| Birchwood Park Golf Centre Limited | Surrey | 1997 |
| Birchwood Strategies and Associates Ltd | Mirfield | 1998 |
| Birchwoode Entertainment Ltd | Nottingham | 2025 |
| Bird & Bird Company Secretaries Limited | London | 2000 |
| Bird & Company Design Limited | Whitby | 2009 |
| Bird and Hound Limited | Basildon | 2026 |
| Birdhurst Management Co Limited | | 2002 |
| Birdi Entrepreneur Ltd | Maidenhead | 2021 |
| Birds Hill Nursing Home Limited | Bournemouth | 2016 |
| Birdsall Beef Company Limited(The) | Malton | 1985 |
| Birdsgrove Fishing 2007/10 Limited | Ashbourne | 2013 |
| Birdsystem Ltd | Manchester | 2011 |
| Birdview Estates Ltd | London | 2019 |
| Birdwhistle Books Ltd | Godalming | 2021 |
| Birfield Limited | Birmingham | 1891 |
| Birght Path Investment Advisors Ltd | Manchester | 2026 |
| Birght Path Realty Ltd | Manchester | 2026 |
| Birgitt S Johansen Limited | London | 2008 |
| Birkdale 1963 Limited | Dewsbury | 2014 |
| Birkdale Sales Unlimited | High Wycombe | 2015 |
| Birkeland Hageservice Limited | London | 2023 |
| Birketts Directors Limited | Ipswich | 1990 |
| Birketts Legal Services Limited | Ipswich | 1993 |
| Birketts Secretaries Limited | Ipswich | 1990 |
| Birley Grange Developments Limited | Sheffield | 2024 |
| Birley Grange Estates Limited | Chesterfield | 2011 |
| Birley Grange Properties Ltd | Sheffield | 2024 |
| Birmingham Aluminium Limited | Birmingham | 2014 |
| Birmingham AM2 Limited | Birmingham | 2017 |
| Birmingham Avionics Limited | Pershore | 1983 |
| Birmingham Barbed Tape Limited | Worcester | 2013 |
| Birmingham C.O.C. Pension Fund Trustee Company Limited(The) | Birmingham | 1950 |
| Birmingham Cable Limited | Reading | 1988 |
| Birmingham City Access Limited | Cheltenham | 2025 |
| Birmingham City Enterprises Limited | Birmingham | 1998 |
| Birmingham Commonwealth Association Limited | Rushwick | 2016 |
| Birmingham Contact Centre Ltd | Solihull | 2021 |
| Birmingham Crematorium (1973) Limited | Sutton Coldfield | 1939 |
| Birmingham Door Panels Ltd | West Bromwich | 2016 |
| Birmingham Doors Ltd | West Bromwich | 2016 |
| Birmingham Electrical Training Group Limited | Birmingham | 2005 |
| Birmingham Enterprise Wharf Holdings Limited | Manchester | 2021 |
| Birmingham Estates Limited | Manchester | 2015 |
| Birmingham FAN Limited | Solihull | 2017 |
| Birmingham Grab Hire Limited | Bickenhill | 2012 |
| Birmingham Health Innovation Campus Limited | Manchester | 2020 |
| Birmingham Metal Holdings Limited | Birmingham | 1987 |
| Birmingham Metropolitan Estates Limited | Birmingham | 2007 |
| Birmingham Packaging Ltd | Birmingham | 2010 |
| Birmingham School of English Ltd | Birmingham | 2021 |
| Birmingham Skills Academy Limited | Chesterfield | 2020 |
| Birmingham Skip Hire Ltd | Birmingham | 2010 |
| Birmingham Storage Ltd | Solihull | 2024 |
| Birmingham Taxi Warehouse Limited | Liverpool | 2005 |
| Birmingham Tints Ltd | Birmingham | 2022 |
| Birnbeck Logistics Limited | Weston-Super-Mare | 2021 |
| Birnie Landfill Limited | Cupar | 1997 |
| Biroman Limited | Loughborough | 1993 |
| Birr Enterprises Limited | Bridgend | 2017 |
| Birth Technology Limited | Solihull | 2011 |
| Birthday Buddy Limited | Kent | 2000 |
| Birthday Party Decorations Limited | West Drayton, Yewsley | 2022 |
| Birthprep Limited | Ossett | 2010 |
| Biryani & Co Ltd | Birmingham | 2017 |
| Biryanimax Hayes Limited | Staines-Upon-Thames | 2023 |
| Biscop House Management Company Limited | Jarrow | 2007 |
| Bisen Group Limited | London | 2015 |
| Bishop Auckland Estates Ltd | Manchester | 2016 |
| Bishop Cromwell Ltd | Garforth | 2023 |
| Bishop Fleming Corporate Finance Limited | Exeter | 2000 |
| Bishop Jones Group Limited | Wells | 2015 |
| Bishop Jones Limited | Wells | 2015 |
| Bishop Maintenance Services Limited | London | 2014 |
| Bishop Pipefreezing International Limited | Westerham | 2002 |
| Bishopmill 1972 Limited | Elgin | 2014 |
| Bishops Farm Estates Limited | Southfields Business Park | 1997 |
| Bishops Garages (Brighton) Limited | Guildford | 1963 |
| Bishops Holdings Ltd | Slough | 2016 |
| Bishops House Furnishers Limited | Driffield | 1951 |
| Bishops Nympton Parish Hall Trust | South Molton | 2010 |
| Bishops Waltham Gridco Limited | Aylesbury | 2020 |
| Bishopscourt Racing Circuit Ltd | Rampart Road | 2009 |
| Bishopsgate Serviced Apartments Ltd | Coventry | 2013 |
| Bishtons Painting and Decorating Limited | Huddersfield | 2019 |
| Bisley GUN Club ( Down the Line ) Ltd. | Caterham | 2013 |
| Bisley GUN Club ( DTL ) Ltd. | Caterham | 2013 |
| Bisley GUN Club (1923) Ltd. | Caterham | 2013 |
| Bisley GUN Club (CTS) Ltd | Caterham | 2013 |
| Bisley GUN Club Ltd. | Caterham | 2013 |
| Bismarck Storage & Packing Ltd | Droylsden | 2023 |
| Bismillah Hajj & Umrah Ltd | London | 2021 |
| Bismillah Signs Limited | Bedford | 2011 |
| Bisn Technologies Ltd | Manchester | 2010 |
| Bison Assist Holdings Limited | Castleford | 2016 |
| Bison Employee Benefit Trustees Limited | Keighley Bradford | 2004 |
| Bison Precast Limited | Northampton | 2017 |
| Bisou Bisou Limited | West Clandon | 2005 |
| Bispham Road Pharmacy Limited | Chester | 2009 |
| Bissec Holdings Limited | Wisbech | 2018 |
| Bistech Managed Services Ltd | Dorset | 1999 |