| 7dn Ltd | Hair & beauty | SA11 1RQ | 2025 |
| A & A Auto Electrical Ltd | Garages & mechanics | SA10 6HA | 2022 |
| A & A Electrical & Sons Ltd | Garages & mechanics | SA10 6HA | 2010 |
| A & R Electrical (Wales) Ltd | Electricians | SA11 3NY | 2008 |
| A and P Building Ltd | Builders | SA11 2TA | 2025 |
| A Pro Tree & Landscaping Ltd | Gardeners & landscapers | SA11 3BH | 2026 |
| A To Z Roofing & Property Maintenance Ltd | Builders | SA11 3BH | 2026 |
| A.H. Williams Electrical Ltd | Electricians | SA10 7QU | 2010 |
| A.H.G. Corporate Group Ltd | Electricians | SA11 3BH | 2018 |
| A.P. Plastering Ltd | Plasterers | CF44 0PY | 2002 |
| A1 Garden Room Solutions Ltd | Builders | SA11 5HH | 2026 |
| A1 Garden Solutions Wales Ltd | Gardeners & landscapers | SA10 9LD | 2020 |
| A1 Industrial Roofing & Cladding Specialists Ltd | Builders | SA10 7EG | 2026 |
| A1 Pristine Property Care and Clean Ltd | Cleaners | SA10 7EG | 2025 |
| Aa Window and Door Services Ltd | Glaziers | SA10 6HG | 2024 |
| Aberdare Automotive Services Ltd | Garages & mechanics | CF44 0PN | 2025 |
| Aberdare Crash Accident Repair Centre Ltd | Garages & mechanics | CF44 0AG | 2017 |
| Aberdare Demolition Ltd | Groundworks & demolition | CF44 0AG | 1991 |
| Abernails Ltd | Hair & beauty | CF44 7DP | 2026 |
| Ace Landscaping Ltd | Gardeners & landscapers | CF44 0BG | 1987 |
| Acn Construction Ltd | Builders | CF44 9EH | 2023 |
| Activate Construction Ltd | Groundworks & demolition | CF44 6BJ | 2015 |
| Adam Williams (Neath) Electrical Ltd | Electricians | SA11 3PA | 2025 |
| Adams Repair Ltd | Garages & mechanics | SA11 1HD | 2024 |
| Adk Drylining Ltd | Builders | CF44 6UW | 2026 |
| Adrian Powell Developments Ltd | Builders | SA10 7DT | 2006 |
| Advanced Brickwork Contractors Ltd. | Builders | SA10 9PN | 2011 |
| Afan Valley Maids Ltd. | Cleaners | SA11 1YB | 2025 |
| Affordable Quality Windows Ltd | Builders | SA10 7HP | 2020 |
| Ag Window & Door Repairs Ltd | Glaziers | CF44 7DG | 2024 |
| Ajp Cladding Ltd | Roofers | CF44 6AU | 2022 |
| Ajt Mechanical and Plumbing Engineers Ltd | Plumbing & heating | SA10 6FX | 2023 |
| Ak Jones Property Management Ltd | Builders | SA11 4LR | 2026 |
| Akw Fabrications Ltd | Builders | SA11 1DQ | 2021 |
| Alb Property Services Ltd | Builders | SA11 2PF | 2019 |
| Albannie Internals Ltd | Builders | CF44 0HR | 2026 |
| Alewisindustrial Ltd | Cleaners | SA11 1EF | 2026 |
| All Floored Out Ltd | Flooring & tiling | SA10 7FH | 2026 |
| Amd Construction South Wales Ltd | Builders | SA11 3BH | 2024 |
| Ams Garage Glynneath Ltd | Garages & mechanics | SA11 5EF | 2026 |
| Ana Remedials Ltd | Groundworks & demolition | SA11 3BH | 2015 |
| Anderson Building & Maintenance Ltd | Builders | SA11 2AY | 2025 |
| Anthony Charles Ltd | Hair & beauty | CF44 9LE | 2003 |
| Antipest Ltd | Pest control | SA11 3BH | 2024 |
| Apex Grounds Maintenance Ltd | Gardeners & landscapers | SA10 6HA | 2017 |
| Apex Roofing & Guttering Services Ltd | Roofers | SA11 3BH | 2026 |
| Apj Railway Ltd | Electricians | CF44 8PL | 2026 |
| Apollo Flooring Contracts Ltd | Flooring & tiling | CF44 0BU | 2025 |
