| BK Medical Services Ltd | Gateshead | 2016 |
| BK Medics Ltd | Bedford | 2022 |
| BK OH Services Ltd | Newtownards | 2023 |
| BK Optical Services Limited | West Bromwich | 2014 |
| BK Optom UK Limited | Birmingham | 2019 |
| BK Provision Limited | Wellingborough | 2016 |
| BK Rowlands Ltd | St. Ives | 2025 |
| BK Social Care Limited | Romford | 2020 |
| BK Solutions Ltd | Derby | 2014 |
| BKA Care Solutions Limited | London | 2021 |
| BKA Private EYE Practice Ltd | Bedford | 2026 |
| Bkairali Ltd | Ipswich | 2020 |
| Bkande Limited | Addlestone | 2020 |
| Bkarob Limited | Abbey Wood, London | 2018 |
| BKD Associate Ltd | Birmingham | 2026 |
| BKD (London) Limited | St Albans | 2023 |
| BKD Dental Ltd | Slough | 2025 |
| BKD Pharm Limited | Sutton Coldfield | 2024 |
| BKH Supported Housing Services Ltd | Bracknell | 2024 |
| Bkind Care Ltd | Leeds | 2018 |
| Bkind Mobile Holistic Therapies Ltd | Ammanford | 2021 |
| Bkkiddies Ltd | Grays | 2020 |
| Bkls Medical & Training Services Ltd | Thetford | 2011 |
| BKM Care Limited | Ilford | 2025 |
| BKM Care Services Ltd | Northwich | 2023 |
| BKM Limited | Tonypandy | 1993 |
| Bkmp Ltd | York | 2015 |
| BKN Dental Ltd | Altrincham | 2023 |
| Bkny Ltd | Spalding | 2019 |
| Bkohealth Ltd | Tilbury | 2024 |
| BKP Associates Ltd | Bolton | 2022 |
| BKR Care Consultancy Limited | Leicester | 2011 |
| BKR CCH Limited | Nottingham | 2014 |
| BKS Medical Services Ltd | Barking | 2025 |
| Bksk Care Limited | Derby | 2026 |
| Bkupe Care Limited | Leeds | 2019 |
| BKY Care Limited | Sutton Coldfield | 2020 |
| BL Adventure Ltd | Horley | 2020 |
| BL Boutique Dent Ltd | Derby | 2020 |
| BL Care Solutions Ltd | Manchester | 2023 |
| BL Childminding Ltd | Bedford | 2021 |
| BL Educational & Child Psychology Ltd | Hornchurch | 2023 |
| BL Health Solutions Ltd | Wolverhampton | 2016 |
| BL Huyton Ltd | Poulton-Le-Fylde | 2016 |
| BL Locum Ltd | Haslingden | 2024 |
| BL Sports Nutrition Ltd | Carnforth | 2025 |
| Bl-Sw Ltd | Barnsley | 2023 |
| Blaar Ltd | Lytham St. Annes | 2025 |
| Blac Opal Lounge Ltd | Loughton | 2025 |
| Black & Brown Dental Limited | Dunfermline | 2020 |
| Black & Eden Limited | London | 2020 |
| Black & Minority Ethnic Carers Support Service | London | 2000 |
| Black & Minority Ethnic Community Partnership | Brighton | 2001 |
| Black and Being Essex CIC | Chadwell Heath | 2024 |
| Black ARK Medical Services Ltd | Gillingham | 2020 |
| Black Bluebell Care Services Limited | Nottingham | 2025 |
| Black British Classical Foundation Limited | London | 2012 |
| Black Carers and Care Workers Network (BCP and Dorset) CIC | Bournemouth | 2025 |
| Black Country Anaesthetic Services Ltd | Eastbourne | 2017 |
| Black Country Care Services Limited | West Midlands | 2003 |
| Black Country Companions Ltd | Halesowen | 2025 |
| Black Country Health Solutions Limited | Walsall | 2011 |
| Black Country Management Limited | Walsall | 2016 |
| Black Country Mental Health | Dudley | 1990 |
| Black Country Orthodontics Ltd | Cardiff | 2014 |
| Black Cube Trading Ltd | Birmingham | 2026 |
| Black Diamond Tattoos Bristol Ltd | Bristol | 2022 |
| Black Dog Imaging Limited | Sheffield | 2017 |
| Black Dog MC Ltd | Accrington | 2024 |
| Black Dog MC Support CIC | Accrington | 2025 |
| Black Dog Mind Club Ltd | Accrington | 2023 |
| Black Dog Wellness Ltd | Stanley | 2021 |
| Black Elephant Ltd | London | 2025 |
| Black Empowerment, Enrichment & Support (Bees) CIC | London | 2020 |
| Black Environment Network | Sheffield | 1995 |
| Black Eyewear Ltd | Redbourn | 1979 |
| Black Funding Network CIC | Arkley | 2020 |
| Black Health Exchange CIC | Sutton Coldfield | 2026 |
| Black Horse Care Limited | Barking | 2022 |
| Black Horse Trading Limited | Salford | 2024 |
| Black Iris Ltd | Lancaster | 2023 |
| Black Isle Optician Ltd | Avoch | 2024 |
| Black IVY Aesthetics Limited | Billericay | 2022 |
| Black Knight Management Ltd | Brecon | 2019 |
| Black LAB Ltd | Watford | 2025 |
| Black Label Group Ltd | Borehamwood | 2017 |
| Black Monocyte Limited | London | 2021 |
| Black Mountains DC Ltd | Pontypridd | 2026 |
| Black ND Neurodiverse CIC | Ruislip | 2024 |
| Black Orchid Club CIC | London | 2025 |
| Black Orchid Health Care Ltd | Rushden | 2026 |
| Black Palm Ltd | Birmingham | 2015 |
| Black Park Chapel Trust Limited | Wrexham | 2009 |
| Black Pear Physio Ltd | Evesham | 2013 |
| Black Pearl Care Solution Ltd | Cardiff | 2022 |
| Black Pearl Medical Ltd | Birmingham | 2019 |
| Black Petal Ltd | Bournemouth | 2025 |
| Black Psychotherapy Community CIC | Birmingham | 2025 |
| Black Psychotherapy Ltd | Birmingham | 2025 |
| Black Rhino Social Club Derby Ltd | Derby | 2025 |