| Avicena Healthcare Ltd | Blackburn | 2024 |
| Avid Fire & Safety Ltd | Colchester | 2023 |
| Avie Care Limited | Birmingham | 2022 |
| Avita Social Care Ltd | Guildford | 2025 |
| AVO Consult Limited | Rochester | 2023 |
| AW Fire & Electrical Ltd | Ely | 2021 |
| AWB and SON Ltd | Dinnington | 2021 |
| Awele Corporation Ltd | Peterborough | 2021 |
| Awero Care & Crafts CIC | Blackburn | 2025 |
| Awkdiagnostics Limited | Oldham | 2021 |
| Awra Noor Global Ltd | Hounslow | 2025 |
| Axcess Health Limited | Chippenham | 2024 |
| AXEL1 Ltd | Manchester | 2022 |
| Axholme Environmental Limited | Belton | 2003 |
| Axle Care Solutions Ltd | Widnes | 2023 |
| Axonmedical Ltd | Hastings | 2020 |
| Ayaan Centre | London | 2020 |
| Ayada Care Services Ltd | London | 2020 |
| Ayassessments Ltd | Hertford | 2023 |
| Aydzo Ltd | Belfast | 2025 |
| Ayesha Tariq Ltd | Dudley | 2022 |
| Ayflorence Limited | Gillingham | 2022 |
| Aylesford Fire Protection Limited | Sevenoaks | 2014 |
| Ayodeen Limited | Woolwivh | 2023 |
| Ayoeja Ltd | Luton | 2023 |
| Ayoola Olajide Limited | Bracknell | 2022 |
| Ayra's Harmony CIC | London | 2024 |
| Ayus Entprise Limited | Northampton | 2024 |
| Ayva Acute Care Ltd | London | 2023 |
| AZ Security Company Limited | London | 2019 |
| Azach Limited | London | 2020 |
| Azariah Care Limited | Manchester | 2023 |
| Azefam Limited | Pontefract | 2016 |
| Azriel Health Limited | Banbury | 2024 |
| B and P Healthcare Limited | Southall | 2024 |
| B Demba Ltd | Newcastle | 2025 |
| B MAS Fire Safety Consultant Limited | Rochester | 2023 |
| B Richards Fire Protection Consultants Limited | Chester | 2007 |
| B Ticks Electric Ltd | London | 2023 |
| B&B Johnson Services Ltd | Wakefield | 2025 |
| B&G Inclusions Limited | Sutton Coldfield | 2025 |
| B-Firesafe Limited | London | 2016 |
| B-Side Music Therapy Ltd | Wimborne | 2025 |
| B. & S. Fire Protection Limited | Ramsgate | 2000 |
| B.A.S.S.T.E.C.H Academy CIC | Edgware | 2025 |
| B.E.T. Wade Fire Protection Ltd | Snodland | 2021 |
| B.M. Wanjiku Limited | Stanford-Le-Hope | 2023 |
| B1 Safety Consultancy Ltd | Chester Le Street | 2019 |
| B4 Fire Ltd | Ipswich | 2015 |
| BA Care Services Ltd | London | 2020 |
| BA Chiropractic Limited | Wymondham | 2026 |
| BA Health & Response Ltd | Attleborough | 2026 |
| BA OT Services Ltd | Nottingham | 2021 |
| Baba Ajagbe Limited | Basildon | 2024 |
| Babcock Aerospace Limited | London | 1999 |
| Babcock Education and Skills Limited | 1 Oxford St | 1998 |
| Babcock Fire Services (SW) Limited | London | 2002 |
| Babcock Fire Services Limited | London | 1999 |
| Babcock Fire Training (Avonmouth) Limited | London | 2001 |
| Babcock Land Defence Limited | London | 2014 |
| Babcock Land Limited | London | 1998 |
| Babcock Marine Training Limited | London | 1995 |
| Babecintegrated Limited | Oxford | 2023 |
| Babela App Ltd | London | 2023 |
| Babinton Integrated Services Ltd | London | 2021 |
| Babs Professionals Limited | Enfield | 2023 |
| Babscareuk Community Interest Company | Birmingham | 2025 |
| Baby RAS Limited | London | 2023 |
| Backworth Quality Improvement Solutions Ltd | Newcastle Upon Tyne | 2014 |
| Baconsosteopathy Limited | Halstead | 2020 |
| BAD Bones Physio Ltd | London | 2025 |
| Badger Health & Safety Limited | St. Helens | 2012 |
| BAE Systems (AL Diriyah C4I) Limited | Camberley | 2004 |
| BAE Systems (Defence Systems) Limited | Camberley | 1929 |
| BAE Systems (Land and Sea Systems) Limited | Camberley | 1990 |
| BAE Systems (Military Air) Overseas Limited | Camberley | 1990 |
| BAE Systems (Oman) Limited | Camberley | 1995 |
| BAE Systems Electronic Systems (Overseas) Limited | Camberley | 2013 |
| BAE Systems Integrated System Technologies (KSA) Limited | Camberley | 2008 |
| BAE Systems Integrated System Technologies (Overseas) Limited | Camberley | 1998 |
| BAE Systems Project Services Limited | Camberley | 1955 |
| Bafe Direct Limited | Gloucestershire | 2025 |
| Bafe Firequal Ltd | Moreton-In-Marsh | 2019 |
| Bafe Firequal Training Ltd | Moreton-In-Marsh | 2024 |
| Bafe Group Ltd | Moreton-In-Marsh | 2024 |
| Bafe International Limited | Moreton-In-Marsh | 2024 |
| Bafe Investments Limited | Gloucestershire | 2026 |
| Bafe Limited | Moreton-In-Marsh | 2018 |
| Bahnan Unique Solution Ltd | Milton Keynes | 2020 |
| Bailey Industries Ltd | Honor Oak Park | 2020 |
| Bailey Rimmington TM Ltd | Doncaster | 2025 |
| Bainbridge Solutions Limited | Leigh-On-Sea | 2021 |
| Balance for Teachers Ltd | Welwyn Garden City | 2021 |
| Balanced and Thriving Ltd | Glenrothes | 2026 |
| Balanced Care Services Ltd | Middlesbrough | 2025 |
| Balanced Mind Emotional Support Ltd | Leominster | 2025 |
| Balanced Therapy Ltd | Leeds | 2024 |
| Balbir S K Ltd | Slough | 2019 |
| Baldwin Business Operations Ltd | Llandeilo | 2025 |
| Bali Pena Ltd | Middleton, Manchester | 2025 |