| OM Restaurant Ltd | Hospitality | 2022 |
| OM Retrofit Ltd | Wholesale & retail | 2014 |
| OM Sweet and Savouries Ltd | Wholesale & retail | 2022 |
| Omina Ltd | Wholesale & retail | 2025 |
| Omshanti Ltd | Hospitality | 2025 |
| One Stop Repair Ltd | Wholesale & retail | 2025 |
| ONE2ONEWITHMAKINGWAVES Ltd | Education | 2025 |
| Online TJ Trading Ltd | Wholesale & retail | 2020 |
| Onus Technologies Limited | Extraterritorial | 2008 |
| OOO Divine Ltd | Wholesale & retail | 2014 |
| Ooomeringues Limited | Extraterritorial | 2015 |
| Opale Ltd | Professional & scientific | 1996 |
| Open & Informed (OAI) Ltd | Wholesale & retail | 2024 |
| Optimum Plastering Ltd | Construction | 2022 |
| Optimum Rides Limited | Transport & logistics | 2024 |
| Orange EYE Limited | Administrative & support | 2009 |
| Oriental Dragon Limited | Hospitality | 2010 |
| Original Party BOY Limited | Wholesale & retail | 2025 |
| OSK Limited | Real estate | 2021 |
| Oskal Imperiolizma Ltd | Extraterritorial | 2006 |
| Otie Events Ltd | Arts & recreation | 2024 |
| Outlier Creative Ltd | Professional & scientific | 2025 |
| Own Solutions Ltd | Information & communication | 2016 |
| Ozcraft Limited | Agriculture & fishing | 2010 |
| Ozone AMD Limited | Hospitality | 2018 |
| P & R Benham Limited | Administrative & support | 2017 |
| P & Sons Investment Ltd | Real estate | 2024 |
| P G Brown Contractors Limited | Construction | 2012 |
| P J & Sons Services Limited | Water & waste | 2023 |
| P J Grab Hire Ltd | Construction | 2022 |
| P J Recycling Limited | Water & waste | 2010 |
| P. M. White DRY Lining Limited | Construction | 2004 |
| P. M. White Property Holdings Limited | Administrative & support | 2004 |
| P. P. K. Services Limited | Manufacturing | 1999 |
| P.H. Builders Limited | Construction | 1987 |
| P.O.D. Global Logistics Limited | Transport & logistics | 2015 |
| Padmashree Jewellers Ltd | Wholesale & retail | 2016 |
| Pagessa Ltd | Information & communication | 2024 |
| Palais House Limited | Real estate | 2017 |
| Panache Global Entertainment Limited | Arts & recreation | 2013 |
| Panda Natural Health Ltd | Other services | 2023 |
| PANS1172 Ltd | Health & social care | 2025 |
| Paperwork Solutions Limited | Professional & scientific | 2006 |
| Paradiso Property Maintenance Ltd | Administrative & support | 2024 |
| Parentplayer Ltd | Education | 2024 |
| Park Home News LLP | | 2016 |
| Park to Player Ltd | Arts & recreation | 2023 |
| Parnellhogans Ltd | Wholesale & retail | 2025 |
| Parth Software Limited | Information & communication | 2022 |
| Pasifika Art Creation & Events Ltd | Wholesale & retail | 2021 |
| Pasupati Limited | Hospitality | 2024 |
| Pasupati Stores Ltd | Wholesale & retail | 2018 |
| Pathibhara Limited | Wholesale & retail | 2015 |
| Pathibhara Tailors Ltd | Administrative & support | 2017 |
| Patrick Hollwey Limited | Professional & scientific | 2012 |
| Patsons Enterprise Ltd | Real estate | 2026 |
| Paula Hawkins Limited | Information & communication | 2013 |
| Pavin Consultancy Ltd | Other services | 2019 |
| Pawreg Limited | Hospitality | 2020 |
| Paws of Nature Ltd | Manufacturing | 2024 |
| PB Medical & Communications Services Limited | Health & social care | 2025 |
| PCM Decorating Services Ltd | Construction | 2008 |
| PDL PUB Co Ltd | Hospitality | 2026 |
| PDM Southern Limited | Other services | 2010 |
| PDU Choice Ltd | Extraterritorial | 2013 |
| Peachy Digital Media Ltd | Information & communication | 2023 |
| Peacock Aviation Ltd | Manufacturing | 2024 |
| Pearl Global Collection Ltd | Hospitality | 2020 |
| Pearl Representation Ltd | Administrative & support | 2014 |
| Pedras Trading Company Limited | Administrative & support | 1994 |
| Peepal Estate Agents Limited | Real estate | 2017 |
| Peepal Mortgages Limited | Professional & scientific | 2016 |
| Peer Consultancy Ltd | Other services | 2021 |
| Pegasus Court (Aldershot) Limited | Households | 2003 |
| Pegasus Imaging Limited | Professional & scientific | 2001 |
| Peggy Findji Limited | Professional & scientific | 2014 |
| Penny DE Valk Growth Advisor Limited | Professional & scientific | 2017 |
| Pens Limited | Professional & scientific | 2001 |
| People Analytics Works Ltd | Extraterritorial | 2020 |
| People Poster Production Limited | Professional & scientific | 2025 |
| Peopleplus Training and Coaching Limited | Education | 2018 |
| Pepe Parking Ltd | Real estate | 2025 |
| Peppa Properties Ltd | Real estate | 2026 |
| Peregrine Housing Ltd | Real estate | 2026 |
| Peregrine Security Ltd | Administrative & support | 2025 |
| Perfect Fashion Design N Alterations Ltd | Wholesale & retail | 2026 |
| Perfect Foods Ltd | Wholesale & retail | 2025 |
| Performance Driven Digital Ltd | Professional & scientific | 2026 |
| Performance Vehicles Limited | Extraterritorial | 2018 |
| Perio Training Ltd | Education | 2025 |
| Perk Invest Ltd | Real estate | 2024 |
| Perkelt Limited | Information & communication | 2016 |
| Perktransfers Ltd | Transport & logistics | 2023 |
| Perlua Aesthetics & Wellbeing Ltd | Health & social care | 2025 |
| Petal Haus Flowers Ltd | Wholesale & retail | 2026 |
| Pete's Engineering Ltd | Manufacturing | 2015 |
| PG Maintenance Services Ltd | Construction | 2026 |
| PG Village Garage Limited | Wholesale & retail | 2013 |
| PH Enterprises Ltd | Manufacturing | 2026 |
| Pharma a Ltd | Health & social care | 2017 |