| Jt's Joie Ltd | Wholesale & retail | 2021 |
| JTA Blandford Limited | Hospitality | 2019 |
| JTH Collectibles & Memorabilia Ltd | Wholesale & retail | 2025 |
| Jtr(Bournemouth) Ltd | Transport & logistics | 2016 |
| Jtsc Limited | Information & communication | 2021 |
| Juber Consultancy Limited | Information & communication | 2021 |
| Julia's World Kitchen Ltd | Hospitality | 2024 |
| Julian Places Invest Ltd | Real estate | 2026 |
| Julian Terrace Freehold Limited | Households | 2016 |
| Julie Forsyth Limited | Professional & scientific | 2016 |
| Julyan Enterprises Ltd | Real estate | 2026 |
| Jump 32 Limited | Information & communication | 2016 |
| Jump Finance Ltd | Financial services | 2020 |
| Jump Leasing Ltd | Administrative & support | 2023 |
| June Communications Limited | Information & communication | 2014 |
| June Developments Limited | Real estate | 1960 |
| Jungle House Cafe (Bournemouth) Ltd | Hospitality | 2024 |
| JUNIORD3 Ltd | Information & communication | 2025 |
| Juniper Films Limited | Information & communication | 2025 |
| Juniper Tree Catering Limited | Hospitality | 2017 |
| Junkbloom Ltd | Transport & logistics | 2025 |
| Jupiterco Ltd | Wholesale & retail | 2025 |
| Jurado Chiropractic Ltd | Health & social care | 2023 |
| Jurassic Coast Property Limited | Real estate | 2024 |
| Jurassic Fields Festival Ltd | Arts & recreation | 2026 |
| Jurassic Homes Ltd | Real estate | 2018 |
| Jurassic OIL Spill Training Ltd | Education | 2024 |
| Jurassic Real Estate Ltd | Real estate | 2023 |
| Just Buy Ltd | Wholesale & retail | 2025 |
| Just Cleaning Limited | Administrative & support | 2007 |
| Just Comedy Ltd | Other services | 2022 |
| Just Electrical Contractors Ltd | Construction | 2013 |
| Just Envelopes (Europe) Ltd | Manufacturing | 2006 |
| Just Good Music Management Ltd | Arts & recreation | 2020 |
| Just Installations Limited | Administrative & support | 2007 |
| Just NOW South Ltd | Wholesale & retail | 2025 |
| Just Renovate Home Improvements Ltd | Construction | 2024 |
| Just Shutters (Franchise) Ltd | Professional & scientific | 2010 |
| Just Shutters Ltd | Extraterritorial | 2022 |
| Just SO Living Properties Limited | Real estate | 2017 |
| Just Sunshades Ltd | Construction | 2024 |
| Just Wright Homes Limited | Real estate | 2022 |
| Just Wright TOO Limited | Real estate | 2019 |
| JUST1SWAP Ltd | Wholesale & retail | 2019 |
| Justaddgenius.Com Limited | Information & communication | 2001 |
| Jutland Limited | Construction | 1998 |
| Juxie Limited | Wholesale & retail | 2020 |
| JV Building Services Dorset Ltd | Construction | 2020 |
| JV Jointing Limited | Construction | 2024 |
| JV Management Solutions Ltd | Professional & scientific | 2024 |
| JW & SB Consulting Ltd | Professional & scientific | 2014 |
| JWM Advanced Solutions Limited | Manufacturing | 2017 |
| JWS Properties Limited | Real estate | 2016 |
| JYM Roofing Limited | Construction | 2022 |
| Jyro Scaffolding Limited | Construction | 2017 |
| JYU JI UK Ltd | Hospitality | 2025 |
| K & M Roofing Southern Limited | Construction | 2020 |
| K &a Hospitality Ltd | Hospitality | 2022 |
| K Bunsik Ltd | Hospitality | 2024 |
| K Cavity Wall Extractions Ltd | Construction | 2026 |
| K D M Window Cleaning Ltd | Administrative & support | 2014 |
| K FOX Consultancy Limited | Professional & scientific | 2019 |
| K Freeman Ltd | Manufacturing | 2022 |
| K K Builders ( Dorset) Limited | Construction | 2010 |
| K M L Construct Ltd | Construction | 2026 |
| K Property Rent Ltd | Real estate | 2025 |
| K Reed & Sons Ltd | Transport & logistics | 2014 |
| K S Northbourne Limited | Hospitality | 2021 |
| K W Parking Limited | Other services | 2023 |
| K&K Christchurch Limited | Wholesale & retail | 2024 |
| K&K Kitchen Limited | Hospitality | 2016 |
| K-Bay Limited | Wholesale & retail | 2003 |
| K. D. Lamination and Repairs Ltd | Professional & scientific | 2021 |
| K.A.R Cleaning Ltd | Administrative & support | 2025 |
| K.A.R Pharma Limited | Wholesale & retail | 2022 |
| K.A.Z Dental Ltd | Health & social care | 2021 |
| K.B. Sales Ltd. | Manufacturing | 2003 |
| K.W. Engineering (Poole) Limited | Manufacturing | 1983 |
| K1SUMMIT CIC | Health & social care | 2025 |
| K2 Reliable Ltd | Transport & logistics | 2015 |
| K2 Services Group Ltd | Administrative & support | 2025 |
| K4A Fire & Safety Ltd | Professional & scientific | 2023 |
| K8 SKO Limited | Information & communication | 2011 |
| KA Appliance Limited | Other services | 2018 |
| Kaal Logistics Ltd | Transport & logistics | 2024 |
| Kaba Accounting Solutions Ltd | Professional & scientific | 2017 |
| Kaba Sushi Limited | Hospitality | 2023 |
| Kadi Garage Ltd | Wholesale & retail | 2020 |
| Kadila Limited | Other services | 2013 |
| Kadin Properties Limited | Real estate | 2019 |
| Kadir Property Enterprises Ltd | Real estate | 2024 |
| Kahasolutions Limited | Information & communication | 2010 |
| Kahwati Roasters Ltd | Manufacturing | 2019 |
| KAI Residential Limited | Real estate | 2026 |
| Kairos Ideas Limited | Information & communication | 2016 |
| KAL Entertainment Ltd | Arts & recreation | 2025 |
| KAL Logisticss Limited | Transport & logistics | 2024 |
| Kaleidoscope (Bournemouth) Limited | Wholesale & retail | 2004 |
| Kalimera GR Ltd | Hospitality | 2025 |
| KAM Venture Ltd | Hospitality | 2020 |