| BAE Systems (Operations) Limited | Camberley | 1986 |
| BAE Systems GCS International Limited | Camberley | 2019 |
| BAE Systems Global Combat Systems Munitions Limited | Camberley | 1984 |
| BAE Systems Marine Limited | Camberley | 1928 |
| BAE Systems PLC | London | 1979 |
| BAE Systems Surface Ships International Limited | Camberley | 2002 |
| BAE Systems Surface Ships Limited | Camberley | 2007 |
| Baeboxuk Ltd | London | 2025 |
| Baed Natural Body Care Ltd | Bath | 2022 |
| Baerlocher UK Limited | Lancashire | 1973 |
| BAF Motorsport Limited | Wakefield | 2017 |
| BAF Printers (1962) Limited | Leeds | 2011 |
| BAF Valves Limited | Hamilton | 1991 |
| Bafashionsuk Ltd | Rochdale | 2024 |
| Baff Candle Limited | London | 2023 |
| Baffi Coffee Company Ltd | Eastleigh | 2025 |
| Baffle Acoustics Ltd | Macclesfield | 2024 |
| Baffle Box Games Ltd | London | 2023 |
| BAG Ette ME NOT Ltd | Middlesbrough | 2021 |
| BAG for Dunya Ltd | Romford | 2026 |
| BAG IT Don`T BIN IT Limited | Sheffield | 2007 |
| BAG Kraft Ltd | Westbury | 2025 |
| Bagamuffin Limited | London | 2023 |
| Bagco Limited | Sheffield | 2002 |
| Bagel and Pastries Ltd | Chatham | 2024 |
| Bagel House Brothers Ltd | London | 2019 |
| Bagel Palace Ltd | Brighton | 2017 |
| Bagel Stop Ltd | Hayes | 2019 |
| Bagels + Schmear (Retail) Ltd | London | 2022 |
| Bagels + Schmear Ltd | London | 2020 |
| Bageriet Ltd | London | 2011 |
| Bagform International Ltd | Loughborough | 2022 |
| Bagga Ltd | Nottingham | 2019 |
| Baggie Pro Ltd | London | 2023 |
| Baggleys Machinery Limited | Norwich | 2023 |
| Baggonnt Ltd | Edinburgh | 2026 |
| Baghdad Jewellery Ltd | London | 2024 |
| Bagin Ecom Ltd | London | 2025 |
| Baglady Limited | London | 2021 |
| Baglan Bakery Limited | Port Talbot | 2018 |
| Baglan Joinery Ltd | Uxbridge | 2017 |
| Baglogix Limited | Basildon | 2007 |
| Bagman and Robin Ltd | Barnet | 2004 |
| Bagman Ltd | London | 2024 |
| Bagmaster Ltd | London | 2026 |
| Bagnall Construction Limited | Stone | 1989 |
| Bagnalls Engineering Limited | Burton-On-Trent | 2009 |
| Bagpad Limited | London | 2018 |
| Bagpress Limited | Rushden | 2002 |
| Bagri Automotive Developments Limited | London | 2021 |
| Bags 4 Everything Limited | Ossett | 2014 |
| Bags and Boxes Ltd | Hanworth | 2019 |
| Bags and Covers Direct Limited | Wakefield | 2014 |
| Bags by UMA Ltd | London | 2025 |
| Bags of Beans Limited | Blackburn | 2007 |
| Bags Wonder Full Ltd | London | 2021 |
| BAGS2COVER Ltd | Loughborough | 2003 |
| Bagshaw Engineering Ltd | Nuneaton | 2021 |
| Bagsport Fabrications Ltd | Woking | 2022 |
| Bagswithnoname Ltd | London | 2025 |
| Baguette Sandwich Limited | London | 2023 |
| Bagvack Ltd | London | 2025 |
| Bagwan Limited | Wembley | 2025 |
| Bagworld Bespoke Bags Ltd | Redditch | 2017 |
| Bahaar Kitchen UK Limited | Cardiff | 2020 |
| Bahadur & SON Ltd | London | 2016 |
| Bahama Beach Ltd | Edinburgh | 2024 |
| Bahar Dessert Ltd | London | 2025 |
| Bahar Soft Icecream Limited | London | 2025 |
| Baharash Electrical Contractor Ltd | Twickenham | 2024 |
| Bahareth Space Industries Limited | London | 2025 |
| Bahari Lifestyle Ltd | London | 2022 |
| Baharia Tech Ltd | Liverpool | 2020 |
| Baharistan Ice Cream Ltd | Wembley | 2024 |
| Bahashti Naan Shop Ltd | Birmingham | 2019 |
| Bahloo & YHI Ltd | Eastbourne | 2026 |
| Bahn Sportive Ltd. | Bedale | 2023 |
| Bahnno Group Ltd | London | 2021 |
| Bahoma Limited | Hampton Wick | 2006 |
| Bahson Colour Print Limited | Wakefield | 1996 |
| Bahta Cleaning Service Ltd | London | 2026 |
| BAI Mengyao Group Limited | Beckenham | 2025 |
| Baichuan Import and Export Co., Ltd | Cambridge | 2017 |
| Baifield Fabrications Limited | Eastleigh | 2014 |
| Baigari Ltd | Welling | 2025 |
| Baihe Medical (UK) Ltd | Welling | 2024 |
| Baihua Zhou Technology Co., Ltd | West Midlands, England | 2025 |
| Baikie Clothing Co Ltd | Surbiton | 2021 |
| Bailey & Mackey Limited | | 1987 |
| Bailey & Moon Ltd | Kington | 2022 |
| Bailey & Sons Limited | Derby | 1954 |
| Bailey & Stone Limited | Great Yarmouth | 2015 |
| Bailey & Wade Engineering Co Limited | Coventry | 1975 |
| Bailey Acoustics Limited | Stoke On Trent | 2019 |
| Bailey Bridge Marina Ltd | Christchurch | 2021 |
| Bailey Caravans Limited | Bristol | 1939 |
| Bailey Custom Auto Trims Ltd | Southend-On-Sea | 2022 |
| Bailey CW Limited | Horsham | 2025 |
| Bailey Decal Limited | Stoke On Trent | 2007 |
| Bailey Elevator Services Limited | Caerphilly | 2010 |