| Applefray Ltd | Builders | SA10 7AJ | 2019 |
| Arctos Racing Ltd | Garages & mechanics | SA11 2TU | 2026 |
| Art Construct Ltd | Builders | SA10 6FS | 2007 |
| Ascend Exterior Solutions Ltd | Builders | SA10 9NH | 2026 |
| Ascragga Rooch Infrastructure Projects Ltd | Builders | SA11 1DJ | 2019 |
| Aspect Groundworks Ltd | Builders | SA11 5NF | 2023 |
| Atom Heating Ltd | Electricians | SA11 5PB | 2012 |
| Atom Solar Installations Ltd | Electricians | SA10 7HQ | 2026 |
| Auto-Matt-Ic Ltd | Garages & mechanics | CF44 6LR | 2024 |
| B.A.G Services Ltd | Cleaners | SA10 8PF | 2019 |
| Bailey Thomas Shutters Ltd | Builders | SA10 7DN | 2024 |
| Bailey'S Blinds Neath Ltd | Builders | SA10 7DN | 2021 |
| Baileys Blinds Swansea Ltd | Builders | SA10 7DN | 2025 |
| Bater Electrical & Building Services Ltd | Electricians | SA10 6EB | 2018 |
| Bb Sparks Ltd | Electricians | CF44 6PA | 2018 |
| Beauty Vision Ltd | Hair & beauty | SA10 8ND | 2018 |
| Bedrooms, Kitchens and Bathrooms Ltd | Builders | CF44 8LE | 2015 |
| Bhl Fix Ltd | Builders | CF44 8BZ | 2026 |
| Bk68 Carpentry Ltd | Joiners & carpenters | CF44 0HA | 2026 |
| Blue Electrics Solar Ltd | Electricians | SA11 2FP | 2025 |
| Bluebox Removals & Transport Ltd | Removals | CF44 0AG | 2025 |
| Boiler Boyz (South Wales) Ltd | Plumbing & heating | SA11 1JQ | 2026 |
| Boran Ltd | Hair & beauty | SA11 1PU | 2019 |
| Boss Building Contractors Ltd | Plasterers | SA10 6HA | 2023 |
| Boston Barberz Ltd | Hair & beauty | SA11 3BH | 2025 |
| Bps Roofing and Carpentry Ltd | Joiners & carpenters | SA11 5RG | 2021 |
| Bravegate Ltd | Garages & mechanics | SA11 1SB | 1980 |
| Brennan Design & Developments Ltd | Builders | CF44 0DB | 2023 |
| Brilliant Hand Car Wash Ltd | Cleaners | SA11 2HD | 2024 |
| Bristol Building Contracts Ltd | Builders | CF44 9RD | 2015 |
| Briton Ferry Hand Car Wash Ltd | Garages & mechanics | SA11 2AQ | 2020 |
| Building Neads Ltd | Builders | CF44 6DU | 2005 |
| Bumps & Scuffs Car Care Ltd | Garages & mechanics | SA10 6JY | 2015 |
| Burner Efficiency Services Ltd | Plumbing & heating | CF44 6PD | 2006 |
| C & C Wood Ltd | Builders | CF44 9YU | 2021 |
| C & P Building Contractors Ltd | Builders | SA10 7DR | 2022 |
| C & R Solutions Wales Ltd | Builders | SA10 7EL | 2024 |
| C Lewis Construction Ltd | Builders | CF44 9HS | 2017 |
| C&G Home Improvements Ltd | Joiners & carpenters | SA11 1PG | 2020 |
| C&N Van & Commercials Ltd | Garages & mechanics | CF44 9PT | 2019 |
| C&T Eco Consultants Ltd | Plumbing & heating | SA11 1NJ | 2014 |
| C'N'C Home Improvements Ltd | Joiners & carpenters | CF44 8BD | 2015 |
| C. Moses Roofing Ltd | Builders | SA11 4BG | 1982 |
| C.A.J. Fielding Engineering Services Ltd | Builders | SA11 3XF | 2013 |
| C.C.S. Neath Electrics Ltd | Electricians | SA10 6BS | 1977 |
| C.J.J. Screeders Ltd | Flooring & tiling | SA11 5PW | 2005 |
| Caer Hendy Gardens Ltd | Builders | SA10 6AY | 2005 |
| Caled Bricklaying Ltd | Builders | SA11 5LB | 2025 |
| Capricorn Windows Ltd | Builders | CF44 8RN | 2003 |
| Car Line Crash Repair Center Ltd | Garages & mechanics | CF44 6RS | 2020 |
| Carl Hendy Ltd | Builders | SA11 1LF | 2013 |
