| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| SOUTHERNDOWN LIMITED | SC537634 | 09/06/2016 | Dissolved |
| SUTHERLAND SPACEPORT LTD. | SC682509 | 27/04/2023 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| A1 PRESENTATIONS LIMITED | 02518569 | 30/11/2018 | 18/04/2019 | Dissolved |
| BESWICK RELOCATION SERVICES LIMITED | 04128108 | 20/12/2000 | 06/06/2009 | Silver |
| COEX LIMITED | 01911754 | 30/11/2018 | 18/04/2019 | Not Trading |
| FALCON EQUIPMENT AND SYSTEMS LIMITED | 04244450 | 30/11/2018 | 18/04/2019 | Dissolved |
| FOTOVALUE LIMITED | 00530172 | 30/11/2018 | 18/04/2019 | Not Trading |
| GENERAL OCEANS UK HOLDINGS LTD | SC308386 | 01/10/2008 | 10/10/2014 | Gold |
| IES INTEGRATED ELECTRONIC SYSTEMS LIMITED | 02244816 | 30/11/2018 | 18/04/2019 | Dissolved |
| INTEGRATED ENVIRONMENTAL SYSTEMS LIMITED | 02427589 | 30/11/2018 | 18/04/2019 | Dissolved |
| LOOK CCTV LIMITED | 02126939 | 30/11/2018 | 18/04/2019 | Not Trading |
| LOOK CLOSED CIRCUIT T.V LIMITED | 02473984 | 30/11/2018 | 18/04/2019 | Not Trading |
| OCULAR INTEGRATION LIMITED | 05831231 | 30/11/2018 | 18/04/2019 | Gold |
| PROTEC 2001 LIMITED | 02173302 | 30/11/2018 | 18/04/2019 | Dissolved |
| PROTEC LIMITED | 02876304 | 30/11/2018 | 18/04/2019 | Not Trading |
| QUADNETICS EMPLOYEES' TRUSTEES LIMITED | 02128906 | 30/11/2018 | 18/04/2019 | Not Trading |
| QUADNETICS GROUP LIMITED | 04283903 | 30/11/2018 | 18/04/2019 | Not Trading |
| QUADNETICS SIP TRUSTEES LIMITED | 05815275 | 30/11/2018 | 18/04/2019 | Not Trading |
| QUADRANT INTEGRATED SYSTEMS LIMITED | 02583461 | 30/11/2018 | 18/04/2019 | Dissolved |
| QUADRANT RESEARCH & DEVELOPMENT LIMITED | 02673950 | 30/11/2018 | 18/04/2019 | Not Trading |
| QUADRANT SUPPORT SERVICES LIMITED | 04329446 | 30/11/2018 | 18/04/2019 | Dissolved |
| QUADRANT VIDEO SYSTEMS LIMITED | 02127345 | 30/11/2018 | 18/04/2019 | Dissolved |
| S D A PROTEC LIMITED | 02011062 | 30/11/2018 | 18/04/2019 | Dissolved |
| SANPHO PENSION TRUSTEES LIMITED | 01530978 | 30/11/2018 | 18/04/2019 | Not Trading |
| SDA NETWORK SOLUTIONS LIMITED | 04471801 | 30/11/2018 | 18/04/2019 | Dissolved |
| SDA PROTEC (2001) LIMITED | 02787012 | 30/11/2018 | 18/04/2019 | Dissolved |
| SECTRONIC (MARKETING) LIMITED | 01364510 | 30/11/2018 | 18/04/2019 | Dissolved |
| SECURITY DESIGN ASSOCIATES (1979) LIMITED | SC069292 | 30/11/2018 | 18/04/2019 | Dissolved |
| SMITH FLOW CONTROL LIMITED | 01956503 | 18/11/2008 | 24/09/2009 | Not Trading |
| SMITH FLOW CONTROL LIMITED | 01956503 | 18/11/2008 | 27/07/2012 | Not Trading |
| SOFTWARE DEVELOPMENTS (DIGITAL DIRECT) LIMITED | 02616444 | 30/11/2018 | 18/04/2019 | Dissolved |
| STANMORE SYSTEMS LTD | 02144288 | 30/11/2018 | 18/04/2019 | Not Trading |
| SYNECTIC SYSTEMS GROUP LIMITED | 05815524 | 30/11/2018 | 18/04/2019 | Gold |
| SYNECTIC SYSTEMS LIMITED | 02191834 | 30/11/2018 | 18/04/2019 | Not Trading |
| SYNECTICS EFX LIMITED | 11734200 | 19/12/2018 | 18/04/2019 | Silver |
| SYNECTICS MOBILE SYSTEMS LIMITED | 05822491 | 20/12/2018 | 18/04/2019 | Not Trading |
| SYNECTICS NO. 2 LIMITED | 07103133 | 30/11/2018 | 18/04/2019 | Not Trading |
| SYNECTICS PLC | 01740011 | 30/11/2018 | 18/04/2019 | Gold |
| SYNECTICS SECURITY NETWORKS LIMITED | 03014280 | 30/11/2018 | 18/04/2019 | Not Trading |
| SYNECTICS TECHNOLOGY CENTRE LIMITED | 02192181 | 30/11/2018 | 18/04/2019 | Not Trading |
| TRITECH INTERNATIONAL LIMITED | SC085501 | 21/08/2007 | 10/10/2014 | Gold |
| ULVERTECH ENGINEERING LIMITED | 04737644 | 18/11/2008 | 03/04/2010 | Dissolved |
| ULVERTECH ENGINEERING LIMITED | 04737644 | 18/11/2008 | 27/07/2012 | Dissolved |