar grade silicon refineries?
San Francisco leads with 4 headquartered companies, followed by Salem (2) and Americus (1).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 514 verified decision-maker contacts tracked across these 36 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 18, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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