# Top 33 private equity-backed companies in Illinois
Tamtam tracks 33 private equity-backed companies headquartered in Illinois. This list ranks all of them by number of employees on LinkedIn, led by Walgreens, HUB International and Baker Tilly US. Their median headcount is 497. Half of them were founded in 2000 or later. The most common headquarters are Chicago (18), Oak Brook (3) and Rolling Meadows (2).
These are private equity-backed companies in Illinois, mostly large and mid-sized firms. The list includes businesses like Walgreens, a retail pharmacy chain, HUB International, an insurance advisor, and Baker Tilly US, an advisory CPA firm. Other notable companies are HAVI, a global supply chain solutions provider, and Cision, specializing in media intelligence. Many of these firms are headquartered in Chicago.
The companies here show a concentration in professional services, with several in insurance, accounting, and business consulting. For instance, AssuredPartners is a global insurance brokerage, and Sikich offers technology solutions and financial services. There is also a significant presence of software development companies, such as Applied Systems, which provides cloud software for the insurance industry, and Relativity, a SaaS product for data organization.
๐บ๐ธ Illinois ยท 33 companies ยท Updated Nov 15, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Walgreens](https://www.tamtam.ai/c/walgreens) (walgreens.com)
A leading retail pharmacy offering health and beauty products, with a focus on providing pharmacy services and a seamless omnichannel experience for customers | Retail Pharmacies | ๐บ๐ธ Deerfield | 90,723 | 1901 |
| 2 | [HUB International](https://www.tamtam.ai/c/hub-international) (hubinternational.com)
Advises businesses and individuals on insurance, risk management, employee benefits, retirement, and wealth management with tailored solutions. | Insurance | ๐บ๐ธ Chicago | 16,129 | |
| 3 | [Baker Tilly US](https://www.tamtam.ai/c/baker-tilly-us) (bakertilly.com)
A leading advisory CPA firm with a coast-to-coast and global presence, part of Baker Tilly International network with 43,000 professionals | Accounting | ๐บ๐ธ Chicago | 10,594 | |
| 4 | [HAVI](https://www.tamtam.ai/c/havi) (havi.com)
A global company providing sourcing, supply chain solutions, digital analytics, marketing services, and consumer products to connect people with their favorite products worldwide | Holding Companies | ๐บ๐ธ Chicago | 4,160 | 1974 |
| 5 | [Cision](https://www.tamtam.ai/c/cision) (cision.com)
A global leader in media intelligence and communication solutions, equipping professionals with tools to excel in today's data-driven world | Public Relations and Communications Services | ๐บ๐ธ Chicago | 3,839 | |
| 6 | [AssuredPartners](https://www.tamtam.ai/c/assuredpartners) (ajg.com)
Global insurance brokerage specializing in industry-specific solutions for businesses and consumers, offering services in commercial insurance, risk management, and employee benefits | Insurance | ๐บ๐ธ Rolling Meadows | 3,075 | 2011 |
| 7 | [AIT Worldwide Logistics](https://www.tamtam.ai/c/ait-worldwide-logistics) (aitworldwide.com)
Global freight forwarding company offering customized supply chain solutions including sea, air, ground, rail transport, customs clearance, and warehousing. | Transportation, Logistics, Supply Chain and Storage | ๐บ๐ธ Itasca | 2,822 | 1979 |
| 8 | [Applied Systems](https://www.tamtam.ai/c/applied-systems) (www1.appliedsystems.com)
A leading provider of innovative cloud software for the insurance industry, driving transformation through digitization, automation, and new partnerships | Software Development | ๐บ๐ธ Chicago | 2,813 | 1983 |
| 9 | [Chamberlain Group](https://www.tamtam.ai/c/chamberlain-group) (chamberlaingroup.com)
A global leader in intelligent access technology, providing seamless, secure access to homes and businesses through innovative products and software solutions | Software Development | ๐บ๐ธ Oak Brook | 2,781 | 1954 |
| 10 | [Sikich](https://www.tamtam.ai/c/sikich) (sikich.com)
A global professional services company specializing in technology solutions, delivering transformative digital strategies and financial services to various clients worldwide | Business Consulting and Services | ๐บ๐ธ Chicago | 2,335 | 1982 |
| 11 | [Relativity](https://www.tamtam.ai/c/relativity) (relativity.com)
