| Bolton Smart Enterprise C.I.C. | Bolton | 2011 |
| Bolton Together | Bolton | 2013 |
| Bolton Tuition Hub Ltd | Bolton | 2024 |
| Bolus Revision Limited | North Shields | 2026 |
| Boman Education Ltd | Romford | 2021 |
| Bombers E Bikes Ltd | Runcorn | 2021 |
| BON BON Bean Limited | York | 2022 |
| Bonanza Creative Ltd | Coventry | 2021 |
| Bonas Macfarlane Consulting Limited | London | 2010 |
| Bonas Macfarlane Tuition Limited | London | 2000 |
| Bonbini Ltd | London | 2021 |
| Bond Fitness and Wellbeing Ltd | Milltimber | 2020 |
| Bond Medical Consulting Limited | Kirkby In Furness | 2024 |
| Bond Street Languages Limited | London | 2014 |
| Bond Street Nursery School Limited | Leicester | 2025 |
| Bondak Educational Management Consultancy Limited | London | 2015 |
| Bonding School Nurseries Limited | Bromley | 2023 |
| Bone by Bone Ltd | London | 2025 |
| Bonewarrior.Eu Ltd | London | 2026 |
| Bong DS Ltd | Harrow | 2019 |
| Boni Connectix Ltd | London | 2025 |
| Boniface Enterprises Limited | Bishop'S Stortford | 2020 |
| Bonitas Multi-Academy Trust Limited | Bracknell | 2011 |
| Bonitots Herbert Limited | London | 2019 |
| Bonitots Ltd | London | 2018 |
| Bonnie 'N' Braw Ltd | Glasgow | 2026 |
| Bonnington House Nursery School Ltd | Livingston | 2015 |
| Bonny Snowdon Academy Ltd | London | 2021 |
| Bonsai AZ Management Limited | Stevenage | 2013 |
| Bonsai Business Solutions Ltd | Newton Abbot | 2013 |
| Bont Community Project Ltd | Pontarddulais | 2026 |
| Bonum Safety Services Limited | Hitchin | 2018 |
| Bonzer Education Ltd | Bristol | 2018 |
| BOO Education Limited | Derby | 2023 |
| BOO Theatre and Entertainment Ltd | Maldon | 2025 |
| Boodl Financial Coaching Ltd | London | 2024 |
| Boodl World Ltd | London | 2023 |
| Boogie Bear Music & Drama Limited | Hertford | 2017 |
| Boogie Mites UK Ltd | Portsmouth | 2007 |
| Boogie Pumps (Farnham) Ltd | Camberley | 2019 |
| Boogie Pumps (Fleet) Ltd | Lancaster | 2019 |
| Boogie Pumps (Guildford) Ltd | Farnham | 2017 |
| Boogie Pumps Ltd | Farnham | 2019 |
| Book AID International | London | 1966 |
| Book Club Associates Ltd | Whitstable | 2026 |
| Book Driving Theory Limited | Oldbury | 2017 |
| Book Tuition Ltd | Bradford | 2025 |
| Book UNI Limited | Hounslow | 2019 |
| Book UP Your Life Ltd | Huddersfield | 2021 |
| Bookacourse Ltd | Chatham | 2019 |
| Bookandtrain.Com Limited | Shefford | 2014 |
| Bookanexam Ltd | Leeds | 2019 |
| Bookbridge Tutoring Limited | Peterborough | 2025 |
| Bookcom Ltd | London | 2025 |
| Booked N Paid UK Limited | Benfleet | 2025 |
| Bookg Ltd | London | 2025 |
| Booking English Limited | Plymouth | 2015 |
| Bookingteachers Limited | London | 2020 |
| Bookkeepers Summit Limited | High Wycombe | 2016 |
| Booklove and Beyond CIC | London | 2020 |
| Booklove Limited | London | 2016 |
| Bookmark Reading Charity | London | 2017 |
| Books 4 U Ltd | Huddersfield | 2000 |
| Books and Beyond Limited | London | 2024 |
| Books for Everyone | Manchester | 2019 |
| Books for Peace Ltd | London | 2025 |
| Books to Africa International | Canterbury | 2013 |
| Bookschoolcover.Com Limited | Gwaelod-Y-Garth | 2009 |
| Bookselect-Uk Ltd | Greenford | 2012 |
| Booktastic Network CIC | Donaghadee | 2024 |
| Booktastic Newbury CIC | Newbury | 2026 |
| Booktrust | Leeds | 1925 |
| Bookwave Ltd | London | 2024 |
| Bookworm Education Ltd | Southall | 2025 |
| Boom Arts Creative Futures CIC | Burgess Hill | 2026 |
| Boom Community Tennis CIC | Surrey | 2022 |
| Boom Dance Productions Limited | Liverpool | 2015 |
| Boom Driving School Ltd | Banbury | 2023 |
| Boom Instructor Training Ltd | Mansfield | 2022 |
| Boom Sailing Limited | Conwy | 2016 |
| Boom Sports Coaching Ltd | Basildon | 2024 |
| Boom Training Limited | Southampton | 2014 |
| Boom Weight Loss and Fitness Ltd | Southampton | 2025 |
| Boom-Wow Theatre CIC | London | 2022 |
| Boomerang Kids | Brighton | 2002 |
| Boomhall Trust | Londonderry | 2019 |
| Boomsatsuma Limited | Bristol | 2025 |
| Boomsatsuma Projects Limited | Bristol | 2025 |
| Boomsatsuma Specialist Provision Limited | Bristol | 2025 |
| Boon Development Ltd | West Kensington | 2023 |
| Boost + Learning Limited | Manchester | 2024 |
| Boost Academy Ltd | Weston-Super-Mare | 2021 |
| Boost Beauty Limited | Newport | 2022 |
| Boost Education (Franchising) Limited | London | 2020 |
| Boost Education Charged UP Limited | London | 2009 |
| Boost Educational Ltd | Hornchurch | 2020 |
| Boost Life Skills Ltd | Amersham | 2019 |
| Boost My Maths Ltd | Croydon | 2025 |
| Boost Tutoring Limited | Berkhamsted | 2017 |
| Boost Tutors Limited | London | 2023 |