Company lists · Data refreshed September 2026

Top 25 Family office accounting firms worldwide

Name: Family office accounting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 19,551 companies tracked

RevenueBase identified 19,551 family office accounting firms worldwide as of September 2026 and tracks 169,331 professional contacts across them, including 67,864 with verified work emails. The United States is the largest market and London the largest hub.

This list covers family office accounting firms worldwide, 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 28, 2026. Country and city lists for family office accounting firms follow the table.

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 28, 2026 86% judged on-target in blind review

19,551Companies

169,331Contacts tracked

67,864Verified emails

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The 25 largest family office accounting firms worldwide

Ranked by team size

Top 25 of 19,551 family office accounting firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to family office accounting firms: 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	Findex	Indirect evidence	Melbourne, AustraliaHQ checked Sep 28, 2026	1,001-5,000	1,664 contacts →
	Indirect evidence “We’re here to help you build financial security and grow your wealth with confidence.” Source: RevenueBase Database · checked Sep 28, 2026
2	Richter	Partial evidence	Montreal, QC, CanadaHQ checked Sep 28, 2026	501-1,000	804 contacts →
	Partial evidence “Richter est un Bureau Familial \| d’Affaires qui fournit des conseils stratégiques sur les questions d’affaires et sur les objectifs financiers et personnels des familles à travers…” Source: RevenueBase Database · checked Sep 28, 2026
3	Armstrong Watson	Indirect evidence	Carlisle, United KingdomHQ checked Sep 28, 2026	501-1,000	579 contacts →
	Indirect evidence “Armstrong Watson has been advising and protecting clients across the North of England and Scotland since 1867.” Source: RevenueBase Database · checked Sep 28, 2026
4	Buzzacott	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	575 contacts →
	Indirect evidence “Buzzacott is an accountancy and advisory firm with a long-standing history of supporting individuals, businesses, and not-for-profits.” Source: RevenueBase Database · checked Sep 28, 2026
5	Vandelanotte	Indirect evidence	Kortrijk, BelgiumHQ checked Sep 28, 2026	501-1,000	564 contacts →
	Indirect evidence “Vandelanotte, opgericht in 1948 door Roger Vandelanotte, is uitgegroeid tot het grootste onafhankelijke kantoor in België, met ook een vestiging in Rijsel (Frankrijk).” Source: RevenueBase Database · checked Sep 28, 2026
6	MAI Capital Management	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 28, 2026	501-1,000	520 contacts →
	Indirect evidence “Founded on a handshake in 1973 between Arnold Palmer and legendary sports agent, Mark McCormack, MAI Capital Management was created with the sole purpose of making clients’ lives…” Source: RevenueBase Database · checked Sep 28, 2026
7	FED	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	n/a	474 contacts →
	Indirect evidence “La FED est une société d’expertise-comptable avec une mission précise : accompagner les entrepreneurs,favoriser leur réussite.Grâce à nos valeurs, nous bâtissons une relation de…” Source: RevenueBase Database · checked Sep 28, 2026
8	Citadel Investment Services	Indirect evidence	Lynnwood Manor, South AfricaHQ checked Sep 28, 2026	201-500	379 contacts →
	Indirect evidence “Far more than specialist wealth managers, we’re here to secure and grow your wealth, so that you have the freedom to choose the size of your dreams and the content of your next…” Source: RevenueBase Database · checked Sep 28, 2026
9	Cyrus Herez	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	201-500	378 contacts →
	Indirect evidence “Chez Cyrus Herez, nous portons une ambition claire : réinventer l’accompagnement patrimonial en apportant à nos clients sérénité et liberté, grâce à une vision globale, une…” Source: RevenueBase Database · checked Sep 28, 2026
10	Trove Fs, LLC	Strong evidence	Stamford, CT, United StatesHQ checked Sep 28, 2026	51-200	290 contacts →
	Strong evidence “Trove is an independent, fee-only multi-family office serving ultra-high-net-worth families and privately held businesses.” Source: RevenueBase Database · checked Sep 28, 2026
11	Mercer & Hole	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	284 contacts →
	Indirect evidence “A forward-thinking accountancy firm with our clients’ vision at the centre of everything we do.” Source: RevenueBase Database · checked Sep 28, 2026
12	Transaction Square	Indirect evidence	Mumbai, IndiaHQ checked Sep 28, 2026	201-500	274 contacts →
	Indirect evidence “Transaction Square is a Tax, Regulatory and Business Advisory firm founded by entrepreneurial Big-4 Partners having collective advisory experience spanning over 3 decades.” Source: RevenueBase Database · checked Sep 28, 2026
13	Ersel Banca Privata	Indirect evidence	Torino, ItalyHQ checked Sep 28, 2026	201-500	273 contacts →
	Indirect evidence “From the 1936 expert in the management of patrimonies, Ersel is an unique reality in the Italian panorama, for the absolute independence, for the professionalism and the quality…” Source: RevenueBase Database · checked Sep 28, 2026
14	ATA	Partial evidence	Jackson, TN, United StatesHQ checked Sep 28, 2026	201-500	224 contacts →
	Partial evidence “ATA is one of the largest accounting and consulting firms in the Mid-South and was named the ninth (9th) largest accounting firm in the State of Tennessee by American Business…” Source: RevenueBase Database · checked Sep 28, 2026
15	Mutual Trust PTY LTD	Partial evidence	Melbourne, AustraliaHQ checked Sep 28, 2026	51-200	218 contacts →
