Graham Holdings Co
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A diversified holding company, Graham Holdings runs businesses in education, television broadcasting, healthcare, and manufacturing. Its best-known arm is Kaplan, which offers test prep and higher-education services to over a million students. The company traces its roots to the Washington Post newspaper, founded in 1877, and took its current name after selling the paper in 2013. Its namesake Kaplan began in 1938 in the basement of founder Stanley Kaplan's parents' Brooklyn home.