Tesseract Group, Inc. (The). The Tesseract Group, Inc. is an integrated education management company, serving private preschool students, private and public charter elementary, middle and high school students and post-secondary career collage. The company operates 37 school sites in six states serving over 8,000 preschool to post-secondary students. The Tesseract schools operate both private and public charter schools serving preschool through grade 12. The company has also developed a family learning center model. During the school year 1998-1999, the company opened three additional Tesseract private schools. During the third quarter of 2000 the company has plans to sell the Academy of Business College subsidiary. Preschool revenues accounted for 47% of fiscal 1999 revenues; private revenues, 32%; charter revenues, 14% and college revenues, 7%