Company lists · Data refreshed September 2026

Top 25 Insurance defense law firms based in Chicago, United States

Name: Insurance defense law firms based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 166 companies tracked

RevenueBase identified 166 insurance defense law firms headquartered in Chicago, United States as of September 2026 and tracks 5,466 professional contacts across them, including 2,884 with verified work emails. New York is the largest hub.

This list covers insurance defense law firms headquartered in Chicago, United States, 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 14, 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 14, 2026 86% judged on-target in blind review

166Companies

5,466Contacts tracked

2,884Verified emails

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The 25 largest insurance defense law firms based in Chicago, United States

Ranked by team size

Top 25 of 166 insurance defense law firms based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to insurance defense 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	O'hagan Meyer	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	501-1,000	579 contacts →
	Strong evidence “As a national law firm defending corporations, non-profits, associations and their officers & directors in every manner of litigation, O'Hagan Meyer provides individualized…” Source: RevenueBase Database · checked Sep 14, 2026
2	Litchfield Cavo LLP	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	501-1,000	424 contacts →
	Strong evidence “Litchfield Cavo LLP began as a small firm of attorneys experienced in insurance and business defense matters.” Source: RevenueBase Database · checked Sep 14, 2026
3	Swanson, Martin & Bell, LLP	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	201-500	254 contacts →
	Indirect evidence “Swanson, Martin & Bell, LLP was founded in 1992 by a group of trial lawyers who left a large Chicago firm to better serve the needs of their clients.” Source: RevenueBase Database · checked Sep 14, 2026
4	Tressler LLP	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	237 contacts →
	Partial evidence “Tressler LLP is a national law firm headquartered in Chicago, with ten offices located in six states - California, Illinois, Missouri, New Jersey, New York and Pennsylvania.” Source: RevenueBase Database · checked Sep 14, 2026
5	Clausen Miller P.C	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	201-500	232 contacts →
	Indirect evidence “Founded over 80 years ago, Clausen Miller represents businesses, insurers and professionals through strategic, cost-effective litigation and counseling across the nation and…” Source: RevenueBase Database · checked Sep 14, 2026
6	Cassiday Schade LLP	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	186 contacts →
	Partial evidence “Cassiday Schade is a litigation law firm headquartered in Chicago, with national presence.” Source: RevenueBase Database · checked Sep 14, 2026
7	Nicolaides Fink Thorpe Michaelides Sullivan LLP	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	138 contacts →
	Partial evidence “Nicolaides Fink Thorpe Michaelides Sullivan LLP is dedicated to serving the insurance industry throughout the world in evaluating and resolving their most complex risks.” Source: RevenueBase Database · checked Sep 14, 2026
8	Wiedner & Mcauliffe, LTD	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	132 contacts →
	Partial evidence “Wiedner & McAuliffe is a Chicago-based workers’ compensation defense and civil litigation firm.” Source: RevenueBase Database · checked Sep 14, 2026
9	ALAS	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	128 contacts →
	Strong evidence “Attorneys' Liability Assurance Society (ALAS) was founded by its owner-insured law firms to provide a superior source of insurance coverage along with a level of service that…” Source: RevenueBase Database · checked Sep 14, 2026
10	Batescarey LLP	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	101 contacts →
	Strong evidence “BatesCarey LLP has dedicated its practice to protecting the interests of insurers and reinsurers while shaping the trends of insurance law throughout the United States and abroad.” Source: RevenueBase Database · checked Sep 14, 2026
11	Foran Glennon Palandech Ponzi & Rudloff	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	100 contacts →
	Indirect evidence “Since 2001, Foran Glennon has provided sophisticated legal services in a cost-effective manner.” Source: RevenueBase Database · checked Sep 14, 2026
12	Horwitz, Horwitz & Associates	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	92 contacts →
	Indirect evidence “Since 1924, our family has continued a tradition begun by Jacob W.” Source: RevenueBase Database · checked Sep 14, 2026
13	Nyhan, Bambrick, Kinzie, & Lowry	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	80 contacts →
	Partial evidence “We are trusted attorneys and trusted advisors to a wide range of employers, insurance carriers and third party administrators.” Source: RevenueBase Database · checked Sep 14, 2026
14	Pretzel & Stouffer, Chartered	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	78 contacts →
	Indirect evidence “Proven results.” Source: RevenueBase Database · checked Sep 14, 2026
