| RADIOREKLAME A/S CVR 11522580 | BoardBoard of Directors | 1987 – 1989 | — | Opløst |
| R.K. HOLDING ApS CVR 18915774 | BoardBoard of Directors | 2008 – 2009 | — | Opløst |
| 3DUNIVERS v/Jack Fridthjof, Ulrik Merrild og Inge Bak CVR 25820177 | OtherStakeholder | 2000 – 2002 | — | Aktiv |
| 3DUNIVERS.DK ApS CVR 26832128 | OtherFounder | 2002 – 2017 | — | Opløst |
| ApS AF 31. AUGUST 2013 CVR 27007600 | BoardBoard of Directors | 2002 – 2016 | — | Opløst |
| JACK FRIDTHJOF HOLDING ApS CVR 27160506 | OtherFounder | 2003 – 2018 | — | Opløst |
| INVISIBLEGAME.COM ApS CVR 29144494 | BoardBoard of Directors | 2005 – 2007 | — | Opløst |
| SEE.MI.COM ApS CVR 29600546 | ManagementManagement | 2010 – 2012 | — | Opløst |
| HOTEL PLESNER A/S CVR 29774587 | BoardBoard of Directors | 2008 – 2009 | — | Opløst |
| HOTEL OASIA A/S CVR 30207998 | BoardBoard of Directors | 2008 – 2009 | — | Opløst |
| LINKAIDERS APS CVR 36503874 | BoardBoard of Directors | 2017 – 2019 | — | Opløst |
| ROHDE ÅRHUS A/S CVR 76713413 | BoardBoard of Directors | 2008 – 2009 | — | Opløst |
| FRIDTHJOF FILM ApS CVR 25461142 | BoardBoard of Directors | 2021 – 2021 | — | Aktiv |
