| BY Victoria Beauty Ltd | Cambridge | 2026 |
| BY Volume Ltd | London | 2013 |
| BY Zeddam Ltd | London | 2025 |
| BY ZOE Beauty Academy Ltd | Cardiff | 2025 |
| BY. Stephen Cherry Limited | Basildon | 2019 |
| By.Tenieka Ltd | Manchester | 2025 |
| By.Vrose Limited | London | 2025 |
| BY0 Finchley Ltd | London | 2025 |
| Byameeera Ltd | Sheffield | 2026 |
| Byanchor Ltd | London | 2024 |
| Byanchorproducts Ltd | London | 2026 |
| Byara Ltd | Alexandria | 2019 |
| Byareli Ltd | London | 2026 |
| Byars Ltd | Ilford | 2019 |
| BYB Storage & Promotions Limited | Ilkeston | 2021 |
| Bybaefii Ltd | Plymouth | 2026 |
| Bybecky. Ltd | Greenhithe | 2026 |
| Bybels Ltd | Dartford | 2025 |
| Byberfin Aesthetics Ltd | Enfield | 2026 |
| Bybethanyellentaylor Ltd | Beccles | 2026 |
| Byblos Services Limited | London | 2007 |
| Bybrook Physiotherapy Limited | Tetbury | 2017 |
| Bycentral Limited | Swanley | 2003 |
| Bychloelew Ltd | County Durham | 2025 |
| Bycoh Ltd | Huddersfield | 2026 |
| BYD Bach CIC | Caernarfon | 2024 |
| Byda TEC Limited | Eastbourne | 2026 |
| Byde Brook Clinic Ltd | Nr Chippenham | 2010 |
| Bydeeaesthetics Ltd | London | 2025 |
| Bydian Ltd | Barking | 2023 |
| BYE Cat Fish Ltd | Leigh-On-Sea | 2023 |
| BYE the Bridge Gym Ltd | Keighley | 2026 |
| BYE to Cancer | Wolverhampton | 2011 |
| Byebrue Boarding Kennels & Cattery Limited | Halesworth | 2019 |
| Byerim Retail Ltd | London | 2026 |
| Byers Brae Electrical Ltd | Dundee | 2017 |
| Byers Doggy Care Ltd | Farnham | 2016 |
| Byers Management Limited | Woodbridge | 2012 |
| Byfashion Ltd | London | 2025 |
| Byfield Consultancy Limited | Canvey Island | 2006 |
| Byfleet Boat Club Limited(The) | West Byfleet Surrey | 1976 |
| Byfords Building Repairs Ltd | Southend-On-Sea | 2017 |
| Byfrankie Limited | Dorset | 2025 |
| Byhasanat Ltd | Brentford | 2020 |
| Byhome Limited | Newcastle Upon Tyne | 2000 |
| Byjen Academy Ltd | Sunderland | 2024 |
| Byjess Aesthetics Limited | Bury St Edmunds | 2022 |
| Byjh Holdings Limited | London | 2026 |
| Bykala Limited | Chester | 2006 |
| Bykateanna Ltd | Ossett | 2025 |
| Bykatevictoria Ltd | Wotton-Under-Edge | 2026 |
| Bykaytonjl Limited | Sutton Coldfield | 2024 |
| Byker Beauty Parlour Ltd | Newcastle Upon Tyne | 2022 |
| Byker-It Ltd | Newcastle Upon Tyne | 2024 |
| Byland Close (Winchmore Hill) Limited | London | 1995 |
| Bylauriefern Ltd | Liverpool | 2017 |
| Bylouie Hair and Makeup Ltd | Hull | 2021 |
| Bymadielin Ltd | North Shields | 2025 |
| Bymarisia Ltd | London | 2026 |
| Bymb Limited | Broadstairs | 2020 |
| Bymevish Limited | London | 2024 |
| Bymillian Ltd | London | 2025 |
| Bymilliemay Ltd. | Alfreton | 2024 |
| Bynadine Ltd | Hackney, London | 2026 |
| Bynario Limited | Lochgelly | 2019 |
| Byng House Management Limited | Epsom | 1981 |
| Byokwani Beauty Ltd | Nottingham | 2026 |
| Byond Media Ltd | Ilford | 2023 |
| Byou by Louise Ltd | Chorley | 2019 |
| Byou Global Ltd | London | 2025 |
| Byout Salon Ltd | Ringwood | 2019 |
| Byouty Ltd | London | 2021 |
| Byova Ltd | Harrow | 2024 |
| Bypest Environmental Services Limited | Ashford | 2008 |
| Byprecious Ltd | Birmingham | 2026 |
| BYR Limited | Milton Keynes | 2018 |
| Byrenee Ltd | London | 2023 |
| Byres Barber Ltd | Glasgow | 2026 |
| Byreshair Ltd | Glasgow | 2025 |
| Byrgwm CYF | Carmarthen | 2023 |
| Byrn Ltd | Sheffield | 2022 |
| Byrne & Co Consulting Ltd | Glasgow | 2024 |
| Byrne Aesthetics Limited | Doncaster | 2020 |
| Byrne Hair & Co Limited | Whitstable | 2024 |
| Byrne Holdings Ltd | London | 2013 |
| Byron & Atkinson Physiotherapy Ltd | Ware | 2020 |
| Byron Osteo Limited | London | 2009 |
| Byron Residential Limited | Boldon Colliery | 2021 |
| Byron's Barbers Limited | South Croydon | 2022 |
| Byrsa Capital Services, Ltd | London | 2020 |
| Byru PMU Ltd | Macclesfield | 2024 |
| Byshan Limited | Sutton Coldfield | 2025 |
| Bysighgel Ltd | Manchester | 2020 |
| Bysimbi Ltd | Gravesend | 2025 |
| Bysj Ltd | London | 2025 |
| Bysoph Limited | London | 2025 |
| Bysummah Beauty Ltd | Wolverhampton | 2025 |
| Bysvltana Ltd | Ilford | 2024 |
| Bytaliyahmarrett Ltd | London | 2022 |
| Byte Controls Limited | Summerhill | 2013 |