A software company offering RelativityOne, a SaaS product for data organization, truth discovery, and action during litigation and investigations in various sectors globally | Software Development | ๐บ๐ธ Chicago | 1,856 | |
| 12 | [Navigant](https://www.tamtam.ai/c/navigant) (guidehouse.com)
Global provider of management technology and risk consulting services helping public and commercial clients address transformational change technology innovation and regulatory pressure | Business Consulting and Services | ๐บ๐ธ Chicago | 1,505 | |
| 13 | [Tropicana Brands Group](https://www.tamtam.ai/c/tropicana-brands-group) (tropicanabrandsgroup.com)
manages a global portfolio of iconic juice brands, focusing on innovation, manufacturing, distribution, sales, marketing, and nutrition expertise | Food and Beverage Services | ๐บ๐ธ Chicago | 1,253 | 2022 |
| 14 | [A. M. Castle & Co.](https://www.tamtam.ai/c/a-m-castle-and-co) (amcastle.com)
Global supplier and processor of specialty metals serving aerospace, defense, industrial, and medical markets with quality and reliability. | Mining | ๐บ๐ธ Oak Brook | 861 | 1890 |
| 15 | [Revantage, A Blackstone Portfolio Company](https://www.tamtam.ai/c/revantage-a-blackstone-portfolio-company) (revantage.com)
A global leader in corporate services catering to Blackstone Real Estate portfolio companies and investments worldwide | Real Estate | ๐บ๐ธ Chicago | 666 | 2017 |
| 16 | [International Equipment Solutions](https://www.tamtam.ai/c/international-equipment-solutions) (industrialtoolsandattachments.com)
A global engineered equipment company focused on providing strong value propositions, outstanding customer service, and long-term growth strategies across domestic and international markets | Machinery Manufacturing | ๐บ๐ธ Oak Brook | 559 | 2011 |
| 17 | [Equity Office Properties](https://www.tamtam.ai/c/equity-office-properties) (equityoffice.com)
Private equity-owned portfolio of premier office buildings in major US markets, managing assets for investor returns and customer satisfaction Headquarters in Chicago | Commercial Real Estate | ๐บ๐ธ Chicago | 497 | |
| 18 | [Experity](https://www.tamtam.ai/c/experity) (experityhealth.com)
A leading software company for on-demand healthcare in the US urgent care market, offering integrated solutions to streamline operations and optimize revenue | Software Development | ๐บ๐ธ Machesney Park | 474 | |
| 19 | [PPC Flex](https://www.tamtam.ai/c/ppc-flex) (ppcflex.com)
Leader in cleanroom and consumer packaging for various industries, specializing in printed, laminated, and stand up pouch designs with exceptional speed to market and quality service | Packaging and Containers Manufacturing | ๐บ๐ธ Buffalo Grove | 424 | |
| 20 | [SDI Presence](https://www.tamtam.ai/c/sdi-presence) (sdipresence.com)
IT consultancy and managed services provider offering strategic services, IT consulting, and hybrid multicloud infrastructure solutions to optimize technology environments for various industries | IT Services and IT Consulting | ๐บ๐ธ Chicago | 411 | 2016 |
| 21 | [Northstar Aerospace](https://www.tamtam.ai/c/northstar-aerospace) (nsaero.com)
Leading manufacturer of aerospace components and assemblies, specializing in gears, transmissions, and rotorcraft drive systems Also provides maintenance and repair services | Aviation and Aerospace Component Manufacturing | ๐บ๐ธ Bedford Park | 361 | 2000 |
| 22 | [SmartSource Technical Solutions](https://www.tamtam.ai/c/smartsource-technical-solutions) (servicepoint.com)
SmartSource offers IT staffing, multi-site deployment, technical solutions, and international services to businesses, VARs, OEMs, and global partners worldwide | IT Services and IT Consulting | ๐บ๐ธ St. Charles | 313 | 1996 |
| 23 | [LivCor, a Blackstone Portfolio Company](https://www.tamtam.ai/c/livcor-a-blackstone-portfolio-company) (livcor.com)
A real estate company specializing in multi-family housing with a portfolio of over 400 properties totaling more than 150,000 units across the United States | Real Estate | ๐บ๐ธ Chicago | 290 | 2013 |
| 24 | [GoodVets](https://www.tamtam.ai/c/goodvets) (goodvets.com)
GoodVets is a veterinary care platform partnering with veterinarians to operate state-of-the-art facilities and provide exceptional healthcare for pets | Veterinary Services | ๐บ๐ธ Chicago | 267 | 2017 |
| 25 | [Valutech Outsourcing](https://www.tamtam.ai/c/valutech-outsourcing) (reconext.com)
Valutech has merged with Reconext Follow Reconext for updates on the latest developments in technology and solutions | Computers and Electronics Manufacturing | ๐บ๐ธ Hoffman Estates | 263 | |
