Company lists · Data refreshed September 2026
Top 25 Class action law firms based in Chicago, United States
RevenueBase identified 147 class action law firms headquartered in Chicago, United States as of September 2026 and tracks 3,307 professional contacts across them, including 1,703 with verified work emails and 1,674 with mobile numbers. New York is the largest hub.
This list covers class action 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 8, 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.
The 25 largest class action law firms based in Chicago, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 311 contacts → | ||||
Partial evidence “Keller Postman LLC is a national law firm that represents a broad array of clients as plaintiffs in complex litigation at the trial and appellate levels.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 8, 2026Thanks. The Data Team will review it. | |||||
| 3 | 158 contacts → | ||||
Partial evidence “DiCello Levitt LLP is one of the leading plaintiffs’ law firms in the United States.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 4 | 141 contacts → | ||||
Partial evidence “For more than 25 years, the personal injury lawyers at Malman Law have collected hundreds of millions of dollars on behalf of our clients.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 5 | 130 contacts → | ||||
Indirect evidence “Delivering extraordinary results to leading companies and individuals in their most important matters.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 6 | 125 contacts → | ||||
Strong evidence “EDELSON PC is a law firm concentrating on high-stake’s plaintiff’s work ranging from class and mass actions to public client investigations and prosecutions.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 7 | 92 contacts → | ||||
Indirect evidence “Since 1924, our family has continued a tradition begun by Jacob W.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 8 | 82 contacts → | ||||
Partial evidence “The lawyers at Clifford Law Offices represent years of practice in the area of personal injury law including aviation, transportation, medical malpractice and product liability…” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 9 | 81 contacts → | ||||
Indirect evidence “The lawyers at our firm know that personal and quality legal representation mean everything to our clients and their families.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 10 | 78 contacts → | ||||
Indirect evidence “Proven results.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 11 | 74 contacts → | ||||
Partial evidence “Cooney & Conway is a nationally recognized, plaintiff-only law firm based in Chicago, Illinois, with over 60 years of experience representing victims of serious injury and…” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 12 | 72 contacts → | ||||
Indirect evidence “Goldman Ismail Tomaselli Brennan & Baum LLP is a litigation boutique based in Chicago, with offices in Dallas and Santa Monica.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 13 | 65 contacts → | ||||
Indirect evidence “Eimer Stahl is a boutique commercial litigation firm headquartered in Chicago, with offices in Madison, Silicon Valley, San Francisco, and Nashville.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 14 | 61 contacts → | ||||
Strong evidence “Wallace Miller is a plaintiff-side civil litigation law firm handling complex cases nationwide, including personal injury, asbestos, mass torts, class action, and survivor…” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 15 | 58 contacts → | ||||
Partial evidence “Romanucci & Blandin, a Chicago-based personal injury and civil trial practice law firm, represents individuals and their families in catastrophic personal injury matters…” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 16 | 44 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 17 | 42 contacts → | ||||
Indirect evidence “trial lawyers.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 18 | 38 contacts → | ||||
Indirect evidence “We are a trial and appellate litigation firm with a 20-year track record of exceptional outcomes for Fortune 500 companies, middle-market leaders, and entrepreneurs.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 19 | 36 contacts → | ||||
Indirect evidence “Sperling & Slater has a nationwide and international practice focusing on complex commercial and business disputes.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 20 | 36 contacts → | ||||
Strong evidence “Chicago Clearing Corporation is your go-to trusted class actions consultant.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 21 | 32 contacts → | ||||
Indirect evidence “The lawyers at our firm are all devoted to advocating for the voiceless of our society whenever or whatever kind of harm may have befallen them.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 22 | 29 contacts → | ||||
Indirect evidence “Nathan & Kamionski LLP is dedicated to client service at the highest level of professional commitment and quality.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 23 | 27 contacts → | ||||
Partial evidence “Dedication, passion and the courage to try lawsuits are the three qualities that distinguish Williams & John from other law firms.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 24 | 26 contacts → | ||||
Strong evidence “Strauss Borrelli PLLC is an innovative class action practice that seeks to challenge the relationship between individuals and corporations through impact litigation.” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
| 25 | 24 contacts → | ||||
Strong evidence “A class action litigation firm” Source: RevenueBase Database · checked Sep 8, 2026Thanks. The Data Team will review it. | |||||
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: class action 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 class action law firms.
- Partial evidence
- Its own public description names part of class action law firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name class action 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 147 class action law firms based in Chicago, United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,703 reachable decision-makers.
Free signup · no credit card
Class action law firms based in Chicago, United States at a glance
As of Sep 8, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
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 class action 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 “class action 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 class action 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 class action 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, 1,703 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 8, 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.
Class action law firms by metro in the United States
- Class action law firms in New York304
- Class action law firms in Los Angeles222
- Class action law firms in Houston219
- Class action law firms in Chicago178
- Class action law firms in Atlanta139
- Class action law firms in San Diego125
- Class action law firms in Dallas121
- Class action law firms in San Francisco108
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 class action 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 class action law firms are there based in Chicago, United States?
RevenueBase identified 147 class action 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?
Keller Postman LLC, headquartered in Chicago, tops this list with the largest team on record.
Which city has the most class action law firms?
New York leads with 304 headquartered companies, followed by Los Angeles (222) and Houston (219).
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 1,703 verified decision-maker contacts tracked across these 147 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 8, 2026.
Ready to reach these companies? Verified emails and direct dials for all 147 class action law firms based in Chicago, United States. Start with a free account, no credit card.
Download this list →Related lists
Class action law firms by geography
- Class action law firms based in the United States
- Class action law firms based in Brazil
- Class action law firms based in Canada
- Class action law firms based in France
- Class action law firms based in Spain
- Class action law firms based in Germany
- Class action law firms based in the United Kingdom
- Class action law firms based in Australia
- Class action law firms based in the Netherlands
- Class action law firms based in Sao Paulo, Brazil
- Class action law firms based in Toronto, Canada
- Class action law firms based in Atlanta, United States
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Class action law firms based in the United States
- Class action law firms based in Brazil
- Class action law firms based in Canada
- Class action law firms based in France
- Class action law firms based in Spain
- Class action law firms based in Germany