| A.I.Walgate & SON | Agriculture & fishing | 1954 |
| A.I.Walgate & SON (Holdings) Limited | Financial services | 2016 |
| A.J. Curtis Limited | Information & communication | 2006 |
| Abacol Limited | | 1987 |
| Aces High Collectables Ltd | Wholesale & retail | 2004 |
| Adam Frost Design Limited | Administrative & support | 2005 |
| Admiral Display Limited | Manufacturing | 2002 |
| Adventist Book Centre (South) Limited | Wholesale & retail | 1974 |
| Adventist Book Centre Limited | Wholesale & retail | 1974 |
| Aegir Consumer Electronics Limited | Wholesale & retail | 1982 |
| Airplane Limited | Transport & logistics | 2004 |
| Aisby Haulage & Plant Limited | Transport & logistics | 1978 |
| AJM Fire Solutions Ltd | Administrative & support | 2006 |
| Alisons Limited | Wholesale & retail | 1990 |
| Amarna Ltd | Information & communication | 1996 |
| Ambatec Limited | Professional & scientific | 2003 |
| American Circus Limited | | 1985 |
| Andrew Mcdonnell Associates Limited | Real estate | 2002 |
| Angloflora (Holdings) Limited | Financial services | 1990 |
| Angloflora Farms Limited | Agriculture & fishing | 1979 |
| Arthur Syddall (Grantham) Limited | Wholesale & retail | 1938 |
| Autumn House Publications (Europe) Limited | Manufacturing | 1991 |
| Aztec Cleaning Contracts Limited | Administrative & support | 2009 |
| Azure Consultants Limited | Professional & scientific | 2007 |
| B.A.Bush & SON Limited | Wholesale & retail | 1970 |
| Bates Environmental Limited | Water & waste | 2002 |
| Baxter's Book-Keeping Services Limited | Professional & scientific | 2002 |
| Bentleys Holiday Homes Limited | Hospitality | 2023 |
| Beta (Lincoln) Ltd. | Professional & scientific | 1988 |
| Betterworld Limited | Other services | 1997 |
| Bigmazza Ltd | Financial services | 2008 |
| Blackfriars Arts Centre Limited | Arts & recreation | 1961 |
| Boston Bowl Limited | Arts & recreation | 1993 |
| Boston Bowling Club Limited(The) | Arts & recreation | 1923 |
| Boston Indoor Bowling Limited | Arts & recreation | 1983 |
| Boston Masonic Hall and Club Limited | Other services | 1961 |
| Bourne Translating & Editing Limited | Professional & scientific | 2007 |
| Bovington Refrigeration Limited | Administrative & support | 2002 |
| Bowd Farming Company Limited | Agriculture & fishing | 2002 |
| Brooks (Spalding) Limited | Administrative & support | 2004 |
| BSK Haulage Limited | Transport & logistics | 2007 |
| C H Stennett Limited | Wholesale & retail | 2005 |
| C. D. Parsley (Caterers) Limited | Professional & scientific | 1951 |
| Cammack & Sons,Limited | Wholesale & retail | 1947 |
| Caravan Park Electrical Services Limited | Manufacturing | 1981 |
| Chris Vickers Refrigeration Ltd | Manufacturing | 2006 |
| Colin Bell Menswear Limited | Wholesale & retail | 1988 |
| Colin Gregory Roses Limited | Agriculture & fishing | 2003 |
| Constructive Coding Ltd | Information & communication | 2009 |
| Coston Limited | | 1983 |
| Country Herbs and Plants Limited | Administrative & support | 2003 |
| Courier Express (Boston) Limited | Transport & logistics | 2005 |
| D & B Properties (Boston) Limited | Real estate | 1988 |
| D.A. Whitt Sales & Marketing Ltd | Wholesale & retail | 2006 |
| D.C. Architectural Services Limited | Professional & scientific | 2007 |
| Darrenmwilson Ltd | Information & communication | 2007 |
| Databridgemis Limited | Information & communication | 2000 |
| David Newsam Limited | Real estate | 2005 |
| Dobney Developments Limited | Construction | 2005 |
| E.J. Aldrich Limited | | 1980 |
| Edge Fold Poultry Handlers Limited | | 1986 |
| Edward Coward Limited | Agriculture & fishing | 1941 |
| Edwin E. Hare & Co. (Seeds) Limited | Real estate | 1970 |
| Elite Decor (Grantham) Limited | Construction | 2004 |
| Empingham Construction Limited | | 1985 |
| Enchantment Homes Limited | Construction | 2005 |
| Eventum Coaching and Change Ltd | Education | 2003 |
| Fair Electrical Limited | | 1987 |
| Feldbinder (UK) Limited | Manufacturing | 1938 |
| Fenland Laundries Limited | Other services | 1980 |
| Flintalton | | 1984 |
| Fred W Read & Sons Limited | Agriculture & fishing | 1955 |
| G5 ERP Limited | Professional & scientific | 2006 |
| Gainsborough Trinity Football Club Limited | Arts & recreation | 1971 |
| Galagold Limited | Administrative & support | 1988 |
| Gatehouse Business Services Limited | Professional & scientific | 2004 |
| Gateway Electronics Limited | Administrative & support | 2005 |
| Georgian Homes Limited | Real estate | 2005 |
| Grantham and District Indoor Bowling Club Limited | Arts & recreation | 1982 |
| Grantham Engineering Ltd. | Manufacturing | 1946 |
| H.C.C.Tinsley & SON Limited | Agriculture & fishing | 1958 |
| H.H.Adkins(Contractors)Limited | Construction | 1958 |
| Harrowby Lodge Nursing Home Limited | Health & social care | 2003 |
| Haydn Wesley & SON Ltd | Agriculture & fishing | 2005 |
| Helprange Limited | | 1986 |
| Henry Bell & Co (Grain Merchants) Limited | Extraterritorial | 1933 |
| Henry Bell & Co (Properties) Limited | Real estate | 1979 |
| Heritage Refurbishment (Bourne) Limited | Wholesale & retail | 2004 |
| Hhes Limited | Wholesale & retail | 1975 |
| House of Natural Food Limited | Wholesale & retail | 1987 |
| IAN Hornsby Limited | Wholesale & retail | 2003 |
| Icerush Ltd | Education | 2005 |
| International Fashion Collections Limited | | 1990 |
| John Fowler (Builders) Ltd | Construction | 2007 |
| John H. Rundle Limited | Manufacturing | 1965 |
| John Selby (Kirton Lindsey) Limited | Agriculture & fishing | 1965 |
| Jonaso Limited | Construction | 2015 |
| Joseph Nickerson Ltd | Agriculture & fishing | 1972 |
| K Burton & SON Limited | Financial services | 2005 |
| K.D. Enderby (Alford) Limited | Construction | 2005 |