| Ashe Windows Ltd | Construction | 2017 |
| ASK Emma Digital Accountants Ltd | Extraterritorial | 2016 |
| ASK Emma Payroll Solutions Ltd | Administrative & support | 2018 |
| Asphalt N.W Limited | Construction | 2023 |
| Aspire Health and Beauty Limited | Health & social care | 2003 |
| Asset Recovery Limited | Administrative & support | 2016 |
| Assuredbespokefittedwardrobes.Com Ltd | Construction | 2024 |
| Aston Hughes Limited | Professional & scientific | 2013 |
| Atlantic Vision Limited | Administrative & support | 2011 |
| Aurum Arts Ltd | Wholesale & retail | 2010 |
| Aurum Marketing Limited | Information & communication | 2021 |
| Auto TOW Ltd | Wholesale & retail | 2013 |
| Autohaus Colwyn Bay Limited | Wholesale & retail | 2009 |
| Avax Logistics Ltd | Transport & logistics | 2022 |
| Awel Y MÔR Ltd | Wholesale & retail | 2018 |
| AWM Property Investment Limited | Real estate | 2015 |
| Aysun Food 1 Ltd | Hospitality | 2026 |
| Badri Smilecare Limited | Health & social care | 2016 |
| BAE Waves Ltd | Hospitality | 2025 |
| Bamber Homes Limited | Construction | 2023 |
| Bambw Ltd | Information & communication | 2022 |
| Bangla Leaf Ltd | Hospitality | 2020 |
| Barber Code Ltd | Other services | 2015 |
| Barcdy Caravan Park Limited | Hospitality | 2015 |
| Bay AI Tech Ltd | Information & communication | 2025 |
| Bay Estates Ltd | Real estate | 2021 |
| Baylec Electrical Contractors Ltd | Construction | 2007 |
| Bayman Group Limited | Construction | 2025 |
| BCC Business Ltd | Professional & scientific | 2023 |
| BDI Security Ltd | Administrative & support | 2007 |
| Beach House (Rhos on Sea) Property Company Limited | Households | 2022 |
| Beach Lion Ltd | Other services | 2016 |
| Bear Property Services Limited | Construction | 2018 |
| Beardsalls(North Wales)Limited | Wholesale & retail | 1958 |
| Beepbox Ltd | Manufacturing | 2021 |
| Bellis Media (NW) Limited | Arts & recreation | 2013 |
| Bend IT Limited | Manufacturing | 2008 |
| Bennetts North West Ltd | Wholesale & retail | 2023 |
| Bespoak Woodwork Ltd | Construction | 2025 |
| Beth Music Limited | Arts & recreation | 2022 |
| Bethel Apartments Limited | Hospitality | 2006 |
| BHP North Wales Limited | Construction | 2006 |
| Big Flash Car Wash Ltd | Other services | 2024 |
| Birchmead Management Company Limited | Real estate | 2012 |
| Black Cat Vehicle Hire Limited | Transport & logistics | 2017 |
| Blackwall Consulting Limited | Information & communication | 2014 |
| Blackwall Holdings Limited | Real estate | 2022 |
| Blacoe Haulage Ltd | Transport & logistics | 2025 |
| Blakewaters Consulting Limited | Professional & scientific | 2025 |
| Blisscare and Home UK Ltd | Administrative & support | 2024 |
| Block Management NW Ltd | Real estate | 2023 |
| Blunder of the Year Limited | Arts & recreation | 2023 |
| Bobcats Coffee Limited | Hospitality | 2023 |
| Bocs Self Storage Limited | Administrative & support | 2016 |
| BOD Difyr Management Company Limited | Households | 2006 |
| Bodnant Construction Ltd | Construction | 2023 |
| Bodnant Furnace Farm Ltd | Manufacturing | 2018 |
| Bodnant Garden Nursery Limited | Administrative & support | 1986 |
| Bodnant Joinery Limited | Manufacturing | 2009 |
| Bordervent Ltd | Manufacturing | 2019 |
| Botanical Lounge Ltd | Hospitality | 2023 |
| Boutique Tours of Wales Limited | Transport & logistics | 2019 |
| Bowden Financial Planning Ltd | Financial services | 2012 |
| BPS Painting Services Ltd | Construction | 2023 |
| Braeside Management Company Limited | Hospitality | 2002 |
| Brainally Strategy Ltd | Professional & scientific | 2025 |
| BRANDZYOULOVE2 Ltd | Wholesale & retail | 2021 |
| Brawn Property Limited | Real estate | 2017 |
| Brenig Developments Ltd | Construction | 2016 |
| Brethertons Deli Ltd | Wholesale & retail | 2024 |
| Breton International Limited | Manufacturing | 2001 |
| Breton International Properties Ltd | Real estate | 2023 |
| Briarswood (Old Highway) Management Company Limited | Households | 2013 |
| Brickrend Ltd | Construction | 2025 |
| Bridgette Handley Ltd | Education | 2006 |
| Briggs & Co (Colwyn Bay) Ltd | Hospitality | 2024 |
| Brightlight Games Limited | Information & communication | 2020 |
| Brightside AI Ltd | Information & communication | 2023 |
| Brightview Windows Ltd | Construction | 2023 |
| Brightview Windows Suppliers Ltd | Wholesale & retail | 2024 |
| Brookes & Sons (Tarpaulins) Limited | Manufacturing | 1955 |
| Brookes Tarpaulins Holdings Limited | Financial services | 2023 |
| Brow Lash Boutique Ltd | Other services | 2022 |
| Brown Brothers Joiners Limited | Construction | 2003 |
| Bruce & Associates Wealth Management Limited | Professional & scientific | 2010 |
| Bruce the Hair Ltd | Other services | 2018 |
| Bryn Hardd Ltd | Administrative & support | 2014 |
| Bryn Heulog Management Company Limited | Households | 2019 |
| Bryn Mostyn RTM Company Limited | Households | 2017 |
| Bryn Y BIA RTM Company Limited | Households | 2018 |
| Building Surveying Solutions Limited | Extraterritorial | 2005 |
| Bullock & SON Limited | Wholesale & retail | 2017 |
| Business Dragons Ltd | Professional & scientific | 2025 |
| Button Basket Property Management Ltd | Real estate | 2020 |
| Buxton Group Assets Ltd | Real estate | 2021 |
| Buxton Group Holdings Ltd | Real estate | 2019 |
| C & K Beauty Ltd | Other services | 2016 |
| C a Car & Commercials Limited | Other services | 2017 |
| C J Carpets Limited | Construction | 2004 |
| C L Whitaker Joinery Limited | Construction | 2018 |