- SL028977 LP- SL028977 - Incorporated on 2 November 2016 
- SEVEN EIGHTEEN LIMITED- 13334171 - Incorporated on 14 April 2021 
- ION LIMITED- 03251216 - Incorporated on 18 September 1996 
- ION@ LIMITED- 13941042 - Incorporated on 25 February 2022 
- MR.MR. LTDDisolved- 14252327 - Dissolved on 5 December 2023 
- MR MR2 LTD- 11218539 - Incorporated on 21 February 2018 
- ION HV LTD- 08652707 - Incorporated on 15 August 2013 
- IONA M LTD- 09667130 - Incorporated on 2 July 2015 
- AC ION LTD- 12996228 - Incorporated on 4 November 2020 
- A. IONA LTDDisolved- 14216584 - Dissolved on 5 December 2023 
- IONQ LTD- 15461921 - Incorporated on 2 February 2024 
- IONY LTDDisolved- 15307574 - Dissolved on 29 April 2025 
- MR & MR LTD- 16489396 - Incorporated on 2 June 2025 
- ION IP LTD- 06869313 - Incorporated on 3 April 2009 
- FR ION LTDDisolved- 12647849 - Dissolved on 8 February 2022 
- FU5ION LTDActive - Proposal to Strike off- 11739087 - Incorporated on 21 December 2018 
- VI5ION LTD- 13315454 - Incorporated on 6 April 2021 
- SF ION LTDDisolved- 13046271 - Dissolved on 3 May 2022 
- ION.C (UK) LTDDisolved- 14370964 - Dissolved on 13 May 2025 
- CN ION LTDActive - Proposal to Strike off- 09671247 - Incorporated on 6 July 2015