| Ferrier-Jones and Wellings Limited | Real estate | 1956 |
| Ffinnant Limited | Financial services | 2011 |
| FGR Motorsport Limited | Wholesale & retail | 2007 |
| Finest Welsh Country Beef Ltd | Wholesale & retail | 2022 |
| Flightworld Ltd | Transport & logistics | 2018 |
| Forden Manufacturers (Hardwoods) Limited | | 1978 |
| Forestry Services Limited | Agriculture & fishing | 2005 |
| Franks Fasteners Limited | Wholesale & retail | 2024 |
| FU ZE Garden Limited | Hospitality | 2016 |
| Fuze Limited | Wholesale & retail | 2003 |
| G J Taggart Limited | Professional & scientific | 2005 |
| G N Morgan & Co Limited | Construction | 2003 |
| Geary Graham Davies Limited | Real estate | 2007 |
| Gemsport Limited | Other services | 2008 |
| Geraint Roberts Associates Limited | Professional & scientific | 2021 |
| Gilbert Davies & Partners Limited | Professional & scientific | 2007 |
| Glaswall Systems Limited | Wholesale & retail | 1983 |
| Glenmile Limited | Construction | 2005 |
| Glwydcaenewydd Ltd | Agriculture & fishing | 2007 |
| Glyndwr Timber Frame Limited | Administrative & support | 1998 |
| Golfa Hall Hotel Limited | | 1985 |
| Great Cantal Estate Limited | Real estate | 2007 |
| Green Light & Power Co. Limited | Energy | 2007 |
| Green Roads Surfacing & Recycling Ltd | Extraterritorial | 2015 |
| GRP Services Brecon Ltd | Administrative & support | 2006 |
| Gwardolau Partnership | | 1985 |
| Haire Landscape Consultants Limited | Administrative & support | 2007 |
| Happy Horse Retirement Limited | Agriculture & fishing | 2002 |
| Hardwood Focus Limited | Professional & scientific | 2007 |
| Hawthorns Projects Limited | Professional & scientific | 2004 |
| Heartwood Group Holdings Ltd | Financial services | 2026 |
| Hiraeth Services Limited | Health & social care | 2007 |
| Honey Cafe Limited | Hospitality | 2003 |
| HTB Consult Limited | Professional & scientific | 2002 |
| Humphrey Feeds Limited | Extraterritorial | 1966 |
| Humphrey Poultry (Holdings) Ltd | Extraterritorial | 2022 |
| Humphrey Pullets Limited | Extraterritorial | 2008 |
| I B Williams & SON Ltd | Manufacturing | 2003 |
| IAN Gibb Leisure Limited | Wholesale & retail | 2000 |
| Information Art (DS) Limited | Information & communication | 1996 |
| Insula Electrical Limited | Construction | 2025 |
| Interim Accounting & Management Ltd | Professional & scientific | 2007 |
| Intramate Limited | | 1981 |
| Invertek Drives Limited | Manufacturing | 1998 |
| Investnet Group U.K. Ltd | Real estate | 2024 |
| J a Francis & Sons Limited | Manufacturing | 2004 |
| J and W Sport Ltd | Arts & recreation | 2003 |
| J E Jones & SON Milling Limited | Agriculture & fishing | 2007 |
| J.B. Roberts and SON Limited | Construction | 2006 |
| J.B.K. Engineering Ltd | Construction | 2003 |
| J.I.H. Jones & Son(Erwgilfach)Limited | Agriculture & fishing | 1964 |
| J.L. Griffiths & Co. (Llandrindod Wells) Limited | Construction | 1964 |
| J.L. Stephens Limited | Construction | 2002 |
| James Memorials Limited | Other services | 2002 |
| Jimmy Hughes Services Limited | Administrative & support | 2003 |
| JON Gilbert Carpet & Flooring Limited | Construction | 2002 |
| K.P.2 Limited | Agriculture & fishing | 1996 |
| K1 Developments (BC) Ltd | Construction | 2016 |
| Kapam Properties Limited | Real estate | 2003 |
| Kerimeg Nurseries Limited | Agriculture & fishing | 1999 |
| Kevin Evans Limited | Agriculture & fishing | 2003 |
| Kevin Jones Cars Limited | Wholesale & retail | 2003 |
| Key Mediators Limited | Other services | 2025 |
| Kittiwake-Books Limited | Information & communication | 2002 |
| Knole Properties Limited | Real estate | 1928 |
| Laborde Capital Limited | Financial services | 2005 |
| Lawgrind Limited | Extraterritorial | 1967 |
| Layton Consultants Limited | Professional & scientific | 2013 |
| LEE Investment Properties Limited | Real estate | 2002 |
| Legal-Secretary Limited | Administrative & support | 2005 |
| LEH Homes Ltd | Construction | 2018 |
| Lightworks FX Ltd | Administrative & support | 2000 |
| Lindwell Limited | | 1986 |
| Livewell Homes Limited | Construction | 2019 |
| Llandrindod Wells Bowling Club Limited | Arts & recreation | 2016 |
| Llandrindod Wells Football Club Limited | Arts & recreation | 2016 |
| Llangorse Sailing School Limited | Arts & recreation | 1995 |
| Llani Holiday Parks Ltd | Hospitality | 2011 |
| Lurking Truth | Arts & recreation | 1998 |
| M a Evans Transport Limited | Transport & logistics | 1969 |
| M G Burgins & SON Limited | Wholesale & retail | 2004 |
| M H P Powell Limited | Construction | 2007 |
| M K Morgan Limited | Transport & logistics | 2003 |
| M.E.D. Supplies Limited | Wholesale & retail | 1990 |
| Maes Mawr Management Company Limited | Professional & scientific | 2004 |
| Maesmawr Group Limited | Other services | 2019 |
| Makefast Limited | Manufacturing | 1974 |
| Marches Architectural Hardware Limited | Wholesale & retail | 2004 |
| Marquees Over Shropshire Limited | Administrative & support | 2004 |
| Meifod Valley Lodges Ltd | Hospitality | 2019 |
| MHP Industrial Limited | Construction | 2013 |
| Michael Rowlands Limited | Construction | 2004 |
| MID Wales Airport Limited | Transport & logistics | 2002 |
| MID Wales Auto Limited | Wholesale & retail | 1999 |
| MID Wales Guttering Limited | Construction | 2003 |
| MID Wales Storage and Distribution Centre Limited | Administrative & support | 1998 |
| MID Wales Tourism - Cwmni Twristiaeth Canolbarth Cymru | Information & communication | 1991 |
| Milwyn Jenkins & Jenkins Limited | Professional & scientific | 2007 |
| Moonstone Projects Ltd | Professional & scientific | 2005 |
| Morgan Lloyd & SON Limited | Construction | 2002 |