| Carl Sweet Ltd | Roofers | CF44 9SG | 2009 |
| Castell Nedd Gardening Ltd | Gardeners & landscapers | SA11 4BN | 2025 |
| Castle Carpentry Ltd | Joiners & carpenters | SA10 8LF | 2016 |
| Cav'S Green Management Ltd | Gardeners & landscapers | CF44 0RQ | 2026 |
| Cavi Clear Ltd | Builders | SA11 1DQ | 2018 |
| Cavibuild Ltd | Builders | SA11 2NS | 2022 |
| Cb Heating & Plumbing Sw Ltd | Plumbing & heating | CF44 8AQ | 2026 |
| Cbmg Electrical Services Ltd | Electricians | CF44 0UR | 2026 |
| Ccs (Aberdare) Ltd | Cleaners | CF44 7AA | 2019 |
| Celtic Damproofing Ltd | Builders | CF44 0ED | 2001 |
| Celtic Furniture Installations Ltd | Joiners & carpenters | SA10 6RP | 2023 |
| Cf Star Nails Ltd | Hair & beauty | CF44 7AP | 2019 |
| Cfj Developments Ltd | Builders | SA10 6EJ | 2024 |
| Chargepoint Solutions Ltd | Electricians | SA11 3BX | 2021 |
| Chris Evans Building Contractors Ltd | Builders | CF44 0YS | 2011 |
| Cjc Estates Ltd | Builders | CF44 0EZ | 2012 |
| Cjc Plant Hire Ltd | Builders | CF44 0EZ | 2026 |
| Clad9 Ltd | Builders | CF44 6TP | 2023 |
| Cladding Technology Ltd | Builders | SA10 7HQ | 2023 |
| Clearleap Ltd | Builders | CF44 9SX | 2026 |
| Clearstone Exterior Solutions Ltd | Cleaners | SA11 1UT | 2026 |
| Clh Brickwork Ltd | Builders | SA11 4AQ | 2026 |
| Clio Barbers Ltd | Hair & beauty | SA11 3BH | 2017 |
| Clm Windows & Doors Ltd | Builders | CF44 8DN | 2020 |
| Cm Nest Ltd | Builders | SA11 3RN | 2025 |
| Cocosteli Construction Ltd | Builders | CF44 6YE | 2025 |
| Complete Estates Maintenance Ltd | Builders | CF44 9QT | 2019 |
| Concept Media Walls Ltd | Joiners & carpenters | SA10 9LD | 2025 |
| Concrete Structures & Floors Ltd | Builders | SA10 7DR | 2012 |
| Construction Group Ltd | Builders | SA10 6LR | 2016 |
| Cool-Link Ltd | Plumbing & heating | SA10 7HF | 2021 |
| Core Seal Ltd | Builders | SA11 4HF | 2017 |
| Court'S Gas Ltd | Plumbing & heating | SA10 8BE | 2019 |
| Creative Paving (Tvs) Ltd | Builders | SA11 3BH | 2022 |
| Crossbeam Carpentry Ltd | Joiners & carpenters | SA10 6TR | 2025 |
| Crown Property & Roofing Specialist Ltd | Builders | SA11 3BH | 2024 |
| Crynant Home Improvements & Conservatories Ltd | Builders | SA10 8PX | 2018 |
| Cs Renovations Carpentry + Plastering Ltd | Joiners & carpenters | CF44 9LH | 2026 |
| Cultive Ltd | Hair & beauty | SA10 6EU | 2025 |
| Currentmax Innovations Ltd | Electricians | CF44 8HX | 2025 |
| Cva Building Ltd | Builders | CF44 6SN | 2007 |
| Cynon Contract Services Ltd | Builders | CF44 0SG | 2023 |
| Cynon Valley Alarms and Electrical Services Ltd | Electricians | CF44 6EW | 2020 |
| Cyris Plant Operations Ltd | Builders | SA11 5EY | 2023 |
| D Electrical Ltd | Electricians | CF44 6LP | 2025 |
| D H Designer Home Improvements Ltd | Builders | SA11 2SL | 2026 |
| D M Caviell Services Ltd | Builders | CF44 0RQ | 2018 |
| D&A Carpentry Specialist Ltd | Builders | CF44 0AJ | 2003 |
| D&A Connections Ltd | Builders | CF44 9AW | 2018 |
| D&F Safe and Secure Roofing Ltd | Roofers | SA11 3BH | 2026 |
| D.P. Air Conditioning & Refrigeration Ltd | Plumbing & heating | CF44 6YE | 2026 |