| 1189 Communications Limited | Information & communication | 2016 |
| 24/7 Crane Hire Ltd | Construction | 2015 |
| 303 Trading Limited | Health & social care | 2014 |
| 4WRIGHT Construction Limited | Construction | 2024 |
| 8&9 the Green Management Limited | Households | 2022 |
| 888LANDSCAPES Ltd | Construction | 2026 |
| A a Tank Supplies Group Ltd | Water & waste | 2019 |
| A Direction Housing Ltd | Real estate | 2025 |
| A Direction Limited | Professional & scientific | 2023 |
| A Plus GAS Services Ltd | Professional & scientific | 2021 |
| Aahmechanics Ltd | Professional & scientific | 2021 |
| AB Construction & Civils Ltd | Construction | 2025 |
| AB Renewable Services Ltd | Manufacturing | 2025 |
| ABC Party UK Ltd | Wholesale & retail | 2024 |
| Accedo Group Ltd | Professional & scientific | 2020 |
| Accrual World Accounting Solutions Ltd | Professional & scientific | 2020 |
| ACS Plastering Limited | Construction | 2012 |
| Active Clothing Ltd | Wholesale & retail | 2025 |
| Adam Yews Joinery Ltd | Construction | 2018 |
| AED Medical Ltd | Education | 2020 |
| Agency Consulting Limited | Professional & scientific | 2018 |
| Ahmed Spice Peterlee Ltd | Hospitality | 2025 |
| AHV Cable Services Ltd | Construction | 2025 |
| AI OPS Solutions Ltd | Information & communication | 2022 |
| Aj's Catering Limited | Hospitality | 2010 |
| AJW Cable Services Ltd | Construction | 2025 |
| Akone Limited | Hospitality | 2024 |
| Aldona Seals Ltd | Manufacturing | 1988 |
| Ales 'N' Tails Ltd | Hospitality | 2023 |
| Alex 12 Ltd | Wholesale & retail | 2025 |
| Alexander and Davies Ltd | Real estate | 2017 |
| Alexander Investco Limited | Financial services | 2025 |
| Alexander Technologies Europe Limited | Manufacturing | 1984 |
| Alpha Process Controls (International) Limited | Manufacturing | 1978 |
| Alpharoofingandbulding Ltd | Construction | 2026 |
| AM Robson Logistics Ltd | Transport & logistics | 2025 |
| AM2PM Horden Ltd | Wholesale & retail | 2024 |
| AMG Inspection Services Ltd | Professional & scientific | 2024 |
| Andrew Bennett Logistics Ltd | Transport & logistics | 2025 |
| Anticipate Global Limited | Wholesale & retail | 2024 |
| Aplomado Bidco Limited | Financial services | 2026 |
| Aplomado Holdco Limited | Financial services | 2026 |
| Aplomado Midco Limited | Financial services | 2026 |
| Aplomado Topco Limited | Financial services | 2026 |
| Apollo Pavilion Projects CIC | Arts & recreation | 2021 |
| Apollo Schools Trust | Education | 2013 |
| Aqualux Pool and Spa Ltd | Administrative & support | 2023 |
| ARC Homes North Ltd | Real estate | 2025 |
| ARC Paint Solutions Ltd | Construction | 2019 |
| Arcs Revolution Engineering Ltd | Professional & scientific | 2026 |
| Arcs Revolution Ltd | Professional & scientific | 2025 |
| Arcs Revolutionary Technology Limited | Administrative & support | 2026 |
| ARD Technologies Limited | Professional & scientific | 2026 |
| Armed Defence Ltd | Administrative & support | 2025 |
| Ascend Digital Marketing Ltd | Professional & scientific | 2025 |
| Aspire Alternative Education Limited | Education | 2017 |
| Aspired Logistics Limited | Transport & logistics | 2021 |
| Aspired Motors Limited | Wholesale & retail | 2023 |
| Atel Holdings Limited | Financial services | 2019 |
| Atlas' Grooming PAD Ltd | Other services | 2026 |
| Audit Solutions (UK) Limited | Professional & scientific | 1991 |
| Automatic Cars Group Limited | Wholesale & retail | 2025 |
| Autopace Deliveries Limited | Other services | 2024 |
| Avant-Garde Arts Limited | Education | 1999 |
| B & H Property Services Ltd | Construction | 2021 |
| B Balanced Community Interest Company | Construction | 2024 |
| B H K Flooring Limited | Wholesale & retail | 2005 |
| B Supps Ltd | Hospitality | 2022 |
| B. Mcmanus Mechanical Services Ltd | Professional & scientific | 2026 |
| B.Powerful Education Ltd | Education | 2024 |
| Baby Abode Ltd | Wholesale & retail | 2016 |
| Barker F&S Ltd | Construction | 2025 |
| Barker Fire & Security Limited | Professional & scientific | 2022 |
| BAZ 4 Seasons Pizzeria Ltd | Hospitality | 2025 |
| BC Builds Ltd | Construction | 2026 |
| BEC & HAY Ltd | Hospitality | 2025 |
| Beddells Couriers Ltd | Transport & logistics | 2023 |
| Bell Property's and Maintenance Ltd | Households | 2025 |
| Berger Closures Limited | Manufacturing | 1988 |
| Berry Education Ltd | Information & communication | 2020 |
| BHK (UK) Limited | Manufacturing | 1987 |
| BIM 360 Limited | Professional & scientific | 2025 |
| Bishop's Beds Ltd | Manufacturing | 2005 |
| Bishops Groundworks Ltd | Construction | 2026 |
| BJ Lifting Solutions Ltd | Education | 2023 |
| Black Amber Group Ltd | Manufacturing | 2025 |
| BLR Capital LLP | | 2026 |
| Bobabru Limited | Hospitality | 2025 |
| Box Clever (Horden) Limited | Extraterritorial | 2019 |
| Branarc Engineering Ltd | Professional & scientific | 2024 |
| Brancepeth Consultants Ltd | Professional & scientific | 2018 |
| Brandlings Way 1966 Limited | Extraterritorial | 2014 |
| Brandmile Limited | Professional & scientific | 1999 |
| Brightman PT-78 Welding Inspection Services Limited | Professional & scientific | 2018 |
| Bristol Elite Properties Limited | Construction | 2026 |
| Britannia Property Solutions Limited | Real estate | 2025 |
| Broadcastandcorporate Ltd | Information & communication | 2016 |
| Brockwell Manor Ltd | Real estate | 2025 |
| Brownes Hearing Solutions Holdings Ltd | Financial services | 2024 |
| Bruce N Co Limited | Manufacturing | 2021 |