| 1ST Touch Coaching Ltd | Education | 2018 |
| 2 Cobham Terrace Greenhithe Limited | Households | 1999 |
| 2 Ferncroft Avenue Limited | Real estate | 1992 |
| 2 Holford Road Residents Association Limited | Real estate | 1993 |
| 2 Middleton Place Limited | Households | 1996 |
| 2 Nevern Road Limited | Households | 2004 |
| 2 Peerglow Ltd | Real estate | 2025 |
| 2 Sydenham Road Limited | Real estate | 2018 |
| 20 20 Optical Solutions Limited | Health & social care | 2017 |
| 2001 Payroll & Professional Services Limited | Professional & scientific | 1999 |
| 202 KH Watford Limited | Real estate | 2016 |
| 206 Gammons Lane Ltd | Real estate | 2019 |
| 207 Resolution Limited | Financial services | 2025 |
| 21 Rectory Road Rickmansworth Management Limited | Real estate | 1989 |
| 21 Theliner Limited | Hospitality | 2021 |
| 2112 Ltd | Professional & scientific | 2023 |
| 22 Queen's Gate Terrace Limited | Households | 1997 |
| 22ADVANTAGE Ltd | Arts & recreation | 2019 |
| 23 Clarendon Gardens Limited | Households | 1999 |
| 23 Oldfield Road Limited | Real estate | 2021 |
| 23 Wimpole Street Limited | Households | 1991 |
| 238 Gloucester Terrace RTM Company Ltd | Households | 2023 |
| 24 Carlingford Road Freehold Limited | Real estate | 2016 |
| 24 Dancer Road Limited | Households | 2014 |
| 24 Savanna C Ltd | Real estate | 2026 |
| 24/7 Logistics Ltd | Transport & logistics | 2025 |
| 24/7 Roofing Services Limited | Construction | 2025 |
| 246 Properties LP | | 2020 |
| 247 Cars Watford Limited | Transport & logistics | 2020 |
| 24LONDON Invest Ltd | Information & communication | 2021 |
| 25. Charlwood Street Properties Limited | Extraterritorial | 2009 |
| 25/34 Lawns Court Freehold (Wembley) Limited | Households | 1985 |
| 25TH Century Trading Limited | Real estate | 2024 |
| 26 Devonshire Place Limited | Real estate | 2012 |
| 26 Goldhurst Terrace Ltd | Households | 2013 |
| 26 Rosary Gardens Limited | Households | 2006 |
| 262 Consultants Ltd | Professional & scientific | 2014 |
| 26MERCER Developments Ltd | Real estate | 2021 |
| 27 Essex Road Freehold Limited | Households | 2010 |
| 27 PGT (Management) Limited | Real estate | 2000 |
| 27 the Vale Management Company Limited | Households | 2017 |
| 27 YMR Construction Ltd | Construction | 2024 |
| 27,29,30,31,33,35,37 Cobbetts Ride Management Company Limited | Households | 2023 |
| 274 Brockley Road Management Company Limited | Households | 2020 |
| 28 BVL Limited | Real estate | 2019 |
| 28 Chalk Hill Limited | Households | 2005 |
| 28 Films Limited | Information & communication | 2009 |
| 28 Million Years Limited | Other services | 2026 |
| 28/29 Collingham Gardens Management Limited | Households | 1994 |
| 288 Grays Inn Road Freehold Limited | Households | 2017 |
| 29 Randolph Avenue Limited | Households | 1986 |
| 29 ST Stephens Gardens Limited | Households | 2020 |
| 2CHE Hairdresser Ltd | Wholesale & retail | 2020 |
| 2EO Factory Ltd | Manufacturing | 2015 |
| 2H Developments Limited | Construction | 2020 |
| 2K16 Limited | Professional & scientific | 2016 |
| 2M Hyde Park Ltd | Real estate | 2026 |
| 3 Brothers Flooring Ltd | Construction | 2023 |
| 3 Lyndhurst Terrace Limited | Households | 1999 |
| 3 Minster Road Management Co Ltd | Real estate | 2001 |
| 3 Palace Gate Management Limited | Real estate | 2001 |
| 3 Star Takeaway Limited | Hospitality | 2026 |
| 3 to 5 Canfield Gardens Limited | Real estate | 2012 |
| 30 Clarendon Gardens Limited | Households | 1985 |
| 30-32 Maresfield Gardens Limited | Real estate | 2010 |
| 302 Gibson Quay Ltd | Real estate | 2024 |
| 304 Lower High Street RTM Company Limited | Households | 2019 |
| 307PROPERTIES Limited | Real estate | 2026 |
| 30A Woodlands Park Ltd | Financial services | 2023 |
| 31 Woodlands Park Ltd | Financial services | 2023 |
| 31 Woodside Grove Holding Company Limited | Households | 2021 |
| 31 Woodside Grove Management Company Limited | Households | 1985 |
| 31-33 Dollis Avenue Management Company Limited | Households | 2023 |
| 31-35 Courtfield Gardens Management Limited | Households | 2000 |
| 313 Apparel Ltd | Wholesale & retail | 2024 |
| 313 Autos Ltd | Wholesale & retail | 2026 |
| 313 Recruiters Ltd | Administrative & support | 2022 |
| 321 Preston Road Management Company Limited | Households | 1976 |
| 33-41 Earls Court Square Management Limited | Households | 2000 |
| 333 Estates Ltd | Real estate | 2023 |
| 338 Cable Hire Ltd | Manufacturing | 2018 |
| 338 Solutions Limited | Administrative & support | 2025 |
| 34-45 LEA SQ Ltd | Real estate | 2019 |
| 344 Watford Tattoo Ltd | Other services | 2019 |
| 35 Marlborough Road Ltd | Real estate | 2023 |
| 35 Queen's Gate Limited | Households | 1988 |
| 35 Randolph Avenue Limited | Real estate | 1983 |
| 358 Finchley Road Limited | Construction | 2003 |
| 358 Martin Way Limited | Real estate | 2018 |
| 36 Maytree Crescent (Freehold) Limited | Professional & scientific | 2014 |
| 360 Agile Limited | Information & communication | 2024 |
| 360 CSC Ltd | Real estate | 2021 |
| 360 MC Ltd | Real estate | 2022 |
| 360 MMC Ltd | Real estate | 2018 |
| 365 Switch on Electrics Ltd | Professional & scientific | 2026 |
| 365 Vitamins Limited | Wholesale & retail | 2013 |
| 36RS Freehold Limited | Households | 2019 |
| 37 Eastbury Road Management Company Limited | Households | 1988 |
| 38 Belsize Square Limited | Professional & scientific | 2010 |
| 38 Eastbury Avenue RTM Company Limited | Households | 2025 |