15	Donohue Brown Smyth LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	76 contacts →
	Indirect evidence “If you are searching for the highest level of skill and professional legal service, you have arrived at the right place.” Source: RevenueBase Database · checked Sep 14, 2026
16	Sinars Slowikowski LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	70 contacts →
	Partial evidence “With offices in Illinois, Missouri, and Texas, Sinars Slowikowski is dedicated to defending product manufacturers, premises owners, distributors and contractors in all aspects of…” Source: RevenueBase Database · checked Sep 14, 2026
17	Robbins Schwartz	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	69 contacts →
	Indirect evidence “We are a team of problem solvers.” Source: RevenueBase Database · checked Sep 14, 2026
18	BCM Law, P.C	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	54 contacts →
	Strong evidence “BCM Law was founded in 1997 with a vision to provide skilled and aggressive defense for Employers and Insurers for complex legal matters such as Workers’ Compensation Defense…” Source: RevenueBase Database · checked Sep 14, 2026
19	Christensen HSU Sipes LLP	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	53 contacts →
	Partial evidence “Christensen Hsu Sipes LLP is a law firm with offices in Chicago, Northwest Indiana, Los Angeles, and Sacramento.” Source: RevenueBase Database · checked Sep 14, 2026
20	Walker Wilcox Matousek LLP	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	47 contacts →
	Indirect evidence “Walker Wilcox, with offices in Chicago and Houston, provides our clients with effective and innovative legal services that deliver value and solutions.” Source: RevenueBase Database · checked Sep 14, 2026
21	Best, Vanderlaan & Harrington	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	47 contacts →
	Indirect evidence “Our practice is the evolution of a practice started by Jim Best over thirty-five years ago, which has grown into a mid-size firm with a reputation for excellence.” Source: RevenueBase Database · checked Sep 14, 2026
22	Ifmk Law, LTD	Strong evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	46 contacts →
	Strong evidence “A successful team of experienced attorneys who are well-recognized in public entity defense practice and employment law services for public and private sector clients throughout…” Source: RevenueBase Database · checked Sep 14, 2026
23	Esbrook P.C	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	51-200	44 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
24	Nielsen, Zehe & Antas P.C	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	41 contacts →
	Indirect evidence “NZA is a partnership of acclaimed trial and litigation lawyers, fearless and accomplished in their representation of their clients' interests anywhere in the U.S.” Source: RevenueBase Database · checked Sep 14, 2026
25	Cray Huber Horstman Heil & Vanausdal LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	41 contacts →
	Partial evidence “Cray Huber is a Chicago-based law firm with a national litigation practice.” Source: RevenueBase Database · checked Sep 14, 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: insurance defense 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 insurance defense law firms.
Partial evidence: Its own public description names part of insurance defense law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name insurance defense 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 166 insurance defense law firms based in Chicago, United States

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Insurance defense law firms based in Chicago, United States at a glance

As of Sep 14, 2026

52.8%Verified-email coverage

32.9Average contacts per company

11-50Median size (employees)

141.6%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 166 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 insurance defense 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 Chicago, United States whose own description of what they do matches “insurance defense 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 insurance defense 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 insurance defense law firms, and records with no verified work email. Companies headquartered outside Chicago 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, 2,884 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 14, 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.

Insurance defense law firms by metro in the United States

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 insurance defense 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 insurance defense law firms are there based in Chicago, United States?

RevenueBase identified 166 insurance defense law firms headquartered in Chicago, United States 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?

O'hagan Meyer, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most insurance defense law firms?

New York leads with 235 headquartered companies, followed by Houston (178) and Chicago (166).

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 2,884 verified decision-maker contacts tracked across these 166 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 14, 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.