| Octopus Founder Partner Limited | Financial services | 2011 |
| Octopus Growth Credit Carry Partnership LP | | 2017 |
| Octopus Senior Living CIP GP LLP | | 2022 |
| Octopus Senior Living CIP LP | | 2022 |
| Octopus Tenx Health I FP L.P. | | 2021 |
| Octopus Zenith Founder Partner LP | | 2011 |
| Octopus Zenith Opportunities III FP LP | | 2017 |
| Octopus Zenith Opportunities IV FP GP LLP | | 2021 |
| Octopus Zenith Opportunities IV FP L.P. | | 2021 |
| Ocube Consultancy Limited | Information & communication | 2014 |
| Oculos 24 Limited | Information & communication | 2024 |
| OCX Technologies LP | | 2016 |
| ODC Brands Limited | Wholesale & retail | 2019 |
| ODD Records Ltd. | Administrative & support | 2026 |
| Oddities Clothing Ltd | Wholesale & retail | 2013 |
| Oddjobs Inc Co UK Ltd | Administrative & support | 2021 |
| ODE Coffee Ltd | Wholesale & retail | 2025 |
| Odena Group LP | | 2019 |
| Odetta Ventures LP | | 2015 |
| Odico International Limited | Transport & logistics | 2019 |
| Odim (UK) Ltd | Financial services | 2023 |
| Odin & Company LP | | 2012 |
| Odin International & Company LP | | 2012 |
| Odin Strength and Conditioning Ltd | Arts & recreation | 2023 |
| Odington Commerce LP | | 2016 |
| Odnt Solutions Ltd | Information & communication | 2025 |
| Odra Property Limited | Real estate | 2024 |
| Odysseus 1 Edinburgh Carry LLP | | 2021 |
| Odysseus 1 Edinburgh Limited | Professional & scientific | 2021 |
| Odysseus Capital Management Limited | Real estate | 2011 |
| Odysseus Founder Partner LP | | 2009 |
| Odyssey Adventures Ltd | Administrative & support | 2024 |
| Odyssey Developments Limited | Wholesale & retail | 2002 |
| Odyssey Prime Property Ltd | Real estate | 2025 |
| Odyssée M LP | | 2025 |
| OE Homes Ltd | Real estate | 2024 |
| OE Light Ltd | Wholesale & retail | 2019 |
| Oege SLP LP | | 2026 |
| Oehobby Ltd | Wholesale & retail | 2023 |
| Oemguard LP | | 2012 |
| OES Construction & Energy Ltd | Administrative & support | 2016 |
| OF Edinburgh Ltd | Hospitality | 2022 |
| OF Holding Services LP | | 2017 |
| OF One Mind Ltd | Administrative & support | 2015 |
| Ofalah Edinburgh Veins Limited | Health & social care | 2024 |
| OFF the Beaten Piste Ltd | Administrative & support | 2025 |
| OFF the Rock Design Ltd | Administrative & support | 2015 |
| OFF to Life LP | | 2024 |
| Offbeat Audio Ltd | Information & communication | 2019 |
| Office Contractors Ltd | Information & communication | 2007 |
| Office Papers Limited | Wholesale & retail | 1999 |
| Office Personnel Scotland Ltd. | Professional & scientific | 2003 |
| Office Space Scotland Limited | Information & communication | 2012 |
| Office Suites UK Ltd. | Construction | 1990 |
| Office Support Solutions L.P. | | 2010 |
| Officefones Ltd | Information & communication | 2011 |
| Offset Systems Ltd | Information & communication | 2018 |
| Offshoot Investment LP | | 2016 |
| Offshore Aggregator LP | | 2013 |
| Offshore Design Engineering Consultants Ltd | Professional & scientific | 2017 |
| Offshore Mezzanine Partners II Scotland, L.P. | | 2012 |
| Offshore NDT Ltd | Construction | 2019 |
| Offshore Survey Consult Limited | Mining & quarrying | 2023 |
| Offshore Wind Financial Control Limited | Professional & scientific | 2019 |
| Offshore Wind Project Management Limited | Professional & scientific | 2023 |
| Offshore Wind Safety Solution Ltd | Professional & scientific | 2020 |
| Ofis North Ltd | Manufacturing | 2023 |
| OFS Bidco Limited | Financial services | 2025 |
| OG & MF Limited | Wholesale & retail | 2025 |
| OG Burgers Ltd | Hospitality | 2024 |
| OG Cleaners Ltd | Administrative & support | 2025 |
| OG Electrical Services Limited | Construction | 2025 |
| OG Group LP | | 2016 |
| Ogam Consulting Ltd | Professional & scientific | 2023 |
| Ogan Traders Ltd | Hospitality | 2019 |
| Oganan Bhaile a' Ghobhainn Ltd | Health & social care | 2021 |
| Oganan Dhun Eideann Ltd | Health & social care | 2013 |
| Oganan Ghlaschu Ltd | Professional & scientific | 2015 |
| Ogen Networks LP | | 2015 |
| OGI BIO Ltd | Manufacturing | 2020 |
| Ogilvie and Roberts Accountants Limited | Professional & scientific | 2015 |
| Ogilvie Cabs Limited | Professional & scientific | 2004 |
| Ogilvie Design Ltd | Other services | 2006 |
| Ogilvie Family Properties Limited | Real estate | 2019 |
| Ogilvie Hayes Tree and Garden Services Limited | Administrative & support | 2026 |
| Ogilvie Investments Limited | Extraterritorial | 2016 |
| Ogilvie Stonecraft Limited | Construction | 2023 |
| Ogmw Ltd | Real estate | 2026 |
| OGP Edinburgh Ltd | Hospitality | 2021 |
| Ogston Investment Trading (Scotland) Partnership SP | | 2022 |
| OH Pilates Ltd | Wholesale & retail | 2025 |
| OH3 Ltd | Health & social care | 2011 |
| OHA FD Custom Credit AIV, L.P. | | 2017 |
| OHA Highlands, L.P. | | 2015 |
| Ohana Events Party Planning Limited | Administrative & support | 2025 |
| Ohio (Hair) Limited | Other services | 2019 |
| Ohmo World Ltd | Arts & recreation | 2024 |
| OHO Scotland Limited | Administrative & support | 2017 |
| Ohpromise Wedding Ltd | Professional & scientific | 2018 |
| OI Musica C.I.C. | Education | 2018 |