| # | Company | Employees |
|---|---|---|
| 1 |
Baker McKenziebakermckenzie.com
Provide practical legal advice combining local knowledge and international expertise to help businesses succeed across global markets. |
11,895 |
| 2 |
Kirkland & Elliskirkland.com
Providing top-tier legal services in corporate transactions, litigation, investigations, and asset management with global reach and innovative approach. |
8,683 |
| 3 |
Sidley Austin LLPsidley.com
Providing comprehensive legal services worldwide, specializing in complex transactions, restructuring, investigations, regulatory, and litigation matters across multiple industries. |
5,113 |
| 4 |
Mayer Brownmayerbrown.com
Representation of major corporations, funds, and financial institutions in complex transactions and disputes across international markets. |
4,544 |
| 5 |
Provanaprovana.com
A company providing credit and collection solutions aimed at driving growth and profitability through workforce optimization and streamlined processes |
3,049 |
| 6 |
Seyfarth Shaw LLPseyfarth.com
Specialized legal firm providing innovative, high-caliber representation in complex litigation, transformational deals, and cross-border projects globally. |
2,326 |
| 7 |
Relativityrelativity.com
A software company offering RelativityOne, a SaaS product for data organization, truth discovery, and action during litigation and investigations in various sectors globally |
1,856 |
| 8 |
Winston & Strawn LLPwinstontaylor.com
Provides comprehensive legal services including litigation, transactions, regulatory advice, and business solutions with a focus on client partnership and inclusion. |
1,752 |
| 9 |
Katten Muchin Rosenman LLPkatten.com
A full-service law firm with nearly 700 attorneys offering high-value legal services globally, specializing in corporate, financial services, litigation, real estate, and more |
1,550 |
| 10 |
Literalitera.com
It specializes in legal technology, offering AI-driven solutions for document management, due diligence, and collaboration for legal teams globally. |
1,535 |
| 11 |
Hinshaw & Culbertson LLPhinshawlaw.com
A US law firm with offices nationwide and in London specializing in insurance, professional services, banking, finance, debt collection, and litigation services |
1,274 |
| 12 |
Jenner & Blockjenner.com
Jenner & Block is a renowned law firm with over 500 lawyers known for fearless advocacy, creative solutions, and shaping legal outcomes |
1,226 |
| 13 |
Cook County State鈥檚 Attorney鈥檚 Officecookcountystatesattorney.org
This company is the second largest prosecutor's office in the nation, responsible for prosecuting crimes in Cook County and providing legal counsel |
1,020 |
| 14 |
Veddervedderprice.com
A global law firm with over 400 professionals providing high-value legal counsel in M&A, banking, litigation, executive compensation, employment law, and more |
899 |
| 15 |
Illinois Attorney General's Officeillinoisattorneygeneral.gov
The company represents the State of Illinois, enforces laws, provides legal representation, and advocates for the people's interests |
823 |
| 16 |
Locke Lord LLPtroutman.com
Premier full-service law firm specializing in complex litigation, regulatory, and transactional work for clients globally, with a focus on diverse industries |
816 |
| 17 |
O'Hagan Meyerohaganmeyer.com
A national law firm specializing in defending corporations in litigation cases, providing tailored services for clients across multiple locations nationwide |
686 |
| 18 |
Cook County Public Defendercookcountypublicdefender.org
A leading criminal defense firm in Cook County, Illinois, providing legal representation to thousands of individuals facing criminal charges and child protection violations |
596 |
| 19 |
Chapman and Cutler LLPchapman.com
A finance-focused law firm providing strategic legal advice to financial companies and investors, offering innovative solutions and fostering a collaborative culture |
583 |
| 20 |
Amundsen Davis, LLCamundsendavislaw.com
A Midwest law firm with 180 attorneys specializing in business law, offering full service in transactional, labor, employment, and litigation matters across the US |
549 |
| 21 |
Faegre Baker Daniels LLP
Faegre Drinker is a combined entity formed by the merger of Faegre Baker Daniels and Drinker Biddle & Reath in February 2020 |
440 |
| 22 |
Litchfield Cavo LLPlitchfieldcavo.com
