| Beelsby Properties Limited | Real estate | 2026 |
| Beer CAB Ltd | Hospitality | 2019 |
| Belle Heir Consultancy Limited | Professional & scientific | 2025 |
| BEN Energy Services Ltd | Construction | 2023 |
| BEN Gibbon Management Accounting Services Limited | Extraterritorial | 2013 |
| Benstar Fireworks Ltd | Wholesale & retail | 2017 |
| Bentley Developments (Lincs) Limited | Construction | 2018 |
| Bentons Developments Limited | Construction | 2006 |
| Best Developments Limited | Manufacturing | 2008 |
| Best in Line Ltd | Wholesale & retail | 2018 |
| Best of British Holdings Limited | Extraterritorial | 2016 |
| BEX Accounting Ltd | Professional & scientific | 2026 |
| Bexx Engineering (Hull) Limited | Professional & scientific | 2015 |
| Beyond Lincs Engineering Ltd | Manufacturing | 2022 |
| BG Smart Repair Limited | Wholesale & retail | 2026 |
| BGF Farming Ltd | Agriculture & fishing | 2022 |
| Big Bolt Engineering Limited | Wholesale & retail | 1987 |
| Big BOY Logistics Ltd | Transport & logistics | 2024 |
| Big Goose Marketing Ltd. | Professional & scientific | 2023 |
| Billy Willmington Ltd | Extraterritorial | 2024 |
| Binbrook Motors Limited | Administrative & support | 2003 |
| Biosecure Limited | Other services | 2014 |
| Birkinshaw Holdings Limited | Other services | 2024 |
| Bishop Norton Amenities Limited | Households | 2007 |
| Blake Andrew Homes Ltd | Real estate | 2024 |
| Blue Lily Music Ltd | Extraterritorial | 2021 |
| Bluebell Wold Farm Limited | Wholesale & retail | 2022 |
| Bluefin Holdings Limited | Arts & recreation | 2018 |
| Bluehawk Trading Ltd | Wholesale & retail | 2018 |
| Boccasion Limited | Wholesale & retail | 1999 |
| Boloo Ltd | Real estate | 2021 |
| Bostock Scaffolding Services Limited | Construction | 2015 |
| Boundary Estates Ltd | Transport & logistics | 2018 |
| BP Squared Ltd | Professional & scientific | 2024 |
| BPD Contracting Limited | Wholesale & retail | 2011 |
| Brad and Dunnstreet Limited | Extraterritorial | 2022 |
| Bread & JAM CIC | Education | 2024 |
| Bredd Properties Ltd | Real estate | 2022 |
| Brent Krude Ltd | Administrative & support | 2020 |
| Breukelen Ltd | Professional & scientific | 2025 |
| Brickwork Innovations Ltd | Construction | 2025 |
| Bridge House Electricals Limited | Construction | 2010 |
| Brightsolo Limited | Other services | 1983 |
| Brightwater Landscapes Ltd | Arts & recreation | 1998 |
| Brimstone Assets Ltd | Real estate | 2024 |
| Britannia Contractors Ltd | Construction | 2018 |
| Bronzed and Beauty Ltd | Other services | 2024 |
| Brookenby Park Farms Limited | Agriculture & fishing | 2015 |
| Brookstone Partners Ltd | Real estate | 2024 |
| Bullforge Labs Ltd | Information & communication | 2026 |
| Butchers Arms (North Kelsey) Limited | Hospitality | 1996 |
| C B Winney Ltd | Professional & scientific | 2023 |
| C H W Properties Ltd | Real estate | 2023 |
| C.W. Anyan (Farms) Limited | Agriculture & fishing | 1974 |
| C31 Limited | Professional & scientific | 2011 |
| Caddies Choice Coffee Ltd | Wholesale & retail | 2024 |
| Caddiescorner Ltd | Other services | 2025 |
| Cade Properties Ltd | Real estate | 2025 |
| Cadney CUM Howsham Village Hall and Park Committee | Arts & recreation | 2006 |
| Caenby Corner Garage Limited | Wholesale & retail | 1981 |
| Cagill Limited | Financial services | 2023 |
| Cagill Property Limited | Real estate | 2023 |
| Caistor Arts and Heritage Centre (Big) | Hospitality | 2010 |
| Caistor Arts and Heritage Charity | Arts & recreation | 2014 |
| Caistor Educational Tutoring Limited | Education | 2017 |
| Caistor Farm & Garden Machinery Limited | Wholesale & retail | 2017 |
| Caistor Grammar School | Education | 2010 |
| Caistor Mini Market 1 Ltd | Wholesale & retail | 2026 |
| Caistor Mini Market Ltd | Wholesale & retail | 2025 |
| Caistor Quad Adventure Limited | Arts & recreation | 2006 |
| Caistor Sports & Social Club CIC | Hospitality | 2020 |
| Caistor Yarborough Academy Limited | Education | 2011 |
| Cameron Rhodes Consulting Limited | Professional & scientific | 2020 |
| Canine Country Park Ltd | Other services | 2025 |
| Canine Country Retreat and Spa Ltd | Agriculture & fishing | 2025 |
| Card Personalisation Solutions Limited | Manufacturing | 2003 |
| Caribbean Bunch Limited | Education | 2021 |
| Carter & Miller Limited | Extraterritorial | 2026 |
| Cash-A-Blanca Limited | Professional & scientific | 2025 |
| Cassells Limited | Professional & scientific | 2003 |
| Cathodic Services Ltd | Professional & scientific | 2023 |
| CCH Cars Limited | Transport & logistics | 2025 |
| Celesta Limited | Arts & recreation | 2019 |
| Celspan Limited | Information & communication | 2013 |
| Cema Lighting Limited | Manufacturing | 2015 |
| Century Cars (Caistor) Ltd | Wholesale & retail | 2012 |
| Chad Consulting Limited | Administrative & support | 2009 |
| Challenger Engineering Ltd | Manufacturing | 2023 |
| Champions Flattrack School Ltd | Arts & recreation | 2025 |
| Chapelgate Plumbing + Heating Limited | Construction | 2023 |
| Chappell Bros. Groundworks Ltd | Construction | 2017 |
| Charlotte Victoria Elliott-Wright Ltd | Extraterritorial | 2024 |
| Cherry Tree Homes (Holdings) Limited | Financial services | 2023 |
| Cherry Tree Homes (UK) Limited | Construction | 1994 |
| Cherry Tree Land Investments LLP | | 2007 |
| Chestnut Investments (UK) Limited | Real estate | 2004 |
| Chestnut Management Consulting Ltd | Professional & scientific | 2016 |
| Chestnut Trading Limited | Wholesale & retail | 2005 |
| Church Mill Management Company Limited | Households | 1988 |
| Church Street Cafe Ltd | Hospitality | 2025 |