| Curif Limited | Construction | 2015 |
| Curran Gate Management Limited | Households | 2019 |
| Cwmcc Property Lettings and Management Ltd | Real estate | 2025 |
| DA Forgie | Wholesale & retail | 2013 |
| Dammc Ltd | Construction | 2017 |
| Daniel Henry Property Management Limited | Extraterritorial | 2013 |
| Danmade Limited | Wholesale & retail | 2008 |
| Dansar Trading Limited | Wholesale & retail | 2016 |
| DARK9 Ltd | Manufacturing | 2025 |
| Daya Maya Ltd | Real estate | 2015 |
| Db&R Ltd | Wholesale & retail | 2025 |
| DC MAC Limited | Hospitality | 2016 |
| Derek a Forsythe Financial Advisors Limited | Financial services | 2006 |
| Derowen Limited | Agriculture & fishing | 2020 |
| Desertfish Productions Ltd | Education | 2022 |
| DH Property Developments Limited | Real estate | 2004 |
| Diamond Xpress Limited | Transport & logistics | 2016 |
| Distil Data Limited | Information & communication | 2025 |
| DMC Properties & Mortgages Ltd | Financial services | 2005 |
| DMR Property Ltd. | Construction | 2017 |
| Doc's Retail Ltd | Hospitality | 2026 |
| Dogleap Construction Limited | Construction | 2005 |
| Dogleap Properties Limited | Real estate | 2015 |
| Donagheady Management Company Limited | Households | 2006 |
| Donald Morgan Limited | Hospitality | 1998 |
| Doss Developments Ltd | Real estate | 2014 |
| Drenagh Farms Limited | Other services | 1960 |
| Drenagh Sawmills Limited | Manufacturing | 1974 |
| Driftline Imports Ltd | Wholesale & retail | 2025 |
| Dromdallagan Limited | Households | 2005 |
| Drumachose Mews Management Ltd | Households | 2002 |
| Drumalief Staycations NI Ltd | Hospitality | 2024 |
| Drumart Properties Limited | | 2005 |
| Drumlerry Management Company Limited | Households | 2006 |
| Drummond Forestry Limited | Agriculture & fishing | 2025 |
| Drumnahay Limited | Construction | 2021 |
| Drumsurn Contracts Ltd | Professional & scientific | 2025 |
| Drumsurn Management Company Limited | Real estate | 2006 |
| Dsmcc Commercials Ltd | Real estate | 2022 |
| Dsmcc Construction Ltd | Construction | 2017 |
| Dsmcc Properties Ltd | Construction | 2015 |
| Duffy FS Limited | Financial services | 2015 |
| Duncrun Farms Ltd | Agriculture & fishing | 2010 |
| Duncrun Fishing Lakes Ltd | Agriculture & fishing | 2015 |
| Dundarg LLP | | 2014 |
| Dunhugh Manor Management Company Limited | Households | 2004 |
| Dunluce View Apartments Ltd | Households | 2018 |
| Dunn Transport Ltd | Transport & logistics | 2023 |
| Dunnalong Road Management Company (NI) Limited | Households | 2006 |
| Dunnalong Road Management Company Limited | Households | 2004 |
| E.P.H. Supplies Ltd | Wholesale & retail | 2006 |
| Eagry Gardens Management (2) Limited | Real estate | 2017 |
| Eagry Gardens Management Limited | Households | 2005 |
| EAR of the Dog Ltd | Information & communication | 2020 |
| Eason Court Management Company Limited | Households | 2017 |
| East Strand Management Ltd | Households | 2013 |
| Eccentric Catering Ltd | Hospitality | 2024 |
| Ecosse (Victoria Terrace) Management Services Ltd | Extraterritorial | 2003 |
| Ecstasy Collections Limited | Wholesale & retail | 2026 |
| EDA Brickworks Limited | Construction | 2015 |
| EDA Construction Ltd | Construction | 2023 |
| Eemm Management Ltd | Administrative & support | 2024 |
| Eglinton Court Management (Portrush) Limited | Extraterritorial | 1990 |
| Eglinton Apartments Management Company Limited | Households | 2018 |
| Ehor Limited | Construction | 2016 |
| Eintrak Ltd | Information & communication | 2023 |
| Elite Partitions Ltd | Construction | 2018 |
| ELM Wood Green Management (NO.1) Limited | Households | 2005 |
| ELM Wood Green Management (NO.2) Limited | Households | 2005 |
| Elss Engineering Limited | Manufacturing | 2005 |
| Elss Group Limited | Professional & scientific | 2018 |
| Emdonn Limited | Construction | 2020 |
| Emerald (Ireland) Limited | Financial services | 2024 |
| Emerald Lawns (Ireland) Limited | Wholesale & retail | 2002 |
| EMS Equestrian Ltd | Arts & recreation | 2022 |
| Enkin Limited | Construction | 2016 |
| Enterprise Northern Ireland Ltd | Professional & scientific | 2000 |
| EOC Estate Agents Ltd | Real estate | 2015 |
| Erin Court Management Company Limited | Real estate | 2020 |
| EU Net-Zero Construction Group Ltd | Construction | 2026 |
| EU Solar Power Ltd | Energy | 2025 |
| Evergreen Lawns Limited | Agriculture & fishing | 2002 |
| Exclusive Caravans Ltd | Wholesale & retail | 2021 |
| Expert Recruitment & Selection Limited | Administrative & support | 2015 |
| Express Home Interiors Ltd | Wholesale & retail | 2019 |
| Fairview Apartments Management NO.1 Limited | Households | 2010 |
| Farloe Ltd | Construction | 2026 |
| Fawcetts (N.I.) Limited | Households | 1991 |
| FC Electrics Limited | Construction | 2017 |
| FCK Consultancy Limited | Professional & scientific | 2020 |
| FDL Homes Ltd | Construction | 2013 |
| Feidhlim Kelly Plumbing Limited | Construction | 2019 |
| Fermon Limited | Public administration | 2023 |
| Fincairn Cottage Management Limited | Households | 2005 |
| Finest Valeting Ltd | Administrative & support | 2021 |
| First Person Medical Ltd | Health & social care | 2023 |
| FJR Gym Limited | Arts & recreation | 2020 |
| Flow Fusion Ltd | Professional & scientific | 2024 |
| Flowco. Services Ltd | Professional & scientific | 2021 |
| Forest Side Estate Management Ltd | Households | 2009 |