| Oakdale Residents Limited | Real estate | 1978 |
| Oakdene Developments (Surrey) Ltd | Construction | 2019 |
| Oakdene Landscapes Ltd | Administrative & support | 2019 |
| Oakfield Audio Limited | Information & communication | 2014 |
| Oakfield Court (Horley) RTM Company Limited | Households | 2019 |
| Oakfield Drive Estate Management Limited | Households | 1971 |
| Oakfield Drive Freeholders Limited | Households | 2004 |
| Oakleigh Court (Bookham) Residents Management Company Limited | Households | 2019 |
| Oaks Lane Residents Management Company Limited | Households | 2017 |
| OC Transformation Limited | Manufacturing | 2008 |
| Occam's Remedy APR Limited | Financial services | 2022 |
| Ocean Regenerative Catalytic Action Ltd. | Professional & scientific | 2025 |
| Ocean Squad Ltd | Hospitality | 2024 |
| Ocsko Creations Ltd | Arts & recreation | 2025 |
| Octopus AI Ltd | Information & communication | 2026 |
| ODD Dog Films Limited | Information & communication | 2023 |
| Odin Automotive Ltd | Wholesale & retail | 2022 |
| Odun Campbell Limited | Information & communication | 2025 |
| Off-Field-Sports Ltd | Professional & scientific | 2026 |
| Ogilvie Hall Maintenance Ltd | Households | 2014 |
| OGP Capital Ltd | Financial services | 2017 |
| OGP Environmental Limited | Professional & scientific | 2016 |
| OH Creative Ltd | Professional & scientific | 2014 |
| OH Products Ltd | Wholesale & retail | 2002 |
| OIL Heat Products Ltd | Wholesale & retail | 2013 |
| Okehurst Design & Engineering Limited | Professional & scientific | 2017 |
| Okehurst Properties Limited | Real estate | 2017 |
| Okewood Investments Limited | Households | 1998 |
| Okewood Nursery Limited | Education | 2018 |
| Old Brewery Court Management Company Limited | Households | 2003 |
| Old Bury Hill Block One Limited | Households | 1981 |
| Old Courthouse Dental Practice Limited Partnership | | 2010 |
| Old Sandstone Management Limited | Real estate | 2022 |
| Old School Management Company (Falkland Road) Limited | Households | 2023 |
| Old Stable Lodge Management Company Limited | Hospitality | 2015 |
| Olefant Investments Limited | Hospitality | 2007 |
| Oliver Contractor Services Ltd | Construction | 2023 |
| Omicronalpha Consulting Ltd | Professional & scientific | 2021 |
| Omukisa Limited | Public administration | 2019 |
| ON 101 Limited | Information & communication | 1999 |
| Oncima Limited | Health & social care | 2018 |
| Ondar Fishing Company Limited | Agriculture & fishing | 1981 |
| Onlygeotechnics Limited | Professional & scientific | 2008 |
| Onward Sports Management Ltd | Arts & recreation | 2019 |
| Oplx Ltd | Construction | 2025 |
| Optimal Projects Ltd | Information & communication | 1995 |
| Optimise Global Partners Limited | Professional & scientific | 2015 |
| Orchard Place (Tadworth) Management Limited | Households | 2015 |
| Original Light House Ltd | Wholesale & retail | 2024 |
| Orionation Limited | Professional & scientific | 2003 |
| Oriund Antiques and Coffee Shop Ltd | Wholesale & retail | 2013 |
| OSG Forge Ltd | Manufacturing | 2026 |
| Osprey Sports Group Limited | Financial services | 2025 |
| Ostro RE Limited | Real estate | 2017 |
| Overslea Lodge RTM Company Limited | Households | 2023 |
| Owen Consulting Limited | Professional & scientific | 2017 |
| Owen Loyd Architects LLP | | 2021 |
| Ownlevel Property Management Limited | Hospitality | 2000 |
| Oxford World Learning Ltd | Education | 2010 |
| Ozgun Consultancy Ltd | Wholesale & retail | 2020 |
| P.J.Hartel(Southern)Limited | Professional & scientific | 1949 |
| P2G Contract Support LLP | | 2017 |
| P2G LLP | | 2012 |
| Paddock Close Residents Association Limited | Households | 1987 |
| Paint Express Ltd | Construction | 2025 |
| PAN United Ltd | Wholesale & retail | 1979 |
| Pansector Consulting Limited | Professional & scientific | 2012 |
| Papworth Investments Ltd | Information & communication | 2011 |
| Paradigm Stairs Ltd | Construction | 2022 |
| Paramount Eagles Group Ltd | Construction | 2022 |
| Parish Leisure Ltd | Wholesale & retail | 2020 |
| Park Farm Ockley Limited | Agriculture & fishing | 2024 |
| Park Gate (Knaphill) Residents Company Limited | Households | 1995 |
| Parkgate Construction Capel Limited | Construction | 2012 |
| Parkside Gardens Residents Company Limited | Households | 2001 |
| Parkview Court (Redhill) Management Company Limited | Households | 2008 |
| Partridge Lane Limited | Extraterritorial | 2004 |
| Party Bits & Bobs Limited | Wholesale & retail | 1987 |
| PAS Financial and Mortgage Solutions Limited | Financial services | 2004 |
| Pathways Freeholders Limited | Households | 2012 |
| Patrell Investments (Croydon) Limited | Real estate | 2025 |
| Patrell Investments (Grosvenor House) Limited | Real estate | 2025 |
| Patrell Investments Limited | Construction | 2024 |
| Patt and Harris Ltd | Information & communication | 2025 |
| Patty Plus Services Ltd | Administrative & support | 2019 |
| Paul Davids Arboricultural Consultancy Ltd | Professional & scientific | 2024 |
| Paul Hunt Developments (Devon) Limited | Construction | 2009 |
| Paul Hunt Developments Limited | Construction | 1999 |
| Paul Hunt Homes Limited | Construction | 1990 |
| Paul Hunt Investments (Banstead) Limited | Financial services | 2012 |
| Paul Hunt Investments Limited | Construction | 1994 |
| Paxton Wolf Limited | Professional & scientific | 2022 |
| Payment Kiosks Limited | Information & communication | 2019 |
| Payment Solutions Global Limited | Professional & scientific | 2015 |
| PB Talent Ltd | Professional & scientific | 2022 |
| PDJ Advisory Ltd | Real estate | 2023 |
| PEA PEA Sea Limited | Professional & scientific | 2019 |
| Peaches Digital Ltd | Professional & scientific | 2022 |
| Peachymai Productions Ltd | Professional & scientific | 2021 |
| Pebble Hotels Limited | Hospitality | 2006 |