Lookalikes · Data refreshed November 2026

25 John O'callaghan LTD lookalikes

Compiled by the RevenueBase Data Team Data refreshed Nov 4, 2026 7633 matching companies

Looking for John O'callaghan LTD lookalikes, John O'callaghan LTD competitors or John O'callaghan LTD alternatives? The RevenueBase company graph holds 7633 companies that do what John O'callaghan LTD does, matched at 85%+ measured description similarity (RevenueBase, November 2026). The 25 largest are ranked below by team size; across all 7633 matches RevenueBase tracks 112,644 professional contacts, including 34,743 with verified work emails.

Similarity is measured on what companies actually do, from their business descriptions rather than industry codes, and is shown per row as a percentage. This page keeps only companies at 85%+ measured similarity to John O'callaghan LTD and ranks them by company size. Data current as of November 4, 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 Similarity shown on every row Refreshed Nov 4, 2026 Match quality audited by blind human judging

Reference company

John O'callaghan LTD

“Since our establishment in 1983 we have always believed that our priority is making your business operate as efficiently as possible both from an operational and taxation…”

1-10Employees

7Contacts tracked

6Verified emails

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The 25 largest John O'callaghan LTD competitors and alternatives

Ranked by team size

Top 25 of 7633 companies matching John O'callaghan LTD at 85%+ description similarity, ranked by team size. Similarity is each company's measured match to John O'callaghan LTD (100% = identical). Data refreshed Nov 4, 2026.
#	Company	HQ	Employees	Similarity	Verified emails
1	Kpmg UK	London, GB	10001+	85%	828 contacts →
2	Withum	Princeton, US	1,001-5,000	86%	2,430 contacts →
3	Wipfli	La Crosse, US	1,001-5,000	86%	1,763 contacts →
4	PWC Sweden	Umea, SE	1,001-5,000	86%	124 contacts →
5	Kpmg Poland	Warszawa, PL	1,001-5,000	86%	889 contacts →
6	Reyes Tacandong & CO	Makati, PH	501-1,000	86%	17 contacts →
7	AAB	London, GB	1,001-5,000	87%	885 contacts →
8	COGEP	Saint-Doulchard, FR	1,001-5,000	88%	775 contacts →
9	WTS Deutschland	Hamburg, DE	1,001-5,000	87%	3 contacts →
10	Orcom Cabinet D'expertise Comptable, Audit ET Conseil	Blois, FR	1,001-5,000	87%	451 contacts →
11	Mauldin & Jenkins	Savannah, US	501-1,000	85%	545 contacts →
12	Chevez	Ciudad De Mexico, MX	501-1,000	86%	5 contacts →
13	Clark Schaefer Hackett	Cincinnati, US	501-1,000	85%	164 contacts →
14	Moore MKW	Zwolle, NL	1,001-5,000	85%	535 contacts →
15	CF	Bordeaux, FR	1,001-5,000	86%	275 contacts →
16	CPA Ferrere	Quito, EC	201-500	86%	320 contacts →
17	Citrin Cooperman India LLP	Ahmedabad, AF	201-500	88%	360 contacts →
18	Cohnreznick Professional Services PVT LTD	Chennai, IN	1,001-5,000	86%	172 contacts →
19	BDO Saudi Arabia, Dr. Mohamed Al-Amri & CO	Riyadh, SA	201-500	86%	192 contacts →
20	Lisicki Litvin & Asociados	AR	501-1,000	86%	323 contacts →
21	BDO Ireland	Limerick, IE	201-500	85%	418 contacts →
22	Sensiba LLP	San Ramon, US	501-1,000	87%	350 contacts →
23	Brown Edwards	Lynchburg, US	201-500	86%	432 contacts →
24	Smith Howard	Atlanta, US	501-1,000	88%	370 contacts →
25	WISS	Boca Raton, US	201-500	85%	285 contacts →

Showing the 25 largest of 7633 similar companies

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How similarity works

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.
Matching: Companies are matched on what they actually do, as described in their own business descriptions, never on shared industry codes. The list keeps only matches at 85%+ measured similarity to John O'callaghan LTD, and match quality is audited by blind human judging. Read the full methodology.
Ranking: Team size, largest first, among the matched companies: companies are ordered by the number of professionals RevenueBase tracks at each one. Each row also shows its measured similarity to John O'callaghan LTD as a percentage.
Verification: Contact records re-verify on a rolling cadence rather than being scraped once and left to decay; each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on November 4, 2026. Lists refresh periodically as the graph is re-checked.

Frequently asked

What are John O'callaghan LTD lookalikes?

John O'callaghan LTD lookalikes are companies that closely resemble what John O'callaghan LTD does and sells, based on each company's own business description. The table above ranks the closest matches by company size, with each company's similarity to John O'callaghan LTD shown as a percentage.

What companies are similar to John O'callaghan LTD?

The largest companies similar to John O'callaghan LTD are Kpmg UK, Withum, Wipfli and PWC Sweden. The table above shows the 25 largest of the 7633 matched companies, with each row's similarity shown as a percentage.

How is similarity measured?

Similarity scores how closely a company's business, as described in its own words, matches John O'callaghan LTD's, shown as a percentage (100% = an identical description). The list keeps companies at 85% or above and ranks them by team size.

How do I get contacts at these companies?

A free RevenueBase account lets you run this exact search and work the top matches, verified emails and direct dials included. Upgrading unlocks the 34,743 verified emails and direct dials tracked across all 7633 matched companies.

Who are John O'callaghan LTD's biggest competitors?

The largest John O'callaghan LTD competitors by measured business-description similarity are Kpmg UK, Withum, Wipfli and PWC Sweden. Every company here does what John O'callaghan LTD does at 85%+ similarity, ranked by team size.

What are the best John O'callaghan LTD alternatives?

The closest John O'callaghan LTD alternatives are the companies whose own business descriptions match John O'callaghan LTD's most closely, shown above with each one's similarity as a percentage and ranked by team size.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 4, 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.