| A-Spec Electrical Ltd | Electricians | CF48 2EJ | 2019 |
| A.L.F. Electrical Management Ltd | Electricians | CF48 1JN | 2018 |
| A1 Zero Carbon Ltd | Builders | CF48 2SR | 2024 |
| Ace Property Investments Ltd | Builders | CF48 3SS | 2006 |
| Acp Electrical Ltd | Electricians | CF48 3BE | 2019 |
| Adfercymru Ltd | Builders | CF48 4QA | 2021 |
| Adlam Drylining and Plastering Ltd | Plasterers | CF48 1RJ | 2020 |
| All Round Energy Solutions Ltd | Electricians | CF48 1YF | 2012 |
| Amber & Ruby Developments Ltd | Builders | CF48 2SR | 2017 |
| Andrew Jones Safety Ltd | Electricians | CF48 4NS | 2011 |
| Apex Construction South Wales Ltd | Painters & decorators | CF48 2SR | 2025 |
| Aurora B Solar Ltd | Electricians | CF48 1HW | 2024 |
| Auto Repairs Merthyr Ltd | Garages & mechanics | CF48 1BS | 2025 |
| Autoscuffs Ltd | Painters & decorators | CF48 3TD | 2024 |
| Axis Electrical Services Ltd | Electricians | CF48 2BY | 2026 |
| Beacons Group Ltd | Builders | CF48 2SR | 2024 |
| Beauty Booth (Merthyr Tydfil) Ltd | Hair & beauty | CF48 1JF | 2020 |
| Beauty Box Mt Ltd | Hair & beauty | CF48 2SR | 2023 |
| Bianca Jade Hair Academy Ltd | Hair & beauty | CF48 3PU | 2026 |
| Bkwood Ltd | Joiners & carpenters | CF48 1AD | 2023 |
| Blakey'S Mot Center Ltd | Garages & mechanics | CF48 2YG | 2024 |
| Breconshire Construction Ltd | Builders | CF48 2EE | 2013 |
| Brickfitz Ltd | Builders | CF48 4SZ | 2024 |
| C & M Window Tinting Specialists Ltd | Garages & mechanics | CF48 4DR | 2005 |
| C J Price Autos Ltd | Garages & mechanics | CF48 3DL | 2025 |
| C3 Construction Services Ltd | Builders | CF48 2DN | 2018 |
| Car Care (Merthyr Tydfil) Ltd | Garages & mechanics | CF48 2SR | 2003 |
| Car Care Auto Centre Ltd | Garages & mechanics | CF48 2SR | 2014 |
| Cbd Decorators Ltd | Painters & decorators | CF48 1BP | 2017 |
| Cds Heating Services Ltd | Plumbing & heating | CF48 1BG | 2025 |
| Chace Group Ltd | Groundworks & demolition | CF48 1ND | 2026 |
| Cheeke Jones Building Services Ltd | Builders | CF48 2EB | 2025 |
| Chris Tasker Construction Ltd | Builders | CF48 4LT | 2025 |
| Ckm Plumbing & Heating Services Ltd | Plumbing & heating | CF48 3AL | 2024 |
| Cleaver Ltd | Electricians | CF48 2BF | 2014 |
| Connect Electrical & Energy Services Ltd | Electricians | CF48 3TE | 2019 |
| Cpa Construction Services Ltd | Builders | CF48 1RA | 2026 |
| Creative Landscaping & Driveways Ltd | Gardeners & landscapers | CF48 4TN | 2024 |
| Crown Tyre and Auto Centre Ltd | Garages & mechanics | CF48 4TQ | 2017 |
| Csj Carpentry & Construction Ltd | Joiners & carpenters | CF48 2AY | 2022 |
| Danny Electrical Services Ltd | Electricians | CF48 3AU | 2018 |
| Ddsk Developments Ltd | Builders | CF48 4TQ | 2019 |
| Diamond Quality Ltd | Builders | CF48 3PW | 2025 |
| Dizzy Heights Access Solutions Ltd | Builders | CF48 2SR | 2014 |
| Doors 2 Go Ltd | Glaziers | CF48 1AD | 2019 |
| Dowlais Heating Ltd | Plumbing & heating | CF48 2EJ | 2002 |
| Drec Building Ltd | Builders | CF48 4EX | 2014 |
| Ec-Ec Fiber Ltd | Electricians | CF48 3SA | 2023 |
| Eco Building Compliance UK Ltd | Builders | CF48 1BW | 2023 |
| Efs Systems (UK) Ltd | Electricians | CF48 3BU | 2012 |
