Based in Santa Clara, Calif., Chegg Inc. was founded in 2005 as a textbook rental business, its name a combination of “chicken” and “egg.”

Chegg went public in 2013 with a $187.5 million initial public offering. Some 400 of its 700 employees are based in the United States. The company reported revenue of $255.6 million in 2013. Chegg has been on an acquisition spree as it shifts its business model away from renting physical books. In June it spent $30 million for InstaEDU, which pairs students with on-demand tutors.