| Orange Forestry Limited | Pontypridd | 2002 |
| Orange Plant Cannock Ltd | Cannock | 2021 |
| Orange River Capital Limited | Cardiff | 2020 |
| Orange Tree Farm Ltd | Horsham | 2020 |
| Orange Trees Sicily Ltd | Edgware | 2017 |
| Orangutan ARB Ltd | Gateshead | 2020 |
| Orangutan Landscapes & Tree Services Ltd | Consett | 2023 |
| Orbel Agriculture Limited | Stone | 2021 |
| Orbis Bloodstock Ltd | Newmarket | 2023 |
| Orbit Bloodstock Limited | Gloucester | 2019 |
| Orbitbiotech Limited | London | 2025 |
| Orca Charters Ltd | Christchurch | 2026 |
| Orca Fishing Company Limited | Newton Stewart | 2018 |
| Orcadis Limited | Fraserburgh | 2009 |
| Orchard Barn Designs Ltd | Derby | 2022 |
| Orchard Barn Environmental Education Centre (Obee) Community Interest Company | Stowmarket | 2007 |
| Orchard Bloodstock Limited | Newmarket | 2012 |
| Orchard END Farm Ltd | Bedford | 2024 |
| Orchard Escapes Ltd | London | 2023 |
| Orchard Estates (Goathland) Limited | Whitby | 1996 |
| Orchard Farm Dowsdale Ltd | Ruislip | 2019 |
| Orchard Farm (Bucks) Ltd | High Wycombe | 2017 |
| Orchard Farm (Cotswolds) Limited | Salisbury | 2017 |
| Orchard Farm (Somerset) Ltd | Taunton | 2017 |
| Orchard Farm (Yorkshire) Ltd | Worksop | 2019 |
| Orchard Farm Devon Limited | Plymouth | 2024 |
| Orchard Farm Estates Limited | Blackburn | 2013 |
| Orchard Farm of Oxford Limited | Thame | 2023 |
| Orchard Farm Poultry Ltd | Derby | 2025 |
| Orchard Farm Property Limited | Cirencester | 2025 |
| Orchard Farm Services Limited | Feering | 2007 |
| Orchard Free Range Eggs Ltd | Loughgall | 2015 |
| Orchard Guardians C.I.C. | Gloucester | 2000 |
| Orchard Holdings Ltd. | Feering | 2001 |
| Orchard House ( PIG Management and Trading ) Ltd | Driffield | 2017 |
| Orchard House (Driffield) Consulting Limited | Driffield | 2012 |
| Orchard Land Trust Limited | Liskeard | 2005 |
| Orchard Link Limited | Modbury | 1998 |
| Orchard Mushrooms Ltd | Co Armagh | 2006 |
| Orchard Organics (NI) Limited | Armagh | 2001 |
| Orchard Place Bloodstock Limited | Newmarket | 2025 |
| Orchard Place Farm Fishing Lakes Ltd. | Tonbridge | 2009 |
| Orchard Rise Agriculture Limited | Camberley | 2017 |
| Orchard Sage Agricultural Ltd | Hereford | 2025 |
| Orchard Store and Services (1950) Ltd | Sleaford | 2018 |
| Orchard Tree Surgery Ltd | Carlisle | 2018 |
| Orchard View Kent Ltd | Tonbridge | 2026 |
| Orchard Views Nickle Farm Ltd | Canterbury | 2016 |
| Orchard Vision Limited | Ashley Sutton Dover | 1999 |
| Orchid Aromatech Ltd | Newmarket | 2021 |
| Orchid Lakes Ltd | Edgware | 2024 |
| Orchid Willows Ltd | Bude | 2009 |
| Orchids by Celia Ltd | Bath | 2024 |
| Orchidsandbeyond Ltd | Shrewsbury | 2024 |
| Orcop Treetops Limited | Hereford | 2021 |
| ORD Stables Ltd | Muir Of Ord | 2021 |
| Orde Estate Ltd | Ross-On-Wye | 2014 |
| Ordens Farms Limited | Grampian | 1964 |
| Ordhill Farms Limited | Elgin | 2010 |
| Oren Tree Surgeons Ltd | Brecon | 2023 |
| Oreton Securities | The Lace Market | 1974 |
| Orffa UK Limited | Stoke On Trent | 1984 |
| Orga Products Limited | Stratford-Upon-Avon | 2000 |
| Organic Arable Marketing Company Limited | Steyning | 1999 |
| Organic CBD Ltd | Milton Keynes | 2025 |
| Organic Countryside Community Interest Company | Saffron Walden | 2009 |
| Organic DAN Limited | Ormskirk | 2003 |
| Organic Energy Farm Ltd | Ferndale | 2025 |
| Organic Families Ltd | London | 2025 |
| Organic Fresh Fruits Limited | Belvedere | 2025 |
| Organic Goods Ltd | London | 2021 |
| Organic Growers Alliance CIC | Pershore | 2018 |
| Organic Integrated Farms UK Ltd | Purley | 2021 |
| Organic Nurseries Ferriby Ltd | North Ferriby | 2023 |
| Organic Orchards Limited | Saffron Walden | 2014 |
| Organic Resource Agency Ltd. | Shrewsbury | 1996 |
| Organic Sea Harvest Limited | Inverness | 2015 |
| Organiccbd.Earth Ltd | Nuneaton | 2020 |
| Organiclea C.I.C. | London | 2004 |
| Organics Cycles Ltd | London | 2025 |
| Organicure Ltd | London | 2026 |
| Organisation Mvuala Motoko Alidor Ltd | Brentford | 2018 |
| Origin Amenity Limited | Royston | 2011 |
| Origin Enterprises Digital Limited | Didcot | 2013 |
| Origin Genetics Ltd | Ballymena | 2020 |
| Origin Greens Ltd | Newcastle Upon Tyne | 2025 |
| Origin Training Project Limited | Andover | 2011 |
| Original Mushroom Company Limited | Horsham | 2020 |
| Original Organic Exports Ltd | West Drayton , Harmondsworth | 2025 |
| Orimah Ltd | Ballymoney | 2026 |
| Orion Aquatics Ltd | London | 2025 |
| Orion Field Sports Ltd | Ayr | 2019 |
| Orion Fishing Company Ltd. | Cawdor | 2005 |
| Orion Marine Limited | Garve | 2012 |
| Orion Pollinators Ltd | Tharston | 2023 |
| Orissor Trust Ltd. | Rothesay | 2008 |
| Orkney Agricultural Society | Orkney | 2004 |
| Orkney Bere Ltd | Birsay | 2024 |
| Orkney CBD Ltd. | Kirkwall | 2024 |
| Orkney Dived Scallops Ltd | St. Margaret'S Hope | 2013 |