| Calder Valley Properties Ltd | Real estate | 2024 |
| Calder Wood Joinery Ltd | Manufacturing | 2016 |
| Calderdale Cleaners Ltd | Administrative & support | 2024 |
| Calicoheart Ltd | Transport & logistics | 2019 |
| Calluna Clothing Ltd | Wholesale & retail | 2022 |
| Camicapersca Ltd | Wholesale & retail | 2020 |
| Canal Bridge Developments Limited | Construction | 2021 |
| Canal Wharf (Todmorden) Management Company Limited | Households | 2025 |
| Car Perfect Limited | Professional & scientific | 2000 |
| Cargo Recording Studios Ltd | Extraterritorial | 2016 |
| Cargo Studios Ltd | Extraterritorial | 2014 |
| Carl Earnshaw Sales Ltd | Professional & scientific | 2023 |
| Carl Earnshaw Sales Solutions Limited | Professional & scientific | 2017 |
| Carter Finance Consultancy Ltd | Professional & scientific | 2019 |
| Carter Homes NW Ltd | Real estate | 2025 |
| Carter-Phoenix Ltd | Manufacturing | 2022 |
| Cashew Lettings Ltd | Real estate | 2024 |
| Castle Hill Private Day Nursery Limited | Health & social care | 2013 |
| CB Alpha Limited | Information & communication | 2024 |
| CC Digital Solutions Ltd | Professional & scientific | 2024 |
| Centre for Folklore Myth and Magic CIC | Arts & recreation | 2019 |
| Centrefrost Ltd | Wholesale & retail | 2019 |
| Changingcenter Ltd | Administrative & support | 2019 |
| Chasirblanco Ltd | Transport & logistics | 2019 |
| Chris Foster Photography Ltd | Other services | 2014 |
| Chris Graham Developments Limited | Construction | 2004 |
| Chris Milton Consulting Ltd | Information & communication | 2002 |
| Cinderhaven Ltd | Administrative & support | 2019 |
| Cinderhill Spinning Company Limited(The) | Manufacturing | 1959 |
| Cinematic Visions Limited | Information & communication | 2025 |
| Circulabs Ltd | Manufacturing | 2015 |
| Cirqfix Electrical Ltd | Construction | 2026 |
| Cito Electrical Installations Limited | Construction | 2010 |
| CJL Civils Ltd | Construction | 2020 |
| Clewer Place (a Block) Flat Management Company Limited | Real estate | 2025 |
| Clewer Place Flat Management Company Limited | Hospitality | 2004 |
| Clubley Design Ltd | Professional & scientific | 2023 |
| Cnktdm Limited | Hospitality | 2025 |
| Coetsee Media Limited | Information & communication | 2023 |
| Coffeepot Digital Limited | Administrative & support | 2013 |
| Colden Water Limited | Hospitality | 2016 |
| Collaborative Commons LAB Ltd | Professional & scientific | 2014 |
| Comfort Heating & Plumbing Services Ltd | Construction | 2015 |
| Comms & Controls Ltd | Other services | 2024 |
| Compliance Matters Limited | Professional & scientific | 2001 |
| CONNECT4U Ltd C.I.C. | Other services | 2018 |
| Connective Arts Ltd | Information & communication | 2010 |
| Copperas Consultancy Limited | Other services | 2011 |
| Cornholme Grocers Ltd | Wholesale & retail | 2023 |
| Corylush Ltd | Wholesale & retail | 2020 |
| Counterpoint Musical Services Limited | Arts & recreation | 2003 |
| Coverdent Ltd | Administrative & support | 2026 |
| Craig Newell Inspection Services Limited | Professional & scientific | 2024 |
| Crazy P Productions Limited | Arts & recreation | 2026 |
| Creating Space Art Therapy Co-Operative Limited | Health & social care | 2025 |
| Creationscovert Ltd | Manufacturing | 2026 |
| Creative Care Todmorden Ltd | Manufacturing | 2003 |
| Creative Digital Print Limited | Manufacturing | 2006 |
| Creative Heights Limited | Arts & recreation | 2019 |
| Creative With Nature Ltd | Agriculture & fishing | 2020 |
| Croftlea Developments Ltd | Administrative & support | 2018 |
| Cropley House Management Company Limited | Households | 2014 |
| Cross Farm Retreat Ltd | Hospitality | 2021 |
| Crowther Surveys Limited | Administrative & support | 2011 |
| CS Language Services Limited | Administrative & support | 2014 |
| Cuanix Ltd | Wholesale & retail | 2020 |
| Cycle Factory Ltd | Wholesale & retail | 2022 |
| Cymbelstone Consultancy Limited | Other services | 2016 |
| D & a Control Solutions Limited | Construction | 2015 |
| D K P Accountants Limited | Professional & scientific | 2008 |
| D Murphy Electrical Ltd | Construction | 2016 |
| D S Howley Joinery Ltd | Construction | 2024 |
| D-C Agriculture & Industrial Building Contractors Ltd | Construction | 2023 |
| D. Mills & Co. (Spring Makers) Limited | Manufacturing | 1999 |
| Dabalila Ltd | Construction | 2014 |
| Dalladex Ltd | Information & communication | 2017 |
| Danielle Moore Kindness Ltd | Arts & recreation | 2025 |
| Darcy & Darcy Ltd | Households | 2025 |
| Dart Deliveries Ltd | Transport & logistics | 2025 |
| Dawson-Rodgers & Company Limited | Manufacturing | 1933 |
| DB Property Renovations Ltd | Real estate | 2025 |
| Deanroyd Trading Company Limited | Financial services | 2014 |
| Deep Tech Education Ltd | Education | 2026 |
| Dennis Cullinane Plastering Contractors Limited | Construction | 2011 |
| Dennis Hoyle Kitchen Installations Limited | Construction | 2008 |
| DG Football Coaching Ltd | Arts & recreation | 2019 |
| DIM Sun Ltd | Information & communication | 2022 |
| Disco Doggo Ltd | Wholesale & retail | 2023 |
| Disruptive Focus Ltd | Professional & scientific | 2020 |
| Distancelearningcentre.Com Ltd | Education | 2003 |
| DK Minibuses Ltd | Administrative & support | 2008 |
| Dllb Properties Ltd | Real estate | 2024 |
| DMR Limited | Real estate | 2022 |
| Dogood-Digital Limited | Professional & scientific | 2022 |
| Drizzle City Bakes Ltd | Manufacturing | 2021 |
| DS Design Studio Limited | Professional & scientific | 2008 |
| Duke Street Food Ltd | Hospitality | 2019 |
| Duniya Media Services Ltd | Other services | 2017 |
| Dwell Time TV Productions Limited | Information & communication | 2021 |
| E Howarth Properties Ltd | Real estate | 2024 |