The decision effectively ends a five-month battle between Euronext and Nasdaq for ownership of the Norwegian stock market operator.
While Euronext has already secured a stake of more than 50% in Oslo Bors, Nasdaq had argued that no takeover should be allowed unless a two-thirds stake was obtained.
No such restrictions will be imposed, the Norwegian ministry said in a statement.
(Reporting by Terje Solsvik; Editing by Simon Cameron-Moore)