| Blossom Hill Equestrian Ltd | Grimsby | 2021 |
| Blossom Hill Equestrian Training and Sales Ltd | Grimsby | 2023 |
| Blossom Life Limited | London | 2015 |
| Blossom Tree Specialist Limited | Glasgow | 2025 |
| Blossoms (N.I.) Limited | Larne | 2019 |
| Blounce Farms Limited | Cheltenham | 1997 |
| Blowan Croft Limited | Beverley | 2025 |
| Bloye Farms Limited | Gunnislake | 2023 |
| BLP Equestrian Ltd | Waterlooville | 2025 |
| BLT Logistics Limited | Worcester | 2018 |
| BLU Revolution Limited | Sittingbourne | 2018 |
| Blucka Ltd | Burton-On-Trent | 2025 |
| Blue & Williams Limited | Sutton Coldfield | 2025 |
| Blue (Eco) Ltd | Derby | 2021 |
| Blue Anchor Fishing Ltd | Newton Abbot | 2026 |
| Blue Barns Poultry Farms Limited | Rowlands Gill | 2010 |
| Blue Barns Pullet Rearing Limited | Rowlands Gill | 2022 |
| Blue Bond Accelerator Limited | Redhill | 2025 |
| Blue Box Self Storage (Coleshill) Limited | Orpington | 2015 |
| Blue BOY Limited | Colchester | 2002 |
| Blue Bury Farm Ltd | Norwich | 2019 |
| Blue Cable Bloodstock Ltd | Stafford | 2025 |
| Blue Candi LAB London Ltd | Oxford | 2018 |
| Blue Carbon Solutions Limited | Gorebridge | 2024 |
| Blue Chip Wood Fuels Ltd | Berwick-Upon-Tweed | 2023 |
| Blue Diamond Stud Farm (UK) Limited | London | 2018 |
| Blue Eagle Farm CIC | Riseley | 2026 |
| Blue Falcon - Mark Robb Ltd | Ferryhill | 2010 |
| Blue Ferret Limited | Crook | 2021 |
| Blue Fuchsia Ltd | Gloucester | 2009 |
| Blue Highlands Raptor Rescue & Avian Conservation Centre Ltd | Brora | 2020 |
| Blue Horizon Carpentry & Building Ltd | Ilfracombe | 2026 |
| Blue Horizon Fishing Limited | Brixham | 2025 |
| Blue Horizon Global Ltd | Bedford | 2023 |
| Blue Light Fisheries Limited | Eastbourne | 2024 |
| Blue Lobster Fishing Ltd | Montrose | 2022 |
| Blue Maritime Engineering Ltd | Fraserburgh | 2019 |
| Blue Marlin Fishing Limited | Isle Of Barra | 2019 |
| Blue Merle Limited | Ashbourne | 2002 |
| Blue Monkey Tribe Ltd | Bicester | 2020 |
| Blue Motion Fishing Co. Limited | Fortrose | 2009 |
| Blue Nurseries Limited | Pinner | 2011 |
| Blue Oak Rural Contracting Limited | Swadlincote | 2025 |
| Blue Rebel Ltd | Burra | 2013 |
| Blue Ribbon Plants Ltd | Chichester | 2021 |
| Blue Ridge Solutions Limited | Doncaster | 2016 |
| Blue Sands Foundation | Deeside | 2022 |
| Blue Sett Ltd | Kendal | 2020 |
| Blue Sky Fishing Ltd | Edinburgh | 2017 |
| Blue Sky Home Build Limited | Wisbech | 2018 |
| Blue Stream Aquaponics Farm Limited | London | 2021 |
| Blue Thunder 68 Limited | Newton Abbot | 2024 |
| Blue Water 500 Ltd | London | 2025 |
| Blue Water Farm Limited | Petworth | 2021 |
| Blue Water Fishing Limited | West Midlands | 1997 |
| Blue Wave Fisherier Ltd | Todmorden | 2024 |
| Blue Wing Olive Ltd | Ringwood | 2021 |
| Blue-Green Advisors Limited | Whitehills Business Park | 2017 |
| Bluebell Farm (Kent) Limited | Bromley | 2018 |
| Bluebell Farms Ltd | Peterborough | 2006 |
| Bluebell Lakes Limited | Peterborough | 2023 |
| Bluebell Paws Retreat Ltd | Liverpool | 2025 |
| Bluebird Inspire CIC | Leeds | 2025 |
| Bluegate Hall Farms Limited | Braintree | 2000 |
| Bluegreen Conservation Ltd | Beauly | 2025 |
| Bluehills Farm Ltd | Stewartstown | 2018 |
| Bluehouse Farm (Pitsea) Limited | London | 1962 |
| Bluejay Dogwellness Ltd | Reading | 2023 |
| Blueoak Equestrian Ltd | Craigavon | 2025 |
| Blueprint Planning Ltd | Barry | 2024 |
| Blueribbon Investments & Holding Company Limited | London | 2025 |
| Blueriver Faclities Managment Ltd | Great Dunmow | 2023 |
| Blueroof Limited | Leicestershire | 2004 |
| Blueshell Mussels Limited | Brae | 2003 |
| Bluestone Agricultural Service Ltd | Hull | 2024 |
| Bluestone Farming Ltd | Duns | 2015 |
| Bluestone Vineyard Ltd | Cholderton | 2016 |
| Bluetang UK Ltd | Gloucester | 2010 |
| Blueterra Ltd | Hastings | 2025 |
| Bluevo Limited | Ecton | 2023 |
| Bluewater Lakes France Ltd | Basildon | 2024 |
| Bluewu Industry Limited | Cardiff | 2021 |
| Bluey Enterprise Ltd | Liverpool | 2024 |
| Bluez Bruvers Limited | Bournemouth | 2025 |
| Blugreens Ltd | Plymouth | 2020 |
| Blundells Fishery Limited | Stockport | 2013 |
| Blundeston House Farm Ltd | Lowestoft | 2019 |
| Blurton Poupard Hoof Care Products Limited | Welshpool | 2024 |
| Blush Botanique Ltd | London | 2026 |
| Bluvabullz Limited | Cardiff | 2019 |
| Blyth Farm Services Limited | Gainsborough | 1983 |
| Blyth Farms Limited | Thrussington | 1937 |
| Blyth Livestock Advisor Services Limited | Chichester | 2018 |
| Blyth Model Dairies Limited | Chichester | 1963 |
| Blyth Star Enterprises Limited | Blyth | 1987 |
| Blythburgh Estate | Saxmundham | 2009 |
| Blythe Bridge Hall Farm Limited | Ashbourne | 2013 |
| Blythmarsh Canine Limited | Stone | 2021 |
| BM Biotech Ltd | Newport Pagnell | 2019 |
| BM Fishing Company Ltd | Newry | 2011 |