Company lists · Data refreshed September 2026

Top 25 Electrical transformer companies based in the United States

Name: Electrical transformer companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 616 companies tracked

RevenueBase identified 616 electrical transformer companies headquartered in the United States as of September 2026 and tracks 47,534 professional contacts across them, including 17,129 with verified work emails. Houston is the largest hub.

This list covers electrical transformer companies 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 19, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

616Companies

47,534Contacts tracked

17,129Verified emails

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The 25 largest electrical transformer companies based in the United States

Ranked by team size

Top 25 of 616 electrical transformer companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to electrical transformer companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Schweitzer Engineering Laboratories SEL	Partial evidence	Pullman, WA, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,489 contacts →
	Partial evidence “SEL is a globally recognized designer and manufacturer of products and solutions that make electric power safer, more reliable, and more economical.” Source: RevenueBase Database · checked Sep 19, 2026
2	Littelfuse	Partial evidence	Rosemont, IL, United StatesHQ checked Sep 19, 2026	10001+	4,259 contacts →
	Partial evidence “Littelfuse, Inc.(NASDAQ: LFUS) is a diversified, industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy.” Source: RevenueBase Database · checked Sep 19, 2026
3	Hubbell Incorporated	Partial evidence	Shelton, CT, United StatesHQ checked Sep 19, 2026	10001+	4,053 contacts →
	Partial evidence “Hubbell Incorporated is a leading manufacturer of utility and electrical solutions that help build more reliable, resilient, and renewable energy infrastructure.” Source: RevenueBase Database · checked Sep 19, 2026
4	Powell	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,561 contacts →
	Indirect evidence “Powell is hiring- Powell is dedicated to improving people’s lives by providing reliable power distribution systems in every market we serve.” Source: RevenueBase Database · checked Sep 19, 2026
5	Electrical Components International	Partial evidence	Southfield, MI, United StatesHQ checked Sep 19, 2026	10001+	2,200 contacts →
	Partial evidence “Founded in 1953, Electrical Components International (ECI) is one of the world’s leading suppliers of electrical distribution systems, control box assemblies, and other critical…” Source: RevenueBase Database · checked Sep 19, 2026
6	Atkore	Partial evidence	Harvey, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	1,595 contacts →
	Partial evidence “Atkore is a leading manufacturer of electrical products for commercial, industrial, data center, telecommunications, and solar applications.” Source: RevenueBase Database · checked Sep 19, 2026
7	Hubbell Power Systems	Partial evidence	Columbia, SC, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,079 contacts →
	Partial evidence “Hubbell Power Systems (HPS) designs and manufactures a wide variety of electric power transmission, distribution, substation, underground, OEM, and communications products used by…” Source: RevenueBase Database · checked Sep 19, 2026
8	Industrial Electric Mfg. IEM	Partial evidence	Fremont, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	969 contacts →
	Partial evidence “Industrial Electric Mfg.(IEM) is the largest independent full-line manufacturer of electrical distribution equipment and integrated power systems in the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
9	Mitsubishi Electric Power Products, INC	Partial evidence	Warrendale, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	967 contacts →
	Partial evidence “Mitsubishi Electric Power Products, Inc.(MEPPI) is a leading U.S.” Source: RevenueBase Database · checked Sep 19, 2026
10	Howard Industries	Partial evidence	Ellisville, MS, United StatesHQ checked Sep 19, 2026	1,001-5,000	941 contacts →
	Partial evidence “Howard Industries is the leading manufacturer of liquid-filled distribution transformers for the utility and commercial/industrial markets.” Source: RevenueBase Database · checked Sep 19, 2026
11	SAE Towers	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	928 contacts →
	Indirect evidence “SAE Towers is one of the world’s largest producers of steel lattice towers for high-voltage power transmission.” Source: RevenueBase Database · checked Sep 19, 2026
12	Electrical Consultants, INC	Partial evidence	Billings, MT, United StatesHQ checked Sep 19, 2026	1,001-5,000	890 contacts →
	Partial evidence “Electrical Consultants, Inc.(ECI) is an employee-owned, national provider of high voltage transmission, substation, and distribution solutions.” Source: RevenueBase Database · checked Sep 19, 2026
13	Maclean Power Systems	Partial evidence	Fort Mill, SC, United StatesHQ checked Sep 19, 2026	1,001-5,000	858 contacts →
	Partial evidence “MacLean Power Systems (MPS), headquartered in Fort Mill, SC, is LEADING THE WAY™ in delivering innovative, reliable, and resilient solutions for the electric utility…” Source: RevenueBase Database · checked Sep 19, 2026
14	Virginia Transformer Corp	Partial evidence	Roanoke, VA, United StatesHQ checked Sep 19, 2026	5,001-10,000	792 contacts →
	Partial evidence “Virginia Transformer is an engineering company that manufactures transformers.” Source: RevenueBase Database · checked Sep 19, 2026
