John Frederick Hartz
🇬🇧Regno Unito
Summary
Date of birth1963
Country of residenceRegno Unito
Roles & Positions
| Role | Company | Country | Status | Date Range |
|---|---|---|---|---|
| Person with significant control | SJ US INVESTMENT LLP | 🇬🇧Regno Unito | Active | 30/09/2025 – present |
| Officer | GREYCOAT EASTCHEAP CAPITAL LLP | 🇬🇧Regno Unito | Active | 10/12/2025 – present |
| Person with significant control | SJ RE CO-INVEST II LLP | 🇬🇧Regno Unito | Active | 02/10/2025 – present |
| Person with significant control | DIDO SPADE OAK LTD | 🇬🇧Regno Unito | Active | 28/09/2025 – present |
| Person with significant control | GM PROPCO LIMITED | 🇬🇧Regno Unito | Active | 23/06/2024 – present |
| Officer | GREYCOAT LONDON CAPITAL LLP | 🇬🇧Regno Unito | Active | 25/03/2026 – present |
| Person with significant control | DALINLONGART LAND LLP | 🇬🇧Regno Unito | Active | 19/06/2024 – present |
| Officer | GREYCOAT CAPITAL LLP | 🇬🇧Regno Unito | Active | 19/12/2025 – present |
| Person with significant control | SJ RE CO-INVEST LLP | 🇬🇧Regno Unito | Active | 23/06/2024 – present |
| Person with significant control | GM TOPCO LLP | 🇬🇧Regno Unito | Active | 02/06/2026 – present |
| Officer | GM PROPCO LIMITED | 🇬🇧Regno Unito | Active | 22/12/2025 – present |
| Person with significant control | INNOVATIVE CHEESE COMPANY LTD | — | Dissolved | 23/06/2024 – present |
| Person with significant control | PROJECT NEPTUNE TOPCO LIMITED | 🇬🇧Regno Unito | Active | 18/06/2024 – 22/03/2019 |
| Person with significant control | MOZART LIMITED PARTNERSHIP | 🇬🇧Regno Unito | Active | 20/06/2024 – present |
| Person with significant control | ISIS PROPERTY MANAGEMENT LIMITED | 🇬🇧Regno Unito | Dissolved | 22/06/2024 – present |
| Person with significant control | AUCHENCAIRN FOREST LLP | 🇬🇧Regno Unito | Active | 19/06/2024 – present |
| Person with significant control | INFLEXION PRIVATE EQUITY PARTNERS LLP | 🇬🇧Regno Unito | Active | 15/06/2024 – present |
| Officer | HUMAN RACE GROUP LIMITED | 🇬🇧Regno Unito | Active | 26/05/2026 – 29/09/2016 |
| Officer | AVANTUS AEROSPACE MIDCO LIMITED | 🇬🇧Regno Unito | Active | 07/05/2026 – 13/06/2022 |
| Officer | AVANTUS AEROSPACE HOLDCO LIMITED | 🇬🇧Regno Unito | Active | 07/05/2026 – 13/06/2022 |
| Officer | EPSILON PARTNERS LLP | 🇬🇧Regno Unito | Active | 08/04/2026 – present |
| Officer | GRIFFIN BIDCO LIMITED | 🇬🇧Regno Unito | Active | 31/05/2026 – 15/12/2009 |
| Officer | MILL WHARF BPRA PROPERTY FUND LLP | 🇬🇧Regno Unito | Active | 30/03/2026 – present |
| Officer | INFLEXION PRIVATE EQUITY PARTNERS LLP | 🇬🇧Regno Unito | Active | 18/12/2025 – present |