| 22-24-26-28 Glendale Drive Limited | Households | 1991 |
| 5153MRM Nottingham Limited | Hospitality | 2005 |
| 9TREES Nature Based Solutions CIC | Other services | 2019 |
| A & L Powell Property Ltd | Real estate | 2025 |
| A Davies Electrics Limited | Construction | 2020 |
| A R Pugh & Co Limited | Construction | 2008 |
| AA Home Heating Solutions Ltd | Construction | 2025 |
| Alan Southerby Planning Ltd | Professional & scientific | 2019 |
| Aled Jones & Daughters Limited | Agriculture & fishing | 2021 |
| Andrew M Davies Builders & Development Contractors Limited | Construction | 2009 |
| Apple Blossom Social Enterprise CIC | Agriculture & fishing | 2022 |
| Aral Estates Limited | Professional & scientific | 1967 |
| Art Mountain Limited | Arts & recreation | 2019 |
| Awjm Homes Limited | Hospitality | 2018 |
| Balmy FOX Ltd | Manufacturing | 2018 |
| Beacons Bluff Holidays Limited | Hospitality | 2020 |
| BEE Welsh Honey Company Limited | Manufacturing | 2016 |
| Beili-Ddol Foods Limited | Agriculture & fishing | 2007 |
| Beiliddol Properties Ltd | Hospitality | 2023 |
| BGM Construction Services Ltd | Construction | 2025 |
| Blaidd Drwg Limited | Wholesale & retail | 2025 |
| Blank Page Creative Ltd | Wholesale & retail | 2024 |
| Bloxham Professional Services Ltd | Professional & scientific | 2010 |
| Breconshire Dofe Award Group CIC | Health & social care | 2008 |
| Bridge View Flats Limited | Other services | 1992 |
| Brynderwen Residents Association Limited | Hospitality | 2007 |
| BSS Care LP | | 2018 |
| Builth Wells Community Support | Wholesale & retail | 2012 |
| Builth Wells Financial Planning Limited | Financial services | 2005 |
| Builth Wells Financial Services Limited | Financial services | 2002 |
| Builth Wells Golf Club (1987) Limited | Arts & recreation | 1987 |
| Builth Wells MOT and Service Centre Ltd | Wholesale & retail | 2015 |
| Builth Wells Rugby Football Club Limited | Arts & recreation | 2001 |
| Builth Wells Veterinary Practice Limited | Professional & scientific | 2020 |
| Business Puzzle Ltd | Hospitality | 2017 |
| C B Jones Ltd | Agriculture & fishing | 2014 |
| Calibre Models Limited | Administrative & support | 2011 |
| Campfield Consultancy Limited | Health & social care | 2023 |
| Celtic Woodland Holidays Limited | Hospitality | 2015 |
| Chester-Master Limited | Real estate | 1999 |
| Clear Glazing Limited | Construction | 2019 |
| Coal Dust Events Ltd | Administrative & support | 2017 |
| Coleman Coffee Roasters Limited | Manufacturing | 2015 |
| Collard Trading Ltd | Hospitality | 2014 |
| Collards Distillery Limited | Manufacturing | 2017 |
| Courier to Go Ltd | Transport & logistics | 2016 |
| Coyle Surfacing Limited | Construction | 2007 |
| CR Technical and Security Ltd | Administrative & support | 2025 |
| Cribs Clothing Limited | Wholesale & retail | 2002 |
| Crown Plastic Mouldings Limited | Manufacturing | 1979 |
| Cruise Catcher Ltd | Administrative & support | 2026 |
| Cwtch Cafe Builth Wells Limited | Hospitality | 2018 |
| Cycle-Tec Events Ltd | Arts & recreation | 2013 |
| Danelis Medical Limited | Wholesale & retail | 2017 |
| Darren Peel & Co Limited | Construction | 2002 |
| Deltohn Limited | Professional & scientific | 2001 |
| DH & HB Farming Ltd | Agriculture & fishing | 2024 |
| Dingleside Development Co.Limited | Construction | 1963 |
| Dream Finders Competitions Ltd | Other services | 2025 |
| Dwik Ltd | Agriculture & fishing | 2024 |
| Edan Construction Ltd | Construction | 2014 |
| Eppynt Carriage Club Limited | Arts & recreation | 2011 |
| Erwood Hall Ltd | Financial services | 2024 |
| Fairways in France Limited | Administrative & support | 2009 |
| Focus on Forestry First Limited | Agriculture & fishing | 2016 |
| Garry Mason Carpenter & Builder Limited | Construction | 2012 |
| Gill & Jones Distribution Ltd | Wholesale & retail | 2023 |
| Gill & Jones Ltd | Extraterritorial | 2020 |
| Global Gliding Expeditions Limited | Arts & recreation | 2001 |
| Goat Lake Farm Ltd | Agriculture & fishing | 2019 |
| Goholidays Ltd | Administrative & support | 2000 |
| Good Food Production Company Ltd | Wholesale & retail | 2017 |
| Graig Goch Garage Ltd | Wholesale & retail | 2023 |
| Green Power Services (Installations) Ltd | Construction | 2019 |
| Guinane Ltd | Construction | 2021 |
| Guud Company Limited | Manufacturing | 2020 |
| Gwennolddu Ltd | Professional & scientific | 2025 |
| Gwyn's Plock Maintenance Limited | Households | 2002 |
| H&W Developments Limited | Construction | 2017 |
| Haldon Homes Limited | Construction | 1966 |
| Harverson Property Limited | Real estate | 2025 |
| Highway Adventures Ltd | Administrative & support | 2020 |
| Hillside HR Consulting Limited | Administrative & support | 2019 |
| Holy COW Advertising Limited | Professional & scientific | 2004 |
| Irfon and Towy Limited | Real estate | 2014 |
| J & H Spreading & Agri Engineering Ltd | Agriculture & fishing | 2023 |
| J L Evans Limited | Construction | 2020 |
| J P L Groundwork and Civil Engineering Limited | Construction | 2016 |
| J Poulton Ltd | Construction | 2025 |
| James Celtic Properties Ltd | Real estate | 2025 |
| James Poultry Ltd | Agriculture & fishing | 2025 |
| Jcbl Building and Construction Limited | Construction | 2019 |
| JHL Civils & Surfacing Limited | Construction | 2026 |
| John Jones Civil Engineering & Groundworks Ltd | Construction | 2005 |
| Jpok Hospitality Ltd | Hospitality | 2026 |
| JSH Production Design Ltd | Professional & scientific | 2022 |
| L Jones Catering Ltd | Hospitality | 2022 |
| L Ryland Construction Limited | Construction | 2017 |
| LDW Bars Ltd | Hospitality | 2022 |
| LEE Buttitta Limited | Administrative & support | 2021 |