| City Press Knives Ltd | Manufacturing | 2005 |
| Citydesign (Manufacturing) Limited | Extraterritorial | 1999 |
| Civil Solutions UK Limited | Construction | 2006 |
| CKL Plumbing and Heating Limited | Construction | 2002 |
| Clare Bottle Limited | Other services | 2015 |
| Clarks of Ibstock Limited | Wholesale & retail | 2006 |
| Classic Trims (Leicester) Limited | Wholesale & retail | 1993 |
| Clayfield and Hall Limited | Manufacturing | 1939 |
| Clean Eaves Limited | Administrative & support | 2007 |
| Clickthrough Marketing Group Ltd | Professional & scientific | 2012 |
| Cliff Services Ltd | Information & communication | 2008 |
| Clinical Print Finishers (U.K.) Limited | Manufacturing | 1993 |
| Coalville Business Services Limited | Professional & scientific | 2000 |
| Coalville Carers Limited | Health & social care | 2004 |
| Coalville Times Limited | Manufacturing | 1945 |
| Coco Interiors Limited | Administrative & support | 2003 |
| Codex Wholesale Ltd | Wholesale & retail | 2019 |
| Colgrove Enterprises Limited | Wholesale & retail | 1999 |
| Colin Owen Limited | Construction | 2006 |
| Collingwood Day Nursery Limited | Other services | 2003 |
| Commatone Limited | Professional & scientific | 1984 |
| Complaints Management Consultancy Limited | Professional & scientific | 2004 |
| Computalabel International Limited | Information & communication | 1996 |
| Concrete Properties Limited | Real estate | 2005 |
| Connection Magazines Ltd | Professional & scientific | 2007 |
| CONSULT2DELIVER Limited | Professional & scientific | 2007 |
| Controlled Air Systems (Leicester) Ltd | Manufacturing | 2011 |
| Cooper-Hill Builders Limited | Construction | 2007 |
| Coopers Glass Co. Limited | Construction | 1973 |
| Cornerstone Tax Limited | Financial services | 2016 |
| Corporate Software Ltd | Wholesale & retail | 2003 |
| Corum Projects Limited | Professional & scientific | 2007 |
| Cosmos Newco UK Limited | Professional & scientific | 2012 |
| Court Bros (Kibworth) Limited | Wholesale & retail | 1989 |
| Creation Ministries International (Uk/Europe) Ltd | Wholesale & retail | 2006 |
| Creative Physics Limited | Professional & scientific | 2002 |
| Creoseal Limited | Manufacturing | 2002 |
| Cresswell Property Surveys Limited | Professional & scientific | 2000 |
| Cricket Central Ltd | Arts & recreation | 2021 |
| Crown Jewellers (Loughborough) Limited | Wholesale & retail | 2003 |
| Crownhouse Ifas Limited | Financial services | 2003 |
| Cruickshank Motors Limited | Wholesale & retail | 1984 |
| CS Microsystems Limited | Financial services | 2006 |
| CSG TRT Limited | Financial services | 2014 |
| CTA Media Ltd | Manufacturing | 2002 |
| CUBE3 Design & Build Ltd | Construction | 2014 |
| Curzonia (UK) Limited | Manufacturing | 2000 |
| Custom Lynx Cabling Ltd | Wholesale & retail | 2005 |
| Cybex Limited | Extraterritorial | 1997 |
| D & H Engineering Limited | Manufacturing | 1992 |
| D & M Tankers Ltd | Water & waste | 2007 |
| D&K Property Rentals Limited | Real estate | 2022 |
| D. J. S. Automotive Limited | Wholesale & retail | 2003 |
| D. J. Whyman Cars Limited | Wholesale & retail | 1977 |
| D. K. Ideas Limited | Professional & scientific | 2006 |
| D.G.Gas Services Limited | Energy | 2003 |
| Dainite Rubber Company Limited(The) | Manufacturing | 1946 |
| Daly Management Limited | Transport & logistics | 2007 |
| Damar International Limited | Wholesale & retail | 1985 |
| Danks Holdings Limited | Extraterritorial | 1937 |
| Darian Homes Limited | Construction | 1997 |
| Darrenpalm Paint Finishing Limited | Manufacturing | 1995 |
| David M Projects Ltd | Professional & scientific | 2007 |
| David Revitt Trading Limited | Manufacturing | 2003 |
| Davies Materials & Tools Limited | Construction | 1976 |
| Davis Haulage Group Limited | Financial services | 2015 |
| DC Promo Ltd | Information & communication | 2010 |
| Decorating by Kevin Williams Ltd | Construction | 2005 |
| DEE KAY Knitwear (UK) Ltd. | Real estate | 2000 |
| Delifrance (UK) Limited | Manufacturing | 1987 |
| Demark Holdings Ltd. | Financial services | 2003 |
| Demark Properties Limited | Real estate | 2003 |
| Demontfort Business Services Limited | Professional & scientific | 2003 |
| Dennis Olliver Limited | Real estate | 1970 |
| Derek Fitzgerald Plant Limited | Administrative & support | 2003 |
| Dermacare Direct Ltd | Wholesale & retail | 2009 |
| Designed 4 Access Limited | Extraterritorial | 2006 |
| Designer Tile Company Limited | Wholesale & retail | 2000 |
| DFA Resource Limited | Professional & scientific | 2007 |
| Dhaval Ishwar Ltd | Wholesale & retail | 2025 |
| Diam UK Ltd. | Manufacturing | 1993 |
| Digital MIS Limited | Information & communication | 2020 |
| Digitransformer Ltd | Information & communication | 2020 |
| Dignified Hair Design Limited | Other services | 2026 |
| Dignity Care UK Limited | Health & social care | 2006 |
| Dipak Foods Limited | Manufacturing | 1997 |
| Dipem Tanks Ltd | Administrative & support | 2025 |
| DISPENSE4ME Limited | Wholesale & retail | 2004 |
| Distrosys Ltd | Wholesale & retail | 2018 |
| DJ Consultancy (Leicester) Ltd | Professional & scientific | 2007 |
| DKR Events Ltd | Hospitality | 2022 |
| DM Drywall Ltd | Construction | 2002 |
| DME Services Ltd | Construction | 2025 |
| DN2A Investments Ltd | Real estate | 2020 |
| DNC Holdings Limited | Professional & scientific | 2016 |
| Docplan Limited | Real estate | 2002 |
| Dolphin A1 Group Ltd | Administrative & support | 2020 |
| Dolphin Baltic LLP | | 2020 |
| Dolphin Czechia and Slovakia LLP | | 2020 |
| Dolphin Europe LLP | | 2010 |