Company lists · Data refreshed September 2026
Top 25 All-boys high schools based in the United Kingdom
RevenueBase identified 230 all-boys high schools headquartered in the United Kingdom as of September 2026 and tracks 9,150 professional contacts across them, including 2,283 with verified work emails. London is the largest hub.
This list covers all-boys high schools 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 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.
The 25 largest all-boys high schools based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 411 contacts → | ||||
Partial evidence “Harrow School is one of the world’s most well-known schools.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 329 contacts → | ||||
Partial evidence “Shrewsbury School was founded by Edward VI by Royal Charter in 1552, and it was identified as one of the ‘Great’ public schools by the Clarendon Commission 1868.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 266 contacts → | ||||
Partial evidence “Founded in 597AD, The King’s School is reputedly the oldest school in the world.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 220 contacts → | ||||
Strong evidence “The Grammar School at Leeds (GSAL) is a leading independent school for boys and girls aged 2-18.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 219 contacts → | ||||
Partial evidence “Warwick School has a very long and rich history stretching back reputedly to 914, making it one of the oldest schools in the country.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 185 contacts → | ||||
Partial evidence “Westminster School's and Westminster Under School's reputations as centres of academic excellence are built upon our pupils’ genuine enjoyment of open-minded enquiry, rigorous…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 179 contacts → | ||||
Partial evidence “Radley College prepares boys for a life of purpose, leadership and happiness.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 177 contacts → | ||||
Partial evidence “The Manchester Grammar School is one of the nation’s truly great schools.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 134 contacts → | ||||
Partial evidence “Nestled in the picturesque Dorset countryside, Clayesmore is not just a school; it's a vibrant community where students thrive both academically and personally.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 130 contacts → | ||||
Partial evidence “Barking Abbey School was founded in 1922 as one of the first co-educational grammar schools in England.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 106 contacts → | ||||
Strong evidence “At Watford Grammar School for Boys we aim to take every student in our care on a most extraordinary journey, and one which can nurture the talent and provide the skills and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 92 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 83 contacts → | ||||
Partial evidence “Walton High aims to enhance and enrich the lives of children and young people by enabling them to make the most of outstanding learning opportunities within and beyond the…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 74 contacts → | ||||
Indirect evidence “Cotham has an excellent reputation in Bristol built on our specialisms in Performing Arts, Maths and Computing and an outstanding GCSE and A Level examination record that is…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 73 contacts → | ||||
Partial evidence “Burnham Grammar School’s aim is for every individual student to ‘Embrace Challenge’ on their journey to academic and personal success.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 73 contacts → | ||||
Strong evidence “We are a thriving, ambitious, and welcoming school community that delivers a world-class education for boys and girls in East London.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 73 contacts → | ||||
Strong evidence “The Mill Hill Schools comprise of Grimsdell Pre-Preparatory School, Belmont Preparatory School, Mill Hill School and Mill Hill International offering education to boys and girls…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 71 contacts → | ||||
Partial evidence “George Abbot is an outstanding, non-selective secondary school.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 67 contacts → | ||||
Strong evidence “Poole Grammar is a secondary-maintained all boys grammar school based on Gravel Hill, on the northern edge of the busy town of Poole and within easy reach of the beautiful Poole…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 65 contacts → | ||||
Strong evidence “Dame Allan’s Schools were founded in 1705 by Dame Eleanor Allan to provide a ‘proper education’ for boys and girls in Newcastle.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 64 contacts → | ||||
Strong evidence “Richard Challoner is a highly successful Catholic school for boys aged 11-18 and girls 16-18 which has served the local Catholic community since 1959.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 61 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 61 contacts → | ||||
Partial evidence “The Judd School is a special place to learn and grow, for students and staff.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 58 contacts → | ||||
Indirect evidence “Founded in 1656 by Newport haberdasher and businessman William Adams.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 57 contacts → | ||||
Partial evidence “The Cardinal Vaughan Memorial School was founded in 1914 and is a national memorial to Cardinal Herbert Vaughan, the third Archbishop of Westminster.” Source: RevenueBase Database · checked Sep 19, 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: all-boys high schools. 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 all-boys high schools.
- Partial evidence
- Its own public description names part of all-boys high schools, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name all-boys high schools. 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 230 all-boys high schools based in the United Kingdom
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All-boys high schools based in the United Kingdom at a glance
As of Sep 19, 2026Companies by employee count
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 230 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 all-boys high schools, 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 “all-boys high schools”. 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 all-boys high schools), 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 all-boys high schools, 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, 2,283 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.
All-boys high schools by metro
- All-boys high schools in London34
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 all-boys high schools, 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 all-boys high schools are there based in the United Kingdom?
RevenueBase identified 230 all-boys high schools 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?
Harrow School, headquartered in Harrow On The Hill, tops this list with the largest team on record.
Which city has the most all-boys high schools?
London leads with 34 headquartered companies, followed by Belfast (4) and Birmingham (4).
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 2,283 verified decision-maker contacts tracked across these 230 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.
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