| Personal Images Limited | Manufacturing | 1989 |
| Pete Dolan Development Ltd | Construction | 2015 |
| Phgm Ltd | Real estate | 2022 |
| Phillips Profile Limited | Administrative & support | 2002 |
| Piers Hickin Holdings Limited | Financial services | 2026 |
| Pipefreezing and Hot Tapping Ltd. | Construction | 1996 |
| Piquant Design Limited | Information & communication | 2007 |
| Plextek Campus Limited | Professional & scientific | 2020 |
| Poly Textiles Limited | Administrative & support | 2015 |
| Poultry Farming Ltd | Agriculture & fishing | 2022 |
| PPF -Variopool Ltd | Other services | 2022 |
| Precision Carpentry & Joinery Limited | Extraterritorial | 2024 |
| Precision Woodwork Limited | Manufacturing | 2012 |
| Pretloves Removal & Storage Service Ltd | Transport & logistics | 2009 |
| Prompt Glazing Ltd | Construction | 2004 |
| Propotec Ltd | Construction | 1970 |
| Provala Ltd | Information & communication | 2020 |
| Purple Connections Ltd | Other services | 2014 |
| Putterill's of Hertfordshire (Hitchin) Limited | Real estate | 2002 |
| Putterill's of Hertfordshire (Knebworth) Limited | Real estate | 2002 |
| Putterill's of Hertfordshire (Welwyn Garden City) Limited | Real estate | 2002 |
| Putterill's of Hertfordshire Limited | Real estate | 1998 |
| Putterills Holdings Limited | Financial services | 2023 |
| Putterills Lettings Limited | Real estate | 2018 |
| Putterills of Hertfordshire (Stevenage) Ltd | Real estate | 2003 |
| Pyramid Fire Limited | Public administration | 2012 |
| Quiet Oak Limited | Information & communication | 2020 |
| Quinn Analytical Ltd | Health & social care | 2022 |
| Quoin Limited | Construction | 2000 |
| R. M. Chancellor & Company Limited | Professional & scientific | 1996 |
| Rala Aviation Limited | Other services | 2005 |
| Randleford Ltd | Hospitality | 2004 |
| Rathnee Investments Limited | Real estate | 2022 |
| Rayner Carter Properties Limited | Real estate | 2023 |
| Real View Foods Limited | Manufacturing | 2020 |
| Rebana Investments Ltd | Financial services | 2023 |
| Redtail Telematics Limited | Professional & scientific | 2010 |
| Responsible Reliable Recruitment Ltd | Administrative & support | 1999 |
| Retail Sales Link Ltd | Extraterritorial | 2014 |
| Richard Briers Limited | Administrative & support | 2017 |
| Richard Heath (IP) Associates Limited | Professional & scientific | 2010 |
| Rising Spires Limited | Real estate | 2025 |
| RJ Bags Limited | Wholesale & retail | 2020 |
| Rlxpartners Limited | Financial services | 2023 |
| ROD Richards Investments Ltd | Financial services | 2024 |
| Rolph Services Limited | Professional & scientific | 2012 |
| Romarly Ltd | Extraterritorial | 2007 |
| Roofing Network Ltd | Construction | 2025 |
| Room 29 Limited | Transport & logistics | 2014 |
| Roxo Group UK Ltd | Wholesale & retail | 2015 |
| Royston Scaffolding Limited | Construction | 2018 |
| RS Structural Consultants Limited | Extraterritorial | 2024 |
| S.E.A.S.S. Ltd | Administrative & support | 2004 |
| SAFE4SITE Limited | Professional & scientific | 2009 |
| Saffron Apparel Ltd | Wholesale & retail | 2009 |
| Saffron Construction Limited | Extraterritorial | 2020 |
| Saffron Pawtique Limited | Extraterritorial | 2020 |
| Sandall Road Estates Limited | Real estate | 2019 |
| Saphire Computers Limited | Information & communication | 1996 |
| SCN Structured Finance Limited | Financial services | 2018 |
| Sector Communications Ltd | Information & communication | 2025 |
| Selves Plumbing and Heating Ltd | Construction | 2024 |
| Semper Nova Property Limited | Real estate | 2022 |
| Settle Down Ltd | Real estate | 2020 |
| Shackleton Enterprises Ltd | Manufacturing | 2012 |
| Shardin Ltd | Professional & scientific | 2025 |
| Shavemead Limited | Construction | 1979 |
| Shire Hill Management Company Limited | Real estate | 2007 |
| Showcase Research Limited | Professional & scientific | 2011 |
| Signal Marketing Limited | Professional & scientific | 2008 |
| Silverjump Ltd | Professional & scientific | 2003 |
| SIX Days Limited | Professional & scientific | 2002 |
| SIX Sixty Services Limited | Wholesale & retail | 2021 |
| SKI Chums Ltd | Information & communication | 2022 |
| SP Agri Consulting Ltd | Professional & scientific | 2025 |
| Spearwell Engineering Ltd | Construction | 2004 |
| Spine-Issimus Limited | Agriculture & fishing | 1992 |
| Squalino Restaurants Ltd | Hospitality | 2024 |
| Stapleford Property Holding Company Limited | Households | 2007 |
| Stephen and Lucie Gallagher Property Limited | Real estate | 2018 |
| Stoat Research Limited | Professional & scientific | 2019 |
| Strategic Insurance Communications Ltd | Professional & scientific | 2024 |
| Structure Workshop Limited | Professional & scientific | 2004 |
| Studio Perring Ltd | Extraterritorial | 2019 |
| Suffolk Motors (Newmarket) Limited | Administrative & support | 1998 |
| Supercar Protect Limited | Wholesale & retail | 2026 |
| Sustain Building Management Services Ltd | Other services | 2014 |
| Tactical Research Ltd | Professional & scientific | 2016 |
| Tetelestai Advisory & Consulting Services Ltd | Professional & scientific | 2023 |
| That's SEW Terry FOX! Ltd | Education | 2022 |
| THE Brighter Planning Consultancy Limited | Professional & scientific | 2018 |
| THE Cambridge Wine Academy Limited | Education | 2015 |
| THE Chesterfords Community Preschool | Education | 2010 |
| THE Comedy Store (Manchester) Limited | Extraterritorial | 1999 |
| THE Comedy Store Holdings Limited | Financial services | 2025 |
| THE Elec Group Limited | Other services | 2019 |
| THE Joint Neurosciences Council | Health & social care | 2016 |
| THE Loaf TIN Bakery Limited | Manufacturing | 2024 |
| THE Marshgate Group Limited | Real estate | 2019 |
| THE Proactive PA Ltd | Administrative & support | 2019 |