	Partial evidence “Mutual Trust provides integrated wealth and professional services to some of Australia’s most successful families, family businesses, trustees, not-for-profits and individuals.” Source: RevenueBase Database · checked Sep 28, 2026
16	Kelly Partners Accountants	Indirect evidence	North Sydney, AustraliaHQ checked Sep 28, 2026	201-500	204 contacts →
	Indirect evidence “We exist to make the people, businesses and communities we serve be better off.” Source: RevenueBase Database · checked Sep 28, 2026
17	CT Accountants Advisers	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 28, 2026	51-200	189 contacts →
	Indirect evidence “The truth is, you are as much CT as we are.” Source: RevenueBase Database · checked Sep 28, 2026
18	Aallon Group	Indirect evidence	Helsinki, FinlandHQ checked Sep 28, 2026	201-500	178 contacts →
	Indirect evidence “Olemme asiantunteva, pitkiä asiakassuhteita ja kasvollista palvelua vaaliva taloushallinnon luotettava kumppanisi.” Source: RevenueBase Database · checked Sep 28, 2026
19	Portofino Multi Family Office	Indirect evidence	São Paulo, BrazilHQ checked Sep 28, 2026	51-200	177 contacts →
	Indirect evidence “Em 2012, Carolina Giovanella fundou a Portofino para cuidar do patrimônio da própria família.” Source: RevenueBase Database · checked Sep 28, 2026
20	Prime Financial Group	Indirect evidence	Southbank, AustraliaHQ checked Sep 28, 2026	201-500	169 contacts →
	Indirect evidence “Prime Financial Group is an ASX-listed, market-leading financial service firm, delivering integrated Advice, Capital, and Asset Management solutions to high-net-worth individuals…” Source: RevenueBase Database · checked Sep 28, 2026
21	Zeifmans	Partial evidence	Toronto, ON, CanadaHQ checked Sep 28, 2026	51-200	168 contacts →
	Partial evidence “Zeifmans is a full-service tax, accounting and consulting firm based in Toronto, Canada.” Source: RevenueBase Database · checked Sep 28, 2026
22	Groupe Euodia	Indirect evidence	Neuilly-sur-seine, FranceHQ checked Sep 28, 2026	n/a	159 contacts →
	Indirect evidence “Cabinet en gestion de patrimoine à Paris.” Source: RevenueBase Database · checked Sep 28, 2026
23	Wilson Partners	Partial evidence	Maidenhead, United KingdomHQ checked Sep 28, 2026	201-500	157 contacts →
	Partial evidence “Accounting - Tax - Corporate Finance To the entrepreneurs, business owners and investors who are the lifeblood of UK business.” Source: RevenueBase Database · checked Sep 28, 2026
24	Duffy Kruspodin, LLP	Indirect evidence	Woodland Hills, CA, United StatesHQ checked Sep 28, 2026	201-500	156 contacts →
	Indirect evidence “Duffy Kruspodin, LLP is a Southern California CPA and advisory firm built on long-standing relationships, dependable guidance, and deep financial and business expertise.” Source: RevenueBase Database · checked Sep 28, 2026
25	Ormerod Rutter Chartered Accountants	Indirect evidence	Droitwich, United KingdomHQ checked Sep 28, 2026	51-200	151 contacts →
	Indirect evidence “For 40 years, Ormerod Rutter have offered the specialist hands-on support that clients need to handle all of their tax, business and financial affairs.” Source: RevenueBase Database · checked Sep 28, 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: family office accounting firms. 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 family office accounting firms.
Partial evidence: Its own public description names part of family office accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name family office accounting firms. 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 19,551 family office accounting firms worldwide

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Family office accounting firms worldwide at a glance

As of Sep 28, 2026

40.1%Verified-email coverage

8.7Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

12,798

11-50

5,639

51-200

783

201-500

127

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 family office accounting firms, 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.
Coverage: Every country. Country and city lists for family office accounting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “family office accounting firms”. 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 family office accounting firms), 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 family office accounting firms, and records with no verified work email.
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, 67,864 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 28, 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.

Family office accounting firms by location

97 lists · largest first

Every Family office accounting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 family office accounting firms, 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 family office accounting firms are there worldwide?

RevenueBase identified 19,551 family office accounting firms worldwide 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?

Findex, headquartered in Melbourne, tops this list with the largest team on record.

Which country has the most family office accounting firms?

The United States leads with 6,459 companies, followed by the United Kingdom (1,240) and Australia (1,033). Every family office accounting firms list by country and city is linked on this page.

Which city has the most family office accounting firms?

London leads with 380 headquartered companies, followed by New York (258) and Paris (212).

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 67,864 verified decision-maker contacts tracked across these 19,551 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 28, 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.