| Llandovery Caravan & Camping Park Limited | Hospitality | 2012 |
| Llanelli Southern Fried Chicken (2004) Limited | Hospitality | 2004 |
| Llanelli Specsavers Limited | Wholesale & retail | 1997 |
| Llanelly Athletic Association Limited(The) | Arts & recreation | 1953 |
| Llangadog Angling Limited | Agriculture & fishing | 2007 |
| Llys-Y-Gorlan Limited | Agriculture & fishing | 2008 |
| M G Thomas Ltd | Professional & scientific | 2007 |
| M&K Cuckoo Ltd | Extraterritorial | 2026 |
| M&K Goldfinch Ltd | Extraterritorial | 2026 |
| M&K Magpie Ltd | Extraterritorial | 2026 |
| M.P.A. Network Solutions Ltd | Information & communication | 2007 |
| Malcolm Herbert Plant Hire Limited | Administrative & support | 2000 |
| Mark the Spark Limited | Information & communication | 2007 |
| Martin Levan Sound Design Limited | Information & communication | 1984 |
| MAX Evans Menswear Limited | Wholesale & retail | 2003 |
| ME General Factors Limited | Wholesale & retail | 2015 |
| Means Renewal Limited | Construction | 1998 |
| Melingoed Limited | Manufacturing | 1999 |
| Mitec Group Ltd | Information & communication | 2007 |
| MM Accountancy Limited | Professional & scientific | 2006 |
| Morgan Property Developments Group Ltd | Real estate | 2022 |
| Morse PM Services Limited | Information & communication | 2015 |
| Neuromantics Design Limited | Information & communication | 2026 |
| Nigel Williams Chemists Limited | Wholesale & retail | 1998 |
| Octavian Development & Construction Limited | Construction | 2024 |
| Otter Textiles Limited | Wholesale & retail | 2021 |
| Outdoor KIT 4 U Limited | Wholesale & retail | 2006 |
| Penlan Properties(Carmarthen)Limited | Real estate | 1964 |
| Pili Pala Power Limited | Construction | 2025 |
| PL Consultancy Ltd | Other services | 2007 |
| Plastics Recycling Limited | Water & waste | 2003 |
| Priday Productions Limited | Information & communication | 2000 |
| R.I.B. - Koti Limited | Manufacturing | 1975 |
| Rallye Tribute Limited | Professional & scientific | 2009 |
| Record Industrial Brushes Limited | Manufacturing | 1978 |
| Red DOT (Cymru) Ltd | Financial services | 2001 |
| Red Kite Music Limited | Information & communication | 2002 |
| Red Kite Records Limited | Information & communication | 1986 |
| Redwood Dale Limited | Real estate | 1983 |
| REP Transport Ltd | Transport & logistics | 2018 |
| Richard Wayne Reynolds Ltd | Construction | 2012 |
| Riverleaxtra Limited | Wholesale & retail | 2007 |
| RM & EE Davies Limited | Hospitality | 1998 |
| Rock Apparel Limited | Wholesale & retail | 2022 |
| Ronnie S Evans Developments Limited | Real estate | 2003 |
| Savenger CFM Limited | Construction | 2011 |
| Shelco Limited | Administrative & support | 1999 |
| Siân Turvey Ltd | Professional & scientific | 2019 |
| Skanda Vale Hospice Trading Limited | Hospitality | 2023 |
| Steadman Jones Limited | Professional & scientific | 2002 |
| Steelrite Engineering Limited | Manufacturing | 2003 |
| Strong Systems Limited | Administrative & support | 2007 |
| Svek Computing Limited | Information & communication | 1987 |
| Swansea Amateur Anglers Association Limited | Arts & recreation | 1962 |
| T. Worthington & SON Storage Solutions (Wales) Limited | Administrative & support | 2006 |
| Tanlan Training Limited | Professional & scientific | 2005 |
| Teifi Concrete Ltd | Manufacturing | 2023 |
| Teifi Self Storage Ltd | Transport & logistics | 2024 |
| Teifi Valley Building Supplies Limited | Wholesale & retail | 1984 |
| Teilo Taxis Ltd | Transport & logistics | 2017 |
| THE Finance X Change (Wales) Ltd | Financial services | 2004 |
| THE FUN House Properties Ltd | Real estate | 2021 |
| THE Kenfred Company Limited | Real estate | 1960 |
| THE Old Creamery Management (South Wales) Ltd | Construction | 2020 |
| THE Pearl Market Limited | Manufacturing | 2002 |
| THE Playroom Management Services Ltd | Health & social care | 1998 |
| Thomas Enterprises (Carmarthen) Limited | Manufacturing | 2002 |
| Top 10 Limited | Professional & scientific | 2000 |
| Total Construction (Llandeilo) Ltd | Construction | 2022 |
| TR14 Properties Ltd | Real estate | 2025 |
| Treharne-Jones Associates Limited | Construction | 2006 |
| TSM CAD Design Limited | Information & communication | 2007 |
| Union Trail Properties Limited | Real estate | 1975 |
| Video Arts Group Limited | Information & communication | 1999 |
| Video Arts Limited | Information & communication | 1971 |
| Vitawell Limited | Professional & scientific | 2003 |
| Warehouse & Industrial Developments Limited | Administrative & support | 1985 |
| West Wales Aerials Limited | Wholesale & retail | 2003 |
| Wills Planning Services Ltd | Administrative & support | 2014 |
| Zeleo Ltd | Professional & scientific | 2018 |