| Arranged Film Limited | Arts & recreation | 2020 |
| Artengi Ltd | Professional & scientific | 2022 |
| Arty's Enterprises Ltd | Financial services | 2023 |
| Arty's Mold Ltd | Hospitality | 2023 |
| Arwand Properties Limited | Real estate | 2025 |
| Ashgrove Management (Caerwys) Limited | Households | 2011 |
| Ashton People Solutions Ltd | Administrative & support | 2026 |
| Asia Sensation Limited | Hospitality | 2018 |
| Asinstudio Ltd | Manufacturing | 2020 |
| Aska Swimming Limited | Arts & recreation | 2009 |
| Askmarc Ltd | Administrative & support | 2020 |
| Aspect Woodworks Limited | Construction | 2017 |
| Aspire to Inspire Fitness Ltd | Other services | 2020 |
| Assisted Living (Properties) Limited | Real estate | 1998 |
| Astonspares Ltd | Manufacturing | 2025 |
| Athena Health Consultancy (UK) Limited | Health & social care | 2015 |
| ATO Insight Solutions Ltd | Information & communication | 2026 |
| ATV Engineering (North Wales) Ltd | Professional & scientific | 2022 |
| Auritus Digital Limited | Information & communication | 2017 |
| Aurora Property Developments Limited | Households | 2016 |
| Aurore Rowlands Consulting Limited | Professional & scientific | 2024 |
| Autoflock Ltd | Professional & scientific | 2008 |
| Autolodge Hotel Limited | Financial services | 1991 |
| Automotive Windscreens Limited | Wholesale & retail | 1987 |
| AW Coatings Ltd | Manufacturing | 2023 |
| B & D Healthcare Limited | Wholesale & retail | 2019 |
| B. L. Farrier Supplies Limited | Administrative & support | 2005 |
| Babaji UN Limited | Information & communication | 2015 |
| Baibua Thai Massage Limited | Other services | 2018 |
| BAM Pharma Ltd | Manufacturing | 2025 |
| Barcymru Ltd | Wholesale & retail | 2010 |
| Bardon Properties Limited | Real estate | 2015 |
| Barlows Caravan Park Limited | Hospitality | 2003 |
| Barnard Engineering Ltd | Professional & scientific | 2016 |
| Barnard Publishing Ltd | Information & communication | 2022 |
| Barraclough House (Mold) Management Company Limited | Hospitality | 2006 |
| Barrington Property Inspections Limited | Professional & scientific | 2008 |
| Barry Davies 88 Limited | Construction | 2018 |
| Barry Davies Construction Limited | Construction | 2023 |
| Barry Evans CYF | Construction | 2011 |
| Barso Environmental Limited | Manufacturing | 2009 |
| BEE Present CIC | Health & social care | 2022 |
| Belle Creative Ltd | Professional & scientific | 2024 |
| Bellflower Consulting Limited | Professional & scientific | 2021 |
| Bennett Elec Ltd | Construction | 2025 |
| Berry and George Ltd | Real estate | 2023 |
| Bespoke Home and Garden Solutions Ltd | Administrative & support | 2024 |
| Better Boats Limited | Manufacturing | 2022 |
| Beverley Haslam Limited | Professional & scientific | 2012 |
| Bevy DEV Consulting UK Ltd | Information & communication | 2023 |
| BH Refreshments Ltd | Hospitality | 2024 |
| Big Ideas Consulting Ltd | Wholesale & retail | 2014 |
| Biggie Ltd | Wholesale & retail | 2022 |
| Biggos Limited | Financial services | 2021 |
| Birch Tree Associates Limited | Professional & scientific | 2024 |
| Birchfield ISO Solutions Limited | Professional & scientific | 2024 |
| Birksy Limited | Professional & scientific | 2017 |
| Bitstepper Ltd | Information & communication | 2018 |
| Black Bull Farm Shop Ltd | Hospitality | 2025 |
| Black Hart Estates Ltd | Real estate | 2026 |
| Black Mountain Honey Limited | Agriculture & fishing | 2020 |
| Black Mountain Retreat Ltd | Hospitality | 2024 |
| Black Patch Ltd. | Information & communication | 2013 |
| Blackbrook Property Ltd | Real estate | 2026 |
| Blasus Iawn Limited | Wholesale & retail | 2025 |
| Bliss Lingerie Ltd | Wholesale & retail | 2019 |
| Blodwen NEL CYF | Wholesale & retail | 2022 |
| Blue Acorn Properties Limited | Real estate | 2016 |
| Blue Banyan Trading Ltd | Wholesale & retail | 2015 |
| Blue FOX UK Limited | Wholesale & retail | 2001 |
| Blue Frog Limited | Wholesale & retail | 2020 |
| Bluebell Care at Home Ltd | Health & social care | 2014 |
| Bluefish Intelligence Limited | Information & communication | 2011 |
| Bluesky Helicopter Maintenance Ltd | Manufacturing | 2018 |
| Bluestone Key Properties Ltd | Real estate | 2019 |
| BOD Homes Limited | Real estate | 2011 |
| BOD Hotels Ltd | Real estate | 2016 |
| BOD Hyfryd Developments Limited | Real estate | 1986 |
| BOD of a GOD Ltd | Extraterritorial | 2023 |
| BOD Property Management Limited | Real estate | 2012 |
| Bonomo Limited | Wholesale & retail | 2021 |
| Bookhopper.Com Ltd | Financial services | 2006 |
| Boundary Parks Limited | Hospitality | 1980 |
| Bowyer Homes Ltd | Construction | 2015 |
| Braecrest Limited | Real estate | 1998 |
| Brand Sponsor Limited | Wholesale & retail | 2025 |
| Brew Mechanics & Co Ltd | Wholesale & retail | 2025 |
| Brian Davies Limited | Construction | 2008 |
| Briar-Grove Developments Limited | Construction | 2005 |
| Brodwaith Cyfyngedig | Manufacturing | 2003 |
| Bromfield Group Limited | Manufacturing | 1993 |
| Bromfield Installations Limited | Construction | 2014 |
| Bron Biddle Associates Limited | Professional & scientific | 2025 |
| Brook Park Farm Cattery Ltd | Other services | 2019 |
| Brooknorth Limited | Information & communication | 2015 |
| Brownbrook Holsteins Ltd | Agriculture & fishing | 2023 |
| Bryan Jones Associates Limited | Professional & scientific | 2003 |
| Bryn Difyr Ltd | Other services | 2022 |
| Bryn Heeley Leadership Ltd | Education | 2022 |
| Bryn Talog Limited | Agriculture & fishing | 2020 |