| 37 Corstorphine Road Limited | Construction | 2017 |
| 37EDINBURGH Ltd | Hospitality | 2019 |
| 382 Taxis Ltd. | Professional & scientific | 2007 |
| 386 Edin Limited | Professional & scientific | 2010 |
| 39 Edin Ltd. | Extraterritorial | 2006 |
| 39 Hanover Limited | Real estate | 2016 |
| 39 Scotland Limited | Wholesale & retail | 2012 |
| 39 Scottish Limited Partnership | | 2012 |
| 39 SFR Ltd | Hospitality | 2024 |
| 39 Steps Limited | Professional & scientific | 2003 |
| 39MANSIONHOUSE Limited | Professional & scientific | 2005 |
| 3A Global Solutions LP | | 2013 |
| 3BPL Ltd | Hospitality | 2025 |
| 3CAP Consulting Limited | Professional & scientific | 2009 |
| 3CLS Investments Limited | Administrative & support | 2021 |
| 3CLS Properties Limited | Real estate | 2023 |
| 3COCO Ltd | Hospitality | 2024 |
| 3D Design LAB Ltd | Professional & scientific | 2022 |
| 3D ME LP | | 2015 |
| 3D Overseas LP | | 2015 |
| 3D Pals Ltd | Wholesale & retail | 2025 |
| 3D Personnel Limited | Administrative & support | 2007 |
| 3D YOU LP | | 2015 |
| 3D-BROTHERS L.P. | | 2015 |
| 3DEEMING Solutions LP | | 2015 |
| 3DPSYDESIGN LP | | 2024 |
| 3DR Ltd | Construction | 2013 |
| 3DREID Scotland Limited | Professional & scientific | 2017 |
| 3E Development Limited | Administrative & support | 1995 |
| 3E Europe Limited | Information & communication | 1994 |
| 3G Digital LP | | 2013 |
| 3H Investments Limited | Financial services | 2002 |
| 3HELIX Management Ltd | Extraterritorial | 2012 |
| 3I 2020 Co-Investment LP | | 2019 |
| 3I Ademas LP | | 2014 |
| 3I DM US (SLF) LP | | 2012 |
| 3I GP 2019 (Scots) Limited | Financial services | 2019 |
| 3I GP 2020 Limited | Financial services | 2019 |
| 3I GP 2022 (Scots) Limited | Financial services | 2022 |
| 3I Growth Capital F LP | | 2010 |
| 3I Growth Carry a LP | | 2010 |
| 3I Growth Carry B LP | | 2010 |
| 3I Infra 2022 Warehouse LP | | 2022 |
| 3I Infra GP 2022 (Scots) Limited | Financial services | 2022 |
| 3I Media 08-10 LP | | 2008 |
| 3I Mountain LP | | 2021 |
| 3I NAI Holdings GP Limited | Financial services | 2022 |
| 3I NAI Holdings LP | | 2022 |
| 3I PE 2019-22 Warehouse LP | | 2019 |
| 3J Private Hire Ltd | Administrative & support | 2023 |
| 3MC Edinburgh Limited | Real estate | 2025 |
| 3MMMS Foods Ltd | Hospitality | 2024 |
| 3NAECOM Ltd | Wholesale & retail | 2025 |
| 3P Training Limited | Arts & recreation | 2016 |
| 3Q Ventures LP | | 2017 |
| 3R Biorecovery Limited | Other services | 2020 |
| 3R Equipment Group Ltd | Professional & scientific | 2024 |
| 3R Incorporated Limited | Financial services | 2026 |
| 3R Organics Limited | Other services | 2024 |
| 3R Solutions (Holdings) Limited | Financial services | 2014 |
| 3R Solutions Limited | Transport & logistics | 2008 |
| 3R1Y Ltd | Wholesale & retail | 2025 |
| 3SVP Limited | Real estate | 2011 |
| 3T Property Group Ltd | Real estate | 2025 |
| 4 Friends House Ltd | Hospitality | 2024 |
| 4 Million Seasons Ltd | Arts & recreation | 2023 |
| 4 Picardy Place Limited | Hospitality | 2019 |
| 4 Seasons Doors Ltd | Construction | 2021 |
| 4 Seasons Tailor Ltd | Other services | 2024 |
| 4 Wall Improvements Ltd | Construction | 2023 |
| 40 Limited | Hospitality | 2022 |
| 40 Taxis Ltd. | Professional & scientific | 2013 |
| 40 Thirlestane Road Limited | Real estate | 2023 |
| 400 NCR Management Co Limited | Extraterritorial | 2007 |
| 400 Taxis Ltd. | Extraterritorial | 2016 |
| 404 INK Limited | Information & communication | 2016 |
| 404 Projects LP | | 2014 |
| 404 Testing Ltd | Information & communication | 2024 |
| 408 Taxis Ltd. | Extraterritorial | 2010 |
| 40TREE Management Limited | Professional & scientific | 2020 |
| 411 Edin Ltd. | Professional & scientific | 2005 |
| 42 Edin Ltd. | Professional & scientific | 2004 |
| 424 Edin Ltd. | Other services | 2003 |
| 425 Taxis Ltd. | Transport & logistics | 2006 |
| 426 Scottaxis Limited | Extraterritorial | 2020 |
| 432 Edin Ltd | Transport & logistics | 2011 |
| 43AG Barber Ltd | Other services | 2025 |
| 43MP Limited | Administrative & support | 2025 |
| 44 Invest LP | | 2016 |
| 44 Strength and Fitness Ltd | Arts & recreation | 2024 |
| 44 Uppercuts Ltd | Other services | 2026 |
| 442 Design Limited | Professional & scientific | 2002 |
| 4473 Energi Ltd | Professional & scientific | 2023 |
| 450 Taxis Ltd. | Professional & scientific | 2019 |
| 457 Taxis Ltd. | Professional & scientific | 2014 |
| 463 Taxis Ltd. | Professional & scientific | 2007 |
| 468 Edin Ltd. | Extraterritorial | 2007 |
| 478 Taxis Ltd. | Professional & scientific | 2011 |
| 479 Taxis Ltd. | Professional & scientific | 2006 |
| 485AMBIGUOUS Ltd | Information & communication | 2010 |