| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AMACIS HOLDINGS LIMITED | NI035503 | 18/02/2000 | Dissolved |
| BELFAST BOYS MODEL BURSARY FUND (IN MEMORY OF EW DAVIS) | NI630824 | 21/04/2015 | Silver |
| Investment Belfast Ltd | NI034285 | 29/04/1999 | Dissolved |
| Lumio Ltd | NI035344 | 31/05/2000 | Dissolved |
| NORTHERN IRELAND SCIENCE PARK (HOLDINGS) LIMITED | NI039294 | 10/03/2017 | Amber |
| NORTHERN IRELAND SCIENCE PARK FOUNDATION LIMITED | NI035856 | 10/03/2017 | Gold |
| NORTHERN IRELAND SCIENCE PARK PROPERTY LIMITED | NI038987 | 10/03/2017 | Amber |
| Thorndale Trading Ltd | NI069504 | 01/08/2008 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ANDOR TECHNOLOGY LIMITED | NI022466 | 28/02/2000 | 10/02/2010 | Silver |
| AXIS THREE LIMITED | NI042518 | 08/02/2007 | 31/10/2012 | Dissolved |
| AXIS THREE LIMITED | NI042518 | 17/02/2003 | 29/10/2012 | Dissolved |
| Amacis Group Ltd | NI045134 | 01/04/2003 | 22/12/2003 | Dissolved |
| Amphion Semiconductor (Asia) Ltd | NI036792 | 21/09/1999 | 29/06/2004 | Dissolved |
| BIZNET SOLUTIONS LTD | NI039404 | 11/11/2009 | 30/11/2010 | Bronze |
| EBLANA ENTERPRISE GROUP (NI) LIMITED | NI032815 | 31/07/1998 | 16/05/2001 | One Red Flag |
| EXPLORISTICS LTD | NI072009 | 14/03/2016 | 31/08/2018 | Amber |
| GINNLEAR HOLDINGS LIMITED | NI637951 | 01/05/2016 | 01/05/2023 | Bronze |
| JAMES LECKEY DESIGN LIMITED | NI023037 | 01/01/2013 | 31/03/2014 | Bronze |
| LEARNING POOL LIMITED | NI060102 | 01/08/2014 | 01/05/2016 | Silver |
| NORTH WEST REGIONAL SCIENCE PARK LIMITED | NI614527 | 10/03/2017 | 10/03/2017 | Bronze |
| PROOFPOINT NI LIMITED | NI050867 | 06/02/2007 | 05/04/2013 | Bronze |
| PROOFPOINT NI LIMITED | NI050867 | 22/06/2006 | 05/04/2013 | Bronze |
| QUBIS LIMITED | NI017859 | 30/10/2001 | 20/01/2009 | Silver |
| UNITE SOLUTIONS LIMITED | NI029075 | 03/04/2000 | 30/04/2001 | Dissolved |
| XILINX NI LIMITED | NI066402 | 01/05/2008 | 18/02/2011 | Gold |