Company lists · Data refreshed September 2026

Top 25 Full-service commercial law firms based in London, Canada

Name: Full-service commercial law firms based in London, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 38 companies tracked

RevenueBase identified 38 full-service commercial law firms headquartered in London, Canada as of September 2026 and tracks 1,337 professional contacts across them, including 891 with verified work emails. Across Canada, Toronto is the largest hub for this category (774 companies); London has 38.

This list covers full-service commercial law firms headquartered in London, Canada, 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

38Companies

1,337Contacts tracked

891Verified emails

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The 25 largest full-service commercial law firms based in London, Canada

Ranked by team size

Top 25 of 38 full-service commercial law firms based in London, Canada, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to full-service commercial law 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	Lerners LLP	Strong evidence	London, ON, CanadaHQ checked Sep 30, 2026	201-500	450 contacts →
	Strong evidence “Lerners LLP is a full service law firm that has grown to become one of Ontario’s largest firms.” Source: RevenueBase Database · checked Sep 30, 2026
2	Siskinds LLP	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	51-200	271 contacts →
	Partial evidence “Siskinds is one of Southwestern Ontario’s leading law firms.” Source: RevenueBase Database · checked Sep 30, 2026
3	Harrison Pensa LLP	Strong evidence	London, ON, CanadaHQ checked Sep 30, 2026	51-200	176 contacts →
	Strong evidence “Harrison Pensa LLP is a full-service law firm with expertise in litigation, business law and real estate, and a strong focus in family, wills and estate, and personal injury law.” Source: RevenueBase Database · checked Sep 30, 2026
4	Mckenzie Lake Lawyers LLP	Strong evidence	London, ON, CanadaHQ checked Sep 30, 2026	51-200	130 contacts →
	Strong evidence “McKenzie Lake is a full-service law firm with offices in Guelph, London and Strathroy, Ontario.” Source: RevenueBase Database · checked Sep 30, 2026
5	Cohen Highley LLP	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	51-200	104 contacts →
	Indirect evidence “Founded in London ON in 1974, Cohen Highley, opened its sixth branch office in Windsor ON in 2023.” Source: RevenueBase Database · checked Sep 30, 2026
6	Brown Beattie O'donovan LLP	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	40 contacts →
	Indirect evidence “We are a firm that has provided London and Southwestern Ontario with successful legal representation for over 60 years.” Source: RevenueBase Database · checked Sep 30, 2026
7	Scott Petrie LLP LAW Firm	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	18 contacts →
	Partial evidence “The business model for Scott Petrie LLP Law Firm, from the outset, has been the direct delivery of competent legal services by lawyers and staff working within specific areas of…” Source: RevenueBase Database · checked Sep 30, 2026
8	Dyer Brown LLP	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	17 contacts →
	Indirect evidence “Dyer Brown LLP is a company based out of 495 Richmond St, London, Ontario, Canada.” Source: RevenueBase Database · checked Sep 30, 2026
9	Shillington Mccall LLP	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	16 contacts →
	Indirect evidence “Our experience in insurance matters makes us unique in our field.” Source: RevenueBase Database · checked Sep 30, 2026
10	Drake LAW	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	12 contacts →
	Partial evidence “At Drake Law, we pride ourselves on delivering exceptional legal services and innovative solutions that exceed expectations.” Source: RevenueBase Database · checked Sep 30, 2026
11	Wallace Smith Lawyers	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	11 contacts →
	Partial evidence “Wallace Smith Lawyers is a boutique law firm based in the heart of London, Ontario, offering specialized services in civil litigation with a focus on personal injury, insurance…” Source: RevenueBase Database · checked Sep 30, 2026
12	Advocates LLP	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	10 contacts →
	Partial evidence “Started in 1996, the litigation law firm of Advocates LLP has been a pioneer in the use of integrated computer technology and its application in the practice of law.” Source: RevenueBase Database · checked Sep 30, 2026
13	Hassan LAW	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	8 contacts →
	Partial evidence “Many people go through their entire lives without contacting a lawyer or law firm.” Source: RevenueBase Database · checked Sep 30, 2026
14	Lexcor Business Lawyers LLP	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	7 contacts →
	Partial evidence “At Lexcor Business Lawyers LLP, our trade-mark is Strictly Business® - which simply means that our practice is restricted to business law - providing first class legal advice to…” Source: RevenueBase Database · checked Sep 30, 2026
