| Northern Fibre Solutions Ltd | Information & communication | 2024 |
| Northern High Voltage Connections Ltd | Professional & scientific | 2026 |
| Northgate Steakhouse Limited | Hospitality | 2026 |
| Northumberland Court (2008) Limited | Households | 2008 |
| Nostalgia Lights Limited | Wholesale & retail | 2018 |
| Novasync Tsunami Systems Ltd | Information & communication | 2026 |
| Nove International Limited | Professional & scientific | 2025 |
| November Kilo Productions Limited | Information & communication | 2014 |
| NR Global Logistics Ltd | Transport & logistics | 2021 |
| Nuhaus Developments Ltd | Construction | 2025 |
| Nurtured Vitality Ltd | Information & communication | 2025 |
| Nutbasket Foods Limited | Manufacturing | 2025 |
| Nutra Mitra Ltd | Wholesale & retail | 2025 |
| NWD Properties Limited | Real estate | 2025 |
| O Aluminium Limited | Manufacturing | 2017 |
| O'Sullivan Estates Ltd | Real estate | 2023 |
| Oakfield Court Management Limited | Households | 1996 |
| OAL (UK) Limited | Other services | 2004 |
| Occulture Studio Ltd | Arts & recreation | 2026 |
| Ocean Signal Limited | Manufacturing | 2008 |
| Ocean Stefan Company Ltd | Arts & recreation | 2026 |
| Ocean's 37 Ltd | Other services | 2018 |
| OCT Luxury Transfers Ltd | Transport & logistics | 2025 |
| Octo Arts Limited | Information & communication | 2024 |
| OE Maritime High-Voltage Ltd | Construction | 2025 |
| OFF the Hook Productions and Events Limited | Arts & recreation | 2012 |
| Offshore Green Energy Ltd | Construction | 2021 |
| OG Property&Services Ltd | Hospitality | 2024 |
| OH My GOD! It’S the Church Ltd | Arts & recreation | 2018 |
| Ohana Care Homes Ltd | Health & social care | 2021 |
| OHS Essential Limited | Wholesale & retail | 2026 |
| OJS Electrical Services Ltd | Construction | 2025 |
| Oladez Ltd | Information & communication | 2022 |
| Olby's Creative Hub Ltd | Arts & recreation | 2018 |
| Old Cafe of Ramsgate Ltd | Hospitality | 2012 |
| Old City Carpentry and Construction Ltd. | Construction | 2019 |
| Old Town Developments (Kent) Ltd | Construction | 2021 |
| Old Town Property Services Ltd | Households | 2021 |
| Olimpia Bakery Ltd | Hospitality | 2022 |
| Omar Records Studio Ltd | Information & communication | 2025 |
| Omega Windows and Conservatories (Southern) Limited | Administrative & support | 1997 |
| Omnicare Health Limited | Health & social care | 2013 |
| ON a Whim Margate Limited | Wholesale & retail | 2024 |
| ON TAP Building Services Ltd | Construction | 2012 |
| One Trading Limited | Wholesale & retail | 2022 |
| Oneillrail Ltd | Other services | 2017 |
| Onoco Consultancy Limited | Professional & scientific | 2026 |
| Onoco Properties Ltd | Real estate | 2022 |
| Onsite Retail Management Limited | Wholesale & retail | 2018 |
| Open School East | Education | 2013 |
| OPM Property Limited | Real estate | 2020 |
| Orange Property (Margate) Limited | Households | 2020 |
| Orasise Limited | Health & social care | 2015 |
| ORBIX360 Communication Limited | Construction | 2025 |
| Orchard Court (Lynsted) Ltd | Households | 2015 |
| Orchard Engineering (Broadstairs) Limited | Construction | 1997 |
| Original Design House Ltd | Professional & scientific | 2015 |
| Osim Property Ltd | Construction | 2022 |
| Ouma's Margate Ltd | Wholesale & retail | 2018 |
| Ournarrowboat Ltd | Transport & logistics | 2014 |
| Outlast Management & Maintenance Ltd | Construction | 2023 |
| Outlast Properties Ltd | Real estate | 2023 |
| Oval Trade Management Ltd | Professional & scientific | 2018 |
| Overseas Accommodation London Limited | Administrative & support | 2003 |
| Oyster Management Ltd | Real estate | 2026 |
| P K M Consultancy Services Limited | Professional & scientific | 2001 |
| P K R Services Limited | Construction | 2004 |
| P.A. Rimmer Construction Limited | Wholesale & retail | 1990 |
| P.Image Ltd | Information & communication | 2018 |
| P.M. Ellcock & SON Ltd. | Energy | 2012 |
| PA Digital Media Ltd | Information & communication | 2025 |
| PA Vision Limited | Manufacturing | 2011 |
| Paddle Media CIC | Education | 2024 |
| Pagedales Limited | Real estate | 1993 |
| PAH HAH Limited | Real estate | 2018 |
| Pallas Services Limited | Information & communication | 2021 |
| Palm & Yarn Ltd | Arts & recreation | 2015 |
| Palm Bay Digital Ltd | Professional & scientific | 2024 |
| Palm Bay Hand Car Wash Ltd | Wholesale & retail | 2026 |
| Palm Bay MOT Service Centre Ltd | Manufacturing | 2013 |
| Palm Deaf BSL Training Limited | Education | 2015 |
| Palm Realty Limited | Real estate | 2022 |
| Palmbay MAN and Van Ltd | Transport & logistics | 2020 |
| Palmbayautomotive Ltd | Wholesale & retail | 2024 |
| Palme Property Solutions Limited | Construction | 2025 |
| Palms Landscaping Ltd | Administrative & support | 2024 |
| Palms Pizza Ltd | Hospitality | 2022 |
| PAN Africa Agric Finance & Communications Ltd | Agriculture & fishing | 2025 |
| Panchal's Corner Ltd | Wholesale & retail | 2026 |
| Panda Chen Ltd | Hospitality | 2025 |
| Panda New 2026 Ltd | Hospitality | 2026 |
| Panther Estates 2026 Ltd | Real estate | 2025 |
| Paper Straw People Limited | Other services | 2019 |
| Papillon Interiors LLP | | 2011 |
| PAR Sound Ltd | Information & communication | 2024 |
| Paragon Painting Ltd | Construction | 2025 |
| Parkers Transmissions Ltd | Wholesale & retail | 2026 |
| Parkin & Lane Estates Ltd | Real estate | 2025 |
| Parkin Motors Ltd | Wholesale & retail | 2024 |
| Parkin Real Estate Ltd | Real estate | 2025 |