- Active Math Workshops
 - Northbrook - American Collegiate Adventures
- Northbrook - Offers summer pre-college enrichment programmes in Wisconsin, Spain, and Italy designed to give high school students a taste of college life.
- Enterprise Recovery Systems, Inc.
- Oak Brook - Collection agency specialising in educational account collections.
- Film Ideas Inc.
- Northbrook - Worldwide distributor and producer of educational videos for schools, universities, libraries, and more.
- Flinn Scientific, Inc.
- Batavia - Sells products and resources for teaching science, specialising in chemistry, lab safety and biology.
- Hemisphere Educational Tours
- Prospect Heights - Focuses on educational student tours across the United States and beyond.
- InterCall
- Chicago - Offers network enabled learning management systems for distance training, elearning, and online teaching. Provides web/internet and data based conferencing.
- Paradigm Training Systems
- Aurora - Training of trainers and instructor-trainers.
- Resources for Staff & Organization Development
- Wheaton - Information on mentoring new teachers, staff development, peer coaching, and performance assessment.
- Riverside Publishing
- Itasca - Offers testing products for K-12 assessments and special needs. Career planning and guidance information.
- Sargent-Welch
- Buffalo Grove - Distributes K-14 science education supplies.
- School Service, Inc.
- Grayslake - Specialises in printed school forms. Also sells educational videos, software and resource books.
- School Tool Box Program, The
- Sycamore - Offers school supplies in pre-packaged kits. Features custom-developed supply kits for schools, in addition to fundraising opportunities.
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