| Harveys Garden Buildings Limited | Wholesale & retail | 2009 |
| Hassett Group Ltd | Professional & scientific | 2016 |
| Hawker Shoes Limited | Wholesale & retail | 2009 |
| Health Loaded Ltd | Hospitality | 2019 |
| Height Barriers Ltd | Manufacturing | 2022 |
| Herbaticus Limited | Wholesale & retail | 2000 |
| Highgate Cottages Ltd. | Hospitality | 2014 |
| Highgate Fire Engineering Limited | Professional & scientific | 2023 |
| Hillside Holiday Hub Ltd | Health & social care | 2024 |
| Hillside Holidays Limited | Hospitality | 2015 |
| Hillside Park Phase 1 RTM Company Limited | Households | 2016 |
| Hillside Security Services Ltd | Administrative & support | 2022 |
| Hilltop Food Group Limited | Manufacturing | 2014 |
| Hilltop Honey Limited | Extraterritorial | 2026 |
| Hinterland Group Limited | Financial services | 2024 |
| Hinterland Properties Limited | Construction | 2021 |
| HJR Consultants Limited | Professional & scientific | 2013 |
| HLS Products Limited | Manufacturing | 2009 |
| HM Veterinary Services Limited | Professional & scientific | 2017 |
| Hodo Management Consulting Ltd | Real estate | 2013 |
| Honest Empire Ltd | Information & communication | 2012 |
| Hope Church (Newtown) | Other services | 2007 |
| Hope Day Nursery C.I.C. | Health & social care | 2019 |
| Horsehay Estate Services Limited | Real estate | 2014 |
| Howells Fuel Oils | Wholesale & retail | 2015 |
| Hub of Hope Foundation | Other services | 2021 |
| Hummingbird Lounge Ltd | Hospitality | 2025 |
| Hydra Luxe Powders Ltd | Wholesale & retail | 2025 |
| Idris's Barbers Ltd | Other services | 2023 |
| Ikat Limited | Professional & scientific | 2014 |
| Imobilecare Ltd | Wholesale & retail | 2024 |
| Imoticon Drives Ltd | Wholesale & retail | 2017 |
| Imperial Business Services (Accountants) Ltd | Professional & scientific | 2022 |
| Innova Mill (Holdings) Limited | Manufacturing | 2014 |
| Inter County Pilot Service Limited | Transport & logistics | 2011 |
| International Special Training Facility - Covert Operations Limited | Administrative & support | 2015 |
| Ironcraft Fires & Stoves Limited | Wholesale & retail | 2011 |
| Isaac Forestry Limited | Manufacturing | 2023 |
| IVS Systems Ltd | Wholesale & retail | 2023 |
| J & W Game Limited | Arts & recreation | 2009 |
| J a Jandrell Limited | Construction | 2003 |
| J C Evans Limited | Agriculture & fishing | 2013 |
| J D Wind Limited | Manufacturing | 2017 |
| J Humphreys Ground Works Ltd | Administrative & support | 2017 |
| J R T Jones (Newtown) Limited | Construction | 2005 |
| J Waters Electrical Limited | Construction | 2025 |
| J. Richards (Developments) Limited | Real estate | 1994 |
| Jabin - Powys Ltd | Hospitality | 2019 |
| Jacks Cafe & Restaurant Ltd | Hospitality | 2020 |
| James Bevan Photography Ltd | Professional & scientific | 2025 |
| James Llandinam Limited | Hospitality | 2023 |
| Jashbet Holdings Ltd | Information & communication | 2016 |
| Jason Boxall Ltd | Administrative & support | 2013 |
| JBS Products & Events Ltd | Arts & recreation | 2014 |
| JJP Property Limited | Real estate | 2022 |
| JJP Services Limited | Construction | 2015 |
| JMC Strength Limited | Professional & scientific | 2019 |
| JMM Consultancy Limited | Administrative & support | 2015 |
| JOA Plumbing Ltd | Construction | 2023 |
| John Morrish Limited | Manufacturing | 2010 |
| JPL Solicitors Limited | Professional & scientific | 2023 |
| JRW Roofing Limited | Construction | 2022 |
| Jtilc Limited | Professional & scientific | 2021 |
| K & J Powys Limited | Real estate | 2003 |
| K Mehta Limited | Health & social care | 2008 |
| K Neal Property Ltd | Real estate | 2025 |
| K'S Garage Newtown Ltd | Wholesale & retail | 2025 |
| Kaha Sports Therapy Ltd | Arts & recreation | 2024 |
| Karablok Holdings Limited | Financial services | 2016 |
| Karablok UK Ltd | Manufacturing | 2016 |
| KCA Kitchens Ltd | Wholesale & retail | 2020 |
| Keaytech Ltd | Mining & quarrying | 2020 |
| Kerry Community Hub Community Interest Company | Wholesale & retail | 2026 |
| Kerry Vale Free Range Eggs Limited | Agriculture & fishing | 2009 |
| Kerry Vale Luxury Escapes Limited | Extraterritorial | 2021 |
| Kerry Vale Vets Limited | Professional & scientific | 2022 |
| Kerry Vale Vineyard Limited | Manufacturing | 2019 |
| Kettlebell Fever Ltd | Wholesale & retail | 2010 |
| Kevin Neal Services Limited | Real estate | 2023 |
| KF Promotions Ltd | Arts & recreation | 2020 |
| Kidwells Whittakers Accounting Limited | Professional & scientific | 2015 |
| Kinetic Outcomes Training Ltd | Education | 2025 |
| KJM Forestry Ltd | Agriculture & fishing | 2017 |
| Kpmr International Ltd | Administrative & support | 2021 |
| Kruger Properties Limited | Real estate | 1997 |
| KWR Housing Ltd | Real estate | 2020 |
| KWR Pro Limited | Real estate | 2007 |
| L and J Plastering Limited | Construction | 2021 |
| L F Fencing Limited | Agriculture & fishing | 2021 |
| L&A PM Services Ltd | Administrative & support | 2023 |
| LAB Business Services Ltd | Professional & scientific | 2024 |
| Labramos Ltd | Professional & scientific | 2024 |
| Launder Farm Experience Days Ltd | Agriculture & fishing | 2018 |
| Lavoro Design Holdings Ltd | Financial services | 2020 |
| Lavoro Design Ltd | Manufacturing | 2017 |
| LC Consultancy & Services Ltd | Administrative & support | 2023 |
| LE Pouget Limited | Administrative & support | 1996 |
| LES Powys Ltd | Construction | 2024 |
| LES Pratt Consultancy Limited | Health & social care | 2012 |
| Lewis Agricultural Limited | Agriculture & fishing | 2023 |