The story
Study Island was founded in May 2000 by Cam Chalmers and Dave Muzzo, originally providing tools related to the Ohio Proficiency Test Program. By 2002, Study Island had expanded to four states, Ohio, North Carolina, New York, and Michigan, and serviced 180 schools. Continuing its rapid growth plan, Study Island, which moved its offices to Dallas, Texas added six states in 2003 and expanded its coverage to 750 schools.
In January 2007, Providence Equity Partners and MHT Partners together with co-founders Cameron Chalmers and David Muzzo completed a recapitalization of Study Island in which Archipelago Learning was created to acquire 100% of the outstanding shares of Study Island.
In October 2009, it launched in Canada.
In November 2009, Archipelago Learning launched a $75 million initial public offering on the NASDAQ under the symbol "ARCL". It also sold TeacherWeb in November 2009.
In June 2010, it bought EducationCity expanding the company's school count and portfolio of products in the United States and providing an entry point into the U.K. The company entered into a distribution agreement with Blake Publishing to distribute Reading Eggs in the United States and Canada.
In 2011, they acquired Alloy Multimedia, the publisher of ESL ReadingSmart, an English language learning program.
On 17 May 2012, Archipelago Learning was purchased by PLATO Learning (Now Edmentum, Inc) at the price of US$11.10 per share.
From Wikipedia’s article on Edmentum, shared under CC BY-SA 4.0.4