The Graduate School of the Ateneo de Manila was first established in 1948, with Master of Arts programs in Education and English as its initial offerings. Over time, other fields of study were introduced, among them Sociology, Economics, Philosophy, and Business Administration.
As its offerings grew in size and complexity, the Graduate School eventually found it necessary to split into two separate entities, and in 1960 the Graduate School of Arts and Sciences, and the Graduate School of Economics and Business Administration were born.
The Graduate School of Economics and Business Administration initially offered only two part-time evening programs: a Master of Arts in Economics, and a Master in Business Administration. A full-time MBA was added to its program portfolio in 1964. Two years later, the Master of Arts in Economics was transferred to the Graduate School of Arts and Sciences, and the school was reorganized into the present-day Ateneo Graduate School of Business, or AGSB.