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Encyclopaedia Britannica
The Encyclopaedia Britannica Group is a global knowledge leader whose flagship products—from Encyclopaedia Britannica®, Britannica® Digital Learning, Britannica Knowledge Systems®, Merriam-Webster®, and Melingo®—inspire curiosity and joy of learning on multiple platforms and devices. Encyclopaedia Britannica, founded in Edinburgh, Scotland in 1768, marks its 250th anniversary this year. A pioneer in digital learning since the 1980s, the company today serves the needs of students, lifelong learners, and professionals by providing curriculum products, language-study courses, digital encyclopedias, and professional readiness training through its extensive products.
Chicago, Illinois, US
Private
$89.3M Revenue
http://www.britannica.com
461 Employees
World Book, Inc.
World Book, a subsidiary of Marmon Holdings, Inc, a Berkshire Hathaway company, is based out of our downtown Chicago office. We’re a leading educational publishing and e-learning company that leverages cutting-edge technology to provide authoritative, trustworthy, and understandable content in the school and library and consumer markets worldwide. Our robust product suite includes highly engaging digital databases, eBooks and streaming content, the legendary print encyclopedia, and award-winning nonfiction print books.
Chicago, Illinois, US
Private
$56M Revenue
http://www.worldbook.com
239 Employees
OpenStax, Rice University
OpenStax is on a mission to increase educational access for all. We do this by offering free, peer-reviewed, openly licensed textbooks for introductory college and Advanced Placement® courses, facilitating cutting edge research through the Kinetic platform, and offering the innovative RAISE curriculum for Algebra 1 courses. As part of Rice University, which is a 501(c)(3) nonprofit charitable corporation, we’re committed to helping students access the tools they need to complete their courses and meet their educational goals.
Houston, Texas, US
Non profit
$16.2M Revenue
http://openstax.org
78 Employees
G2 Leader Summer 2026 G2 Best Est ROI Mid-Market Summer 2026 G2 Easiest Admin Mid-Market Summer 2026 G2 Most Implementable Summer 2026 G2 Best Results Mid-Market Summer 2026 G2 Lead Capture Mid-Market Summer 2026 Inc Fastest Growing Private Companies 2026 Inc Best Workplace 2026
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