| Elt Brickwork Ltd | Builders | CF48 1TU | 2026 |
| Envision Contractors Ltd | Builders | CF48 2AU | 2023 |
| Ev Electrical Solutions Ltd | Electricians | CF48 1NS | 2021 |
| Evans Fencing Ltd | Gardeners & landscapers | CF48 2SN | 2017 |
| Evolve Heating Ltd | Plumbing & heating | CF48 4QF | 2023 |
| Excelsior Electrical Engineering Ltd | Electricians | CF48 4DR | 2024 |
| Fear & Law Properties Ltd | Builders | CF48 3HF | 2024 |
| Ffrind Developments Ltd | Builders | CF48 4TQ | 2016 |
| Flec Construction Ltd | Builders | CF48 4QP | 2026 |
| Flow Taenellwyr Tan Ltd | Plumbing & heating | CF48 4DR | 2017 |
| G Caswell Services Ltd | Builders | CF48 3LD | 2018 |
| G Curtis Rail Ltd | Builders | CF48 1TW | 2017 |
| Galaxy Plumbing and Property Maintenance Ltd | Plumbing & heating | CF48 1SN | 2016 |
| Gavin Home Improver Ltd | Joiners & carpenters | CF48 1AB | 2016 |
| Gen Tech Electric Ltd | Electricians | CF48 1HW | 2021 |
| Giles & Sons Rail Ltd | Builders | CF48 2ED | 2016 |
| Gs Williams Ltd | Electricians | CF48 1RE | 2025 |
| Gth Consrtuction (Wales) Ltd | Builders | CF48 1BS | 2014 |
| Hareva Construction Ltd | Builders | CF48 2SR | 2019 |
| Heatflo Ltd | Plumbing & heating | CF48 4AQ | 2026 |
| Heathome (UK) Ltd | Plumbing & heating | CF48 1SN | 2014 |
| Home & Dry (Merthyr Tydfil) Ltd | Builders | CF48 2SR | 2007 |
| Honey Combes Hair Ltd | Hair & beauty | CF48 2SR | 2024 |
| Hze Solutions Ltd | Electricians | CF48 4ET | 2026 |
| Ir Energy Holdings Ltd | Electricians | CF48 3HD | 2024 |
| Ir Energy Ltd | Electricians | CF48 2AX | 2023 |
| Islwyn Pugh Construction Ltd | Joiners & carpenters | CF48 2SR | 2005 |
| J C Lynn Contracting Services Ltd | Gardeners & landscapers | CF48 1SF | 2017 |
| J K S Auto Services Ltd | Garages & mechanics | CF48 3TD | 2022 |
| J&J Garage Service'S Ltd | Garages & mechanics | CF48 2SR | 2023 |
| Jaffa Scenic Construction Ltd. | Painters & decorators | CF48 1PE | 2019 |
| Jamar Building Ltd | Roofers | CF48 2SR | 2025 |
| Jbh Decorating Ltd | Painters & decorators | CF48 1SB | 2026 |
| Jgh Construction Solutions Ltd | Builders | CF48 4PH | 2026 |
| Jhe System Services Ltd | Electricians | CF48 4QB | 2022 |
| Jo'S Beautician Ltd | Hair & beauty | CF48 3LB | 2022 |
| Jodan Contracts Ltd | Builders | CF48 2SR | 2015 |
| Jones Building Ltd | Builders | CF48 4JA | 2017 |
| Jpw Surfacing Ltd | Groundworks & demolition | CF48 4HF | 2020 |
| K.C Groundworks & Civils Ltd | Builders | CF48 1JN | 2021 |
| K.S.Regan Electrical Ltd | Electricians | CF48 2AQ | 2017 |
| Karl Jones Plumbing & Heating Services Ltd | Plumbing & heating | CF48 3PE | 2004 |
| Kelray Ltd | Builders | CF48 4DR | 1998 |
| Kendry Commercial Cleaning Ltd | Cleaners | CF48 1AB | 2025 |
| Ladybirds Hair Centre Ltd | Hair & beauty | CF48 2SR | 2009 |
| Laystone Construction Ltd | Builders | CF48 4LT | 2017 |
| Lb Systems Electrical Ltd | Electricians | CF48 1RQ | 2025 |
| Letts Refurb Ltd | Builders | CF48 1AY | 2022 |
| Lewis Falkiner Properties Ltd | Builders | CF48 3TD | 2016 |
| Lightning Solutions (Wales) Ltd | Electricians | CF48 2SR | 2013 |
| Lightning Solutions Ltd | Electricians | CF48 1RP | 2020 |
