| 100 Women in Finance Limited | Other services | 2007 |
| 100 Wyatt Park Road Management Company Limited | Real estate | 2004 |
| 100 X Group Ltd | Wholesale & retail | 2024 |
| 100 Years Thinking Ltd | Information & communication | 2019 |
| 100% Care Services Limited | Health & social care | 2018 |
| 100% Content Group Ltd | Information & communication | 2017 |
| 100% Digital Ltd | Arts & recreation | 2012 |
| 100% Fruit & VEG Limited | Wholesale & retail | 2016 |
| 100% Holy Spirit Ltd | Other services | 2012 |
| 100% Invoice Ltd | Manufacturing | 2026 |
| 100% IT Recruitment Limited | Administrative & support | 2004 |
| 100% M&M Limited | Transport & logistics | 2021 |
| 100% Open Limited | Professional & scientific | 2009 |
| 100% Peach Limited | Hospitality | 2006 |
| 100% Soccer School C.I.C. | Arts & recreation | 2014 |
| 100% Solar Energy Ltd | Construction | 2021 |
| 100%NATURAL Juice Ltd | Manufacturing | 2024 |
| 100-102 Mackenzie Road RTM Limited | Households | 2024 |
| 100-111 Holmbury Grove (Freehold) Limited | Households | 2000 |
| 1000 Acre Holdings Limited | Financial services | 2023 |
| 1000 Cookbooks Limited | Information & communication | 2014 |
| 1000 Fursan Ltd | Information & communication | 2025 |
| 1000 Mile Travel Group Ltd | Administrative & support | 2017 |
| 1000 Properties Limited | Real estate | 2018 |
| 1000 Property Limited | Real estate | 2023 |
| 1000 Rooms Ltd | Real estate | 2016 |
| 1000 Volts Ltd | Construction | 2017 |
| 1000 Words Photography Ltd | Arts & recreation | 2009 |
| 10000 LUX Ltd | Manufacturing | 2020 |
| 10000 Volt Technologies Limited | Information & communication | 2003 |
| 1000HEADS Group Limited | Administrative & support | 2000 |
| 1000HEADS Limited | Professional & scientific | 2010 |
| 1000LOFTS & Cabins Ltd | Real estate | 2024 |
| 1001 AI Limited | Information & communication | 2025 |
| 1001 Apartments Limited | Real estate | 2013 |
| 1001 Films Ltd | Information & communication | 2018 |
| 1001 Foundation Limited | Professional & scientific | 2018 |
| 1001 Inventions Limited | Arts & recreation | 2008 |
| 1001 Nights Productions Limited | Arts & recreation | 2007 |
| 1001 Winds Limited | Professional & scientific | 2007 |
| 1001VIVERE Ltd | Real estate | 2025 |
| 10021 Limited | Real estate | 2021 |
| 10025 Studios Limited | Information & communication | 2020 |
| 10027965 Limited | Financial services | 2016 |
| 10034719 Ltd | | 2016 |
| 1007 Productions Ltd | Information & communication | 2023 |
| 1008 Realty - a Ltd | Real estate | 2023 |
| 1009 Limited | Professional & scientific | 2023 |
| 100A Grove Park Management Company Limited | Households | 2022 |
| 100A VC LLP | | 2025 |
| 100AB IVY Road Ltd | Professional & scientific | 2014 |
| 100ASA Ltd | Information & communication | 2026 |
| 100CGI Studio Ltd | Information & communication | 2019 |
| 100CL Limited | Wholesale & retail | 2014 |
| 100DAYSOFNOCODE Ltd | Education | 2020 |
| 100FP Holding Ltd | Financial services | 2018 |
| 100K Creator Ltd | Information & communication | 2025 |
| 100KGEMS Ltd | Manufacturing | 2024 |
| 100KWRA Limited | Households | 2025 |
| 100MILLION Percent Limited | Professional & scientific | 2023 |
| 100MM Limited | Construction | 2026 |
| 100REBELS Ltd | Wholesale & retail | 2025 |
| 100SQFT Ltd | Extraterritorial | 2010 |
| 100TH Meridian Capital Ltd | Financial services | 2021 |
| 100X Entertainment Ltd | Extraterritorial | 2025 |
| 100X Holdings Limited | Real estate | 2025 |
| 100X Reps Limited | Information & communication | 2025 |
| 100X Tech Ltd | Information & communication | 2013 |
| 100YEARS Construction Ltd | Construction | 2021 |
| 100YGB Limited | Financial services | 2025 |
| 101 & 103 Replingham Road (Freehold) Limited | Households | 2023 |
| 101 Accounting Services Limited | Professional & scientific | 2007 |
| 101 Acres Ltd | Construction | 2026 |
| 101 Adelaide Grove Limited | Real estate | 2009 |
| 101 ALL in Investments Ltd | Hospitality | 2023 |
| 101 ALL Saints Ltd | Real estate | 2023 |
| 101 and 101A Plashet Grove Freehold Limited | Households | 2022 |
| 101 Arabian Nights Ltd | Hospitality | 2020 |
| 101 Arica Road Ltd | Households | 2021 |
| 101 Athletic Limited | Wholesale & retail | 2025 |
| 101 Babington Road RTM Company Limited | Households | 2015 |
| 101 Bartholomew Road RTM Company Limited | Households | 2008 |
| 101 Callander Estates Ltd | Real estate | 2022 |
| 101 Canfield Gardens Management Limited | Households | 2022 |
| 101 Capital Limited | Professional & scientific | 2022 |
| 101 Carshalton Ltd | Real estate | 2026 |
| 101 Cleveland Street JV Company Limited | Construction | 2019 |
| 101 Cleveland Street Midco 1 Limited | Construction | 2019 |
| 101 Cleveland Street Midco 2 Limited | Construction | 2019 |
| 101 Comeragh Road Management Company Ltd | Households | 2026 |
| 101 Commercial Properties Limited | Real estate | 2023 |
| 101 Contemporary Indian Cuisine Ltd | Hospitality | 2025 |
| 101 Cranwich Limited | Real estate | 2025 |
| 101 Digital Products Ltd | Wholesale & retail | 2021 |
| 101 Earls Court Road Limited | Real estate | 1999 |
| 101 Elgin Avenue Management Company Limited | Households | 1994 |
| 101 ELM Park Management Limited | Households | 2004 |
| 101 Estates & Management Ltd | Real estate | 2017 |
| 101 Estates Ltd | Real estate | 2026 |
| 101 Films Limited | Information & communication | 2011 |