| Baram African Foods and Drinks Ltd | Gaerwen | 2025 |
| Baran Catering Services Ltd | Ipswich | 2021 |
| Baran Commercial Furniture Ltd | Wembley | 2025 |
| Baran Ltd | Twickenham | 2023 |
| Baran Meat Ltd | London | 2024 |
| Baranda Ltd | Liverpool | 2020 |
| Barassie Limited | Cleckheaton | 2009 |
| Barat Alte UK Limited | Alfreton | 2024 |
| Barattucci Ltd | London, | 2022 |
| Baravelli's Ltd | Conwy | 2011 |
| Barb's Free From Cakes Limited | Bournemouth | 2025 |
| Barbacoa Ltd | Clyst Honiton, Exeter | 2021 |
| Barball Limited | Chippenham | 2024 |
| Barbara Bell Ltd | Edinburgh | 2025 |
| Barbara Fielding Knitwear Limited | Lutterworth | 1979 |
| Barbara Kopec Ltd | Thornton Heath | 2026 |
| Barbara Mawer Enterprises Limited | Penzance | 2021 |
| Barbara Scott Aromatics Ltd | Bridport | 2017 |
| Barbara Tipple Jewellers Limited | Portsmouth | 2016 |
| Barbaris Ltd | London | 2015 |
| Barbary Technicals Ltd | East Cramlington | 2020 |
| Barbastelle Ltd | Melksham | 2018 |
| Barbe & Bald Limited | Dorchester | 2002 |
| Barbel Concrete Company Limited | Cheltenham | 1984 |
| Barbeline Ltd | Islington | 2014 |
| Barbelo Limited | Kent | 2002 |
| Barber & Bonds Ltd | Droitwich Spa | 2020 |
| Barber and Clarke Limited | Borehamwood | 1998 |
| Barber Healthcare Limited | Middlesbrough | 2007 |
| Barber Osgerby (CY) Limited | London | 2019 |
| Barber Osgerby Limited | London | 2006 |
| Barber,Wilsons and Company Limited | Wood Green | 1908 |
| Barbers Bees Ltd | Harleston | 2025 |
| Barbery Limited | Shepton Mallet | 2004 |
| Barbestica Ltd | Halifax | 2022 |
| Barbican City Studio Limited | Cheshunt | 2002 |
| Barbican Composite Doors Limited | Ilkeston | 2019 |
| Barbican Property Maintenance Solution Ltd | Greenhithe | 2020 |
| Barbie'Smetalmagic Ltd | London | 2025 |
| Barbos Space Limited | London | 2025 |
| Barbosa Hoffmann Ltd | Bishops Stortford | 2024 |
| Barbosa Maciel Ltd | Liverpool | 2025 |
| Barbour (Liddesdale) Ltd | Tyne And Wear | 1978 |
| Barbour ALL Terrain Tracking Ltd | Berwick-Upon-Tweed | 2000 |
| Barbour Marine Ltd | North Berwick | 2023 |
| Barboxes Ltd | Winchester | 2022 |
| Barbu Sandrei Ltd | Cambridge | 2024 |
| Barbélotte Ltd | Mildenhall | 2024 |
| Barcam Limited | Guildford | 2004 |
| Barcel Snacks UK Limited | Mexborough | 2023 |
| Barcelinebabes Ltd | Norwich | 2025 |
| Barcelinemarketingmedia Ltd | Norwich | 2025 |
| Barcelona Design Works Ltd | Burnley | 2025 |
| Barcelona Spirit Brands UK Limited | London | 2015 |
| Barchen Coffee Ltd | Hove | 2025 |
| Barcl Ltd | London | 2026 |
| Barclay & Mathieson Limited | Glasgow | 1955 |
| Barclay (Cammachmore) Limited | Skelmersdale | 1990 |
| Barclay Ballard Ltd | Barnet | 2021 |
| Barclay Control Systems Limited | East Kilbride | 2021 |
| Barclay Developments Limited | Buckhurst Hill | 2007 |
| Barcley Tarpaulin Limited | Romford | 2012 |
| Barcode Energy Limited | Leicester | 2024 |
| Barcode Outsource Ltd | Burghfield | 2025 |
| Barconwood Limited | Bury St. Edmunds | 2005 |
| Barcwagen Ltd | Glasgow | 2025 |
| Bard & Brazier Limited | Hoddesdon | 1979 |
| Bard Limited | Crawley | 1968 |
| Bard Pharmaceuticals Limited | Cambridge | 1970 |
| Bardeen Ltd | Sandy | 2025 |
| Barden Aerospace (UK) Limited | Plymouth | 2023 |
| Barden Biomass Limited | Carnforth | 2016 |
| Barden Corporation (UK) Limited | Plymouth | 2023 |
| Barden Refrigeration Services Oxford Limited | Brackley | 2014 |
| Barden Super Precision Bearings Limited | Plymouth | 2023 |
| Bardex Energy UK, Limited | Boldon Colliery | 2023 |
| Bardinet Digital Services Limited | Deal | 2019 |
| Bardney Investments Ltd | Lincoln | 2009 |
| Bardney LA Boulangère Limited | London | 2025 |
| Bardo Ventures Ltd | London | 2022 |
| Bardouille Services Ltd | Wilsden | 2018 |
| Bardown Barbeque Limited | Hockley | 2019 |
| Bardsley Bespoke Interiors Limited | Stockport | 2020 |
| Bardy Group Limited | London | 2020 |
| Bardyke Chemicals Limited | Glasgow | 1968 |
| Bare and Bloom Ltd | Cambridge | 2021 |
| Bare Baked Ltd | Glenrothes | 2022 |
| Bare Bones Chocolate Ltd | Glasgow | 2018 |
| Bare Branding C.I.C. | Edinburgh | 2018 |
| Bare Goodness Limited | Croydon | 2018 |
| Bare Ice London Ltd | Wembley | 2019 |
| Bare Knuckle Boxing Magazine Ltd | Welwyn Garden City | 2018 |
| Bare Knuckle Pickups Limited | Devon | 2003 |
| Bare Native Ltd | Colchester | 2019 |
| Bare Studio Ltd | London | 2014 |
| Bare Wash Ltd | London | 2026 |
| Bare+ Limited | London | 2025 |
| Barebeard Ltd | Coventry | 2020 |
| Barebones Guitar Amplification Ltd | London | 2018 |
| Bareboss Ltd | Gosport | 2021 |