| Cairn Diamonds Limited | London | 2023 |
| Cairn Dynamics Ltd | London | 2024 |
| Cairn Labels Limited | Livingston | 2025 |
| Cairn O'Mohr Ltd. | Perth | 2002 |
| Cairn Precision Ltd | Peterhead | 2025 |
| Cairn Research Limited | Faversham | 1985 |
| Cairnbrook Tyre Services Limited | Bishopbriggs | 2016 |
| Cairndow Mechanical Services Limited | Cairndow | 2007 |
| Cairneous Ltd | Failsworth | 2023 |
| Cairney Cycles Ltd | Wishaw | 2025 |
| Cairngorm Bioheat Ltd | Aviemore | 2014 |
| Cairngorm Coffee Roasters Ltd | Edinburgh | 2021 |
| Cairngorm GIN Company Ltd | Aviemore | 2019 |
| Cairngorm Leaf and Bean Ltd | Boat Of Garten | 2018 |
| Cairngorms Glamping Limited | Aberdeenshire | 2017 |
| Cairnhill Framing Systems Limited | Coatbridge | 2007 |
| Cairnhill Structures (UK) Ltd | Bristol | 2018 |
| Cairnhill Structures Limited | Lanarkshire | 1980 |
| Cairnlin Enterprises Ltd | Grangemouth | 2012 |
| Cairns Associates Limited | Weston-Super-Mare | 2015 |
| Cairnsy.Co Ltd | London | 2023 |
| Cairoo Coffee Ltd | Letchworth Garden City | 2018 |
| Caistor Seafoods Limited | London | 2000 |
| Caiszn Ltd | London | 2026 |
| Caitamy Limited | Accrington | 2026 |
| Caithness Biotechnologies Limited | Leicester | 2015 |
| Caithness Biscuits Limited | Inverness | 2016 |
| Caithness Chemicals (Wick) Limited | Wick | 2012 |
| Caithness Creels Limited | Glasgow | 1991 |
| Caithness Embroidery & Clothing Printing Ltd | Thurso | 2026 |
| Caithness Marine Ltd | Golspie | 2025 |
| Caithness Ventilation Services Ltd | Thurso | 2019 |
| CAJ Composites Ltd | Norwich | 2021 |
| CAJ Media Ltd | East Malling | 2019 |
| Cajero Limited | Queenborough | 2004 |
| Cajh Limited | Liverpool | 2023 |
| Cajole Ltd | Leicester | 2026 |
| Cajunel Ltd | Gosport | 2021 |
| Cake & 50 Percent Sweet Ltd | Sheffield | 2022 |
| Cake & Bake Club Limited | Maidenhead | 2024 |
| Cake & Chocolate Factory Ltd | Cranleigh | 2024 |
| Cake 0 Emission Limited | Ashby-De-La-Zouch | 2021 |
| Cake and ALL Ltd | Bellshill | 2019 |
| Cake and Bake (by SAM) Ltd | Burntwood | 2023 |
| Cake and Bake Limited | Hemel Hempstead | 2021 |
| Cake and Beyond Limited | Reading | 2025 |
| Cake at 64 the Bake Shed Limited | Ipswich | 2025 |
| Cake Bake Station Ltd | Ilford | 2026 |
| Cake Bakery Ltd | Huddersfield | 2017 |
| Cake Bakes Glasgow Limited | Paisley | 2024 |
| Cake Basquet Ltd | London | 2026 |
| Cake Bay Ltd | Herne Bay | 2024 |
| Cake Blading Ltd | Sheffield | 2023 |
| Cake Blossom Ltd | Ilford | 2020 |
| Cake Box Holdings PLC | Enfield | 2013 |
| Cake Box Ltd | Metheringham | 2025 |
| Cake by Slice Ltd | Romford | 2025 |
| Cake by Sweetman Ltd | London | 2021 |
| Cake Castle Limited | Rochdale | 2022 |
| Cake Day Ltd | Warwick | 2023 |
| Cake Dealer Ltd | Southsea | 2025 |
| Cake Decor Ltd | Cumbernauld | 2006 |
| Cake Decore Limited | Northampton | 2015 |
| Cake Delusions BDS Limited | Cardiff | 2015 |
| Cake DOT World Ltd | Hatfield | 2018 |
| Cake Drinks Ltd | London | 2024 |
| Cake Envy Ltd | Wolverhampton | 2025 |
| Cake Factory Limited | West Bromwich | 2019 |
| Cake Fairy Heaven Limited | Harrow | 2020 |
| Cake Fairy Yorkshire Ltd. | York | 2018 |
| Cake G Ltd | Sowerby Bridge | 2023 |
| Cake Gallery Hale Limited | Altrincham | 2010 |
| Cake Glory Ltd | Hayes | 2022 |
| Cake Haven Ltd | Dunstable | 2018 |
| Cake House Leicester Ltd | Leicester | 2020 |
| Cake Hub Ltd | Rochdale | 2025 |
| Cake in a JAR Ltd | London | 2021 |
| Cake in a TIN Limited | Antrim | 2020 |
| Cake in House Ltd | Uxbridge | 2024 |
| Cake Industries Ltd | Hampton Hill | 2009 |
| Cake Inn Longsight Ltd | Manchester | 2024 |
| Cake Inn West Bromwich Limited | West Bromwich | 2021 |
| Cake IT TIL YOU Make IT Ltd | Wokingham | 2024 |
| Cake Kitchen by Tina Ltd | Milton Keynes | 2025 |
| Cake Ladoo Ltd | Tipton | 2021 |
| Cake Layers Limited | Tipton | 2018 |
| Cake Levels Ltd | London | 2023 |
| Cake Lovers Ltd | London | 2012 |
| Cake Make Create With LIZ Limited | Egham | 2023 |
| Cake Make Ltd | London | 2025 |
| Cake Mechanic Ltd | Redditch | 2018 |
| Cake Mistress Ltd | Thames Ditton | 2019 |
| Cake O NUT Ltd | Leeds | 2026 |
| Cake O'Licious Limited | Luton | 2011 |
| Cake Paradise Ltd | London | 2025 |
| Cake Secret Limited | Newport Pagnell | 2022 |
| Cake Shine Creations Ltd | Grays | 2026 |
| Cake Shop Coventry Limited | Coventry | 2024 |
| Cake Shop Franchise Ltd | Oldbury | 2016 |
| Cake Shop T/A Eggless Cake Shop Coventry Ltd | Coventry | 2016 |