A national law firm specializing in insurance and business defense matters with offices across the country, providing innovative solutions to clients |
423 |
| 23 |
Envoy Globalenvoyglobal.com
Global immigration services provider offering a platform for seamless international workforce management, combining legal representation and technology to support talent acquisition and compliance |
415 |
| 24 |
Segal McCambridgesegalmccambridge.com
A national law firm with accomplished trial attorneys, representing clients in complex litigation matters across the United States |
398 |
| 25 |
HaystackIDhaystackid.com
HaystackID offers innovative solutions for legal, compliance, regulatory, and cyber challenges worldwide, including advisory services, data discovery, AI-managed review, and custom enterprise solutions |
383 |
| 26 |
Keller Postman LLCkellerpostman.com
National law firm representing plaintiffs in complex litigation at trial and appellate levels, handling class actions, mass actions, arbitrations, and multi-jurisdictional matters |
370 |
| 27 |
Neal, Gerber & Eisenberg LLPnge.com
Provides personalized legal business solutions and litigation services to diverse clients, including Fortune 100 companies and nonprofits. |
355 |
| 28 |
Fulcrum GTfulcrumgt.com
Leader in legal management solutions, offering a comprehensive ecosystem on SAP platform with pre-configured processes, analytics, financials, and world-class support services |
347 |
| 29 |
LegalShield Independent Associate - James Younglegalshield.com
The company offers legal plans to provide accessible and affordable legal protection, offering 24/7 access to top-quality law firms for various legal matters |
342 |
| 30 |
Heyl Roysterheylroyster.com
Regional law firm with over 100 lawyers across seven offices in Illinois and Missouri, offering legal services to businesses, professionals, healthcare organizations, and more |
310 |
| 31 |
LAFlegalaidchicago.org
The company provides free legal services to Cook County residents in poverty, seniors, veterans, and survivors of domestic violence, ensuring equal access to justice |
308 |
| 32 |
Johnson & Bell, Trial Lawyersjohnsonandbell.com
Providing efficient legal counsel to diverse clients in various sectors, delivering viable solutions through courtroom representation, mediation, and business transactions |
245 |
| 33 |
Office of the State Appellate Defenderillinois.gov
A state agency representing indigent individuals in criminal appeals across Illinois, with district offices in five appellate court districts |
240 |
| 34 |
Legal Aid Chicagolegalaidchicago.org
Providing free legal services in civil matters to Cook County residents in poverty and other vulnerable individuals for over 50 years |
225 |
| 35 |
HeplerBroom LLCheplerbroom.com
A legal firm committed to excellence, integrity, and results, providing compelling courtroom advocacy, master strategy, and winning outcomes for clients regionally |
216 |
| 36 |
Goldberg Kohn Ltd.goldbergkohn.com
A Chicago-based commercial law firm specializing in business litigation, finance, bankruptcy, corporate transactions, intellectual property, labor, employment, real estate, and taxation |
186 |
| 37 |
The Codilis Family of Firmscodilis.com
A legal services firm in multiple states, specializing in foreclosure, bankruptcy, and REO title and closing services with a commitment to excellent customer service |
185 |
| 38 |
Hennessy & Roach, P.C.hennessyroach.com
Midwest defense law firm handling Workers Compensation, General Litigation, Auto, Trucking, Premises, Construction, Product, Labor & Employment, Senior Care, and Insurance Defense matters in multiple states Founded in 1993 |
183 |
| 39 |
Kopka Lawkopkalaw.com
Regional law firm specializing in defense for corporations and insurance companies in various litigated matters across multiple states, focusing on exceeding client expectations |
183 |
| 40 |
Hire Counselhirecounsel.com
An agile legal talent company providing on-demand legal professionals to enhance matter management results while prioritizing employee benefits and development |
182 |
| 41 |
HANDLER THAYER, LLPhandlerthayer.com
A full-service law firm offering business, corporate, real estate, estate planning, taxation, and sports/entertainment legal services to a diverse client base |
30 |
| 42 |
Williams, Bax & Saltzman, P.C.wbs-law.com
