| 300 West END Lane Management Company Limited | Households | 1998 |
| 3000 Years Limited | Information & communication | 2022 |
| 300700 Ltd | Wholesale & retail | 2022 |
| 300MG Ltd | Wholesale & retail | 2025 |
| 301 Pictures Ltd | Arts & recreation | 2021 |
| 301 Vision Ltd | Information & communication | 2025 |
| 3011 Ltd | Other services | 2023 |
| 301ST Ltd | Information & communication | 2026 |
| 302 Earlsfield Management Limited | Households | 1998 |
| 302 MD Ltd | Professional & scientific | 2024 |
| 303 Cavendish Road Management Company Limited | Real estate | 2015 |
| 303 Global Ltd | Professional & scientific | 2026 |
| 303 Information Security Ltd | Information & communication | 2021 |
| 303 Lordship Lane RTM Company Limited | Households | 2021 |
| 303 Partners Ltd | Professional & scientific | 2014 |
| 303 Squadron Polish Saturday School | Education | 2016 |
| 3031 Table Ltd | Hospitality | 2025 |
| 3032 Powney Road Limited | Administrative & support | 1999 |
| 303EVENT Ltd | Administrative & support | 2016 |
| 304 Advisors Ltd | Households | 2017 |
| 304 Archway Road Freehold Limited | Extraterritorial | 2010 |
| 304 Beauty Bar Ltd | Wholesale & retail | 2024 |
| 304 Group Ltd | Professional & scientific | 2021 |
| 304 Holding Ltd | Real estate | 2024 |
| 304 Walworth Limited | Real estate | 2025 |
| 305 Amhurst Road Limited | Households | 2002 |
| 305 Chase House Limited | Real estate | 2017 |
| 305 Digital Asset Management Ltd | Administrative & support | 2023 |
| 305 Harrow Road Limited | Wholesale & retail | 2017 |
| 305 Queenstown Road Management Ltd | Real estate | 2007 |
| 305-307 Camberwell Road RTM Company Ltd | Households | 2026 |
| 306 Investments Ltd | Real estate | 2024 |
| 307 Amhurst Road Freehold Limited | Households | 2001 |
| 307 Barking Road RTM Company Limited | Households | 2022 |
| 307 NKR Freehold Limited | Households | 2020 |
| 307 Preston Ltd | Real estate | 2021 |
| 309 Camberwell Road Management Limited | Real estate | 2008 |
| 309 Ltd | Information & communication | 2026 |
| 309 SDQ Limited | Real estate | 2019 |
| 30A & 31 Homestead Road Limited | Households | 1999 |
| 30A Architecture Ltd | Professional & scientific | 2018 |
| 30A Sandford Avenue Freehold Limited | Real estate | 2014 |
| 30A Summerhill Road Ltd | Households | 2026 |
| 30A Summerhill Road Management Ltd | Households | 2024 |
| 30CAPITALSTAY Ltd | Hospitality | 2025 |
| 30CG2 Limited | Real estate | 2024 |
| 30CRFH Ltd | Administrative & support | 2021 |
| 30CS Ltd | Financial services | 2017 |
| 30FIRE Ltd | Arts & recreation | 2026 |
| 30GLOBE Limited | Real estate | 2024 |
| 30TH State Productions Limited | Information & communication | 2021 |
| 30TH Studios Ltd | Information & communication | 2024 |
| 31 & 32 Manchester Street Limited | Administrative & support | 2019 |
| 31 & 33 Tennyson Road London Limited | Households | 2017 |
| 31 - 36 Pasteur Close RTM Company Limited | Households | 2023 |
| 31 - 37 Dukeson Properties Limited | Real estate | 2018 |
| 31 - 38 Fairlawn RTM Company Limited | Households | 2024 |
| 31 Acacia Road Limited | Households | 2018 |
| 31 Addison Gardens Limited | Real estate | 2000 |
| 31 Agincourt Road Limited | Households | 2010 |
| 31 Albert Bridge Road Limited | Administrative & support | 2013 |
| 31 Alexandra Drive Management Company Limited | Households | 1996 |
| 31 Alexandra Grove RTM Company Limited | Households | 2015 |
| 31 Almorah Road Limited | Real estate | 2003 |
| 31 and 31A Eglington Road Ltd | Households | 2018 |
| 31 Archel Road Management Company Limited | Households | 1999 |
| 31 Archway Road Freehold Limited | Households | 2023 |
| 31 Arlington Gardens Limited | Extraterritorial | 2010 |
| 31 Arundel Gardens Management Co. Limited | Households | 1983 |
| 31 Ashbourne Avenue Limited | Households | 2007 |
| 31 Batoum Gardens Ltd | Real estate | 2021 |
| 31 Beadnell Road Freehold Ltd | Households | 2015 |
| 31 Belitha Villas Limited | Households | 2009 |
| 31 Belmont Road Limited | Households | 2012 |
| 31 Beresford Road Limited | Households | 2004 |
| 31 Birchington Road NW6 Limited | Households | 2014 |
| 31 Bloomfield Limited | Real estate | 2024 |
| 31 Borwick Holdings Limited | Households | 2023 |
| 31 Bouverie Road Ltd | Households | 2022 |
| 31 Branksome Road Limited | Administrative & support | 2007 |
| 31 Brondesbury Villas Freehold Limited | Households | 2011 |
| 31 Broughton Road Limited | Real estate | 2011 |
| 31 Buckley Road (Residents) Limited | Real estate | 1990 |
| 31 Camden Square Limited | Real estate | 2014 |
| 31 Camden Square RTM Company Limited | Real estate | 2013 |
| 31 Carlingford Road NW3 Management Company Limited | Real estate | 1991 |
| 31 Castle Avenue Limited | Households | 2014 |
| 31 Castlebar Road Limited | Households | 2003 |
| 31 Cautley Avenue Limited | Households | 2011 |
| 31 Cavendish Place Management (Eastbourne) Limited | Households | 2010 |
| 31 Central Hill Management Company Limited | Households | 1984 |
| 31 Chadwin Road RTM Company Limited | Households | 2013 |
| 31 Charlemont Road Limited | Real estate | 2008 |
| 31 Cintra Park Freehold Management Limited | Households | 2020 |
| 31 Cliveden Place Ltd | Real estate | 2017 |
| 31 Coleherne Road RTM Company Ltd | Households | 2014 |
| 31 Comyn Road RTM Company Limited | Households | 2025 |
| 31 Consultancy Ltd | Information & communication | 2017 |
| 31 Conway Street Management Company Limited | Real estate | 2002 |
| 31 Corfton Road Ealing RTM Company Limited | Households | 2020 |