| 4 Point Group Limited | Administrative & support | 2024 |
| 4 Point Property Ltd | Construction | 2024 |
| 4 Polworth Road Limited | Professional & scientific | 1998 |
| 4 Popes Lane Management Company Limited | Extraterritorial | 2012 |
| 4 Power Engineering Ltd | Construction | 2012 |
| 4 Precision Ltd | Manufacturing | 2021 |
| 4 Probyn Road Management Ltd | Other services | 2020 |
| 4 Procurement Ltd | Wholesale & retail | 2024 |
| 4 Quarry Terrace Limited | Real estate | 2017 |
| 4 Quarry Terrace RTM Company Limited | Real estate | 2013 |
| 4 Quarter Homes Ltd | Real estate | 2022 |
| 4 Qubes Ltd | Professional & scientific | 2018 |
| 4 Queen's Gardens Management Limited | Households | 1989 |
| 4 Queens Avenue, Muswell Hill Limited | Households | 2010 |
| 4 R'S Consultancy Limited | Administrative & support | 2006 |
| 4 Randolph Crescent Limited | Households | 1982 |
| 4 Riversdale Road Ltd | Households | 2023 |
| 4 Rosecroft Avenue Limited | Households | 1972 |
| 4 Rosehill Road Management Company Ltd | Real estate | 2003 |
| 4 Rosemary Terrace Limited | Households | 2025 |
| 4 Russell Road Limited | Professional & scientific | 1989 |
| 4 Sale and Rent Ltd | Households | 2023 |
| 4 Schubert Road Management Company Limited | Households | 1995 |
| 4 Screen Consulting LLP | | 2023 |
| 4 Season Investment Limited | Real estate | 2011 |
| 4 Season Landscaping Ltd | Administrative & support | 2020 |
| 4 Season Trading Investment Limited | Extraterritorial | 2021 |
| 4 Season Trading Limited | Extraterritorial | 2021 |
| 4 Seasons Comfort Hvac Ltd | Construction | 2023 |
| 4 Seasons Deli Ltd | Wholesale & retail | 2022 |
| 4 Seasons Grounds Maintenance Limited | Administrative & support | 2021 |
| 4 Seasons Holdings Ltd | Transport & logistics | 2017 |
| 4 Seasons Holidays Ltd | Administrative & support | 2021 |
| 4 Seasons Marketing Ltd | Other services | 2025 |
| 4 Seasons Transport Ltd | Transport & logistics | 2017 |
| 4 Shaw Limited | Professional & scientific | 2025 |
| 4 Sherington Road Ltd | Households | 2024 |
| 4 Sight Properties Ltd | Real estate | 2026 |
| 4 Sight Ventures Limited | Hospitality | 2018 |
| 4 Sisters 14 Limited | Real estate | 2022 |
| 4 Sisters 15 Limited | Real estate | 2022 |
| 4 Sisters Consulting Ltd | Wholesale & retail | 2026 |
| 4 Sisters UK Limited | Health & social care | 2022 |
| 4 Site Electrical Limited | Construction | 2002 |
| 4 SJP @ Blackheath Limited | Households | 2008 |
| 4 Somerfield Road Residents Company Limited | Hospitality | 2002 |
| 4 Southampton Road Freehold Limited | Households | 2017 |
| 4 Southwood Lawn Road RTM Company Limited | Households | 2022 |
| 4 Spencer Hill Limited | Real estate | 1982 |
| 4 Springfield Road Freehold Limited | Extraterritorial | 2003 |
| 4 Square Capital UK Limited | Construction | 2018 |
| 4 Squared Management Ltd | Real estate | 2023 |
| 4 Squares Developments (London) Ltd | Construction | 2020 |
| 4 SRH Limited | Real estate | 2016 |
| 4 ST Georges Road Freehold Limited | Households | 2015 |
| 4 ST Stephens Gardens Limited | Households | 1999 |
| 4 ST. Luke's Avenue Freehold Company Limited | Real estate | 2005 |
| 4 Stages Limited | Administrative & support | 2014 |
| 4 Stagoni Ltd | Hospitality | 2025 |
| 4 Stanwick Road Flat Owners Limited | Other services | 2005 |
| 4 Stapleton Hall Road Limited | Real estate | 2015 |
| 4 Star Foods Ltd | Hospitality | 2018 |
| 4 Star Investments Ltd | Real estate | 2017 |
| 4 Steine ST Limited | Real estate | 2018 |
| 4 Steps Properties Ltd | Real estate | 2008 |
| 4 Stone Buildings Limited | Administrative & support | 2024 |
| 4 Storage Limited | Real estate | 2018 |
| 4 Stories Family Limited | Real estate | 2013 |
| 4 Stories Real Property LLP | | 2012 |
| 4 Stowe Road Limited | Households | 1998 |
| 4 Sutton Lane Management Co. Ltd | Real estate | 2019 |
| 4 Talbot Road Ltd. | Real estate | 2003 |
| 4 Tax Limited | Extraterritorial | 2011 |
| 4 Tefl Limited | Education | 2025 |
| 4 the Chase Freehold Limited | Real estate | 2024 |
| 4 the Common Freeholders Ltd | Extraterritorial | 2008 |
| 4 the Drive Property and Gardens Limited | Households | 2024 |
| 4 the Love of Barre Limited | Arts & recreation | 2022 |
| 4 the Love of Games Ltd | Arts & recreation | 2024 |
| 4 the Music Ltd | Information & communication | 2021 |
| 4 Thurlow Road (Management) Limited | Households | 1997 |
| 4 Trainers Ltd | Wholesale & retail | 2020 |
| 4 Tunes Music Publishing Limited | Administrative & support | 2008 |
| 4 U DIY Ltd | Administrative & support | 2020 |
| 4 U Ltd | Transport & logistics | 2023 |
| 4 U Media Ltd | Information & communication | 2009 |
| 4 Valleyfield Road Limited | Construction | 2016 |
| 4 Vermont Road Management Limited | Households | 2017 |
| 4 Walls Agents Ltd | Real estate | 2022 |
| 4 Walls Drylining Ltd | Real estate | 2018 |
| 4 Walls Management Limited | Administrative & support | 2014 |
| 4 Walls Ventures Ltd | Real estate | 2023 |
| 4 Warminster Road RTM Company Limited | Real estate | 2008 |
| 4 Way in Ltd | Other services | 2022 |
| 4 Weltje Road Limited | Households | 2024 |
| 4 West Hill Limited | Real estate | 2022 |
| 4 West Road Clapham Limited | Professional & scientific | 2011 |
| 4 Westbrook Road RTM Company Limited | Households | 2005 |
| 4 Wheel Barbers Limited | Other services | 2023 |
| 4 Wheel Wholesales Ltd | Other services | 2020 |