15	Spero LAW	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	6 contacts →
	Partial evidence “We believe that strength of a law firm does not rest in the number of lawyers within the firm, but in the commitment of each lawyer to provide the highest possible degree of…” Source: RevenueBase Database · checked Sep 30, 2026
16	Lazar LAW Firm	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	6 contacts →
	Partial evidence “Lazar Law is primarily a solicitor practice, offering services in Real Estate, Wills and Estates, and Business Law.” Source: RevenueBase Database · checked Sep 30, 2026
17	Amin LAW Professional Corporation	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	6 contacts →
	Indirect evidence “Whether you’re involved in the criminal justice system, looking to buy/sell a home, or just plan for the future, we offer wise guidance and support that will save you time, energy…” Source: RevenueBase Database · checked Sep 30, 2026
18	Belecky & Belecky	Strong evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	3 contacts →
	Strong evidence “Belecky & Belecky is a full-service general practice law firm which has provided legal services to London and South-Western Ontario for over 40 years.” Source: RevenueBase Database · checked Sep 30, 2026
19	Chinneck LAW Professional Corporation	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	11-50	2 contacts →
	Partial evidence “Chinneck Law Professional Corporation is a Law Firm located at 37 Ridout St S, LONDON, Ontario, Canada.” Source: RevenueBase Database · checked Sep 30, 2026
20	Ledroit LAW	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
21	Menear Worrad & Associates	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	2 contacts →
	Indirect evidence “Menear Worrad & Associates has been Specializing in Service for over 40 years.” Source: RevenueBase Database · checked Sep 30, 2026
22	Macdonald Evenden	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
23	Carlyle Peterson Lawyers LLP	Indirect evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	1 contacts →
	Indirect evidence “Contact the experienced London lawyers at Carlyle Peterson LLP for legal assistance with all your real property, estate and business needs.” Source: RevenueBase Database · checked Sep 30, 2026
24	Jbrennan LAW	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	1 contacts →
	Partial evidence “As a dedicated legal practitioner, I specialize in a diverse range of areas including commercial litigation, shareholder/partnership disputes, liquor license regulatory defense…” Source: RevenueBase Database · checked Sep 30, 2026
25	Jeff Conway LAW	Partial evidence	London, ON, CanadaHQ checked Sep 30, 2026	1-10	1 contacts →
	Partial evidence “Operating as a small firm in London, Ontario, Jeff Conway Law creates a personable, attentive and client-oriented environment.” 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: full-service commercial law 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 full-service commercial law firms.
Partial evidence: Its own public description names part of full-service commercial law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name full-service commercial law 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 38 full-service commercial law firms based in London, Canada

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Full-service commercial law firms based in London, Canada at a glance

As of Sep 30, 2026

66.6%Verified-email coverage

35.2Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole Canada list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 38 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 full-service commercial law 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.
What qualifies: Companies headquartered in London, Canada whose own description of what they do matches “full-service commercial law 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 full-service commercial law 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 full-service commercial law firms, and records with no verified work email. Companies headquartered outside London 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, 891 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.

Full-service commercial law firms by metro in Canada

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 full-service commercial law 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 full-service commercial law firms are there based in London, Canada?

RevenueBase identified 38 full-service commercial law firms headquartered in London, Canada 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?

Lerners LLP, headquartered in London, tops this list with the largest team on record.

Which city in Canada has the most full-service commercial law firms?

Toronto leads Canada with 774 headquartered companies, followed by Montreal (264) and Vancouver (225). London has 38.

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 891 verified decision-maker contacts tracked across these 38 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.