| 1ST Call Enterprise Ltd | Transport & logistics | 2017 |
| 2413H Limited | Wholesale & retail | 2025 |
| 27 Training Ltd | Education | 2022 |
| 2ND Generation Logistics Limited | Transport & logistics | 2020 |
| 365 Athlete Hub Ltd | Arts & recreation | 2023 |
| 3G Construction (MID Wales) Ltd | Construction | 2016 |
| A & J Cooperwhite Ltd | Real estate | 2011 |
| A&S Housing Limited | Real estate | 2020 |
| Aaadental Ltd | Health & social care | 2022 |
| AB Cleaning Bechta Limited | Other services | 2024 |
| AB Global Risk Advisory Ltd | Administrative & support | 2026 |
| AB Sprinklers Limited | Public administration | 2017 |
| Abbas Limited | Education | 1996 |
| ABC Polish Shop Newtown Limited | Wholesale & retail | 2018 |
| Abcleaningkate Limited | Other services | 2025 |
| Aberhafesp Community Centre Limited | Other services | 2014 |
| Accuracy Risk Management Ltd | Administrative & support | 2021 |
| Actia (UK) Limited | Manufacturing | 1994 |
| ACTIV8KIDS Ltd | Education | 2016 |
| Adam Cotton Driver Training Limited | Education | 2015 |
| Advance Building Designs Limited | Professional & scientific | 2014 |
| AF Security Services Ltd | Administrative & support | 2025 |
| Affinity Homecare Solutions Ltd | Health & social care | 2010 |
| AGE Cymru Powys | Health & social care | 2012 |
| Agile Fire Safety Ltd | Professional & scientific | 2017 |
| AGJ Powys Limited | Agriculture & fishing | 2022 |
| Agnos Villas Ltd | Real estate | 2022 |
| AJ Construction (Powys) Ltd | Construction | 2026 |
| AL Leisure Limited | Hospitality | 2025 |
| AL Technical Services Limited | Construction | 2018 |
| Alary Property Investment Co.Limited | Real estate | 1959 |
| Aleppo Merchant Inn Ltd | Hospitality | 2014 |
| Alienor Cros Ltd | Professional & scientific | 2026 |
| ALL Seasons Spice Ltd | Hospitality | 2020 |
| ALL Toe-Gether Podiatry Ltd | Health & social care | 2026 |
| Allied Plant & Landscapes Limited | Construction | 2006 |
| Allsportz Limited | Extraterritorial | 2021 |
| Alpha Plumbers (Newtown) Ltd | Construction | 2003 |
| Alun Roberts Car Sales Limited | Wholesale & retail | 2002 |
| Amita Global Solutions Ltd | Professional & scientific | 2019 |
| Andrew Evans Landscapes Limited | Administrative & support | 2017 |
| Antur CWE CYF | Energy | 2016 |
| APT Homes Limited | Real estate | 2018 |
| APT Plumbing and Heating Limited | Construction | 2008 |
| Ardil Decoration Ltd | Construction | 2020 |
| Ardwyn Management Company Limited | Households | 2003 |
| Auad Holdings Limited | Financial services | 2024 |
| B Tomlins Ltd | Agriculture & fishing | 2024 |
| Back-Up Line Ltd | Mining & quarrying | 2014 |
| Banks Biotech Innovations Ltd | Professional & scientific | 2026 |
| Banwy Leisure Ltd | Wholesale & retail | 2018 |
| BASE24 Limited | Construction | 2019 |
| Bduk Construction Ltd | Construction | 2024 |
| Beautiful Jewellery Company Ltd | Wholesale & retail | 2011 |
| Bechta Property Ltd | Real estate | 2024 |
| BEE True Ltd | Manufacturing | 2022 |
| Beelicious Ltd | Manufacturing | 2024 |
| Benjamin Davies Consulting Limited | Administrative & support | 2021 |
| Bentham Engineering Ltd | Professional & scientific | 2014 |
| Bethany Training Services Limited | Education | 2005 |
| Bettws Hall Sporting Club | Arts & recreation | 2023 |
| Birchfield Holdings Limited | Financial services | 2024 |
| Bj's (MID Wales) Ltd | Wholesale & retail | 2000 |
| BJD Renewables Ltd | Energy | 2022 |
| Blacktier Ltd | Information & communication | 2025 |
| Blossom Park Developments Limited | Construction | 2015 |
| Blue Lins Limited | Real estate | 2019 |
| BO Peeps Sheperds Huts Ltd | Manufacturing | 2017 |
| Border Counties Reclamation Limited | Wholesale & retail | 1999 |
| Border Janitorial Supplies Ltd | Wholesale & retail | 1989 |
| Bowen Properties Limited | Real estate | 2009 |
| Brewama Limited | Financial services | 2017 |
| Broadstone Risks Limited | Administrative & support | 2017 |
| Bronde Limited | Construction | 2019 |
| Bryn Y CIL Estate Ltd | Agriculture & fishing | 2026 |
| Brynam Holdings Limited | Agriculture & fishing | 2015 |
| Bryncoch Farm Caravan Park Limited | Hospitality | 2023 |
| Building Estate Nexus Limited | Real estate | 2026 |
| Burns Brothers Limited | Hospitality | 2005 |
| Bäro Retail Lighting UK Ltd | Wholesale & retail | 2023 |
| C & R Williams Limited | Transport & logistics | 2016 |
| C a Hire Limited | Administrative & support | 2022 |
| C B Electrical Powys Ltd | Construction | 2024 |
| C&S Next Fitness Ltd | Arts & recreation | 2025 |
| Caelum Ventures Ltd | Information & communication | 2023 |
| Cafe Piazza Limited | Hospitality | 1996 |
| Calcourt Farms Limited | Agriculture & fishing | 2012 |
| Callidus Roofing Ltd | Construction | 2024 |
| Cambrian Drinks Ltd | Manufacturing | 2023 |
| Cambrian Foundry Newtown Limited | Manufacturing | 2007 |
| Cambrian Group Holdings Ltd | Financial services | 2023 |
| Cambrian Marketing Limited | Administrative & support | 2010 |
| Cambrian Packaging Ltd | Administrative & support | 2010 |
| Cambrian Solvents Limited | Manufacturing | 1975 |
| Cambrian UK Holdings Ltd | Financial services | 2022 |
| Casaevo Ltd | Wholesale & retail | 2025 |
| Cava Executive Limited | Administrative & support | 2026 |
| Cavenagh Associates Limited | Professional & scientific | 2005 |
| Caws Cambria Limited | Manufacturing | 2026 |
| CDL Group Ltd | Professional & scientific | 2013 |