| A Touch of Enchantment Limited | Wholesale & retail | 2020 |
| AA (Scotland) Holdings Ltd | Financial services | 2024 |
| ABC Arran Training Limited | Health & social care | 2010 |
| Admin Plus Ltd | Administrative & support | 2019 |
| Adrian Cannon Construction Services Ltd | Construction | 2021 |
| Adsc ( Arran) Limited | Wholesale & retail | 2021 |
| Afta Interiors Ltd | Professional & scientific | 2024 |
| Airsource Arran Ltd | Construction | 2023 |
| Aiyaz Ahmed Ltd | Information & communication | 2012 |
| Allanacc Ltd | Professional & scientific | 2025 |
| Allsquare (UK) Ltd | Professional & scientific | 1995 |
| Andrew Perrie Electrician Ltd | Other services | 2019 |
| Andrews Mckenzie Prop Limited | Real estate | 2025 |
| Angus Lambie Motor Engineers Limited | Transport & logistics | 2004 |
| Arakin Limited | Real estate | 1977 |
| Ardlui Collective Limited | Hospitality | 2026 |
| Arran Accountancy Limited | Professional & scientific | 2019 |
| Arran Action Care Ltd | Health & social care | 2022 |
| Arran Active Ltd | Wholesale & retail | 2015 |
| Arran Aggregates Ltd. | Mining & quarrying | 1999 |
| Arran Alpacas Limited | Agriculture & fishing | 2020 |
| Arran Ayen LLP | | 2024 |
| Arran Brew Ltd. | Manufacturing | 1997 |
| Arran Brewery PLC | Manufacturing | 2012 |
| Arran Community and Voluntary Service | Administrative & support | 2011 |
| Arran Crofter Huts Ltd | Hospitality | 2025 |
| Arran Dairies (Glencoy) & Partners | | 1991 |
| Arran Dairies Limited | Manufacturing | 1978 |
| Arran Earthworx Ltd | Agriculture & fishing | 1987 |
| Arran Electrical & Refrigeration Ltd. | Construction | 2006 |
| Arran Energy Ltd. | Agriculture & fishing | 2008 |
| Arran Estate Agents Ltd. | Real estate | 2006 |
| Arran Footpaths and Forestry Ltd | Agriculture & fishing | 2017 |
| Arran Friendship Club CIC | Health & social care | 2025 |
| Arran Garage Services Ltd | Other services | 2017 |
| Arran GAS and Fuel Ltd | Wholesale & retail | 2024 |
| Arran Gourmet Tinned Seafood Delights Ltd | Manufacturing | 2026 |
| Arran Island Retreats Limited | Hospitality | 2025 |
| Arran Leisure Limited | Hospitality | 2020 |
| Arran Mushrooms Limited | Agriculture & fishing | 2023 |
| Arran Park Ltd | Hospitality | 2024 |
| Arran Photonic Technologies Ltd | Professional & scientific | 2025 |
| Arran Property Company Ltd | Real estate | 2025 |
| Arran Rainforest C.I.C. | Agriculture & fishing | 2025 |
| Arran Sleephuts Limited | Hospitality | 2017 |
| Arran Timber Ltd | Agriculture & fishing | 2024 |
| Arran Turkish Barber Limited | Other services | 2017 |
| Arran Vets Ltd | Professional & scientific | 2015 |
| Arran Wishes Ltd | Extraterritorial | 2023 |
| Arran Workboats Ltd | Manufacturing | 2018 |
| Arrandigital LLP | | 2007 |
| Auchrannie House Hotel Limited | Hospitality | 2025 |
| Auchrannie Leisure (Services) Limited | Hospitality | 1990 |
| Ballarie Designs Ltd | Wholesale & retail | 2019 |
| Ballarie Farm Partnership | | 1988 |
| Balmichael Events Limited | Arts & recreation | 2021 |
| Balmichael Glamping Limited | Hospitality | 2019 |
| Bannerfield Limited | Information & communication | 2012 |
| Beach Wave Property Ltd | Real estate | 2023 |
| Beers of the World Ltd | Professional & scientific | 2003 |
| BI6 Ltd. | Transport & logistics | 2003 |
| Billy Paterson Electrical Contracting Ltd | Construction | 2020 |
| Black Dog RUM Limited | Manufacturing | 2023 |
| Bourne Marine Consulting Ltd | Transport & logistics | 2014 |
| Braw Pieces Ltd | Hospitality | 2022 |
| Brodick Brasserie Limited | Hospitality | 2018 |
| Brodick Improvements Committee | Other services | 2008 |
| Bruadarach Holdings Ltd | Wholesale & retail | 2026 |
| Brucam Properties Ltd | Real estate | 2025 |
| Byker Bairns Ltd | Health & social care | 2023 |
| C M Weir & Sons Ltd. | Wholesale & retail | 2009 |
| C&I Peritia Ltd | Professional & scientific | 2017 |
| C&Lm Catering Limited | Hospitality | 2025 |
| Caffè Fiera Ltd. | Wholesale & retail | 2017 |
| Capella Maritime Limited | Professional & scientific | 2026 |
| CCL Property Services Limited | Administrative & support | 2020 |
| Chrissy's Laundry Arran Ltd | Other services | 2019 |
| CL MAC Technical Ltd | Professional & scientific | 2015 |
| Clachaig Candles Ltd | Manufacturing | 2023 |
| Cladach Beach House Limited | Wholesale & retail | 2023 |
| Cladach Developments Limited | Construction | 1997 |
| CLD Carbon Ltd | Professional & scientific | 2023 |
| Clydeside Electrics Ltd | Construction | 2026 |
| Collaborative Export Solutions Limited | Extraterritorial | 2017 |
| Community of Arran Seabed Trust Limited | Professional & scientific | 2006 |
| Corrie & Sannox Village Committee Limited | Other services | 2006 |
| Corrie Community Garden CIC | Agriculture & fishing | 2023 |
| Corriegills Cabin Ltd | Health & social care | 2025 |
| County Carpets (Arran) Limited | Wholesale & retail | 2003 |
| CW Ribbeck Engineering Services Ltd | Professional & scientific | 2021 |
| D Tapson (Glencloy) and Partner | | 1989 |
| Dagaz Construction Ltd | Construction | 2024 |
| Dernaneach Farm Partnership | | 1991 |
| Digital Blacksmith Limited | Information & communication | 2022 |
| Dlta Services Ltd | Professional & scientific | 2018 |
| Don-Craig Grant Limited | Construction | 2025 |
| Dotty Spider Property Ltd. | Real estate | 2018 |
| Dougarie Estate Limited | Agriculture & fishing | 2020 |
| Dougarie Holdings LLP | | 2023 |
| Dutch House Caravan Parks Limited | Professional & scientific | 1975 |