* Vodafone Iceland (telecommunications operator)
* 365 (media company)
* Sena (content owner and movie theatre operator)
* Wyndeham Press (UK based printing company)
* The Icelandic franchise of the Securitas security company
* Vodafone Faroe Islands (telecommunications operator on Faroe Islands)
* Kögun (Software and IT services corporation)
Dagsbrún (then called Og fjarskipti) was formed in 2003 through a merger of Íslandssími, Tal and Halló! (all telephone companies).
During 2004 and early 2005, Og fjarskipti grew further by acquiring the two largest Icelandic ISP's, Margmiðlun hf. and Lína.Net hf., as well as most of the Icelandic media company Norðurljós, making it the largest corporate network provider in Iceland, offering mobile and fixed telephony and high-quality data networking, with a large footprint in the residential broadband and TV market.
As of March, 2006 Dagsbrun owned "...television and radio stations, a newspaper and a telecommunications company in Iceland and the Faroe Islands" , and its Wyndeham stake marked the first time it has showed interest for acquisition outside of its home market .
The parent company of the mass media companies was formerly Norðurljós. Today's parent company is called 365 and has split its media companies into two subsidiaries, 365 ljósvakamiðlar and 365 prentmiðlar, each with a specialized focus. In 2005 the name of Og fjarskipti changed to Dagsbrún.