| Oban Hospice Limited | Health & social care | 1999 |
| Oban Lettings Limited | Real estate | 2021 |
| Oban Lorne RFC Ltd | Arts & recreation | 2003 |
| Oban Marina & Yacht Services Limited | Wholesale & retail | 2012 |
| Oban Milk Supplies Limited | Wholesale & retail | 2007 |
| Oban Mortgage Services Ltd | Financial services | 2017 |
| Oban Motor Home Hire Ltd | Administrative & support | 2026 |
| Oban Physiotherapy Ltd | Health & social care | 2019 |
| Oban Plumbing & Heating Limited | Construction | 2015 |
| Oban Port Users Limited | Agriculture & fishing | 1991 |
| Oban Property Co Limited | Real estate | 2026 |
| Oban Quality Laundry & DRY Cleaners Limited | Other services | 2026 |
| Oban Sandwich Ltd | Hospitality | 2024 |
| Oban Seafood Company Limited | Wholesale & retail | 2023 |
| Oban Self Catering Limited | Hospitality | 2024 |
| Oban Skip Hire Ltd. | Water & waste | 2004 |
| Oban Soap Company Limited | Manufacturing | 2024 |
| Oban Storage Limited | Other services | 2024 |
| Oban Taxis Ltd | Transport & logistics | 2025 |
| Oban Timber Frame Limited | Construction | 2018 |
| Oban WAR and Peace Museum | Arts & recreation | 2003 |
| Oban Yacht Charters Ltd | Transport & logistics | 2022 |
| Obanstores Ltd | Wholesale & retail | 2024 |
| Ocean Explorer Centre Limited | Other services | 2013 |
| Ocean Hunter Limited | Agriculture & fishing | 2013 |
| OD Smiles Limited | Health & social care | 2023 |
| ODD FOX Productions Limited | Information & communication | 2023 |
| OF the Wild Productions Ltd | Information & communication | 2022 |
| Offshore Shellfish Limited | Agriculture & fishing | 2006 |
| OGH Management Ltd | Hospitality | 2026 |
| Old Pines Scotland Ltd. | Hospitality | 2004 |
| Ooshka Bar Limited | Arts & recreation | 2023 |
| Oran Property Ltd | Real estate | 2022 |
| Orasaigh Ltd | Wholesale & retail | 2019 |
| Osricks.Scot. Ltd | Real estate | 2026 |
| OUT Skerries Fiskr Ltd | Agriculture & fishing | 2018 |
| Outfit of Tomorrow Ltd | Wholesale & retail | 2021 |
| P Gillespie & SON Stonework Limited | Construction | 2021 |
| P&L Asset Ltd | Real estate | 2023 |
| Pagekey Publishing Limited | Information & communication | 2024 |
| Pailteas Ltd | Hospitality | 2025 |
| PAK Hub Ltd | Hospitality | 2026 |
| Paperflute Ltd | Manufacturing | 2021 |
| Pashép Ltd | Other services | 2025 |
| Passing Place (Oban) Ltd | Wholesale & retail | 2026 |
| Paterson Shellfish Ltd | Agriculture & fishing | 2011 |
| Patogen Limited | Professional & scientific | 2018 |
| Patterdale Property Limited | Construction | 2017 |
| PB Properties (Oban) Limited | Real estate | 2021 |
| PDK Shellfish Limited | Wholesale & retail | 2006 |
| Pearl Caters Ltd | Hospitality | 2019 |
| PGS Japanese Knotweed Solutions Limited | Administrative & support | 2025 |
| Pilkington Technology Management Limited | Manufacturing | 1963 |
| PIT Stop Tyres (Fort William) Ltd | Wholesale & retail | 2026 |
| Pjme Consultants Limited | Professional & scientific | 2022 |
| Plant Hire Plus Ltd | Administrative & support | 2026 |
| Platenation Ltd | Wholesale & retail | 2025 |
| POD Subsea Contractors Limited | Professional & scientific | 2020 |
| Port Ellen Harbour Association Limited | Other services | 2001 |
| Portsonachan Hydro Ltd. | Energy | 2012 |
| Posh Paws Helensburgh Limited | Wholesale & retail | 2012 |
| Power Technics Ltd | Information & communication | 2024 |
| Precision Subsea Electronics Limited | Manufacturing | 2009 |
| Print Mhor Limited | Manufacturing | 2022 |
| Pristine Argyll Ltd | Administrative & support | 2019 |
| Puffer Steamboat Holidays Limited | Administrative & support | 2005 |
| Pure Clean Oban Ltd | Administrative & support | 2025 |
| PV Properties Oban Limited | Real estate | 2022 |
| Quintun Limited | Real estate | 1992 |
| R a Clement Associates LLP | | 2020 |
| R Livingstone Plant Ltd | Agriculture & fishing | 2019 |
| R Muir Ltd | Manufacturing | 2025 |
| R&R Properties (Oban) Limited | Real estate | 2026 |
| R75 Projects Limited | Real estate | 2023 |
| Rafiki's Club Ltd | Health & social care | 2025 |
| Ravenswood House Limited | Hospitality | 2020 |
| Ravenswood Properties (Lochaber) Limited | Hospitality | 2026 |
| RECYCLE-2-GETHER Ltd | Wholesale & retail | 2007 |
| Reflex Lifting Systems Limited | Manufacturing | 1995 |
| Reforest Scotland Ltd | Agriculture & fishing | 2024 |
| Rekar Trade Ltd | Other services | 2025 |
| Renewable Energy and Performance Ltd | Administrative & support | 2026 |
| Retain Automotive Ltd | Professional & scientific | 2017 |
| Reterp Limited | Extraterritorial | 2010 |
| Rhet Argyll and Bute Limited | Education | 2022 |
| Ricada Properties HC Limited | Financial services | 2025 |
| Ricada Properties Limited | Real estate | 2025 |
| Ridge Reach Networks Ltd | Information & communication | 2026 |
| Riochan Ltd | Real estate | 2021 |
| Rioga Offshore Ltd | Professional & scientific | 2014 |
| RKC Marine Services Limited | Transport & logistics | 2025 |
| Rktecture Limited | Professional & scientific | 2021 |
| RM Renewables Limited | Construction | 2025 |
| Rndo Supply Ltd | Wholesale & retail | 2025 |
| Rocks Fine Foods Limited | Wholesale & retail | 2025 |
| Room at the Top - Kilmelford Ltd | Hospitality | 2019 |
| Rose Villa Oban Limited | Hospitality | 2026 |
| Rossco Highland Limited | Construction | 2021 |
| Roton Ltd | Hospitality | 2022 |
| S E Carmichael Limited | Construction | 2005 |