| Butler Physiotherapy Ltd | Hoddesdon | 2019 |
| Butlers Inc. Limited | London | 2026 |
| Butlers Medical Ltd | Doncaster | 2022 |
| Butovka Ltd | London | 2019 |
| Butt Lane Healthcare Limited | Stoke-On-Trent | 2011 |
| Butt Medical Responder Services Ltd | Middlesbrough | 2024 |
| Butt Radiology Ltd | Warrington | 2024 |
| Butterbeans Daycare Ltd | Romford | 2022 |
| Buttercross Dental Ltd | Witney | 2022 |
| Buttercup Care Limited | Hemel Hempstead | 2015 |
| Buttercup Dental AJ Limited | Glasgow | 2024 |
| Buttercup Dental Limited | Glasgow | 2016 |
| Buttercup Home Care Ltd | Harrogate | 2020 |
| Buttercup Maternity Therapies and Clinic Limited | Kettering | 2018 |
| Buttercup's OUT of School Care Limited | Belfast | 2008 |
| Buttercups Childcare Ltd | Cambridge | 2016 |
| Buttercups Kindergarten Ltd | Chippenham | 2024 |
| Buttercups Lancashire C.I.C. | Preston | 2026 |
| Buttercups Limited | Lymm | 2002 |
| Butterfield Home Care Limited | St. Helens | 2023 |
| Butterfield Partners Limited | Liverpool | 2019 |
| Butterfield Physiotherapy Limited | Newcastle Upon Tyne | 2011 |
| Butterfields Home Services Limited | Taunton | 2013 |
| Butterflies & Floss Ltd | Salisbury | 2025 |
| Butterflies (Bristol) Limited | Lymm | 2019 |
| Butterflies and Bees Limited | Burton Upon Trent | 2018 |
| Butterflies and Bubbles Sensory Ltd | Colchester | 2023 |
| Butterflies Care & Support Ltd | Lincoln | 2011 |
| Butterflies Care Services Ltd | London | 2024 |
| Butterflies Child & Baby Care Services Limited | Waltham Cross | 2011 |
| Butterflies Childrens Nursery Limited | Hessle | 2000 |
| Butterflies Counselling and Wellbeing Ltd | Manchester | 2023 |
| Butterflies Day Care and PRE School Limited | Ashford | 2024 |
| Butterflies Dental Clinic (Holdings) Ltd | Milton Keynes | 2022 |
| Butterflies Dental Clinic Ltd | Milton Keynes | 2006 |
| Butterflies EDC Ltd | Derby | 2023 |
| Butterflies EY Ltd | London | 2025 |
| Butterflies Home Care Ltd | Andover | 2011 |
| Butterflies Occupational Therapy Limited | Leeds | 2021 |
| Butterflies Playhouse Ltd | Rugby | 2024 |
| Butterflies Pre-School Westgate Limited | Westgate-On-Sea | 2015 |
| Butterflies Speech, Language & Communication Services Limited | Andover | 2022 |
| Butterflies Therapy & Coaching C.I.C. | Battle | 2012 |
| Butterfly Aesthetics (Wakefield) Ltd | Wakefield | 2019 |
| Butterfly Aesthetics Limited | Harrogate | 2011 |
| Butterfly BEA Ltd. | Dudley | 2021 |
| Butterfly Care & Support Ltd | Salford | 2026 |
| Butterfly Care Group Ltd | Ingatestone | 2024 |
| Butterfly Care Ltd | London | 2024 |
| Butterfly Childminding Ltd | Worcester Park | 2015 |
| Butterfly Children Services Ltd | Sheffield | 2022 |
| Butterfly Coach Limited | Cardiff | 2024 |
| Butterfly Counselling Services Limited | Stockton On Tees | 2021 |
| Butterfly Creative Therapy Limited | Bristol | 2017 |
| Butterfly Dental Care Limited | Trafford | 2009 |
| Butterfly Dreams Play Therapy Ltd | Gloucester | 2024 |
| Butterfly Group Healthcare Limited | Carlisle | 2014 |
| Butterfly Heart Homes Ltd | Leyland | 2024 |
| Butterfly Hold Co Ltd | Ingatestone | 2025 |
| Butterfly Home Care Ltd | Chislehurst | 2019 |
| Butterfly House Dementia Care Ltd | Ingatestone | 2024 |
| Butterfly House OP Co Ltd | Ingatestone | 2025 |
| Butterfly House Prop Co Ltd | Ingatestone | 2025 |
| Butterfly Kids Ltd | Manchester | 2025 |
| Butterfly Life Foundation Limited | London | 2018 |
| Butterfly Meadows: Nursery & Pre-School Ltd | Warwick | 2026 |
| Butterfly Medical Aesthetics Ltd | London | 2010 |
| Butterfly Mind Works Ltd. | London | 2022 |
| Butterfly Nursing Ltd | Harrow | 2018 |
| Butterfly Psychology Ltd | Brighouse | 2014 |
| Butterfly Psychotherapy Limited | Thurmaston | 2013 |
| Butterfly Social Care and Catering/Domestic Services Limited | Leicester | 2015 |
| Butterfly Spirit Ltd | Stourbrige | 2014 |
| Butterfly Touch Care Ltd | Kington | 2026 |
| Butterfly Wings Home Care Ltd | Southport | 2024 |
| Butterfly's Pre-School Ltd | Coalville | 2022 |
| Butterflydayz Ltd | Dagenham | 2020 |
| Butterflys Care Homes Ltd | Colchester | 2008 |
| Butterflys Day Nursery (Hammerton) Limited | York | 2023 |
| Butterkiss Aesthetics Ltd | Edinburgh | 2025 |
| Butternut B Ltd | Liverpool | 2018 |
| Butterwick Limited | Stockton On Tees | 1994 |
| Butterworth Dentist Limited | Alnwick | 2007 |
| Butterworth Laser and Surgery Ltd | Newcastle Upon Tyne | 2026 |
| Button Box Therapeutic Services Limited | Telford | 2023 |
| Buttons & Bows Dundee Limited | Dundee | 2018 |
| Buttons Little Angels Day Nursery Ltd | Havant | 2025 |
| Buttons Nanny Limited | Edgware | 2015 |
| Buttons Nursery Limited | Brecon | 2014 |
| Buttons Preschools Limited | Milton Keynes | 2012 |
| Buttress Cover Ltd | Clapham Park | 2016 |
| Butts Croft Limited | Peterborough | 1984 |
| Butts Dental Implants Limited | Twickenham | 2013 |
| Buvans Limited | Chelmsford | 2016 |
| Buvaxo Ltd | Kidderminster | 2022 |
| Buwe Ltd. | Manchester | 2015 |
| BUX Health Group Limited | Bolton | 2023 |
| BUX Healthcare Limited | Preston | 2018 |
| BUX Locum Ltd | Manchester | 2024 |
| Buxpharm Limited | Preston | 2017 |