| 11 Norfolk Buildings Management Company Limited | Households | 1984 |
| 1ST Choicescaffoldingwales Limited | Construction | 2023 |
| 21C Marketing Ltd | Other services | 2015 |
| 24 Karat Properties Ltd | Real estate | 2025 |
| 3D Group Ltd | Financial services | 2020 |
| 3M Air Ltd | Administrative & support | 2022 |
| 3M Holdings Ltd | Real estate | 2018 |
| 3M Leisure Ltd | Real estate | 2021 |
| 4MVNO Limited | Administrative & support | 2015 |
| 80CS Ltd | Construction | 2018 |
| A & B Developments (Pembs) Ltd | Real estate | 2025 |
| A & E Adventures Ltd | Administrative & support | 2016 |
| A & J Thomas Holdings Limited | Construction | 2007 |
| A C Davies Limited | Wholesale & retail | 2005 |
| A L Giant Limited | Health & social care | 2023 |
| A M J Mortgage & Protection Advisor Ltd | Financial services | 2018 |
| A Stow Engineering Ltd | Professional & scientific | 2023 |
| A&M Health, Safety & Environmental Consultants Ltd | Professional & scientific | 2023 |
| A.B.S. Engineering Services Limited | Professional & scientific | 2022 |
| A1 Precision Engineering Ltd | Professional & scientific | 2022 |
| A1 Theory Training Ltd | Education | 2026 |
| Ably Fire Safety Limited | Other services | 2017 |
| Accomodate Limited | Real estate | 2005 |
| Acorn 1000 Ltd | Real estate | 2025 |
| Addict Designs Limited | Arts & recreation | 2015 |
| Adept Interior Installation Limited | Construction | 2019 |
| ADN Building Solutions Ltd | Construction | 2019 |
| Adrias Properties Limited | Real estate | 2021 |
| Aesthetically Yours Limited | Health & social care | 2020 |
| AGL HV Services Ltd | Construction | 2018 |
| AJ Global Distribution Limited | Financial services | 2024 |
| ALG Roofing Limited | Construction | 2022 |
| ALL Pembrokeshire Group Ltd | Financial services | 2024 |
| All-Ways Stainless Services Limited | Construction | 2007 |
| Alma Medical Products Ltd | Manufacturing | 2021 |
| ALW Mechanical Services Ltd | Professional & scientific | 2026 |
| ALX Engineering Ltd | Professional & scientific | 2023 |
| Andy Stokes Consulting Limited | Information & communication | 2014 |
| ANG Enterprises Limited | Construction | 2009 |
| Antelope Financial Limited | Professional & scientific | 2020 |
| Aqua High Pressure Cleaning Ltd | Administrative & support | 2026 |
| Arbresponse Ltd | Professional & scientific | 2024 |
| ARR ZOO Limited | Other services | 2013 |
| Arted EU Limited | Information & communication | 1997 |
| Ashdale Engineering and Lifting Services Limited | Manufacturing | 1996 |
| Ashlan Properties Limited | Construction | 1986 |
| Ashleigh Music Limited | Information & communication | 2007 |
| Ashley & Company Refinery Consultants Limited | Professional & scientific | 2006 |
| Ashton Innovations Limited | Financial services | 2021 |
| AT Plumbing (Pembs) Ltd | Construction | 2024 |
| Auburn Priory Investments Limited | Hospitality | 2022 |
| Australian-Migration Group Limited | Administrative & support | 2003 |
| Austwel Holdings Limited | Administrative & support | 2004 |
| Austwel Limited | Construction | 1983 |
| B & B Restaurant Ltd | Hospitality | 2020 |
| B Goodridge Solutions Ltd | Construction | 2014 |
| B&N Pembrokeshire Limited | Wholesale & retail | 2024 |
| B-Fit Health & Fitness Limited | Arts & recreation | 2015 |
| B-Fit Supplies Limited | Wholesale & retail | 2021 |
| Back Fit Chiropractic Ltd | Health & social care | 2024 |
| Balancing Rocks Limited | Real estate | 2017 |
| Bana Barber Ltd | Other services | 2025 |
| Banglagor Ltd | Real estate | 2025 |
| Barabarani Limited | Education | 2009 |
| Barlow House Limited | Health & social care | 2019 |
| Barn Street Community Ltd | Hospitality | 2025 |
| Barti RUM Ltd | Manufacturing | 2018 |
| BB ZOO Limited | Administrative & support | 2014 |
| BBP Development Limited | Construction | 2020 |
| BBP Property Limited | Construction | 2020 |
| BDJ Enterprises Limited | Health & social care | 2023 |
| BDS Assets Limited | Construction | 1987 |
| BDS Contracts (MH) Limited | Construction | 1992 |
| BDS Industrial Painting & Water Jetting Limited | Construction | 1995 |
| BE KEE Ltd | Hospitality | 2022 |
| Beaconing Fields Management Company Limited | Households | 2019 |
| Beatgrove Limited | Construction | 1980 |
| Belmartin Properties Limited | Real estate | 2025 |
| Benton Farm Limited | Agriculture & fishing | 2016 |
| BHR Properties Limited | Real estate | 2018 |
| Bicton Farms Limited | Agriculture & fishing | 2003 |
| Blendify Ltd | Professional & scientific | 2023 |
| Blenheim Court Neyland Ltd | Households | 2011 |
| Block by Night Ltd | Hospitality | 2026 |
| Block Entertainment Ltd | Hospitality | 2025 |
| Bloctech Ltd | Information & communication | 2022 |
| BLU Haven Security Limited | Administrative & support | 2026 |
| Bluestone Multi-Media Limited | Professional & scientific | 2000 |
| Boeboes Limited | Manufacturing | 2011 |
| Boutique Manufacturing Limited | Manufacturing | 2016 |
| BOW Construction Conservation & Property Maintenance Limited | Construction | 2015 |
| Box Smart Advertising Ltd | Administrative & support | 2002 |
| Brilliant Fabrications Limited | Manufacturing | 2014 |
| Bristow Refrigeration Ltd | Construction | 2024 |
| Brompton Park Development Limited | Construction | 2006 |
| Brushed by Amelia Limited | Other services | 2025 |
| BSR Design Ltd | Professional & scientific | 2019 |
| Bunkers Hill Equestrian Limited | Agriculture & fishing | 2012 |
| Butternut Pantry Limited | Hospitality | 2021 |
| Buzzcut Garden Maintenance Ltd | Administrative & support | 2024 |