| 21ST Century Conservatories and Fascias Limited | Salisbury | 1995 |
| 21ST Century Construction Ltd | Liverpool | 2025 |
| 21ST Century Design & Build Ltd | London | 2023 |
| 21ST Century Eco-Homes Limited | Pontefract | 2013 |
| 21ST Century Electrics Ltd | Ratcliffe On Soar | 2011 |
| 21ST Century Energy Solutions Limited | Melton Mowbray | 2011 |
| 21ST Century Flooring Ltd | Chatham | 2016 |
| 21ST Century Style Limited | Riding Mill | 1999 |
| 21ST Century Trade Windows Limited | Poulton-Le-Fylde | 2013 |
| 21ST Century Window Centres Limited | Poulton-Le-Fylde | 2012 |
| 21ST Mile Limited | Portsmouth | 2017 |
| 21ST Office Interiors Limited | Woverhampton | 2011 |
| 22 Amelia Street Management Limited | | 2006 |
| 22 Bishopsgate (Devco) Limited | London | 2015 |
| 22 Bishopsgate (Nominee 1) Limited | London | 2015 |
| 22 Bishopsgate (Nominee 2) Limited | London | 2015 |
| 22 Bishopsgate General Partner Limited | London | 2015 |
| 22 Construction Ltd | Bishop'S Stortford | 2025 |
| 22 Degree Building Services Ltd | Jarrow | 2026 |
| 22 Degrees Air Conditioning Ltd | Lichfield | 2019 |
| 22 Degrees Heating Limited | Ramsgate | 2017 |
| 22 Energy Systems Ltd | Dumfries | 2025 |
| 22 FRG Ltd | London | 2025 |
| 22 G Construction Ltd | Brentford | 2024 |
| 22 Grosvenor Hill Court Limited | London | 2022 |
| 22 Ladbroke Square Ltd | London | 2015 |
| 22 Metal Construction Limited | Kilburn | 2018 |
| 22 Mount Street Mayfair Limited | London | 2022 |
| 22 Property (SW) Ltd | London | 2026 |
| 22 QR Limited | Aberdeen | 2023 |
| 22 Stockley Street Limited | Northampton | 2021 |
| 22 the Street (WF) Limited | Margate | 2022 |
| 22-24 Cheriton Gardens Limited | Folkestone | 2026 |
| 220 Interiors Ltd. | Cardiff | 2013 |
| 220A Westbourne Grove Limited | London | 2012 |
| 222 Collective Ltd | Hove | 2025 |
| 222 Construction Ltd | Manchester | 2024 |
| 222 Contracts Ltd | Sutton | 2014 |
| 222 Developments Limited | Swansea | 2011 |
| 222 Electrical Ltd | Thornton Cleveleys | 2020 |
| 222 Technologies Ltd | Borehamwood | 2026 |
| 222-224 Westbourne Grove Limited | London | 2016 |
| 223 Balham Limited | London | 2026 |
| 223 Streatham Road Developments Ltd | Beckenham | 2017 |
| 224422 Ltd | London | 2024 |
| 225 City Residences Limited | London | 2020 |
| 225 City Road Limited | London | 2020 |
| 225 Dereham Road Limited | Norwich | 2021 |
| 225 Developments Limited | Worthing | 2021 |
| 225 Marsh Wall Holdco Limited | London | 2019 |
| 225 Marsh Wall Opco Limited | London | 2022 |
| 225 Marsh Wall Propco Limited | London | 2019 |
| 225 Quadrangle Towers Limited | London | 2015 |
| 226 - 228 the Strand Ltd | London | 2015 |
| 226 HSS Ltd | Hampton | 2021 |
| 227 the Strand Limited | London | 2017 |
| 228 Projects Limited | Worcester | 2025 |
| 228 Strand Road Limited | Barnard Castle | 2021 |
| 22A Abel Close Ltd | London | 2019 |
| 22ELECTRICAL Ltd | Bures | 2022 |
| 22G Property Maintenance Ltd | Wolverhampton | 2022 |
| 22G Transport Ltd | Ilford | 2023 |
| 23 Access Ltd | London | 2021 |
| 23 Park Road Kenley Limited | Brecon | 2018 |
| 23 Project Management Ltd | Bournemouth | 2021 |
| 23 SW Limited | London | 2025 |
| 230 Electrical Ltd | Bolton | 2020 |
| 230 Volts Ltd | Bray On Thames | 2022 |
| 230VTESTING.COM Ltd | Basildon | 2022 |
| 234 the Rise Limited | London | 2019 |
| 235 Developers PLC | London | 2020 |
| 235 Water Gardens Limited | London | 2016 |
| 237 GAS Limited | London | 2024 |
| 237 Westbourne Grove Limited | London | 2018 |
| 239 Collections Ltd | Poole | 2021 |
| 239 Kingsway Hove Ltd | Hove | 2021 |
| 23G Electrical Ltd | Stevenage | 2023 |
| 23THIRTY Ltd | Harrow | 2021 |
| 23W Limited | Glasgow | 2011 |
| 24 - 7 Emergency Drainage Limited | London | 2023 |
| 24 7 Manpower Limited | Staines-Upon-Thames | 2021 |
| 24 7 Property Maintenance Limited | London | 2014 |
| 24 ALL ABC Ltd | Edinburgh | 2026 |
| 24 British Builders Ltd | London | 2017 |
| 24 British Maintenance Ltd | London | 2016 |
| 24 Build Limited | Rochford | 2019 |
| 24 Cadogan Square Ltd | Chelsea | 2022 |
| 24 Carat Interiors Ltd | London | 2026 |
| 24 Church Street Developments Limited | London | 2022 |
| 24 Coleherne Road Limited | London | 2014 |
| 24 Concanon Road Limited | London | 2020 |
| 24 Contracts Ltd | London | 2018 |
| 24 Craigour AVE Ltd | Edinburgh | 2025 |
| 24 Devco Ltd | Christchurch | 2024 |
| 24 Eco Ltd | Swinton | 2021 |
| 24 Electrical Ltd | Wirral | 2021 |
| 24 Electrics Limited | Glenrothes | 2021 |
| 24 Fifteen Ltd | London | 2017 |
| 24 FIX Ltd | London | 2024 |
| 24 Flooring Ltd | Rochester | 2014 |