Company lists · Data refreshed October 2026

Top 11 International tax accounting firms based in Oakville, Canada

RevenueBase identified 27 company matches for international tax accounting firms associated with Oakville, Canada as of October 2026 and tracks 131 professional contacts across them, including 47 with verified work emails. Across Canada, Toronto is the largest hub for this category (179 companies); Oakville has 27.

This list covers company matches for international tax accounting firms associated with Oakville, Canada, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built
27Companies
131Contacts tracked
47Verified emails
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The 11 largest international tax accounting firms based in Oakville, Canada

Ranked by team size
Top 11 of 27 company matches for international tax accounting firms based in Oakville, Canada, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchOakville, ON, CanadaHQ recorded Oct 1, 202611-5017 contacts →

Exact match

“Continuing a tradition of service to Oakville.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2Exact matchOakville, ON, CanadaHQ recorded Oct 1, 202611-5012 contacts →

Exact match

“BIG FIRM EXPERTISE, SMALL FIRM CARE.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3Exact matchOakville, ON, CanadaHQ recorded Oct 1, 202611-5011 contacts →

Exact match

“Glenn Graydon Wright LLP Chartered Professional Accountants has been a trusted and reliable presence in Oakville, Ontario since 1958.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-1010 contacts →

Exact match

“We offer a full suite of accounting and taxation services tailored to your personal and business needs.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-109 contacts →

Exact match

“IDM is a boutique tax accounting firm founded in 2012 that is dedicated to providing clients with premium tax and accounting services.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-106 contacts →

Exact match

“Streamlined, integrated, and full-service tax and financial planning firm for high-income earning families and entrepreneurs.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-106 contacts →

Exact match

“We are the company in oakville with an exclusive focus on us tax assisting both individual and business taxpayers.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8Exact matchOakville, ON, CanadaHQ recorded Oct 1, 202611-503 contacts →

Exact match

“We specialise in: US Personal & Corporate, Tax Bookkeeping Accounting Audit US Citizens living, working or investing in Canada or in the US.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-103 contacts →

Exact match

“U.S.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10Exact matchOakville, ON, CanadaHQ recorded Oct 1, 202611-501 contacts →

Exact match

“George Khalil CPA Professional Corporation is a licensed public accounting firm located in Oakville, Ontario.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11Exact matchOakville, ON, CanadaHQ recorded Oct 1, 20261-101 contacts →

Exact match

“We deliver proactive accounting and tax solutions for individuals and businesses.”

Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase

Showing 11 of 27 international tax accounting firms based in Oakville, Canada

See the full list, filter by size, metro and specialty, and access 47 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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International tax accounting firms based in Oakville, Canada at a glance

As of Oct 1, 2026
35.9%Verified-email coverage
4.9Average contacts per company
1-10Median size (employees)
Oct 1, 2026Page data refreshed

Companies by employee count

1-10
16
11-50
11

Email recency for this list is measured across the whole Canada list rather than for Oakville, so it is reported there. Company counts and contact totals on this page are exact for Oakville, over 27 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with Oakville, Canada whose business descriptions match “international tax accounting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 47 professional contacts with verified work emails across the full matched dataset. 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 October 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “international tax accounting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many international tax accounting firms are there based in Oakville, Canada?

RevenueBase identified 27 company matches for international tax accounting firms associated with Oakville, Canada as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Henderson Roller Partnership Professional Corporation tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in Canada has the most international tax accounting firms?

Toronto leads Canada with 179 company records, followed by Mississauga (106) and Calgary (101). Oakville has 27.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 47 professional contacts with verified work emails tracked across these 27 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 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 SmartSearch, 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.