| KD Assessments Ltd | Health & social care | 2022 |
| Kore Kitchens Ltd | Construction | 2026 |
| KP Primary Care Service Ltd | Health & social care | 2018 |
| Kuran Barbers Ltd | Other services | 2025 |
| Kyota Courier Limited | Transport & logistics | 2025 |
| L & a Property Ltd | Real estate | 2018 |
| L M R Global Limited | Administrative & support | 2012 |
| L S Hill Carpentry Maesteg Limited | Manufacturing | 2023 |
| L&V Oatley Ltd | Construction | 2025 |
| Lad's Electrical Ltd | Construction | 2019 |
| Lamatherm Products Limited | Manufacturing | 1989 |
| LAR Property Management Ltd | Households | 2025 |
| LD Technical Services Limited | Professional & scientific | 2011 |
| Legend Pharma Ltd | Wholesale & retail | 2025 |
| LH Luxe Limited | Wholesale & retail | 2025 |
| Life Line Training & Operations Limited | Education | 2022 |
| Lifesyncai Ltd | Information & communication | 2025 |
| Link-Up Care | Other services | 2010 |
| Little Acorns Day Care Nursery Limited | Health & social care | 2006 |
| Little Paddocks (Maesteg) CIC | Other services | 2026 |
| Little Stars (Maesteg) Limited | Health & social care | 2016 |
| Llynfi Car Sales Limited | Wholesale & retail | 2026 |
| Llynfi Valley Tree & Garden Services Limited | Agriculture & fishing | 2009 |
| LMB Bathrooms Limited | Construction | 2025 |
| LOC Sales Ltd | Wholesale & retail | 2026 |
| Logicas Tech Limited | Information & communication | 2025 |
| LS Electrical Systems Ltd | Construction | 2016 |
| LTE Plumbing Solutions Ltd | Construction | 2017 |
| Lucal Services Limited | Manufacturing | 2025 |
| Lucid Restoration Ltd | Administrative & support | 2025 |
| M.B.E Electrical Limited | Construction | 2023 |
| M.E.T. Fabrications (Maesteg) Ltd | Manufacturing | 2001 |
| M.I.Morris & Co. Ltd. | Professional & scientific | 2004 |
| M.J.Ceilings & Partitions Ltd | Construction | 2004 |
| Maesteg Barber Ltd | Other services | 2024 |
| Maesteg Celtic Limited | Hospitality | 2019 |
| Maesteg Hand Car Wash Ltd | Administrative & support | 2016 |
| Maesteg Harlequins (TIR Iarll) R.F.C. Limited | Arts & recreation | 2019 |
| Maesteg Nails 117 Ltd | Other services | 2025 |
| Maesteg Rugby Football Club Limited | Arts & recreation | 2025 |
| Maesteg Spice Ltd | Hospitality | 2024 |
| Mali Touch Therapy Limited | Health & social care | 2023 |
| Marciano Project Management Ltd | Extraterritorial | 2013 |
| Marmor Memorials & SON Limited | Manufacturing | 2011 |
| Mayway Properties Ltd | Real estate | 2026 |
| MB Operators Limited | Construction | 2016 |
| MDW Engineering Ltd | Professional & scientific | 2023 |
| Menter BRO Ogwr | Education | 2005 |
| Merlin Defence Ltd | Public administration | 2025 |
| Mike Stanton Logistics Ltd | Transport & logistics | 2026 |
| Military Precision Cleaning Services Limited | Administrative & support | 2019 |
| Milo and Poppy Ltd | Hospitality | 2026 |
| Mixermanwales Ltd | Construction | 2012 |
| Moore and More Properties Limited | Real estate | 2019 |
| Morisumi Holdings Co Ltd | Wholesale & retail | 2025 |
| Motech IT Limited | Information & communication | 2015 |
| MRE Lettings Limited | Real estate | 2026 |
| MRE Money Limited | Administrative & support | 2026 |
| MRE Surveys Limited | Administrative & support | 2026 |
| MUD & Plunder Ltd | Wholesale & retail | 2025 |
| MW Electrical Service Limited | Construction | 2014 |
| My Aesthetics South Wales Ltd | Other services | 2021 |
| Mythily & SON Garn Ltd | Wholesale & retail | 2013 |
| Nantyffyllon Rugby Football Club Limited | Arts & recreation | 2018 |
| NBS Traders Ltd | Wholesale & retail | 2023 |
| New Horizons Children's Homes Limited | Health & social care | 2019 |
| Newstyle Barber Maesteg Ltd | Other services | 2025 |
| Nicholas Dixon Electrical Services Limited | Construction | 2013 |
| Nikita Deshpande Limited | Wholesale & retail | 2025 |
| NNA UK PVT Ltd | Wholesale & retail | 2022 |
| Noddfa Chapel Community Project Limited | Education | 1998 |
| Novel Swan Pharma Limited | Wholesale & retail | 2021 |
| NR Aesthetics Ltd | Health & social care | 2025 |
| NSG Retail Ventures Ltd | Wholesale & retail | 2024 |
| Obice Bidco Limited | Financial services | 2019 |
| Obice Midco Limited | Financial services | 2019 |
| Obice Topco Limited | Financial services | 2019 |
| Old Drill Hall Ltd | Real estate | 2001 |
| One OFF Woodwork Ltd | Manufacturing | 2021 |
| OP Maesteg LLP | | 2022 |
| Owen E.Jones and Company Limited | Other services | 1950 |
| O’R Galon Home Care Ltd | Health & social care | 2025 |
| Para and Co Ltd | Real estate | 2003 |
| Paris House Properties Limited | Real estate | 2024 |
| Pasham Kebab House Ltd | Hospitality | 2019 |
| Paul James & Sons Groundworks Ltd | Construction | 2017 |
| Pawsome Dog Grooming Boutique Ltd | Other services | 2024 |
| PCP Claims Guys Ltd | Administrative & support | 2026 |
| Pcpclaimchecker Ltd | Administrative & support | 2026 |
| Peckers Poultry Ltd | Agriculture & fishing | 2025 |
| Perriam Limited | Construction | 2005 |
| Perry's Vehicle Repairs Ltd | Wholesale & retail | 2018 |
| Philjen International Limited | Manufacturing | 2001 |
| Phoenix Waste Disposal Ltd | Water & waste | 2023 |
| Phoenix Windows & Doors Limited | Construction | 2014 |
| Pinpoint Passive Fire Protection Services Ltd | Public administration | 2026 |
| PJT Commercial Consultants Limited | Professional & scientific | 2017 |
| Power Mills Limited | Professional & scientific | 2003 |
| Premier Blinds (Wales) Limited | Manufacturing | 1997 |
| Premier Homes Wales Ltd | Extraterritorial | 2022 |