| 3PCE Ltd | Education | 2022 |
| 3PM Ventures Ltd | Hospitality | 2017 |
| 3RADICAL Limited | Information & communication | 2011 |
| 3RD Light Europe Limited | Wholesale & retail | 2018 |
| 3RD Light Holdings Limited | Financial services | 2018 |
| 3RD Light Limited | Manufacturing | 2004 |
| 3RD Vision Business Consultancy UK Ltd | Professional & scientific | 2019 |
| 3SC Services Limited | Information & communication | 2020 |
| 3SE Properties Limited | Real estate | 2019 |
| 3SHAPE UK Limited | Manufacturing | 2021 |
| 3T Properties Limited | Construction | 2000 |
| 3TAILS Ltd | Hospitality | 2025 |
| 3UK Retail Limited | Extraterritorial | 2006 |
| 4 Kings Consultancy Limited | Professional & scientific | 2010 |
| 4 Kings Property & Lettings Ltd | Real estate | 2021 |
| 4 Osbert House Limited | Households | 2007 |
| 4 Park Street Limited | Real estate | 2018 |
| 4 Phone FIX Ltd | Wholesale & retail | 2022 |
| 4 Promo Limited | Administrative & support | 2015 |
| 4 Prospect Mews Limited | Households | 2020 |
| 4 School Road Tilehurst Management Company Limited | Households | 1997 |
| 4 Seasons Outdoor U.K. Ltd | Wholesale & retail | 2012 |
| 40 Carey Street Ltd | Households | 2023 |
| 404 Gaming Ltd | Information & communication | 2024 |
| 40:40 Link (East) Management Company Limited | Households | 2019 |
| 40:40 Link (West) Management Company Limited | Households | 2019 |
| 41 Eaton Road Residents Company Limited | Households | 2002 |
| 41PG Limited | Real estate | 2019 |
| 420 Limited | Information & communication | 1995 |
| 42SHARP Ltd | Administrative & support | 2014 |
| 42SRPROPERTIES Ltd | Households | 2020 |
| 42STATIONROAD Ltd | Households | 2019 |
| 435 Properties Ltd | Real estate | 2025 |
| 45-51 (ODD) Springfield Park (Freehold) Limited | Households | 2018 |
| 466 Consulting Limited | Information & communication | 2019 |
| 47 Pavilion Road Limited | Households | 2007 |
| 49 Norfolk Crescent Freeholders Ltd | Hospitality | 2011 |
| 49TH Floor Consulting Limited | Administrative & support | 2017 |
| 4BREEZE Ltd | Information & communication | 2023 |
| 4BY4 Limited | Professional & scientific | 2024 |
| 4COM Capital Limited | Information & communication | 2008 |
| 4COM Group Limited | Information & communication | 2017 |
| 4COM Network Services Limited | Information & communication | 2008 |
| 4COM Technologies Limited | Information & communication | 2008 |
| 4D Heating & Plumbing Ltd | Construction | 2013 |
| 4D Productions Ltd | Arts & recreation | 2025 |
| 4H2D Ltd | Professional & scientific | 2021 |
| 4KPN Limited | Wholesale & retail | 2016 |
| 4L Engineering Limited | Administrative & support | 2013 |
| 4OCEANS Property Limited | Real estate | 2024 |
| 4RT Limited | Information & communication | 2007 |
| 4S UK Consulting Limited | Information & communication | 2018 |
| 4SG Properties Limited | Real estate | 2021 |
| 4SQUARE Recruitment Ltd | Administrative & support | 2023 |
| 4X4MATT Ltd | Wholesale & retail | 2011 |
| 5 Element Marketing Limited | Administrative & support | 2016 |
| 5 Lion Ltd | Administrative & support | 2026 |
| 5 Natures Movies International Limited | Information & communication | 2021 |
| 5 Priory Avenue Limited | Real estate | 1997 |
| 5 River Terrace Management Company Limited | Households | 2006 |
| 5 Star Alloys Ltd | Wholesale & retail | 2026 |
| 5 Toynbee Close Ltd | Construction | 2018 |
| 5-11 Nelson Mews Freehold Company Limited | Households | 2025 |
| 500 Cars Limited | Transport & logistics | 2004 |
| 50HZ Electrical Limited | Manufacturing | 2024 |
| 51 Degrees Mobile Experts Limited | Administrative & support | 2009 |
| 51DEGREES.MOBI Limited | Information & communication | 2010 |
| 53 House LLP | | 2014 |
| 534 Build Ltd | Construction | 2024 |
| 55 Longridge Road (Management) Company Limited | Households | 1979 |
| 58 KR Limited | Other services | 2017 |
| 58 Portman Road Management Company Ltd | Real estate | 2013 |
| 58-60 London Road RTM Company Limited | Households | 2012 |
| 585 Consulting Ltd | Professional & scientific | 2023 |
| 585 Services Limited | Real estate | 2023 |
| 59 Christchurch Road Freehold Limited | Households | 2018 |
| 59-62 Arabian Drive (M.C.) Limited | Households | 2024 |
| 5AM Tea Break Limited | Information & communication | 2025 |
| 5D Education Ltd | Education | 2025 |
| 5G Consulting Limited | Information & communication | 1998 |
| 5M4R7 Innovation & Research Ltd. | Information & communication | 2024 |
| 5ON Group Limited | Professional & scientific | 2024 |
| 5STARSERVICESUK Ltd | Wholesale & retail | 2025 |
| 5STARSOURCING Ltd | Administrative & support | 2024 |
| 5X5 Properties Limited | Real estate | 2025 |
| 6 - 8 Q R Freehold Limited | Households | 2016 |
| 6 Brunswick Hill RTM Company Limited | Households | 2009 |
| 6 Pack Supplements Ltd | Wholesale & retail | 2015 |
| 6 Tails Ltd | Hospitality | 2016 |
| 60 Salisbury Road Management Limited | Real estate | 2003 |
| 61 Alexandra Road (Reading) Management Company Limited | Households | 1993 |
| 61 Western Elms Avenue Residents Limited | Households | 2013 |
| 61/63 South Street Management Limited | Households | 1988 |
| 618 Insight Ltd | Professional & scientific | 2016 |
| 618 Safesource Ltd | Manufacturing | 2016 |
| 62 and 64 Northumberland Avenue Management Company Limited | Households | 2017 |
| 63 Alexandra RD Freehold Limited | Households | 2020 |
| 64 Cockney Hill Residents Association Limited | Real estate | 2009 |
| 64-70 (Evens) Cannock Way Freehold Limited | Real estate | 2013 |
| 65 Properties Limited | Real estate | 2021 |