Company lists · Data refreshed September 2026

Top 23 Oilfilled transformer manufacturers based in the United Kingdom

Name: Oilfilled transformer manufacturers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 53 companies tracked

RevenueBase identified 53 oilfilled transformer manufacturers headquartered in the United Kingdom as of September 2026 and tracks 986 professional contacts across them, including 327 with verified work emails. Leeds is the largest hub.

This list covers oilfilled transformer manufacturers headquartered in the United Kingdom, 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 30, 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 30, 2026 86% judged on-target in blind review

53Companies

986Contacts tracked

327Verified emails

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The 23 largest oilfilled transformer manufacturers based in the United Kingdom

Ranked by team size

Top 23 of 53 oilfilled transformer manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to oilfilled transformer manufacturers: 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	Brush Group	Indirect evidence	Loughborough, United KingdomHQ checked Sep 30, 2026	501-1,000	367 contacts →
	Indirect evidence “We support the global drive to net zero with innovative, engineered solutions that address grid resilience and systems challenges, facilitate electrification of transport and…” Source: RevenueBase Database · checked Sep 30, 2026
2	Wilson Power Solutions	Strong evidence	Leeds, United KingdomHQ checked Sep 30, 2026	51-200	136 contacts →
	Strong evidence “Wilson Power Solutions is a power and distribution transformer manufacturer, recognised for pioneering amorphous transformer core technology, making it home to Europe's most…” Source: RevenueBase Database · checked Sep 30, 2026
3	Slaters Electricals	Indirect evidence	Tollbridge Road, United KingdomHQ checked Sep 30, 2026	51-200	42 contacts →
	Indirect evidence “Established for over 100 years, Slaters Electricals Ltd are experts in LV and HV power distribution equipment, installation and support solutions.” Source: RevenueBase Database · checked Sep 30, 2026
4	Bowers Electricals LTD	Indirect evidence	Heanor, United KingdomHQ checked Sep 30, 2026	11-50	38 contacts →
	Indirect evidence “Bowers Electricals are in the 70th year of powering industry and one of the worlds biggest designers and suppliers of energy saving EU Compliant Tier 1 and Tier 2 Distribution and…” Source: RevenueBase Database · checked Sep 30, 2026
5	Transformers & Rectifiers LTD	Strong evidence	Guildford, United KingdomHQ checked Sep 30, 2026	51-200	36 contacts →
	Strong evidence “Transformers & Rectifiers Ltd is a globally recognised specialist in the design, manufacture, and maintenance of liquid-filled and dry-type transformers, as well as transformer…” Source: RevenueBase Database · checked Sep 30, 2026
6	Rosh Engineering LTD	Partial evidence	Blaydon On Tyne, United KingdomHQ checked Sep 30, 2026	11-50	28 contacts →
	Partial evidence “Power transformer repair, refurbishment, supply & installation and enhancement throughout the UK and northern Europe.” Source: RevenueBase Database · checked Sep 30, 2026
7	TMC LTD	Strong evidence	Maldon, United KingdomHQ checked Sep 30, 2026	11-50	24 contacts →
	Strong evidence “TMC (Transformer Manufacturing Company) is a British manufacturer of transformers, power distribution equipment, and associated wound products, with a heritage dating back to 1981.” Source: RevenueBase Database · checked Sep 30, 2026
8	Avon Magnetics LTD	Indirect evidence	Christchurch, United KingdomHQ checked Sep 30, 2026	51-200	21 contacts →
	Indirect evidence “AVON MAGNETICS LIMITED is an electrical/electronic manufacturing company based out of Reid St, Christchurch, DORSET, United Kingdom.” Source: RevenueBase Database · checked Sep 30, 2026
9	IST Power Limited	Strong evidence	Leicester, United KingdomHQ checked Sep 30, 2026	51-200	19 contacts →
	Strong evidence “iST POWER LIMITED is a UK-based manufacturer of high-performance transformers, reactors, and wound components-serving critical infrastructure and industrial applications for over…” Source: RevenueBase Database · checked Sep 30, 2026
10	Carroll & Meynell Transformers	Strong evidence	Eaglescliffe, United KingdomHQ checked Sep 30, 2026	11-50	18 contacts →
	Strong evidence “Carroll and Meynell Transformers Ltd have excelled in the design & manufacture of transformers since 1970.” Source: RevenueBase Database · checked Sep 30, 2026
11	Electro-Wind Limited	Strong evidence	Stoke-on-trent, United KingdomHQ checked Sep 30, 2026	11-50	14 contacts →
	Strong evidence “About Electro-Wind Limited Established in 1979, Electro-Wind Limited is one of the UK's leading independent manufacturers of custom-built transformers, dry type transformers…” Source: RevenueBase Database · checked Sep 30, 2026
12	Transerv Europe Limited	Partial evidence	Stafford, United KingdomHQ checked Sep 30, 2026	11-50	9 contacts →
	Partial evidence “Transerv Europe Limited provide specialist technical services associated with all aspects of installation, commissioning and maintenance of power and distribution transformers, to…” Source: RevenueBase Database · checked Sep 30, 2026
