| Odfjell Technology Ltd | | 2021 |
| Odfjell Well Services II Ltd. | | 2018 |
| OG Park Limited | Construction | 2024 |
| Ohana Hughes Property Group Ltd | Real estate | 2023 |
| Ohanlon Rentals Limited | Real estate | 2026 |
| OIL Companies International Marine Forum | | 1977 |
| Oilserver Limited | Wholesale & retail | 1997 |
| Okpablo Limited | Professional & scientific | 2018 |
| Oleums Gray Ltd | Health & social care | 2023 |
| Oliarch Ltd | Health & social care | 2026 |
| Oliver Integrated Ltd. | Construction | 2005 |
| Ollybear Hamilton Ltd | Wholesale & retail | 2019 |
| Ollybear Online Ltd | Wholesale & retail | 2019 |
| ON Site Contracts Group Ltd | Construction | 2022 |
| Onaway Ltd | Other services | 2025 |
| One Star Leisure Limited | Hospitality | 2016 |
| One Stop Mortgage Shop Limited | Financial services | 2015 |
| Oneten Trading Ltd | Wholesale & retail | 2026 |
| Online Tech Deals Ltd | Wholesale & retail | 2026 |
| Onpoint Advisory Limited | Professional & scientific | 2025 |
| Onyx Property Partners Ltd | Real estate | 2025 |
| Open Fitness East Kilbride Ltd | Arts & recreation | 2016 |
| Opticall Scotland Limited | Health & social care | 2016 |
| Opulent Estates Ltd | Real estate | 2017 |
| ORB Property Planning Ltd | Construction | 2017 |
| Orbis Managing Partner (Europe) Limited | | 2009 |
| Orbitbuy Ltd | Wholesale & retail | 2026 |
| Orchitech Limited | Information & communication | 2026 |
| Order Zone Ltd | Wholesale & retail | 2021 |
| Oreo & Ghost Ltd | Hospitality | 2024 |
| Origin Parts Solutions Limited | Wholesale & retail | 2011 |
| Origin RPM Limited | Administrative & support | 2011 |
| ORR Property Experts Ltd | Real estate | 2024 |
| Orthodox Consultants Limited | Administrative & support | 2023 |
| Oruam Restaurant Limited | Hospitality | 2025 |
| Orzato Limited | Hospitality | 2024 |
| Osahon Limited | Transport & logistics | 2019 |
| OSD Design Solutions Limited | Professional & scientific | 2012 |
| Osprey Management Limited | Financial services | 2018 |
| OUR Fashion Ltd | Manufacturing | 2018 |
| OUR Time Productions Limited | Arts & recreation | 2025 |
| Outlet:Play Resource | Education | 2016 |
| Outstanding Drainage Ltd | Construction | 2025 |
| Overhall Limited | | 2023 |
| Overture Managed Solutions Ltd | Professional & scientific | 2017 |
| OZ Machine UK Limited | Wholesale & retail | 2024 |
| P & D Estates Leicester Ltd | Real estate | 2021 |
| P Boland Services Ltd | Manufacturing | 2025 |
| P J Milligan Limited | Wholesale & retail | 2003 |
| P J Private Care Ltd | Health & social care | 2023 |
| P Kanabar Private Ltd | Health & social care | 2020 |
| P Mckernan Holdings Ltd | Financial services | 2020 |
| P Mckernan Investment Ltd | Construction | 2020 |
| P Tech Service (Centre) Ltd | Wholesale & retail | 2011 |
| P&As Investments Ltd | Financial services | 2024 |
| P&M Anderson Contracts Limited | Construction | 2011 |
| P. Mckernan Construction Limited | Construction | 1999 |
| P.A.P Construction Service Ltd | Construction | 2013 |
| P.V.M. OIL Associates Limited | | 1979 |
| Pacific Life RE International Limited | | 2020 |
| Packer Signbox Centre Ltd | Manufacturing | 2009 |
| Padel Fit Limited | Arts & recreation | 2024 |
| Page Mamaco Ltd | Professional & scientific | 2017 |
| Painter Engineering Limited | Manufacturing | 1998 |
| Paisley Freight Ltd | Professional & scientific | 2015 |
| Palace Entertainment Group Ltd | Hospitality | 2026 |
| Palapa Ltd | Real estate | 2021 |
| Palletworx Limited | Transport & logistics | 2024 |
| Pandher Property Ltd | Real estate | 2024 |
| Panov Logistics Ltd | Transport & logistics | 2023 |
| Panton Plastering Ltd | Construction | 2023 |
| Pantor Ltd | Financial services | 2021 |
| Papaval Retail Limited | Wholesale & retail | 2021 |
| Papers Plus Limited | Wholesale & retail | 2017 |
| Parallax Healthcare Ltd | Administrative & support | 2025 |
| Paramount Creative Ltd | Real estate | 2018 |
| Paramount Design Scot Ltd | Manufacturing | 2018 |
| Paramount Events Ltd | Administrative & support | 2018 |
| Parent Action for Safe Play | Health & social care | 2011 |
| Paresh Properties Ltd | Real estate | 2017 |
| Parfait Flooring Ltd | Construction | 2024 |
| Pargas Logistics Ltd | Transport & logistics | 2020 |
| Park Avenue Investments Limited | | 2023 |
| Park Construction & Plant Hire Ltd | Construction | 2010 |
| Park's (AYR) Limited | Wholesale & retail | 1991 |
| Park's (Property Management Services) Limited | Real estate | 2012 |
| Park's of Hamilton (Holdings) Limited | Professional & scientific | 1978 |
| Park's of Hamilton (Investments) Limited | Professional & scientific | 2024 |
| Park's of Hamilton (Properties) Limited | Real estate | 2024 |
| Park's of Hamilton (Townhead Garage) Limited | Wholesale & retail | 1977 |
| Parkburn Precision Handling Systems Employee Ownership Trustees Limited | Administrative & support | 2022 |
| Parkburn Precision Handling Systems Limited | Manufacturing | 1995 |
| Parker Plastering (Scotland) Ltd | Construction | 2026 |
| Parklane Property Improvements Ltd | Construction | 2023 |
| Parklane Property Specialists Ltd | Professional & scientific | 2021 |
| Parks of Hamilton (Coach Hirers) Limited | Transport & logistics | 1979 |
| Parks of Hamilton Limited | Wholesale & retail | 1987 |
| Partha Ltd | Health & social care | 2023 |
| Parthas Property Ltd | Real estate | 2025 |
| Partners FC II Ltd | | 2023 |