| Role | Company | Country | Status | Date Range |
|---|---|---|---|---|
| Person with significant control | BEN JOHNSTON MECHANICAL LIMITED | 🇬🇧United Kingdom | Dissolved | 18/06/2024 – present |
| Person with significant control | BRIAN JOHNSTON LTD | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | TRANSFORM SERVICES (N.I.) LIMITED | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | RHIEDORRACH ESTATES LLP | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | SINCLAIR BAY ELECTRICAL LTD | 🇬🇧United Kingdom | Proposal to strike off | 18/06/2024 – present |
| Person with significant control | BROCKVILLE SERVICES LTD | 🇬🇧United Kingdom | Proposal to strike off | 19/06/2024 – present |
| Person with significant control | CALLATER LODGE LLP | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | B JOHNSTON PROJECTS LIMITED | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | SMITH ROAD LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – 02/01/2019 |
| Officer | SMITH ROAD LIMITED | 🇬🇧United Kingdom | Active | 13/04/2026 – 01/09/2023 |
| Person with significant control | 46 BULWER ROAD (FREEHOLD) LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | JINXIES LIMITED | 🇬🇧United Kingdom | Proposal to strike off | 19/06/2024 – present |
| Person with significant control | BEEJ CONSULTING LTD | — | Dissolved | 18/06/2024 – present |
| Person with significant control | JOHNSTON AGRI SUPPLIES LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | BLACKSHAMROCK CONSTRUCTION LIMITED | — | Dissolved | 19/06/2024 – present |
| Person with significant control | ANNAGARVEY HOLDINGS LIMITED | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | BRIAN JOHNSTON & CO (INSURANCE BROKERS) LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | SOUTH LONDON SERVICES LIMITED | 🇬🇧United Kingdom | Dissolved | 18/06/2024 – present |
| Person with significant control | DAIRI FRESH ICE CREAM LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – 11/06/2021 |
| Person with significant control | LIL (HOLDINGS) LIMITED | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | FIRSTJOHNSTON CONSULTING LTD | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | LINKFIELD ACCIDENT MANAGEMENT LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | ULSTER MAID (DAIRY ICES) LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – 11/06/2021 |
| Person with significant control | LINKFIELD INSURANCE LOGISTICS LIMITED | 🇬🇧United Kingdom | Liquidation | 18/06/2024 – present |
| Person with significant control | LINKFIELD LOSS RECOVERY SERVICES LIMITED | 🇬🇧United Kingdom | Liquidation | 19/06/2024 – present |
| Person with significant control | JOHNSTON MEDICAL SERVICES LIMITED | 🇬🇧United Kingdom | Liquidation | 15/01/2024 – present |
| Person with significant control | JOHNSTON POULTRY SALES LIMITED | 🇬🇧United Kingdom | Active | 18/06/2024 – present |
| Person with significant control | BRIAN JOHNSTON & CO. (INSURANCE SERVICES) LIMITED | 🇬🇧United Kingdom | Active | 19/06/2024 – present |
| Person with significant control | REDHILL MASTERS LIMITED | — | Dissolved | 19/06/2024 – present |
| Person with significant control | — | — | Active | 19/06/2024 – present |
| Person with significant control | — | — | Active | 18/06/2024 – present |
| Officer | JOHNSTON MEDICAL SERVICES LIMITED | 🇬🇧United Kingdom | Liquidation | 10/03/2026 – present |
| Officer | JOHNSTON POULTRY SALES LIMITED | 🇬🇧United Kingdom | Active | 18/05/2026 – 01/05/2026 |
01/05/2026
resigned
13/04/2026
Northern Ireland → United Kingdom
06/04/2016
appointed