| 26 | [Valto Engineered Materials](https://www.tamtam.ai/c/valto-engineered-materials) (cranecomposites.com)
A world-leading provider of fiber-reinforced composite materials, specializing in innovative, lightweight products that outperform traditional metals and woods since 1954 | Plastics Manufacturing | ๐บ๐ธ Channahon | 261 | 1954 |
| 27 | [Renaissance](https://www.tamtam.ai/c/renaissance) (renaissanceins.com)
Specializing in innovative technology and services, we help insurance agencies achieve organic and profitable growth | Insurance | ๐บ๐ธ Chicago | 255 | 2000 |
| 28 | [Icon](https://www.tamtam.ai/c/icon-rolling-meadows) (stratusunlimited.com)
A leading brand implementation company formed from a merger, focused on making a positive impact for clients and the world | Strategic Management Services | ๐บ๐ธ Rolling Meadows | 246 | 1931 |
| 29 | [Buske Logistics](https://www.tamtam.ai/c/buske-logistics) (buske.com)
A global logistics company providing best-in-class services to fortune 500 clients in the US, Canada, and Mexico, with a focus on personal attention and cutting-edge technology | Transportation, Logistics, Supply Chain and Storage | ๐บ๐ธ Edwardsville | 227 | 1923 |
| 30 | [Kensing](https://www.tamtam.ai/c/kensing) (kensingsolutions.com)
The company specializes in producing premium quality sterols, natural vitamin E, anionic surfactants, and esters using pure ingredients while focusing on sustainability and innovation | Chemical Manufacturing | ๐บ๐ธ Kankakee | 216 | 2021 |
| 31 | [1WorldSync Content Solutions, by Syndigo](https://www.tamtam.ai/c/1worldsync-content-solutions-by-syndigo) (1worldsync.com)
A leading provider of product content solutions, enabling global companies to share trusted information, empowering intelligent purchase decisions through a technology platform | IT Services and IT Consulting | ๐บ๐ธ Chicago | 103 | 2012 |
| 32 | [GlobalView](https://www.tamtam.ai/c/globalview) (enverus.com)
A leading energy industry data and software company offering innovative technologies, predictive analytics, and collaborative solutions to global customers | Software Development | ๐บ๐ธ Chicago | 39 | 1996 |
| 33 | [Prime TSR](https://www.tamtam.ai/c/prime-tsr) (onec1.com)
Technology modernization consultancy creating custom solutions for organizations to manage the past, navigate the present, and plan for the future in ever-evolving landscapes | IT Services and IT Consulting | ๐บ๐ธ Chicago | 6 | 2013 |
## 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 15, 2026.
## More company lists in Illinois
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- [Multinational companies in Illinois](https://www.tamtam.ai/l/multinational-companies-illinois) (830)
- [Manufacturers in Illinois](https://www.tamtam.ai/l/manufacturers-illinois) (528)
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- [Family-owned companies in Illinois](https://www.tamtam.ai/l/family-owned-companies-illinois) (166)
- [Subscription businesses in Illinois](https://www.tamtam.ai/l/subscription-businesses-illinois) (160)
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## The same list elsewhere in United States
- [Private equity-backed companies in the United States](https://www.tamtam.ai/l/private-equity-backed-companies-united-states) (579)
- [Private equity-backed companies in Texas](https://www.tamtam.ai/l/private-equity-backed-companies-texas) (75)
- [Private equity-backed companies in California](https://www.tamtam.ai/l/private-equity-backed-companies-california) (72)
- [Private equity-backed companies in New York State](https://www.tamtam.ai/l/private-equity-backed-companies-new-york-state) (45)
- [Private equity-backed companies in Florida](https://www.tamtam.ai/l/private-equity-backed-companies-florida) (44)
- [Private equity-backed companies in Massachusetts](https://www.tamtam.ai/l/private-equity-backed-companies-massachusetts) (29)
- [Private equity-backed companies in North Carolina](https://www.tamtam.ai/l/private-equity-backed-companies-north-carolina) (25)
- [Private equity-backed companies in New York](https://www.tamtam.ai/l/private-equity-backed-companies-new-york) (39)
## The same list elsewhere
- [Private equity-backed companies in the world](https://www.tamtam.ai/l/private-equity-backed-companies-in-the-world) (1,497)
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Source: https://www.tamtam.ai/l/private-equity-backed-companies-illinois