| Howard Housing Limited | Real estate | 2021 |
| Howard Property Partners Ltd | Real estate | 2025 |
| Howe Suspended Ceilings Ltd | Construction | 2022 |
| HSG Transport Ltd | Transport & logistics | 2026 |
| Hudson Motors Ltd | Wholesale & retail | 2008 |
| Hughbenjamin Limited | Construction | 2008 |
| Hughes Maintenance Ltd | Other services | 2022 |
| Hull Holdings Limited | Financial services | 2016 |
| Hyprotect Holdings Limited | Financial services | 2026 |
| Hyprotect Limited | Manufacturing | 1987 |
| I T Dennis Limited | Agriculture & fishing | 2003 |
| I-Bolt Limited | Professional & scientific | 2014 |
| ICB Asset Management Ltd | Professional & scientific | 2005 |
| ICB Design & Engineering Limited | Construction | 1996 |
| Icontact Branding Ltd | Wholesale & retail | 2019 |
| ICV Properties Ltd | Real estate | 2019 |
| IDA Lily Ltd | Wholesale & retail | 2025 |
| Impact (Boston) Holdings Limited | Financial services | 2024 |
| Indoor Retail Properties Limited | Real estate | 2020 |
| Indulgence Skegness Ltd | Hospitality | 2015 |
| Inform Health Limited | Information & communication | 2010 |
| Ings Farm Eggs Limited | Agriculture & fishing | 2008 |
| Insulate Window Systems Limited | Construction | 2026 |
| Integrative Balance Ltd | Wholesale & retail | 2020 |
| Intro-Tec Ltd | Administrative & support | 2022 |
| Intro-Tech Recruitment Ltd | Administrative & support | 2021 |
| Invicta Fire and Safety Limited | Professional & scientific | 2012 |
| IP Block Ltd | Information & communication | 2026 |
| Istanbul Barber Skegness Limited | Other services | 2019 |
| IT Warranty Services Ltd | Information & communication | 2020 |
| Italian Aroma Restaurant Ltd | Hospitality | 2023 |
| J & D Haworth Limited | Agriculture & fishing | 2012 |
| J & G Mortgages Limited | Financial services | 2003 |
| J & S Shipping & Trading Limited | Transport & logistics | 2011 |
| J E M (Lincs) Ltd | Hospitality | 2011 |
| J E M Group Lincs Limited | Financial services | 2023 |
| J E M Investments (Lincs) Ltd | Real estate | 2011 |
| J E Spence & SON Farms Ltd | Agriculture & fishing | 2012 |
| J Etches Groundworks Aggregates Ltd | Construction | 2025 |
| J F Rowson & Sons (Farmers) Limited | Agriculture & fishing | 1966 |
| J&C Online Trading Ltd | Wholesale & retail | 2024 |
| J&C Traders Ltd | Wholesale & retail | 2024 |
| J&H Simpkins Limited | Transport & logistics | 2016 |
| J. Tonglet Catering Co. Limited | Real estate | 1952 |
| J.A.Robertson Ltd | Administrative & support | 2019 |
| J.B. Taylor Construction Limited | Construction | 1997 |
| J.E. Spence & SON Limited | Construction | 2000 |
| J.E. White (Property) Limited | Real estate | 2001 |
| J.F. Packaging Ltd | Administrative & support | 2004 |
| Jace Leisure Ltd | Professional & scientific | 2019 |
| Jace Property Rentals Ltd | Real estate | 2022 |
| Jack's Community Soccer School CIC | Arts & recreation | 2026 |
| James Arnold IT Solutions Limited | Information & communication | 2022 |
| Jason Lowes (Building) Ltd | Construction | 2006 |
| JB Construction Skegness Ltd | Construction | 2026 |
| JB Leisure (Lincs) Limited | Hospitality | 2010 |
| Jbourne Ltd | Transport & logistics | 2025 |
| Jdsw Trading Ltd | Wholesale & retail | 2026 |
| JEM Commercial Ltd | Real estate | 2014 |
| Jeric Homes Ltd | Construction | 2021 |
| JIT Consumables Limited | Wholesale & retail | 2013 |
| JJ Fade Media Ltd | Professional & scientific | 2026 |
| JJM Flooring Ltd | Construction | 2019 |
| JL Parks Ltd | Hospitality | 2025 |
| JLA Taxis Ltd | Transport & logistics | 2012 |
| Jlgcp Ltd | Financial services | 2025 |
| JOE Carter Ltd | Agriculture & fishing | 2002 |
| John Lacey and SON Limited | Construction | 2014 |
| John Ling & SON Limited | Administrative & support | 1986 |
| JON Carr Consultancy Limited | Professional & scientific | 2025 |
| JRH Telecommunications Ltd | Wholesale & retail | 2018 |
| JRP Leisure Limited | Administrative & support | 2008 |
| JSF Cooperation Ltd | Transport & logistics | 2021 |
| Jude Property Rentals Limited | Extraterritorial | 2023 |
| Jump Warriors Limited | Arts & recreation | 2017 |
| Junaid Grill and Go Ltd | Hospitality | 2026 |
| JV Skegness Ltd | Wholesale & retail | 2025 |
| K Chamberlain & SON Ltd | Agriculture & fishing | 2013 |
| K-Net Construction Limited | Construction | 2006 |
| K.L.H. Holdings Limited | Professional & scientific | 1963 |
| K.L.H. Leisure Limited | Hospitality | 1999 |
| Kaizen Event Safety Management Ltd | Administrative & support | 2025 |
| KAL Ceilings Ltd | Construction | 2026 |
| KAL Finishes Ltd | Construction | 2017 |
| Kalm Property Ltd | Real estate | 2017 |
| Kalm Topco Limited | Financial services | 2026 |
| Kartworld Extreme Leisure Ltd | Arts & recreation | 2023 |
| Katherine Mowbray Accountants Limited | Professional & scientific | 2010 |
| Kdbi Limited | Professional & scientific | 2024 |
| Kdwp Limited | Real estate | 2020 |
| Keal Productions Limited | Information & communication | 2023 |
| Keaton Close Management Limited | Households | 2023 |
| Kebab Specialists Limited | Wholesale & retail | 2007 |
| Keith MAY Accounting Services Ltd | Professional & scientific | 2021 |
| Kelsey Wood Country Park Ltd | Hospitality | 2016 |
| Kennyksd Limited | Information & communication | 2025 |
| Khan's Grill & Balti Limited | Hospitality | 2022 |
| Kime Holdings Ltd | Real estate | 2026 |
| Kimmy's Bakery Limited | Wholesale & retail | 2023 |
| KK Parade Cafe Ltd | Hospitality | 2025 |