Irish IT services group PFH has bought Redstone Technology from its UK parent company for €2.5m.
Redstone, which employs 55 people, provides business storage and server technology to a number of public and private sector customers.
PFH says the enlarged group will employ around 235 people and have annual revenues of more than €55m.
PFH chief executive Paul Hourican said the deal would boost its presence in the greater Dublin and Leinster areas, as well as bringing the company into Northern Ireland for the first time.
The Redstone deal is PFH's second big buy this year after its acquisition of Siemens Enterprise Communications in May.
Meanwhile, Dermot Desmond's IIU and Bank of Ireland's Kernel Capital have invested €2m in Irish semiconductor firm DecaWave Limited. DecaWave is a Dublin-based company making components for wireless sensors used mostly for locating and tracking people and things.