| 1 ALS Limited | Education | 2016 |
| 1 and 1A Lancaster Gardens LLP | | 2013 |
| 1 and 2 Academy Buildings Management Company Limited | Real estate | 2021 |
| 1 and 2 Bloomsbury Place Limited | Extraterritorial | 2010 |
| 1 and 2 Bowling Green Place Freehold Company Limited | Real estate | 2015 |
| 1 and 2 Point Cottages Management Limited | Extraterritorial | 2010 |
| 1 and 3 Eardley Crescent Ltd. | Households | 2011 |
| 1 and 3 Santos Road Limited | Households | 2025 |
| 1 Annington Road Freehold Limited | Households | 2018 |
| 1 Archway Mews Freehold Limited | Households | 2017 |
| 1 Ariel Way Tenant Limited | Real estate | 2019 |
| 1 Arkwright Road Limited | Financial services | 2017 |
| 1 ARM Lighting Ltd | Construction | 2020 |
| 1 Arundel Close E15 Limited | Real estate | 2019 |
| 1 AS Talent Ltd | Administrative & support | 2017 |
| 1 Ascalon Street RTM Company Ltd | Households | 2011 |
| 1 Asset Management Limited | Financial services | 2013 |
| 1 Auckland Hill Limited | Households | 2018 |
| 1 AV Pro Ltd | Wholesale & retail | 2024 |
| 1 Avenue Mews Management Company Limited | Hospitality | 2005 |
| 1 Baker's Rents Limited | Real estate | 2020 |
| 1 Baker's ROW Residents Limited | Households | 2013 |
| 1 Barlow Place Limited | Households | 2012 |
| 1 Bassett Road Management Company Limited | Households | 2004 |
| 1 Battersea Rise Limited | Real estate | 2007 |
| 1 Battison Crescent Ltd | Real estate | 2021 |
| 1 Beaufort Gardens RTM Company Ltd | Households | 2020 |
| 1 Beaufort Street Limited | Professional & scientific | 1999 |
| 1 Belsize Avenue Limited | Households | 2000 |
| 1 Belsize Park Limited | Real estate | 2009 |
| 1 Berry Street Capital Ltd | Real estate | 2026 |
| 1 Berry Street Ltd | Real estate | 2026 |
| 1 Big Data Management Limited | Extraterritorial | 1994 |
| 1 Bina Gardens Freehold Limited | Households | 1997 |
| 1 Birnam Road (Freehold) Limited | Households | 2010 |
| 1 Bishops Avenue Limited | Administrative & support | 2018 |
| 1 Bishops Road Limited | Households | 1995 |
| 1 Blurton Road Management Company Limited | Households | 2022 |
| 1 Boutflower Road RTM Company Limited | Real estate | 2012 |
| 1 Bouverie RD Ltd | Hospitality | 2025 |
| 1 Bovingdon Road Freehold Limited | Households | 2002 |
| 1 Bryanston Square Freehold Limited | Hospitality | 2013 |
| 1 BS Issuer Limited | Financial services | 2026 |
| 1 Buckland Crescent RTM Company Limited | Administrative & support | 2008 |
| 1 Cargreen Road RTM Company Ltd | Real estate | 2016 |
| 1 Castle Hill Limited | Real estate | 2024 |
| 1 Castle Ltd | Real estate | 2025 |
| 1 Caversham Road Limited | Real estate | 2011 |
| 1 CDM Ltd | Construction | 2014 |
| 1 CHA Ltd | Hospitality | 2024 |
| 1 Championship Ltd | Arts & recreation | 2020 |
| 1 Chancel Street Limited | Real estate | 2019 |
| 1 Charlton Avenue Limited | Real estate | 2024 |
| 1 Charter Walk Ltd | Wholesale & retail | 2016 |
| 1 Checkout Worldwide Limited | Wholesale & retail | 2024 |
| 1 Chepstow Villas Limited | Households | 1989 |
| 1 Chil (F1) Limited | Real estate | 2019 |
| 1 Church Terrace Ltd | Hospitality | 2015 |
| 1 Churton Street Limited | Real estate | 2021 |
| 1 Cintra Park Residents Company Limited | Households | 2002 |
| 1 City Garden ROW Headlease Limited | Real estate | 2025 |
| 1 Clearview House Ltd | Real estate | 2025 |
| 1 Clerkenwell Green Freehold Limited | Households | 2013 |
| 1 Click Digital Management Limited | Professional & scientific | 2023 |
| 1 Click Estate Management Ltd | Real estate | 2021 |
| 1 Click Holdings Ltd | Water & waste | 2023 |
| 1 Click Homes (Sales) Ltd | Real estate | 2013 |
| 1 Click Homes Ltd | Real estate | 2008 |
| 1 Click JOB Ltd | Construction | 2018 |
| 1 Click Properties Limited | Real estate | 2012 |
| 1 Click Sports Management Limited | Arts & recreation | 2015 |
| 1 Clifton Gardens Limited | Households | 1984 |
| 1 Cloud Group Limited | Information & communication | 2016 |
| 1 Collingham Road Limited | Real estate | 2018 |
| 1 Colnbrook Street Management Company Limited | Households | 2010 |
| 1 Commercial Property Limited | Real estate | 2025 |
| 1 Community Project C.I.C. | Arts & recreation | 2012 |
| 1 Concierge Services Ltd | Other services | 2021 |
| 1 Concorde Freehold Limited | Real estate | 2025 |
| 1 Concorde Way RTM Company Ltd | Households | 2016 |
| 1 Consilium Legal Ltd | Professional & scientific | 2026 |
| 1 Control Limited | Administrative & support | 2022 |
| 1 Coronet Street RTM Company Limited | Households | 2024 |
| 1 Corrance Road (Freehold) Limited | Real estate | 2012 |
| 1 Cosmetic Group Ltd | Health & social care | 2020 |
| 1 Courtnell Street Limited | Households | 2019 |
| 1 Cranwich Road Management Company Limited | Households | 2004 |
| 1 Crescent Management Limited | Households | 2021 |
| 1 Crescent Way RTM Company Limited | Households | 2006 |
| 1 Crofton Limited | Real estate | 2021 |
| 1 Cromwell Crescent Limited | Administrative & support | 1995 |
| 1 Crookham Road Management Company Limited | Households | 1990 |
| 1 Crouch END Hill Ltd | Real estate | 2022 |
| 1 Cumberland Park Residents Association Limited | Households | 1997 |
| 1 Cumbrian Gardens Freehold Ltd | Administrative & support | 2017 |
| 1 Cupar Road (Freehold) Limited | Real estate | 2013 |
| 1 Cyber Valley Limited | Information & communication | 2020 |
| 1 Dalmore Road Limited | Administrative & support | 1998 |
| 1 Daws Close Limited | Real estate | 2025 |
| 1 Day Development Limited | Information & communication | 2025 |