The media house, best known for publishing the Harry Potter books, said Oberon will be incorporated into its Academic & Professional division and is expected to break even in its first year.
The company expects that the purchase will contribute around £100,000 in revenues for its current financial year, adding that there are also opportunities for “profit enhancements” following the integration of the business.
“The Oberon programme aligns very well with our existing publishing within Methuen Drama”, said Jonathan Glasspool, managing director of Bloomsbury's Academic & Professional division.
“With the combined lists of Oberon, Methuen Drama and The Arden Shakespeare, Bloomsbury is looking forward to developing and diversifying its position as the world's leading international publisher in drama and the performing arts", he added.
Bloomsbury shares were lifted 1.2% to 263p in late-morning trading on Tuesday.