| Fortex Fire & Security Ltd | Energy | 2019 |
| Friends in Action International Northern Ireland | Construction | 2007 |
| Fruit APE Ltd | Information & communication | 2025 |
| G Brown Landscaping Ltd | Construction | 2021 |
| G. & W. Moore & Co., Limited | Wholesale & retail | 1974 |
| Garden Escapes (Ireland) Limited | Manufacturing | 2015 |
| Geocal Ltd | Wholesale & retail | 2018 |
| GF Chilled Distribution Ltd | Wholesale & retail | 2020 |
| Girls and Goals Ltd | Arts & recreation | 2024 |
| Glenshire Ltd | Professional & scientific | 2024 |
| Glenstockadale Forest LLP | | 2018 |
| Glenwood Comber Management Company Limited | Households | 2022 |
| Gluten Free Ireland Limited | Information & communication | 2013 |
| Gojoh Solutions Limited | Professional & scientific | 2013 |
| Gold Lounge Tanning Ltd | Health & social care | 2025 |
| Golden Arrow Media Ltd | Information & communication | 2017 |
| Good Autos Limited | Wholesale & retail | 2015 |
| Good Autos Service Centre Ltd | Wholesale & retail | 2017 |
| Good Enough Games Ltd | Information & communication | 2025 |
| Gordon & Co Ltd | Construction | 2013 |
| Grace Fellowship Church Limited | Other services | 2014 |
| Greenseat Construction Limited | Construction | 2009 |
| Greenway Gate Management Limited | Extraterritorial | 2019 |
| GS Construction (NI) Limited | Construction | 2013 |
| Hallview Farm Ltd | Agriculture & fishing | 2011 |
| Hamper Holdings Ltd | Manufacturing | 2020 |
| Hans Crosby Ltd | Construction | 2012 |
| Happy Children Day Nursery Limited | Health & social care | 2010 |
| Harehill Alpacas Ltd | Agriculture & fishing | 2022 |
| Harmac Limited | Wholesale & retail | 2019 |
| Harron K Limited | Wholesale & retail | 2015 |
| Harry's Mates Ltd | Health & social care | 2022 |
| Hawthorne Associates (S&A) Ltd | Professional & scientific | 2019 |
| Haze Payroll Ltd | Financial services | 2025 |
| Healthbeautydiyuk Ltd | Wholesale & retail | 2026 |
| Healthcare Facilities Limited | Real estate | 2004 |
| Heart of Down Rural Society Ltd | Education | 2019 |
| Herronspub Ltd | Hospitality | 2025 |
| Hillmount Cottages Management Company Limited | Households | 2020 |
| Hinch Security Ltd | Administrative & support | 2026 |
| Holmbank Holdings Limited | Real estate | 2022 |
| Hoppit Energy Ltd | Energy | 2025 |
| Hospitality Management Solutions UK & Ireland Ltd | Professional & scientific | 2016 |
| Hugh Doran Ltd | Construction | 2025 |
| IAN Moore Heating Ltd | Construction | 2010 |
| Iberian Wine Tours Limited | Administrative & support | 2010 |
| Ignite Mechanical (NI) Ltd | Construction | 2019 |
| Infraguard Limited | Manufacturing | 2019 |
| Inico Digital Limited | Information & communication | 2023 |
| Inspire Management Ltd | Professional & scientific | 2015 |
| Integro Technologies Limited | Information & communication | 2015 |
| Ireola Ltd | Professional & scientific | 2025 |
| J and Eldons Limited | Wholesale & retail | 2026 |
| J B Brown Ltd | Wholesale & retail | 2003 |
| J C Moffitt Construction Limited | Construction | 2009 |
| J Carlisle Ltd | Energy | 2025 |
| J Graham Holdings Ltd | Financial services | 2022 |
| J. Thomas Bricklaying Ltd | Construction | 2024 |
| James Mckeown & Company, Limited | Real estate | 1911 |
| JCM Joinery & Construction Ltd | Construction | 2021 |
| JCM Joinery Ltd | Construction | 2017 |
| Jennings Homes Ltd | Hospitality | 2025 |
| Jess Engineering Limited | Wholesale & retail | 2012 |
| Jkgd Ltd | Administrative & support | 2023 |
| Jmcn Properties Limited | Hospitality | 2024 |
| JNG Electrical Services Ltd | Construction | 2020 |
| John Kirkpatrick Tractors Ltd | Manufacturing | 2024 |
| John Lambe Ltd | Wholesale & retail | 2024 |
| Jones Chartered Accountants Limited | Professional & scientific | 2017 |
| JRS Accounting and Payroll Ltd | Professional & scientific | 2020 |
| Jupiter Strategic Advisors Ltd | Information & communication | 2022 |
| JV Restoration Services Ltd | Construction | 2025 |
| KA Contracts Ltd | Construction | 2025 |
| Kate Marshall Limited | Administrative & support | 2013 |
| Keel Point Group Ltd | Financial services | 2026 |
| KEEN2SWIM Ltd | Education | 2023 |
| Kellpat Limited | Financial services | 2026 |
| Kerr Tyres Ltd | Wholesale & retail | 2018 |
| Kids Store Limited | Wholesale & retail | 2002 |
| Kiernan Contracts Ltd | Construction | 2024 |
| Killard Holdings Limited | Real estate | 2025 |
| Kingswood Nutrition and Consultancy Limited | Agriculture & fishing | 2024 |
| KT Tanning Ltd | Other services | 2025 |
| L&M Retail Annahilt Limited | Wholesale & retail | 2020 |
| Lagan Design Services Ltd | Construction | 2017 |
| Lagan Valley Vineyard Church | Other services | 2013 |
| Lakeland Security Services (LS) Ltd | Administrative & support | 2025 |
| Lara Leigh Limited | Manufacturing | 2013 |
| Laurelbank Community Interest Company | Agriculture & fishing | 2024 |
| Laurelbank Farm Ltd | Agriculture & fishing | 2021 |
| Lauren Fowler Handcrafted Company Ltd | Manufacturing | 2018 |
| Lavery Consultancy Limited | Energy | 2014 |
| Lawn & Border Garden Design & Landscapes Ltd | Administrative & support | 2022 |
| Lawrence Patterson Financial Ltd | Professional & scientific | 2020 |
| Leesa Harker Ltd | Information & communication | 2013 |
| Leggygowan Eggs Limited | Agriculture & fishing | 2021 |
| Lessans Livery Service Limited | Other services | 2003 |
| Lewis Ridley Limited | Wholesale & retail | 2025 |
| Lilly Rose Design Limited | Professional & scientific | 2022 |
| Linen Fields Lenaderg Management Company Ltd | Households | 2025 |