- JEM MANUFACTURING LTD- 16440210 - Incorporated on 9 May 2025 
- OLDKNOW ACADEMY- 07737582 - Incorporated on 11 August 2011 
- JEMMA LTDDissolved- 08059109 - Dissolved on 7 October 2014 
- JEMMA LTD- 09855189 - Incorporated on 3 November 2015 
- OLDKNOW CONTRACTING LIMITED- 07287188 - Incorporated on 17 June 2010 
- JEMMAT LTDDisolved- 14655986 - Dissolved on 30 May 2023 
- KATIE OLDKNOW LTD- 11334193 - Incorporated on 27 April 2018 
- THE SAMUEL OLDKNOW LTD- 09815086 - Incorporated on 8 October 2015 
- JEMMAOB LTD- 11996649 - Incorporated on 15 May 2019 
- LEWIS J OLDKNOW LIMITED- 15264689 - Incorporated on 6 November 2023 
- JEMMA JANE'S LTDActive - Proposal to Strike off- 08997434 - Incorporated on 15 April 2014 
- JAY & JEMMA LTDActive - Proposal to Strike off- 10980703 - Incorporated on 25 September 2017 
- JEMMALOU LTDLiquidation- 11421651 - Incorporated on 19 June 2018 
- OLDKNOW PROPERTIES LTD- 11522441 - Incorporated on 17 August 2018 
- OLDKNOW ASSOCIATES LIMITED- 05375303 - Incorporated on 24 February 2005 
- OLDKNOW CONSULTING LTDActive - Proposal to Strike off- 08776368 - Incorporated on 15 November 2013 
- JEMMA DYAS LTD- 10107231 - Incorporated on 6 April 2016 
- JEMMA HATT LTD- 11471225 - Incorporated on 18 July 2018 
- JEMMA DALY LTDActive - Proposal to Strike off- 08882804 - Incorporated on 7 February 2014 
- JEMMA READ LTDActive - Proposal to Strike off- 09553502 - Incorporated on 21 April 2015