This company provides exceptional, personalized, and cost-effective legal representation, leveraging over 15 years of experience to achieve effective solutions for clients |
19 |
| 43 |
McCarthy Duffy LLPmccarthyduffy.com
A business-focused law firm providing legal services to businesses, executives, investors, and individuals in various corporate, commercial, banking, transactional, and litigation matters |
18 |
| 44 |
Foster, Buick, Conklin, Lundgren & Gottschalk, LLCfosterbuick.com
Established in 1963, our law firm offers a diverse range of legal services including estate planning, probate, real estate, business planning, and trial practice |
18 |
| 45 |
Messer Strickler Burnette, Ltdmesserstricklerburnette.com
Boutique law firm based in Chicago, serving businesses nationwide with transactional and litigation services, expanding presence in Southeast and Midwest |
18 |
| 46 |
Metcalf & Associates, P.C.askimmigration.com
A legal services firm specializing in providing legal support and expertise to individuals and businesses |
15 |
| 47 |
Burke Burns & Pinelli, Ltd.bbp-chicago.com
Providing top-notch legal advice by combining the resources of a large firm with the personalized service of a small firm |
13 |
| 48 |
Johnson, Bunce & Noble, P.C.peorialawyers.com
A law firm based in Peoria, IL offering services in business, real estate, estate planning, elder law, governmental law, taxation, and litigation |
13 |
| 49 |
O鈥橰ourke & Moody LLPorourkellp.com
Boutique law firm specializing in Gaming, Corporate, Real Estate Law and Litigation, providing personalized, practical, and creative counsel tailored to client needs |
12 |
| 50 |
Churchill, Quinn, Hamilton, & Van Donselaar, Ltd.grayslakelaw.com
A long-standing legal firm in northeast Illinois offering expertise in various legal areas, combining large firm experience with personalized service |
12 |
| 51 |
Klein, Daday, Aretos & O'Donoghue, LLCkdaolaw.com
A law firm committed to understanding and achieving clients' goals through timely, efficient, and ethical legal services in various practice areas |
12 |
| 52 |
Wood, DeVary, Armstrong & Houska, P.C.wdalawyers.com
A full-service law firm providing excellence in legal representation for clients in areas such as estate planning, real estate, business law, and civil litigation |
7 |
| 53 |
Courthouse Couriercourthousecourier.org
A private process serving firm with offices in multiple Illinois cities, specializing in legal document delivery Member of professional associations |
6 |
| 54 |
Walker Morton LLPwalkermortonllp.com
A full service law firm specializing in corporate, employment, capital markets, estate administration, investment funds, litigation, real estate, and tax law |
4 |
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 2, 2026.
More company lists in Illinois
- The largest companies in Illinois 4,689
- Manufacturers in Illinois 529
- Education providers in Illinois 370
- Financial services firms in Illinois 352
- Hardware manufacturers in Illinois 296
- IT Services and IT Consulting companies in Illinois 294
- Hospitals and Health Care companies in Illinois 280
- IT services companies in Illinois 275
- Healthcare providers in Illinois 262
- Retail chains in Illinois 260
- Financial Services companies in Illinois 248
- Critical infrastructure operators in Illinois 241
- Consulting firms in Illinois 238
- Logistics companies in Illinois 228
- Transportation, Logistics, Supply Chain and Storage companies in Illinois 215
- SaaS companies in Illinois 182
- Family-owned companies in Illinois 167
- Publicly traded companies in Illinois 154
- Public sector organisations in Illinois 147
- Software Development companies in Illinois 142
- Truck Transportation companies in Illinois 142
- Higher Education companies in Illinois 140
- Distributors and wholesalers in Illinois 135
- Construction companies in Illinois 133
The same list elsewhere in United States
- Law firms in the United States 1,066
- Law firms in New York State 190
- Law firms in California 116
- Law firms in Texas 68
- Law firms in Florida 66
- Law firms in Pennsylvania 40
- Law firms in Massachusetts 35
- Law firms in Minnesota 32
- Law firms in Ohio 30
- Law firms in Georgia 26
- Law firms in New Jersey 26
- Law firms in New York 129
- Law firms in Washington 41
- Law firms in Chicago 40
- Law firms in Los Angeles 31