These online-only businesses in Illinois are primarily headquartered in Chicago, representing a mix of established companies and those founded in the 2000s and 2010s. The sector focus is broad, encompassing technology, retail, education, and financial services. Many leverage digital platforms to deliver their core offerings.
Key companies include Groupon, an experiences marketplace; Wyzant, which connects individuals with tutors; Restaurant.com, a platform for local dining deals; and Kaplan University, offering online higher education. Other notable firms are Factor_, providing chef-prepared meals, and FanSided, a network of fandom-focused sports and entertainment sites.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Grouponjob-boards.eu.greenhouse.io
An experiences marketplace offering local deals, live events, and travel options, helping people discover new experiences while assisting businesses in growing |
10,452 | |||
| 2 |
Wyzantwyzant.com
Connecting individuals with over 80,000 tutors in 300+ subjects for tailored 1-to-1 lessons to help achieve academic and career goals |
3,698 | |||
| 3 |
Restaurant.comrestaurant.com
A trusted source connecting diners with local restaurants, offering savings, digital marketing services, and cost-effective gift certificate solutions to drive revenue |
3,328 | |||
| 4 |
Kaplan Universitypurdueglobal.edu
A regionally accredited university providing flexible higher education options for adult students, offering online programs and master's degrees Acquired by Purdue University |
2,770 | |||
| 5 |
Factor_factor75.com
This company offers no-nonsense, chef-prepared meals made with ingredients of integrity, expert-approved nutrition, and restaurant-quality cuisine for people on the go |
1,140 | |||
| 6 |
FanSidedfansided.com
FanSided is a rapidly growing network of fandom-focused sports, entertainment, and lifestyle sites with over 300 communities connecting passionate fans |
928 | |||
| 7 | 807 | ||||
| 8 |
NOCDtreatmyocd.com
Telehealth provider specializing in OCD treatment through live video therapy sessions with licensed therapists, self-help tools, and peer communities for support |
796 | |||
| 9 |
Kin Insurancekin.com
A home insurance company utilizing vast property data to provide customized coverage at low prices through a user-friendly online platform |
707 | |||
| 10 |
HomeSchoolingalquranhome.com
An online educational institute for teaching the Holy Quran, offering one-to-one learning with qualified teachers, hi-tech facilities, and flexible scheduling options |
639 | |||
| 11 |
Forex Trading Unlocked Inc.forex-trading-unlocked.com
An online trading hub providing daily content and resources for Forex, Futures, Stocks, Options, Cryptocurrencies, and Binary Options traders worldwide No membership or login required |
601 | |||
| 12 |
LTD Commoditiesltdcommodities.com
A leading eCommerce and catalog retailer offering top-quality merchandise at great value, including fashion, home goods, gifts, and toys |
582 | |||
| 13 |
Vivid Seatsvividseats.com
An online ticket marketplace based in Chicago, dedicated to connecting fans with live events, artists, and teams across North America |
521 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 14 |
NinjaTraderninjatrader.com
Industry-leading trading platform and futures broker with a flagship product offering advanced charting, market analytics, trading system development, trade simulation, and real-time data feeds |
520 | |||
| 15 |
Braintreepaypal.com
A global leader in mobile payments, providing commerce tools for merchants to accept payments in multiple currencies and methods securely |
232 | |||
| 16 |
PersonalizationMall.compersonalizationmall.com
A provider of customizable keepsake items with industry-leading personalization techniques, part of a family of brands offering everyday gifting products |
219 | |||
| 17 |
Honeycomb Insurancehoneycombinsurance.com
This company offers customized insurance policies for real estate properties using AI and computer vision, providing unbeatable rates with a transparent digital platform |
202 | |||
| 18 |
Hostwayhostway.com
The company supports innovators and entrepreneurs in achieving online success, aiming to improve the web environment collaboratively |
202 | |||
| 19 |
Jungle Scoutjunglescout.com
A leading platform for selling on Amazon, providing business management solutions and market intelligence resources to help entrepreneurs achieve success |
161 | |||
| 20 |
OpticsPlanet, Inc.opticsplanet.com
Specializing in technical gear, OpticsPlanet offers a vast selection of high-performance products from top brands, exceptional customer service, and knowledgeable team members |
131 | |||
| 21 |
One Step Aheadwards.com
An online and catalog retailer specializing in problem-solving products for babies, children, and parents, with a focus on research, testing, and customer feedback |
82 | |||
| 22 |
Alice & Wonderaliceandwonder.com
Online shop curating affordable and stylish clothing, accessories, and home decor for the everyday woman, focusing on mixing and matching to create unique looks |
64 | |||
| 23 | 22 | ||||
| 24 |
BayRu, LLCgodaddy.com
US-Russia ecommerce specialist for drop shipping, parcel shipping, and marketing services, connecting American sellers to Russian/CIS consumers with efficient delivery and competitive prices |
22 | |||
| 25 |
StaalXstaalx.com
Online platform connecting buyers and sellers, offering diverse listings, quick payments, and secure, fast product delivery for commercial transactions. |
9 | |||
| 26 |
Go Customgocustom.com
An e-commerce company specializing in digital design and custom printing of apparel, such as t-shirts and hoodies, based on customer preferences |
5 | |||
| 27 |
Arbithubarbithub.com
E-commerce tool providing data-driven support to Amazon sellers in North America, specializing in online arbitrage opportunities for reselling success |
2 | |||
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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 11, 2026.
More company lists in Illinois
- The largest companies in Illinois 4,687
- Multinational companies in Illinois 831
- Manufacturers in Illinois 528
- Education providers in Illinois 370
- Financial services firms in Illinois 352
- Professional services firms in Illinois 339
- Companies with in-house R&D in Illinois 322
- 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 274
- 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
- Companies with a mobile app in Illinois 178
- Family-owned companies in Illinois 166
- Subscription businesses in Illinois 160
- Corporate groups and holding companies in Illinois 154
- Publicly traded companies in Illinois 154
The same list elsewhere in United States
- Online-only businesses in the United States 868
- Online-only businesses in California 258
- Online-only businesses in New York State 165
- Online-only businesses in Florida 48
- Online-only businesses in Texas 44
- Online-only businesses in New York 138
- Online-only businesses in San Francisco 95
- Online-only businesses in Los Angeles 48