| Bestminster Limited | Real estate | 2001 |
| Beverley Court (Jesmond Road) Management Company Limited | Households | 1989 |
| Bevin Court Management Company Limited | Households | 2007 |
| BH2 Developments Limited | Construction | 2025 |
| Bhcollective Ltd | Wholesale & retail | 2025 |
| Bideford Management Company Limited | Households | 2013 |
| Bidford Meadows (Bidford on Avon) Management Company Limited | Households | 2017 |
| Bidwell Mews Management Company Limited | Households | 2021 |
| Billington Grove (SM) Management Company Limited | Households | 2010 |
| Billion Bites Ltd | Information & communication | 2016 |
| Billpost Limited | Households | 1992 |
| Binley Place Management Company Limited | Households | 2014 |
| Birch Flats Limited | Households | 1964 |
| Birchwood Close Residents' Association Limited | Households | 1987 |
| Bishop Management Services Limited | Hospitality | 2024 |
| Bishop Park (Henfield) Management Company Limited | Households | 2016 |
| Bishop's Grange (Higham Ferrers) Management Company Limited | Households | 2014 |
| Bitton Mill Bristol Management Company Limited | Households | 2017 |
| Blackmore MAY Ltd | Professional & scientific | 2019 |
| Blakenhall Gardens Residents Management Company Limited | Households | 2011 |
| Bletchley Park Management Company Limited | Households | 2007 |
| Block C White Land (Forum) Resident Management Company Limited | Households | 2025 |
| Blocksolid Property Management Limited | Households | 1990 |
| Bloomhive Newmilton Limited | Hospitality | 2025 |
| Bloxham Grange (Bloxham) Management Company Limited | Households | 2006 |
| Blubambu Living Limited | Wholesale & retail | 2014 |
| Bluebell at Bingham Management Company Limited | Households | 2012 |
| Bluebell Manor Residential Management Company Limited | Households | 2020 |
| Bluebell Wood (Willenhall) Management Company Limited | Households | 2018 |
| Blunsdon Chase Management Company Limited | Households | 2017 |
| Blunt Plastering Ltd | Construction | 2025 |
| Blythe House Management Company Limited | Households | 2022 |
| Blythe Valley Management Company Limited | Households | 2020 |
| Blythswood Court (Barton) Limited | Households | 1975 |
| BMD Services Ltd | Construction | 2019 |
| Boateek Ltd | Manufacturing | 2023 |
| Bolton Studios Management Limited | Real estate | 2013 |
| Books & Balance Accounts Limited | Professional & scientific | 2024 |
| Boothroyd Management Limited | Households | 2001 |
| Borough View Apartments Management Company Limited | Households | 2016 |
| Borough View Management Company Limited | Households | 2014 |
| Boss Cars Ltd | Wholesale & retail | 2023 |
| Bosworth Court (Lichfield) Management Company Limited | Households | 2003 |
| Boughton Wharf (Rugby) Management Company Limited | Households | 2006 |
| Boujee LOX Ltd | Other services | 2024 |
| Boundary Brook (Harborne) Management Company Limited | Households | 2007 |
| Boundless Properties Limited | Real estate | 2023 |
| Bournemouth Hotels Group Limited | Hospitality | 2021 |
| Bournemouth Tattoo Ltd | Other services | 2022 |
| Bowbrook Meadows (Shrewsbury) Management Company Limited | Households | 2015 |
| Bowds House Management Company Limited | Households | 2020 |
| Boyd Property Holdings Ltd | Real estate | 2022 |
| Bracebridge Manor (Bracebridge Heath) Managing Company Limited | Professional & scientific | 2020 |
| Brambleside Management Company Limited | Households | 2019 |
| Bramhall Oaks Management Company Limited | Households | 1998 |
| Bramley Road (Aylesbury) Residents Company Ltd | Households | 2014 |
| Brampton Park Parcel C (Brampton) Managing Company Limited | Professional & scientific | 2020 |
| Bramshall Green Management Company Limited | Households | 2018 |
| Brand Bamboo Limited | Professional & scientific | 2011 |
| Brand Bamboo Marketing LLP | | 2025 |
| Branston Leas Estate Management Company Limited | Households | 2015 |
| Brearley Court (Highcliffe) Limited | Households | 1998 |
| Breeze Management Limited | Households | 2022 |
| Bridge Road (Breme Park) Management Company Limited | Households | 2006 |
| Bridgewater Gardens (Runcorn) Management Company Limited | Households | 2014 |
| Bright Sky Installations Ltd | Construction | 2026 |
| Bright Water Consultancy Ltd | Professional & scientific | 2025 |
| Brightstar Fires Ltd | Extraterritorial | 2023 |
| Brimington Heights (Brimington) Managing Company Limited | Professional & scientific | 2022 |
| Brislington on the Brook (Bristol) Building Management Company Limited | Households | 2021 |
| Brislington on the Brook (Bristol) Residents Management Company Limited | Households | 2021 |
| Broadbridge Heath Horsham Limited | Real estate | 2016 |
| Broadbridge Management Company Limited | Households | 2013 |
| Brock Meadow (Wickford) Management Company Ltd | Real estate | 2013 |
| Brockenhurst Riding Stables Limited | Arts & recreation | 2013 |
| Brockeridge Road (Twyning) Resident Management Company Limited | Households | 2017 |
| Brockhampton Manor Management Company Limited | Households | 2020 |
| Brockhills Cat Centre Limited | Professional & scientific | 2005 |
| Brockhills Cattery Limited | Other services | 2017 |
| Brook Lane (Chester) Management Limited | Households | 2003 |
| Brook View (Leigh) Management Company Limited | Households | 2021 |
| Brook View (Wixams) Residents Management Company Limited | Households | 2021 |
| Brooklyn Court Management Company Limited | Households | 1983 |
| Brookthorpe Park Management Company Limited | Extraterritorial | 2022 |
| Brookvale Court (Newbury) Management Company Limited | Households | 2008 |
| Broom Gardens Management Company Limited | Households | 2013 |
| Broomheath Lane (Tarvin) Management Company Limited | Real estate | 2006 |
| Brougham Walk Management Company Limited | Households | 1985 |
| Broughton Chase Management Company Limited | Households | 2008 |
| Broughton Gate (Milton Keynes) Management Company Limited | Households | 2009 |
| Broughton Mews (Milton Keynes) Management Company Limited | Households | 2010 |
| Brue Reach (East Huntspill) Management Company Limited | Households | 2022 |
| Brunel Gardens (Barry) Management Company Limited | Households | 2002 |
| Brunel Quay NO. 1 Management Company Limited | Households | 1991 |
| Brynards Park Apartments Management Company Limited | Households | 2016 |
| Brynards Park Development Management Company Limited | Households | 2015 |
| Brynards Park Management Company Limited | Households | 2011 |
| Bryngwyn Village Management Company Limited | Households | 2005 |
| Bucegi Milton Limited | Wholesale & retail | 2025 |
| Buckby Grange at Burton Latimer Management Company Limited | Households | 2016 |