| Basingstoke Locksmiths Limited | Fareham | 2000 |
| Basis Consulting Limited | Leeds | 2002 |
| Basis Services UK. Ltd | Peterborough | 2013 |
| Basis Solutions Limited | Leeds | 2002 |
| Basis Technologies Enablement Services Limited | Bracknell | 2009 |
| Basking Babies Baby Massage Limited | Brackley | 2014 |
| Basking Babies IP Ltd | Brackley | 2014 |
| Basle Line Co. Limited | London | 2000 |
| Baslow Close 1965 Limited | Birmingham | 2014 |
| Basmaa Consultancy and Marketing Ltd | London | 2014 |
| Basota Holdings Ltd | London | 2022 |
| Basota Investments Ltd | London | 2022 |
| Bass Drum Digital Limited | Heathfield | 2020 |
| Bass Pacific Services Ltd | Lancing | 2016 |
| Bassaire Hvac Ltd | Sherfield English | 2015 |
| Bassaire Limited | Romsey | 1987 |
| Bassam Shawl Manufacturing Co. Limited | Preston | 1996 |
| Bassenhall (Jesmond) Management Limited | Dorchester | 1996 |
| Bassett Road (NO.1) | London | 2003 |
| Bassett Road (NO.2) | London | 2003 |
| Bassett Skips Limited | Gloucestershire | 2003 |
| Bassett Wood Co. Limited(The) | Swindon | 1976 |
| Bassett Wood West Ltd | Southampton | 2013 |
| Bassoon Co., Ltd | Kenilworth | 2023 |
| Bastacom Ltd. | Stafford | 2024 |
| Bastad Handel Limited | London | 2025 |
| Bastion Homes (Riverside Olney) Ltd | Chipping Campden | 2014 |
| Baston House Limited | London | 1999 |
| BASYM10 Limited | Cinderford | 2006 |
| BAT 3 Limited | Blackburn | 2017 |
| BAT Plant Hire Limited | Liverpool | 1972 |
| BAT TEN Electrical Contracting Services Limited | Lymington | 2011 |
| Bata Swlf Ltd | London | 2019 |
| Batasi Limited | Birmingham | 2012 |
| Batchelor Sharp Limited | Bristol | 2020 |
| Batchpac Limited | Doncaster | 2005 |
| Batchworks Ltd | Washington | 2010 |
| Batchworth Support Services Limited | London | 2005 |
| Batchworth Wealth Management Limited | Northwood | 2012 |
| Bateman Catering Limited | Rubery Birmingham | 1972 |
| Bateman Civil Engineering Limited | Norwich | 2009 |
| Bateman Healthcare Services Limited | Rubery Birmingham | 1983 |
| Batemans Limited | Grange-Over-Sands | 1989 |
| Bates & Hunt Limited | Warrington | 2007 |
| Bates Weston Corporate Trustee Limited | Derby | 2017 |
| Batesy Recycling Limited | Belfast | 2011 |
| Batesy Skip Hire Limited | Belfast | 1999 |
| Bath & Tile Studio Ltd | Greenock | 2024 |
| Bath Ales Limited | St. Austell | 2000 |
| Bath and Design Ltd | Stansted | 2025 |
| Bath and Shower House Limited | Wallingford | 2021 |
| Bath Bubble and Beyond Limited | Poole | 2009 |
| Bath Court (Folkestone) Limited | Canterbury | 1950 |
| Bath Directors UK Limited | Bath | 2014 |
| Bath Equipment Research and Development Co., Ltd | London | 2020 |
| Bath Holiday Rentals Limited | Bideford | 2009 |
| Bath Property Letting Ltd | Camberley | 1988 |
| Bath Recycling Skips Limited | Bath | 2007 |
| Bath Road Property and Asset Limited | Heathrow | 2018 |
| Bath Terrace Management Company Ltd | | 2008 |
| Bath Time Mobility Limited | Bracknell | 2012 |
| Bathco EU Ltd. | King'S Lynn | 2012 |
| Bathe Retail Ltd | Cookstown | 2022 |
| Batheson Ltd | Exeter | 2002 |
| Bathgate & Co. (Cork) Limited | Walsall | 2012 |
| Bathill Capital Ltd | London | 2021 |
| Bathing Belles Ltd | Worthing | 2010 |
| Bathroom Centre Limited | Stockton Heath | 2010 |
| Bathroom Store (Lyndhurst) Limited | Poole | 2007 |
| Bathroom Supermarket Limited | Evesham | 2011 |
| Bathroomdiscount.Co.Uk Limited | London | 2000 |
| Bathrooms of Bournemouth Limited | Bournemouth | 2008 |
| Bathtime Scotland Limited | Hamilton | 2009 |
| Bathweston Two Ltd | Bristol | 2011 |
| Bathwick Tower Management Limited | Bath | 2000 |
| Bathwick Tyres Limited | Winchester | 1984 |
| Batik Limited | Middlesex | 2002 |
| Batlon Secretarial Services Limited | London | 1999 |
| Batmews Limited | Waltham Cross | 2014 |
| Bats Investments Limited | London | 2006 |
| Bats Limited | London | 2023 |
| Batt-Capelli Limited | Leeds | 2020 |
| Battbridge Limited | London | 2016 |
| Battered Cabbage Limited | Ross-On-Wye | 2021 |
| Battersea Anthology Limited | London | 2023 |
| Battersea Power Station Company Limited | London | 2026 |
| Battery Business Service Limited | London | 2013 |
| Battery Force Ltd. | Manchester | 2003 |
| Battery Vehicle Systems Limited | Glasgow | 2024 |
| Batterymasters Limited | Greenford | 2012 |
| Battiston Consulting Ltd | Hertford | 2012 |
| Battle Aviation Services Limited | St. Leonards-On-Sea | 2002 |
| Battle Caps Ltd | Bristol | 2025 |
| Battle Consultancy Ltd | Robertsbridge | 2005 |
| Battledore FM Limited | Barnet | 2014 |
| Battlehill Holdings Ltd | Craigavon | 2024 |
| Batty Adventures Ltd | Swansea | 2021 |
| Batu Limited | Liverpool | 2005 |
| Baty Casson Long Limited | Harrogate | 1956 |
| BAU - HAI Ltd | Eastleigh | 2003 |