| Biowreath Ltd | Taunton | 2026 |
| Biox Consultants Limited | Exeter | 1990 |
| Bipin Sankar Associates Ltd | London | 2010 |
| Bipulse Ltd | Haverfordwest | 2023 |
| Biquet Ltd | Newbury | 2016 |
| BIR Dent PVT Ltd | Aberdeen | 2025 |
| Birah Holdings Limited | Northwood | 2026 |
| Birch and Thorn Ltd | Whitley Bay | 2026 |
| Birch Court (Seaton Delaval) Limited | Whitley Bay | 2020 |
| Birch Davison Ltd | Beaminster | 2017 |
| Birch Developments (NW) Ltd | Liverpool | 2014 |
| Birch Environmental (NW) Limited | Liverpool | 2018 |
| Birch Garden Centre Limited | Cheadle | 2022 |
| Birch Green Services Ltd | Worcester | 2020 |
| Birch Media Limited | Wallington | 2010 |
| Birch Projects Limited | Nottingham | 2011 |
| Birch Property Management Limited | Sarisbury Green | 2003 |
| Birch Property Services Ltd | Worthing | 2007 |
| Birch Tree Studios Ltd | Sittingbourne | 2019 |
| Birch Worldwide Limited | Salford | 2002 |
| Birchall Services Limited | Stourport-On-Severn | 2022 |
| Bircham Cardiac Physiology Services Limited | Hemel Hempstead | 2022 |
| Bircham Trees and Landscapes Ltd | King'S Lynn | 2013 |
| Birchco Group Limited | Birmingham | 2021 |
| Birchcroft Park Residents Association (Chaldon) Limited | Caterham | 1989 |
| Birchdane Consulting Ltd | Wrexham | 2012 |
| Birches Homes Ltd | London | 2020 |
| Birchfield Court Residents Webheath Limited | Redditch | 2003 |
| Birchfield Dog Walking and Pet Services Limited | Harrogate | 2017 |
| Birchfield Harriers Limited | Birmingham | 2026 |
| Birchfield Laundrette Ltd | Birmingham | 2017 |
| Birchfield Property Ltd | Manchester | 2018 |
| Birchills Estates Ltd | Brentwood | 2017 |
| Birchington Together CIC | Birchington | 2020 |
| Birchlea Investments Limited | Dalkeith | 2019 |
| Birchmoor(St John's) Community Interest Company | Tamworth | 2013 |
| Birchmoore Limited | Sutton Coldfield | 2023 |
| Birchos Yosef (UK) Limited | Edgware | 2007 |
| Birchtree Cattery Ltd | Newcastle Upon Tyne | 2024 |
| Birchwood (Kent) Limited | Broadstairs | 2003 |
| Birchwood Aesthetics Limited | Chislehurst | 2024 |
| Birchwood Bark Park Ltd | Warrington | 2025 |
| Birchwood Barn | Penrith | 2024 |
| Birchwood Boarding Kennels and Cattery Limited | Alfreton | 2011 |
| Birchwood Construction & Carpentry Limited | Chatham | 2017 |
| Birchwood Evangelical Church | Warrington | 2008 |
| Birchwood Fencing Ltd | Leyburn | 2018 |
| Birchwood Grange Management Company Limited | Lincoln | 1990 |
| Birchwood Home Improvements Limited | Stevenage | 2009 |
| Birchwood Insolvency Ltd | Oldham | 2021 |
| Birchwood Nails Ltd | Lincoln | 2026 |
| Birchwood NW Ltd | Preston | 2012 |
| Birchwood Real Estate Capital Limited | London | 2022 |
| Birchwood Scotland Limited | Glasgow | 2020 |
| Birchwood Tree Services Ltd | Stafford | 2023 |
| Bircom Ltd | London | 2019 |
| Bird & Co Barbershop Limited | Cannock | 2018 |
| Bird & Pestworx Limited | Sale | 2019 |
| Bird Dog Grooming Ltd | London | 2019 |
| Bird Events Ltd | Stanmore | 2020 |
| Bird House Hair and Beauty Ltd | York | 2023 |
| Bird in a Biplane Limited | Hertford | 2011 |
| Bird Luckin Limited | Chelmsford | 1989 |
| Bird Overseas Holdings Limited | London | 2011 |
| Bird Security Consultants Ltd | Chesterfield | 2016 |
| Bird Technologies Services Limited | London | 2025 |
| Birdee Limited | London | 2023 |
| Birdfish Productions Ltd | Bristol | 2015 |
| Birdhouse Renovation Ltd | London | 2014 |
| Birdies Beauty Ltd | Ingatestone | 2021 |
| Birdline-Uk Limited | London | 2006 |
| Birds Family Funeral Directors Limited | Maidstone | 2013 |
| Birds Flyin' Ltd | Maidstone | 2026 |
| Birds of Paradise Talent Management Limited | London | 2025 |
| Birdsfoot Town TUB Ltd | Luton | 2023 |
| Birdswan Solutions Limited | Haywards Heath | 1995 |
| Birdswell Partners Limited | Ilfracombe | 2023 |
| Birdwell Insulation Limited | Sheffield | 1993 |
| Birdwood Veleting Centre Limited | Ilford | 2025 |
| Birfa Ltd | Chepstow | 2016 |
| Birginia Group IBC Limited | Hythe | 2025 |
| Biriayii Limited | London | 2022 |
| Biriwa Self-Help Association UK Ltd | London | 2025 |
| Birkat Hamazon Limited | London | 2025 |
| Birkbeck Counselling Association | London W1N5Pf | 2020 |
| Birkby Couriers Ltd | Huddersfield | 2024 |
| Birkdale Beauty Ltd | Southport | 2019 |
| Birkdale Flats Limited | Bexhill-On-Sea | 1989 |
| Birkenhack Limited | Birkenhead | 2025 |
| Birkenhead Blinds Ltd | Wallasey | 2025 |
| Birkenhead Nails Ltd | London | 2025 |
| Birkinshaw Holdings Limited | Market Rasen | 2024 |
| Birksland Supplies Ltd | Bradford | 2020 |
| Birla Holdings Ltd | Neath | 2023 |
| Birman Consultants Ltd | London | 1996 |
| Birmingham & Solihull Social Economy Consortium C.I.C. | Birmingham | 2012 |
| Birmingham & Solihull Workbased Learning Provider Network Limited | Birmingham | 2006 |
| Birmingham (T) Hairdressing Limited | Alton, Hampshire | 2012 |
| Birmingham (T2) Hairdressing Limited | Alton | 2022 |
| Birmingham Association of Youth Clubs | Birmingham | 2002 |