| Lightweight Roofing & Building Solutions Ltd | Builders | CF48 1TJ | 2019 |
| Llc Services Ltd | Builders | CF48 4TQ | 2019 |
| Logantroyrail Ltd | Builders | CF48 4DJ | 2024 |
| Louwis Groundworks Ltd | Builders | CF48 1LN | 2018 |
| Lrm Maintenance and Construction Ltd | Builders | CF48 3RR | 2019 |
| Luke Dummett Bricklaying Ltd | Builders | CF48 1RZ | 2016 |
| Lw Housing Refurbishments Ltd | Builders | CF48 2DW | 2018 |
| M & S Roller Shutter Doors Ltd | Builders | CF48 2SR | 2008 |
| M Higgins Services Ltd | Builders | CF48 1SB | 2019 |
| M. Delacey & Sons (Holdings) Ltd | Builders | CF48 3TD | 1994 |
| M.D. Body Repairs Ltd | Garages & mechanics | CF48 2SR | 2016 |
| M.E.R.S. Holdings Ltd | Builders | CF48 1RY | 2022 |
| M.R.S Electrical Services Ltd | Electricians | CF48 2SR | 2023 |
| Maintenance Matters Merthyr Ltd | Builders | CF48 2SR | 2026 |
| Mali Construction (South Wales) Ltd | Joiners & carpenters | CF48 4TQ | 2022 |
| Matcon Civil Engineering Ltd | Builders | CF48 4NL | 2010 |
| Matcon Plant Ltd | Builders | CF48 4NL | 2021 |
| Mate Electrical and Renewables Ltd | Electricians | CF48 4QA | 2022 |
| Md Services (Penderyn) Ltd | Garages & mechanics | CF48 2SR | 2012 |
| Mdgroundworks Ltd | Groundworks & demolition | CF48 4PU | 2026 |
| Mdl Electrical & Renewables Ltd | Electricians | CF48 3TD | 2011 |
| Merthyr Salvage Ltd | Groundworks & demolition | CF48 2TA | 2003 |
| Merthyr Tyres and Exhaust Services Ltd | Garages & mechanics | CF48 2BW | 2005 |
| Mgr Civils Ltd | Builders | CF48 1SP | 2020 |
| Millennial Groundworks Ltd | Builders | CF48 2DS | 2022 |
| Minerva Construction (UK) Ltd | Builders | CF48 3NY | 2017 |
| Mj 93 Construction Ltd | Builders | CF48 2DH | 2019 |
| Msw Property Developments Ltd | Builders | CF48 4DR | 2024 |
| N Dudley Services Ltd | Builders | CF48 3LA | 2019 |
| Natural Affinity Therapy Ltd | Hair & beauty | CF48 2SR | 2024 |
| Neyo'S Number 1 Ltd | Hair & beauty | CF48 1NN | 2026 |
| P & C Building & Management Solutions Ltd | Builders | CF48 2SR | 2016 |
| Park Heating & Gas Services Ltd | Plumbing & heating | CF48 1PB | 2018 |
| Pfl Painting and Decorating Ltd | Painters & decorators | CF48 4DG | 2018 |
| Philip Price Commercial Vehicle Services Ltd | Garages & mechanics | CF48 4AP | 2015 |
| Phoenix Fencing & Construction Ltd | Builders | CF48 4DR | 2021 |
| Platinum Carpentry & Roofing Ltd | Builders | CF48 3TD | 2025 |
| Power Solutions Electrical Contractors Ltd | Electricians | CF48 4DR | 2025 |
| Price Home Developments Ltd | Builders | CF48 1BB | 2023 |
| Price Pro-Construct Ltd | Builders | CF48 1BB | 2020 |
| Prolec Energy Solutions Ltd | Electricians | CF48 1YF | 2022 |
| Qdl Contractors Ltd | Builders | CF48 4DR | 2007 |
| R Harris Solutions Ltd | Electricians | CF48 3AG | 2014 |
| Rampys Construction Ltd | Painters & decorators | CF48 4LB | 2025 |
| Raw Electrical Engineering Solutions Ltd | Electricians | CF48 1SA | 2018 |
| Rd Construction & Maintenance Ltd | Builders | CF48 4DR | 2018 |
| Rees Electrical Solutions Ltd | Electricians | CF48 3TE | 2019 |
| Rgj Building Services Ltd | Builders | CF48 1NJ | 2015 |
| Rici Ltd | Builders | CF48 4HE | 2019 |