| Crofton Consulting Ltd | Financial services | 2024 |
| Cromwell Gardens Limited | Real estate | 1996 |
| Cromwell Rentals 1 Ltd | Real estate | 2017 |
| Cromwell Rentals 3 Ltd | Real estate | 2017 |
| Cromwell Road (Teddington) Residents Association Limited | Households | 2002 |
| Cross Performance Ltd | Arts & recreation | 2026 |
| Cross Research Limited | Professional & scientific | 2012 |
| Crossfade Media Limited | Information & communication | 2022 |
| Crossroads Fitness Ltd | Arts & recreation | 2022 |
| Crownet Solutions Limited | Information & communication | 1998 |
| Crumbs Sandwich & Coffee Bar Ltd | Hospitality | 2013 |
| Crystal Clear FS Ltd | Financial services | 2013 |
| CSW Design and Management Ltd | Construction | 2024 |
| Cube One Limited | Professional & scientific | 2010 |
| Cubitus Consulting Limited | Professional & scientific | 2020 |
| Cucoloris Limited | Information & communication | 2014 |
| Culhane Construction Limited | Construction | 2015 |
| Cullasy Doran Developments Ltd | Real estate | 2020 |
| Cult Vapour Ltd | Wholesale & retail | 2017 |
| Culture Co Global Ltd | Professional & scientific | 2023 |
| Cutting IT Close Ltd | Professional & scientific | 2024 |
| Cxoflex Limited | Information & communication | 2023 |
| Cxreview Limited | Information & communication | 2016 |
| D H Plumbing London Ltd | Construction | 2025 |
| D4CLS Limited | Professional & scientific | 2013 |
| DAA Residential Limited | Real estate | 2002 |
| Daedalus Strategy & Investments Ltd | Professional & scientific | 2020 |
| Dagoo Ltd | Information & communication | 2025 |
| Daisy Home & Gifts Ltd | Wholesale & retail | 2023 |
| Daisy Roots Movement CIC | Arts & recreation | 2026 |
| Dalenote Ltd | Professional & scientific | 2023 |
| Dalyell Investments Ltd | Real estate | 2021 |
| Daman Limited | Hospitality | 2020 |
| Danby Associates Limited | Mining & quarrying | 2008 |
| Dandelion Teddington Limited | Wholesale & retail | 2023 |
| Daniel Turner Search Ltd | Professional & scientific | 2019 |
| Daniel Waghorn Technical Ltd | Information & communication | 2018 |
| Dapper Barber Ltd | Other services | 2017 |
| Dare Co Group Ltd | Financial services | 2023 |
| Darkside Communications Ltd | Professional & scientific | 2013 |
| DAS Organisation Limited | Professional & scientific | 2013 |
| Datacentrespeak Consultants Ltd | Information & communication | 2015 |
| Datapack Ltd | Wholesale & retail | 2023 |
| Datastrobe Ltd | Information & communication | 2007 |
| Date & Daffodils Ltd | Hospitality | 2024 |
| Dave Berry Electricals Limited | Construction | 2024 |
| David England & Associates Ltd | Professional & scientific | 2012 |
| David Wilson Optometrists Limited | Wholesale & retail | 2010 |
| Day JOB Theatre Ltd | Arts & recreation | 2024 |
| DCC Consulting Limited | Administrative & support | 2025 |
| Dead Good Books Ltd | Information & communication | 2020 |
| Decentric Music Ltd. | Arts & recreation | 1986 |
| Decision Pathways Ltd | Professional & scientific | 2022 |
| Deepwatch Limited | Administrative & support | 2025 |
| Delosis Limited | Information & communication | 2003 |
| Dementia Living Ltd | Administrative & support | 2025 |
| Denimbuyer Limited | Administrative & support | 2012 |
| Dennis Associates Ltd | Professional & scientific | 2013 |
| Dennish Limited | Education | 2026 |
| Deryn Harvey Consulting Ltd | Professional & scientific | 2010 |
| Descriptor Ltd | Construction | 2014 |
| Design LS Ltd | Manufacturing | 2011 |
| Design Workspace Limited | Real estate | 2019 |
| Detoma Advisers Ltd | Information & communication | 2023 |
| Develi 7878 Ltd | Hospitality | 2023 |
| Developed Africa Limited | Other services | 2013 |
| Devilsgrip Limited | Information & communication | 2010 |
| Devon Court (Hampton) Residents Association Limited | Households | 1964 |
| Dexter Brands Ltd | Wholesale & retail | 2014 |
| Dexters Estate Agents Limited | Extraterritorial | 2015 |
| Dexters Group Ltd | Extraterritorial | 2015 |
| Dexters Holdco Limited | Professional & scientific | 2021 |
| Dexters Holdings Limited | Professional & scientific | 1999 |
| Dexters Midco Limited | Professional & scientific | 2021 |
| Dexters Newco Limited | Professional & scientific | 2021 |
| Dexters Topco Limited | Professional & scientific | 2021 |
| Dhall Food & Wines Ltd | Wholesale & retail | 2023 |
| Dhiren Raghvani Enterprises (D.R.E.) Limited | Information & communication | 2015 |
| Diamond Deer Consultancy Ltd | Construction | 2025 |
| Diamond Deer Ltd | Construction | 2021 |
| Diamond Hotels Limited | Hospitality | 2006 |
| Diamond Valet Detailing Ltd | Wholesale & retail | 2021 |
| Dieselmaker Limited | Wholesale & retail | 2011 |
| Digger BEE Limited | Real estate | 2023 |
| Digital Composite Limited | Information & communication | 2012 |
| Digital Content Associates Limited | Information & communication | 2010 |
| Digital Garage Facilities Limited | Information & communication | 2004 |
| Digital Matter Limited | Information & communication | 2017 |
| Digital Partners Limited | Information & communication | 2012 |
| Digital Umbrella Limited | Administrative & support | 2015 |
| Diligensia Limited | Information & communication | 2015 |
| Dillons Services Limited | Construction | 2004 |
| Distant EYE Media Limited | Information & communication | 2012 |
| DJH Logistics Limited | Transport & logistics | 2025 |
| DJT Consulting Services Limited | Information & communication | 2016 |
| DK Games Limited | Arts & recreation | 2003 |
| Dlady Ltd | Other services | 2023 |
| DLD UK Limited | Real estate | 2009 |
| DLK Productions Ltd | Information & communication | 2021 |
| DLK Properties (Teddington) Limited | Real estate | 2024 |