| 53 Cardiff Road Ltd | Hospitality | 2024 |
| A & B Bookkeeping Services Limited | Professional & scientific | 2022 |
| A&K Davies Property Limited | Real estate | 2025 |
| Abacus Assessments Ltd | Education | 2017 |
| Absolutely Pawsome Ltd | Other services | 2024 |
| Account N SEE Ltd. | Professional & scientific | 2019 |
| Accountandsee Ltd | Professional & scientific | 2019 |
| Acorn General & Commercial Limited | Wholesale & retail | 2020 |
| AEJ Hospitality Ltd | Hospitality | 2024 |
| AF Scarfe Properties Ltd | Real estate | 2026 |
| AJT Tree Services Ltd | Administrative & support | 2025 |
| ALL Heights Scaffolding Ltd | Construction | 2020 |
| Allcare and Education Recruitment Limited | Administrative & support | 2020 |
| Allmon Ltd | Other services | 2011 |
| Alpha Code Coaching Limited | Health & social care | 2024 |
| Amos Construction Ltd | Construction | 2018 |
| Anchorbay Supply Ltd | Wholesale & retail | 2025 |
| Andrew Walker Electrical Solutions Ltd | Construction | 2021 |
| Antalya Barber SHOP(CF46) Limited | Other services | 2024 |
| Anton Glazing Ltd | Construction | 2022 |
| Apex Sprinklers Ltd | Construction | 2024 |
| Applied Control Technology Limited | Information & communication | 1996 |
| Apricot Mortgages and Loans Ltd | Financial services | 2006 |
| APS Renovations Ltd | Construction | 2024 |
| Aquarius Omens Ltd | Wholesale & retail | 2020 |
| ARC Auto Repair Centre Limited | Wholesale & retail | 2024 |
| Armada Industries and Technologies Ltd | Professional & scientific | 2010 |
| B a W Financial Contracting Ltd | Professional & scientific | 2014 |
| B&C Telecoms Ltd | Information & communication | 2022 |
| Baby Farm Group Limited | Health & social care | 2015 |
| Baileys Building Contractors Wales Ltd | Construction | 2026 |
| Baileys Building Services Limited | Construction | 2021 |
| Balance Audio Ltd | Manufacturing | 2016 |
| BAM Distributions Ltd | Wholesale & retail | 2026 |
| Bayside Estates Sales and Lettings Ltd | Financial services | 2013 |
| BCB Renewables Ltd | Construction | 2024 |
| BDJ Navigation Limited | Hospitality | 2017 |
| Beacon Support Ltd | Education | 2016 |
| Beauty Above Limited | Other services | 2018 |
| Beauty and Nails by Alisha Jane Limited | Other services | 2023 |
| Berrythreads Ltd | Wholesale & retail | 2026 |
| Berthgron Quarry Limited | Water & waste | 2012 |
| BESPOKEBUILDS808 Ltd | Construction | 2020 |
| BG Drywall Systems Limited | Construction | 2016 |
| Big Granty Ltd | Administrative & support | 2021 |
| Bird Construction Services Ltd | Construction | 2021 |
| Black Desert OFF Road Training Limited | Arts & recreation | 2014 |
| Blackbrook Property Developments Ltd | Real estate | 2022 |
| Bookmate Ltd | Professional & scientific | 2019 |
| Bounds Brickwork Ltd | Construction | 2026 |
| Bowen (Contracting) Limited | Water & waste | 2002 |
| Brew & Brawl Ltd | Hospitality | 2025 |
| Brian Thomas Transport Limited | Other services | 1998 |
| Brick Bundler Ltd | Wholesale & retail | 2021 |
| Buns N Beyond Ltd | Hospitality | 2025 |
| BY Cloe Co Ltd | Other services | 2026 |
| C & S Plastering Limited | Construction | 1998 |
| C&C Rees Properties Limited | Real estate | 2025 |
| Caeglas Colliery Co Limited(The) | Mining & quarrying | 1966 |
| Cafe Nelson (Nelson) Ltd | Hospitality | 2023 |
| Carmel Construction (Merthyr Tydfil) Ltd | Construction | 2015 |
| Carpe Momentum Limited | Financial services | 2016 |
| Carwyn's Cars Ltd | Transport & logistics | 2025 |
| CCL Haulage Limited | Construction | 2016 |
| CJK Plant Hire Ltd | Construction | 2021 |
| Club 50 Padel Ltd | Arts & recreation | 2026 |
| Commercial Vans Ltd | Wholesale & retail | 2026 |
| Complete Property Surveys Ltd | Professional & scientific | 2023 |
| Computer Builders Limited | Wholesale & retail | 2015 |
| Conjac Ecology Ltd | Professional & scientific | 2025 |
| CP Tools Limited | Wholesale & retail | 2012 |
| Cribb & Sons Limited | Hospitality | 2024 |
| CT Pipeworks Ltd | Professional & scientific | 2023 |
| Custom C Conversions Ltd | Construction | 2025 |
| Cylch Meithrin Mafon DWT CYF. | Health & social care | 2025 |
| David W Thomas Ltd | Professional & scientific | 2024 |
| Davprop Ltd | Real estate | 2026 |
| Dayline Engineering Construction Ltd | Construction | 2024 |
| Dazzle 'N' Shine Ltd | Administrative & support | 2019 |
| DB Trees and Fencing Limited | Administrative & support | 2023 |
| DBT Enterprises Ltd | Professional & scientific | 2000 |
| Deco Glass & Glazing Ltd | Construction | 2010 |
| Discount Pram Centre Limited | Wholesale & retail | 2016 |
| DT Motorcycles Ltd | Wholesale & retail | 2025 |
| DTM Brick N Stone Contractors Limited | Construction | 2014 |
| Dynamic Property Wealth Ltd | Real estate | 2025 |
| Dynasty Emergency Services Ltd | Construction | 2026 |
| Eco Plumb Services Ltd | Construction | 2020 |
| Ellieb Ltd | Wholesale & retail | 2025 |
| Enigma Design Ltd | Professional & scientific | 2023 |
| Equity Foundation Ltd | Administrative & support | 2018 |
| Esmac Ltd | Other services | 2026 |
| Evans Electrical SW Ltd | Construction | 2025 |
| Feed ME Fitt Merthyr Ltd | Hospitality | 2023 |
| First 4 Rentals Limited | Real estate | 2008 |
| Fisher Engineering Consultancy Limited | Professional & scientific | 2024 |
| Flopop Properties Ltd | Real estate | 2025 |
| Fusion Building Services Ltd | Construction | 2021 |
| Fusion Electrical & Building Services Engineering Ltd | Construction | 2013 |
| Fusion Technical Systems Limited | Professional & scientific | 2024 |