13	Instrument Transformers Limited ITL	Strong evidence	East Kilbride, United KingdomHQ checked Sep 30, 2026	11-50	9 contacts →
	Strong evidence “Instrument Transformers Limited (ITL) is a UK-based designer and manufacturer of Current Transformers (CTs), Voltage Transformers (VTs), sensors, and asset monitoring solutions…” Source: RevenueBase Database · checked Sep 30, 2026
14	Eastern Transformers & Equipment LTD	Partial evidence	Bury St Edmunds, United KingdomHQ checked Sep 30, 2026	11-50	8 contacts →
	Partial evidence “Eastern Transformers & Equipment Ltd was formed in 1984.” Source: RevenueBase Database · checked Sep 30, 2026
15	Himag Planar Magnetics	Partial evidence	Quedgeley, United KingdomHQ checked Sep 30, 2026	11-50	6 contacts →
	Partial evidence “Himag Planar Magnetics possess over two decades of experience in the field of planar transformers with a long term history in inverter technology and PCB design.” Source: RevenueBase Database · checked Sep 30, 2026
16	Admagnetics Manufacturing Division Of ADM Solutions LTD	Indirect evidence	Huncoat, United KingdomHQ checked Sep 30, 2026	1-10	6 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
17	Vigortronix LTD	Strong evidence	Witney, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Strong evidence “Vigortronix Ltd is a leading manufacturer of transformers, power supplies, wound magnetics & has an international reputation for quality.” Source: RevenueBase Database · checked Sep 30, 2026
18	FT Transformers UK LTD	Partial evidence	Kings Norton, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Partial evidence “FT Transformers UK Ltd, formerly known as FT power Transformers & Forrest Transformers.” Source: RevenueBase Database · checked Sep 30, 2026
19	GBE UK	Indirect evidence	Leeds, United KingdomHQ checked Sep 30, 2026	51-200	3 contacts →
	Indirect evidence “GBE.” Source: RevenueBase Database · checked Sep 30, 2026
20	Switchgear Engineering Services LTD	Indirect evidence	Audenshaw, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Indirect evidence “SES provides comprehensive, cost effective solutions for the switchgear industry.” Source: RevenueBase Database · checked Sep 30, 2026
21	Webster-Wilkinson LTD	Strong evidence	Telford, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Strong evidence “For over 50 years, Webster-Wilkinson have designed, manufactured and supplied a comprehensive range of Transformer Components to the Transmission & Distribution marketplace – both…” Source: RevenueBase Database · checked Sep 30, 2026
22	Primary Windings LTD	Strong evidence	Chichester, United KingdomHQ checked Sep 30, 2026	1-10	1 contacts →
	Strong evidence “We are an ISO 9001:2015 certified UK based company that designs and manufactures high quality transformers and wound components for the electronics industry.” Source: RevenueBase Database · checked Sep 30, 2026
23	D.K. Moriarty Limited	Indirect evidence	Colchester Essex, United KingdomHQ checked Sep 30, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 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: oilfilled transformer manufacturers. 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 oilfilled transformer manufacturers.
Partial evidence: Its own public description names part of oilfilled transformer manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oilfilled transformer manufacturers. 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 23 of 53 oilfilled transformer manufacturers based in the United Kingdom

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Oilfilled transformer manufacturers based in the United Kingdom at a glance

As of Sep 30, 2026

33.2%Verified-email coverage

18.6Average contacts per company

11-50Median size (employees)

7.5%Largest-city concentration · Leeds

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 53 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 oilfilled transformer manufacturers, 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 Kingdom whose own description of what they do matches “oilfilled transformer manufacturers”. 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 oilfilled transformer manufacturers), 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 oilfilled transformer manufacturers, and records with no verified work email. Companies headquartered outside United Kingdom 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, 327 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 30, 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 oilfilled transformer manufacturers, 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 oilfilled transformer manufacturers are there based in the United Kingdom?

RevenueBase identified 53 oilfilled transformer manufacturers headquartered in the United Kingdom 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?

Brush Group, headquartered in Loughborough, tops this list with the largest team on record.

Which city has the most oilfilled transformer manufacturers?

Leeds leads with 4 headquartered companies, followed by London (2) and Manchester (2).

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 327 verified decision-maker contacts tracked across these 53 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 30, 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.