15	Flanders	Indirect evidence	Evansville, IN, United StatesHQ checked Sep 19, 2026	501-1,000	789 contacts →
	Indirect evidence “FLANDERS, Leverage our legacy.” Source: RevenueBase Database · checked Sep 19, 2026
16	Irby Construction Company	Indirect evidence	Richland, MS, United StatesHQ checked Sep 19, 2026	501-1,000	559 contacts →
	Indirect evidence “Irby Construction Company, a wholly owned subsidiary of Quanta Services, Inc, excels in the processes required for major transmission, substation and distribution line…” Source: RevenueBase Database · checked Sep 19, 2026
17	Wholesale Electric Supply Co. Of Houston, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	544 contacts →
	Partial evidence “Wholesale Electric Supply Company of Houston, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
18	Tdk-Lambda Americas	Indirect evidence	Neptune, NJ, United StatesHQ checked Sep 19, 2026	201-500	540 contacts →
	Indirect evidence “TDK-Lambda Corporation, a group company of TDK Corporation, is a recognized leader and global supplier of power conversion products for industrial and medical equipment worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
19	Ermco-Eci	Partial evidence	Dyersburg, TN, United StatesHQ checked Sep 19, 2026	1,001-5,000	520 contacts →
	Partial evidence “ERMCO (Electric Research and Manufacturing Cooperative, Inc.) is headquartered in Dyersburg, Tennessee.” Source: RevenueBase Database · checked Sep 19, 2026
20	Resa Power	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	511 contacts →
	Indirect evidence “RESA Power is your ONE-STOP for all of your power needs.” Source: RevenueBase Database · checked Sep 19, 2026
21	Asco Power Technologies	Indirect evidence	Florham Park, NJ, United StatesHQ checked Sep 19, 2026	1,001-5,000	468 contacts →
	Indirect evidence “ASCO Power Technologies has provided power reliability solutions for more than 125 years.” Source: RevenueBase Database · checked Sep 19, 2026
22	United Electric Supply	Partial evidence	New Castle, DE, United StatesHQ checked Sep 19, 2026	201-500	351 contacts →
	Partial evidence “Headquartered in New Castle, Delaware, with locations in Delaware, Pennsylvania, New Jersey, Maryland and Virginia, United Electric is a nationally recognized, 100% employee-owned…” Source: RevenueBase Database · checked Sep 19, 2026
23	Independent Electric Supply	Partial evidence	San Leandro, CA, United StatesHQ checked Sep 19, 2026	501-1,000	321 contacts →
	Partial evidence “Independent Electric Supply is now operating as QED (Arizona), OneSource (California) or Irby (Utilities).” Source: RevenueBase Database · checked Sep 19, 2026
24	Maddox Industrial Transformer	Partial evidence	Greer, SC, United StatesHQ checked Sep 19, 2026	201-500	286 contacts →
	Partial evidence “Maddox serves the commercial, industrial, utility, and renewables segments of the transformer market.” Source: RevenueBase Database · checked Sep 19, 2026
25	Milbank Energy At Work	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	501-1,000	266 contacts →
	Indirect evidence “Milbank provides the tools that empower life.” Source: RevenueBase Database · checked Sep 19, 2026

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: electrical transformer companies. 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 electrical transformer companies.
Partial evidence: Its own public description names part of electrical transformer companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical transformer companies. 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 25 of 616 electrical transformer companies based in the United States

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Electrical transformer companies based in the United States at a glance

As of Sep 19, 2026

36.0%Verified-email coverage

77.2Average contacts per company

11-50Median size (employees)

5.5%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

182

11-50

192

51-200

123

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 616 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 electrical transformer companies, 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 “electrical transformer companies”. 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 electrical transformer companies), 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 electrical transformer companies, 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, 17,129 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 19, 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.

Electrical transformer companies by metro

Electrical transformer companies in Houston34

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 electrical transformer companies, 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 electrical transformer companies are there based in the United States?

RevenueBase identified 616 electrical transformer companies 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?

Schweitzer Engineering Laboratories SEL, headquartered in Pullman, tops this list with the largest team on record.

Which city has the most electrical transformer companies?

Houston leads with 34 headquartered companies, followed by Minneapolis (6) and Addison (5).

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 17,129 verified decision-maker contacts tracked across these 616 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 19, 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.