| Blakes Motivational Fitness Ltd | Arts & recreation | 2025 |
| Blockwell's Transport & Training Ltd | Transport & logistics | 2026 |
| Bloom (Pembs) Ltd | Administrative & support | 2025 |
| Bloom for Mums Ltd | Information & communication | 2026 |
| Blue Arrow Media Limited | Information & communication | 2017 |
| Blue Bean Civil Engineering Limited | Construction | 2023 |
| Blue Community Support Ltd | Health & social care | 2026 |
| Blue Shark Charters Limited | Transport & logistics | 2013 |
| Bluelans Tecology Co., Ltd | Wholesale & retail | 2023 |
| Blueskai International Limited | Administrative & support | 2024 |
| Bluesky Legal Finance & Management Solutions Ltd | Professional & scientific | 2024 |
| Bluestone Minerals Ltd | Mining & quarrying | 2016 |
| Bluestreak Developments Limited | Construction | 2004 |
| Board Games Surfing Limited | Arts & recreation | 2013 |
| Bobcom Lettings Limited | Real estate | 2025 |
| Boia CIC | Arts & recreation | 2026 |
| Boiler Solutions Cover UK Ltd | Construction | 2020 |
| Bold & Subtle Limited | Professional & scientific | 2025 |
| Boulcott Farms Limited | Administrative & support | 2009 |
| Boulston Advisory Ltd | Professional & scientific | 2025 |
| Bowen Residential Ltd | Real estate | 2026 |
| Bowett Farm Limited | Agriculture & fishing | 2003 |
| Bowlings Livery and Education Limited | Agriculture & fishing | 2023 |
| Bowlings Riding School Limited | Agriculture & fishing | 2023 |
| Bown & Bugler Enterprises Limited | Wholesale & retail | 2026 |
| BPM Catering Supplies Ltd | Wholesale & retail | 2024 |
| Brand Performance Limited | Other services | 2004 |
| Brawdy Farm Retreats Ltd | Hospitality | 2018 |
| Breakout Gallery CIC | Arts & recreation | 2025 |
| Breakout World Limited | Extraterritorial | 2001 |
| Breen & Rowe Limited | Construction | 2007 |
| Brian Price Electrics Ltd | Construction | 2010 |
| Brimbyrne Gower Villa Ltd | Construction | 2022 |
| Brimgreen Limited | Extraterritorial | 2010 |
| Bringer of Light Ltd | Administrative & support | 2024 |
| Bringold Limited | Real estate | 2005 |
| Bristol Trader | Hospitality | 2003 |
| Bristworld Ltd | Extraterritorial | 2025 |
| BRO Blades Ltd | Other services | 2018 |
| Broad Haven Holiday Park Limited | Hospitality | 2003 |
| Brompton Park Farm Limited | Agriculture & fishing | 2003 |
| Bronzelion Limited | Hospitality | 2009 |
| Brothers House (Haverfordwest) Limited | Wholesale & retail | 2017 |
| Bruce Architecture Limited | Professional & scientific | 2016 |
| Bryce & Co Estates Limited | Real estate | 2023 |
| Brynawelon Publishing Ltd | Information & communication | 2023 |
| BU Real Estate Ltd | Extraterritorial | 2024 |
| BUG Farm Foods Ltd | Manufacturing | 2017 |
| Builders Crown Limited | Arts & recreation | 1989 |
| Building Happiness Ltd | Extraterritorial | 2024 |
| Bunis Ltd | Other services | 2021 |
| Burlort Limited | Agriculture & fishing | 1988 |
| Buzinet Limited | Information & communication | 2000 |
| Buzitech Ltd | Other services | 2007 |
| Bvdavies Ltd | Construction | 2019 |
| C & P Blinds & Awnings Ltd | Manufacturing | 2018 |
| C T D & C Ltd | Construction | 2019 |
| C.G. Pearce Limited | Administrative & support | 2002 |
| C.M.S. Builders Ltd | Construction | 2011 |
| C.P.Craig & Son(Tenby)Limited | Wholesale & retail | 1964 |
| C.S Machinery Limited | Wholesale & retail | 2013 |
| Cadview Ltd | Construction | 2017 |
| Caen (Pembrokeshire) Limited | Construction | 2021 |
| Caerfai Bay Limited | Arts & recreation | 2002 |
| Caerhys Organic Community Agriculture | Agriculture & fishing | 2013 |
| Caeriad CIC | Agriculture & fishing | 2022 |
| Calafi Ltd | Administrative & support | 2025 |
| Calendula Kraeutergarten Ltd | Extraterritorial | 2023 |
| Caloenergia Heating Systems Limited | Wholesale & retail | 2022 |
| Calon YR Adref Limited | Construction | 2023 |
| Calonik Ltd | Other services | 2018 |
| Calwen Limited | Real estate | 2000 |
| Cambrai Services Limited | Construction | 2019 |
| Caneras Ltd | Other services | 2021 |
| Capestone Farms Limited | Manufacturing | 2022 |
| Capestone Organic Poultry Limited | Agriculture & fishing | 1999 |
| Capital Analysis Limited | Information & communication | 2011 |
| Captiva Holdings Limited | Administrative & support | 2009 |
| Cardiff Poster Printing Ltd | Manufacturing | 2022 |
| Care & Protect Management Ltd | Extraterritorial | 2021 |
| Care and Companionship With Emma Ltd | Health & social care | 2024 |
| Cariad Pet Therapy Community Interest Company | Education | 2018 |
| Carmen Spirit Time Ltd | Administrative & support | 2024 |
| Carreg Catering Ltd | Hospitality | 2020 |
| Carreg Construction Limited | Construction | 2003 |
| Carreg Trustees Limited | Professional & scientific | 2023 |
| Carreg WEN Limited | Construction | 2001 |
| Carrie Watkins Ltd | Arts & recreation | 2019 |
| Carrier Cleaning Contractors Limited | Administrative & support | 2021 |
| Carrier Maintenance Contractors Limited | Construction | 2020 |
| Cartlett Home & Garden Supplies Limited | Wholesale & retail | 1968 |
| Cartlett Road Hand Car Wash Limited | Wholesale & retail | 2024 |
| Cartrefi AJ Homes Ltd | Construction | 2020 |
| Carve Smart Pro Ltd | Manufacturing | 2025 |
| Caskhen Limited | Real estate | 2011 |
| Castaway Caravans Ltd | Hospitality | 2022 |
| Castle Cleaning Services (Pembs) Limited | Administrative & support | 2004 |
| Castleinnlittlehaven Limited | Hospitality | 2018 |
| Cataleia Automotive Ltd | Manufacturing | 2025 |
| Cause Tension Media Ltd. | Information & communication | 2011 |