| 2D Networks Ltd | Extraterritorial | 2001 |
| 2D Strength & Fitness Limited | Arts & recreation | 2015 |
| 2DAY0 Limited | Information & communication | 2021 |
| 2FRANKIES Ltd | Real estate | 2025 |
| 2K Coffee & Deli Ltd | Hospitality | 2025 |
| 2K Electrical Wholesale Limited | Wholesale & retail | 2014 |
| 2K'S Ltd | Real estate | 2023 |
| 2ML Ltd | Information & communication | 2008 |
| 2ND Home Furniture Ltd | Wholesale & retail | 2012 |
| 2TAPS Wine Bar Limited | Professional & scientific | 2023 |
| 2TAPSCATERING Ltd | Hospitality | 2024 |
| 3 Bros Property Ltd. | Real estate | 2020 |
| 3 Little Desserts Limited | Manufacturing | 2017 |
| 3 PT Ltd | Arts & recreation | 2010 |
| 3 to 5 Club (Ireland) Ltd | Administrative & support | 2026 |
| 3 Wise MEN Pubs Ltd | Hospitality | 2017 |
| 30 Wellington Park Limited | Households | 2018 |
| 30/30 Hospitality Ltd | Health & social care | 2015 |
| 30042509 Ltd | Professional & scientific | 2023 |
| 3131 Electrical Ltd | Mining & quarrying | 2015 |
| 316 Mein Limited | Hospitality | 2024 |
| 3173 Limited | Professional & scientific | 2005 |
| 32 Cliftonville Avenue the Management Company (2007) Limited | Households | 2007 |
| 321 Sell IT Ltd | Wholesale & retail | 2021 |
| 328 Pathology Limited | Health & social care | 2020 |
| 32UMP Ltd | Health & social care | 2015 |
| 33 Motorsport Limited | Arts & recreation | 2014 |
| 33 South Management Company Limited | Households | 2019 |
| 330WF106 Limited | Professional & scientific | 2004 |
| 349 Beersbridge Road Apartments Management Company Limited | Households | 2003 |
| 34A Trading Limited | Arts & recreation | 2017 |
| 352 Medical Limited | Health & social care | 2005 |
| 360 Cloud Accounting Ltd | Professional & scientific | 2018 |
| 360 IT Consultancy Ltd | Information & communication | 2012 |
| 360 JGF Ltd | Administrative & support | 2021 |
| 360 Laser Solutions Ltd | Manufacturing | 2019 |
| 360 Production Limited | Information & communication | 2008 |
| 360 Residential Ltd | Real estate | 2017 |
| 365 Football Management Limited | Arts & recreation | 2017 |
| 365AUTOMATE Ltd | Information & communication | 2020 |
| 367-371 Beersbridge Road Apartment Management Company Limited - the | Households | 2007 |
| 368 Properties Ltd | Financial services | 2020 |
| 37 Lombard Street Ltd | Real estate | 2026 |
| 379 Social Limited | Hospitality | 2016 |
| 389 Automotive Ltd | Wholesale & retail | 2022 |
| 3AHG Ltd | Information & communication | 2020 |
| 3B Global Consulting Ltd | Professional & scientific | 2025 |
| 3CS Coffee Bar Ltd | Hospitality | 2025 |
| 3CSCOFFEBAR Ltd | Wholesale & retail | 2025 |
| 3D Imito Ltd | Hospitality | 2017 |
| 3D Personnel (NI) Limited | Administrative & support | 2015 |
| 3D2 Design Ltd | Professional & scientific | 2020 |
| 3DEO NI Limited | Professional & scientific | 2015 |
| 3DSC Ltd | Professional & scientific | 2020 |
| 3E Imaging Ltd | Health & social care | 2024 |
| 3G Restaurant NI Ltd | Hospitality | 2019 |
| 3JR Properties Ltd | Construction | 2026 |
| 3N Diagnostics Limited | Professional & scientific | 2013 |
| 3PCONSULTING 2026 Limited | Wholesale & retail | 2026 |
| 3RD Element Ltd | Hospitality | 2025 |
| 3RD Sector Finance Limited | Professional & scientific | 2016 |
| 3Y Group Limited | Financial services | 2020 |
| 4 Accident Management Ltd | Wholesale & retail | 2024 |
| 4 Corners Festival | Other services | 2016 |
| 4 U Clean Ltd | Administrative & support | 2024 |
| 40/40 Healthcare Limited | Health & social care | 2015 |
| 41 Adelaide Park Management Company Ltd | Households | 2025 |
| 417 Antrim Road Management Company Ltd | Households | 2011 |
| 42 Genetics Ltd | Professional & scientific | 2019 |
| 42 Wolseley Street Management Limited | Real estate | 2018 |
| 42-48 Upper Newtownards Road Management Ltd | Households | 2017 |
| 43 Ranfurly Avenue Bangor Limited | Households | 2011 |
| 430 Management Ltd | Other services | 2020 |
| 45/47 Byrne Road Management Limited | Real estate | 2019 |
| 46 Homes Limited | Real estate | 2017 |
| 47 Crawfordsburn Road Management Company Limited | Households | 2008 |
| 47 Magdala Street Management Company Limited | Households | 2021 |
| 474 Shore Road Management Company Limited | Households | 2025 |
| 486 Antrim Road NI Management Company Limited | Households | 2026 |
| 49 Deerpark Ltd | Energy | 2020 |
| 4C Executive Placement Ltd | Administrative & support | 2013 |
| 4FRONT Financial Management LLP | | 2024 |
| 4G Logistics Ltd | Transport & logistics | 2022 |
| 4M Diamonds Limited | Manufacturing | 2025 |
| 4TONIC Data (NI) Limited | Information & communication | 2024 |
| 4URPHONE (2016) Ltd | Information & communication | 2016 |
| 4WARD IT Ltd | Information & communication | 2022 |
| 5 D Design Ltd | Professional & scientific | 2018 |
| 50 East Ltd | Wholesale & retail | 2026 |
| 50 EIA Street Management Company Limited | Households | 2022 |
| 501 Properties Limited | Households | 2019 |
| 52 the Mount Management Company Limited | Households | 2006 |
| 535 Websites Ltd | Information & communication | 2025 |
| 54 North Design Ltd | Professional & scientific | 2017 |
| 55-57 Malone Road Management Limited | Extraterritorial | 2000 |
| 5678 Elite Dance Events Limited | Arts & recreation | 2015 |
| 57 Atlantic Avenue Management Company Limited | Households | 2023 |
| 58PROP001 Ltd | Real estate | 2022 |
| 5B Property Solutions Ltd | Real estate | 2026 |
| 5TJ Limited | Real estate | 2015 |