OpenStax’s market share in the college textbook market continues to grow rapidly. According to the latest Babson Survey Research Group Report on Open Educational Resources (OER), 16.5% of faculty who recently chose a new textbook for a large-enrollment introductory-level course adopted a textbook from OpenStax. This is up 50% over 2016’s adoption rate of 10.8%. The survey finds that OpenStax textbooks are being adopted for large-enrollment introductory courses at roughly the same rate as commercial textbooks.