- FRANCIS RAMSAY- SL000260 - Incorporated on 13 September 1978 
- INTERFLEX SCOTLAND LIMITED- SC009850 - Incorporated on 2 May 1917 
- O'NEILL CARPENTRY LIMITED- 14926852 - Incorporated on 9 June 2023 
- O'NEILL SOFTWARE LTD- 15179199 - Incorporated on 1 October 2023 
- O'NEILL DEVELOPMENTS LIMITEDActive - Proposal to Strike off- 15616044 - Incorporated on 4 April 2024 
- O'NEILL & BRAMWELL LIMITEDDissolved- 03926255 - Dissolved on 25 February 2017 
- LIAM O'NEILL LIMITED- NI047437 - Incorporated on 6 August 2003 
- RUSSELL O'NEILL LIMITED- 04670137 - Incorporated on 19 February 2003 
- CANNING O'NEILL LIMITED- 04706400 - Incorporated on 21 March 2003 
- DAVID O'NEILL LIMITEDLiquidation- 05042941 - Incorporated on 12 February 2004 
- O'NEILL JOINERY LTD- 06190298 - Incorporated on 28 March 2007 
- O'NEILL BUILDERS LIMITEDDissolved- 06318866 - Dissolved on 4 May 2010 
- O'NEILL HOLDINGS LIMITED- 02813407 - Incorporated on 28 April 1993 
- O'NEILL ASSOCIATES LIMITED- 03242143 - Incorporated on 27 August 1996 
- O'NEILL WETSUITS LIMITED- 03803234 - Incorporated on 8 July 1999 
- PATRICIA O'NEILL LIMITEDActive - Proposal to Strike off- 07730198 - Incorporated on 5 August 2011 
- MAUREEN O'NEILL LIMITED- 08204571 - Incorporated on 6 September 2012 
- THOMAS O'NEILL LIMITEDLiquidation- 07137634 - Incorporated on 27 January 2010 
- O'NEILL CONSTRUCTION LIMITEDLiquidation- 07823915 - Incorporated on 26 October 2011 
- O'NEILL MANAGEMENT LIMITEDActive - Proposal to Strike off- 07003388 - Incorporated on 27 August 2009