| Blake's Residential Services Ltd | Walsall | 2020 |
| Blanchard Chiropractic Limited | Ryde | 2024 |
| Blast & Ballistic Protection Limited | London | 2003 |
| Blavah UK Ltd | London | 2017 |
| Blaze Group Holdings Ltd | Northampton | 2026 |
| Blaze Guard Ltd | Caterham | 2025 |
| Blaze of Glory Limited | Birmingham | 2025 |
| Blazeshield Limited | London | 2024 |
| Blazeyg Consultancy Services Ltd | Newton Aycliffe | 2024 |
| BLC Safety Advisor Ltd | Conwy | 2023 |
| Blenheim Fire Ltd | Selby | 2019 |
| Blessed CA Limited | Basingstoke | 2024 |
| Blessed Care Legacy Ltd | London | 2020 |
| Blessed Cosmopolitan College, UK Ltd | London | 2022 |
| Blessed Hands Care Limited | London | 2026 |
| Blinch (UK) Limited | York | 2010 |
| Blind Justice C.I.C. | Brighton | 2025 |
| Blinky Fire and Safety Solutions Limited | London | 2021 |
| Blirzt Care Solutions Ltd | Tilbury | 2023 |
| Blissful Logistics Limited | Harlow, Essex | 2021 |
| BLN Safety & Compliance Ltd | Stafford | 2026 |
| Block AID UK (Smith & West) Limited | Northamptonshire | 2005 |
| Block AID UK Limited | Northants | 2019 |
| Bloods and Needles Academy Limited | London | 2020 |
| Bloom Baby and Child Therapies Limited | London | 2025 |
| Bloom Longevity Labs Ltd | Leeds | 2025 |
| Bloom Regulatory Ltd | London | 2019 |
| Blooming Good Care Ltd | Stoke-On-Trent | 2021 |
| Blooming Seed CIC | London | 2025 |
| Bloomsdale Care Solutions Ltd | Northampton | 2023 |
| Blossom Nashe Ltd | Hythe | 2026 |
| Blossom Path Care Limited | Southampton | 2025 |
| Blossom Within & Beyond Psychological & Therapeutic Services Limited | Colchester | 2025 |
| Blossomstar Care Limited | Weston-Super-Mare | 2025 |
| BLU Haven Care Ltd | Southall | 2021 |
| BLU Petal Home Care Ltd | Milton Keynes | 2023 |
| Blubreed Healthcare Ltd | London | 2025 |
| Blue 9 Security Limited | Stanmore | 2006 |
| Blue Beach Ventures Ltd | London | 2021 |
| Blue Cross Healthcare Services Limited | Croydon | 2018 |
| Blue FOX Holdings Limited | Malvern | 2025 |
| Blue Harbor Tradings Private Limited | Oldham, United Kingdom | 2026 |
| Blue Pearl Care Ltd | London | 2025 |
| Blue Phoenix Safety Solutions Ltd | St Ives | 2021 |
| Blue Rain Advance Limited | Birmingham | 2026 |
| Blue Sky Homecare Ltd | Birmingham | 2026 |
| Blue Sky Services (East Midlands) Limited | Chesterfield | 2019 |
| Blue Sky Training Academy Ltd | Dagenham | 2025 |
| Blue Tile Health Ltd | Dereham | 2024 |
| Blue Tree (Supported) Homes Ltd | Wallington | 2024 |
| Blue-Sky Pathways Limited | Manchester | 2024 |
| Blue/Yellow Fundraising UK | London | 2022 |
| Bluebell Children's Care Ltd | Rochdale | 2022 |
| Bluebird Consulting Limited | Castle Cary | 2010 |
| Blueboat Support & Training Services CIC | Ilkley | 2026 |
| Bluecrest Tradings Private Limited | Oldham, United Kingdom | 2026 |
| Bluecrosslifecare Ltd | Manchester | 2018 |
| Blueguard Fire Safety Ltd | Romford | 2024 |
| Bluelight Fire Stopping Solutions Ltd | London | 2026 |
| Blueline Security Limited | Enfield | 2017 |
| Bluespot Homecare Contractor Limited | Loughton | 2021 |
| Bluezone Performance Ltd | Watford | 2025 |
| Blyths Film & Location Safety Services Limited | Weston-Super-Mare | 2019 |
| BM Care Consultancy Limited | Stevenage | 2025 |
| BME United Limited | Wolverhampton | 2005 |
| BMS Courses Ltd | London | 2024 |
| BMT Security Ltd | Yateley | 2022 |
| BNF Care Ltd | Northampton | 2025 |
| BNO Visa Ltd | Mansfield | 2021 |
| Boadu Care Limited | Wolverhampton | 2018 |
| Bobak Services Limited | Barking | 2020 |
| Bobozam Limited | Swindon | 2024 |
| Bodbud Healthcare Ltd | Bushey | 2024 |
| Boeing Defence UK Limited | London | 1976 |
| Bogeot Ltd | London | 2026 |
| Bolan Services Limited | Dagenham | 2024 |
| Bolingo Care Ltd | Birmingham | 2021 |
| Bolton Life CIC | Bolton | 2025 |
| Bonafide Care Ltd | Solihull | 2023 |
| Bonds of Information CIC | London | 2025 |
| Bonnar Fire Risk Assessments Ltd | Thame | 2025 |
| Bonnie.Rlhealthcare Ltd. | Hull | 2022 |
| Booka Club Limited | Braintree | 2026 |
| Bora Solutions Ltd | Swadlincote | 2019 |
| Boscho Healthcare Limited | Manchester | 2025 |
| Bosijo Enterprises Ltd | 13 Henley Cross | 2023 |
| Bosjay Limited | Corby | 2022 |
| Bosjof Ltd | Harlow | 2023 |
| Bossvark Consulting Ltd | Bromsgrove | 2023 |
| Bothy Eleven Marketing Limited | Perth | 2026 |
| Bouhadna Chiropractic Limited | Basildon | 2024 |
| Bourne Safety Ltd | Cannock | 2018 |
| Bournemouth Coastal BID | Christchurch | 2012 |
| Bournemouth Town Centre BID | Bournemouth | 2012 |
| Bournville Medical Ltd | Bicester | 2025 |
| Bovey Futures Limited | Newton Abbot | 2017 |
| BOW Fire Ltd | Leeds | 2021 |
| BOW Waves Ltd | Ruislip | 2019 |
| Bowen Training UK Ltd | Hereford | 2019 |
| Boxwood Leisure Limited | Chorley | 2001 |