| Boulevard Care Limited | Health & social care | 2011 |
| Bourne Snooker Centre Limited | Arts & recreation | 2007 |
| Braethorn Limited | Professional & scientific | 1997 |
| Brayford Studio Limited | Health & social care | 2005 |
| Brendon Chemical Company Limited | Financial services | 1955 |
| Breydon Construction Limited | Construction | 1973 |
| Brian Ayres Roofing Supplies Limited | Wholesale & retail | 2008 |
| Bridge Farm Bioscience Limited | Administrative & support | 2001 |
| Britannia Kitchen Ventilation Limited | Manufacturing | 1995 |
| Britmen Travel Service Limited | Administrative & support | 1963 |
| Broker Options (UK) LLP | | 2004 |
| Brook & Mayo Limited | Construction | 2002 |
| Bryan Thompson Plumbing & Heating Limited | Construction | 2004 |
| Bryan Thompson Windows Limited | Construction | 2006 |
| Buckley's of Manchester (Holdings) Limited | Real estate | 2001 |
| Buckley`S Commercial Services Limited | Wholesale & retail | 2006 |
| Bullet Engineering Limited | Manufacturing | 1996 |
| BUN Limited | Hospitality | 1997 |
| Burdetts Automotive Limited | Wholesale & retail | 2005 |
| Burrough Court Estate Limited | Agriculture & fishing | 1944 |
| Burtts of Dowsby Limited | Agriculture & fishing | 1942 |
| Buzy Brainz Konzult Ltd | Public administration | 2023 |
| Bycrofts of Boston Limited | Wholesale & retail | 2005 |
| C & S Strategic Solutions Limited | Real estate | 2005 |
| C F Middleton Limited | Agriculture & fishing | 2008 |
| C H & D Bland Limited | Administrative & support | 2005 |
| C J and G Hinkins Limited | Information & communication | 2004 |
| C W Tomkins Limited | Wholesale & retail | 2007 |
| C. Slooten Limited | Agriculture & fishing | 1950 |
| C0MPRESMATT Limited | Health & social care | 2022 |
| Caistor Equestrian Centre Ltd | Arts & recreation | 2007 |
| Calandine Lifts Limited | Manufacturing | 2005 |
| Carpe Diem Properties Limited | Construction | 2004 |
| Castlegate Financial Management Limited | Financial services | 1986 |
| Castlegate Pension Administration Limited | Financial services | 2001 |
| Castlegate Trustees Limited | Professional & scientific | 2002 |
| Castlet Limited | Manufacturing | 1999 |
| Cath-Tech International Limited | Professional & scientific | 2002 |
| Cemconsult Ltd. | Construction | 2006 |
| Central Chambers (Boston) Limited | Real estate | 1981 |
| Chandlers (Farm Equipment) Limited | Wholesale & retail | 1982 |
| Chandlers of Grantham | Professional & scientific | 1944 |
| Chanelle Jaye Entertainment Agency Limited | Arts & recreation | 2004 |
| Chapel Recording Studios Limited | Professional & scientific | 2007 |
| Chappell & Co. Surveyors Limited | Other services | 2006 |
| Charam Limited | Real estate | 2003 |
| Charis Consultancy Ltd | Professional & scientific | 2001 |
| Charles H Hill Limited | Wholesale & retail | 2002 |
| Chartcrest Enterprises Limited | Hospitality | 1995 |
| Chefbox Recruitment 24/7 Ltd | Hospitality | 2026 |
| Church Tower Homes Limited | Construction | 2005 |
| Clean-My-Windows Limited | Other services | 2007 |
| Cliff Bradley & Sons Funeral Directors Limited | Other services | 1999 |
| Clover Dental Care Limited | Health & social care | 2007 |
| Cobb & Co Accountants Limited | Professional & scientific | 2008 |
| Colin Woods Motors Limited | Real estate | 1977 |
| Colonia of Bailgate Limited | Wholesale & retail | 2003 |
| Cottage Indian Ltd | Hospitality | 2019 |
| Cottonreal Limited | Wholesale & retail | 2006 |
| Countryside Art Limited | Professional & scientific | 2004 |
| CPD Training (UK) Limited | Education | 2005 |
| Crop Management Information Limited | Agriculture & fishing | 1986 |
| Crossroads (North Rauceby) Limited | Professional & scientific | 1952 |
| Crowson Motors Limited | Wholesale & retail | 1995 |
| Cunsamy Cooking Limited | Manufacturing | 2025 |
| Czxsg Ltd | Wholesale & retail | 2026 |
| D D Developments Louth Limited | Wholesale & retail | 2004 |
| D. Phillips Limited | Construction | 2003 |
| D.C. Taylor and SON Limited | Construction | 2003 |
| Dacalh Ltd | Construction | 2008 |
| Dalby Hall Farms | | 1993 |
| Damasco UK Limited | Manufacturing | 1998 |
| David Armstrong Farms Limited | Agriculture & fishing | 2003 |
| David Bowman Limited | Transport & logistics | 1996 |
| David Roark Landscapes Limited | Administrative & support | 2004 |
| David Wilson's Trailers Limited | Administrative & support | 1995 |
| Davies-Todd Opticians Limited | Health & social care | 1997 |
| DE Nickols & Sons Limited | Agriculture & fishing | 1955 |
| Delsicona Limited | Real estate | 2006 |
| Denby Transport Limited | Transport & logistics | 1961 |
| Denby Warehouse Limited | Extraterritorial | 1970 |
| Diamond Glazing (Lincs) Limited | Construction | 2006 |
| Diana Carter Salon Limited | Other services | 2000 |
| Dimar Transport Limited | Transport & logistics | 2006 |
| DJT International Limited | Information & communication | 2002 |
| DLS Medical Limited | Extraterritorial | 2006 |
| Dobbs Blind Makers Limited | Manufacturing | 2004 |
| Doddington Farms LLP | | 2007 |
| Dolu Catering Ltd | Hospitality | 2024 |
| Donhot Limited | Manufacturing | 1989 |
| Dotcom I.T. Services Limited | Information & communication | 1999 |
| Drury Precision Engineering Ltd | Manufacturing | 1996 |
| Duchy Farm Kennels Limited | Manufacturing | 2007 |
| Duke Properties Limited | Real estate | 2004 |
| Duncan & Toplis Audit Limited | Professional & scientific | 2002 |
| DWA Energy Limited | Professional & scientific | 2009 |
| Dynamic Cassette International Limited | Manufacturing | 1983 |
| Dynamica Limited | Manufacturing | 1987 |
| Dynamica Manufacturing Limited | Manufacturing | 1998 |
| Dynex Semiconductor Limited | Manufacturing | 1999 |