| Juliet Daye Consulting Ltd | Professional & scientific | 2013 |
| Juliet Hardick Solicitors Limited | Professional & scientific | 2014 |
| Juliet Taylor Design Limited | Professional & scientific | 1998 |
| Jumboflexi Limited | Construction | 1987 |
| Jump Baby Ltd | Wholesale & retail | 2016 |
| Jump SW LLP | | 2023 |
| Jungle House Ltd | Information & communication | 2017 |
| Juniper and Thyme Limited | Professional & scientific | 2017 |
| Juniper Gardens Bath Residents Company Limited | Professional & scientific | 1987 |
| Juniper Properties Investment Company Limited | Real estate | 2020 |
| Junipers Creative Play Limited | Education | 2007 |
| Juno Bath Limited | Hospitality | 2015 |
| Junsei Capital Limited | Wholesale & retail | 2015 |
| Just ASK Hugo Ltd | Other services | 2023 |
| Just Carpentry Limited | Manufacturing | 2006 |
| Just Jags Limited | Wholesale & retail | 1995 |
| Just Wine Limited | Information & communication | 2004 |
| Justine Gover Consulting Ltd | Professional & scientific | 2008 |
| Justmewellbeing Ltd | Extraterritorial | 2024 |
| JVG Management Company Ltd | Extraterritorial | 2016 |
| Jwmg Ventures Ltd | Administrative & support | 2019 |
| K Fraser Textiles Limited | Wholesale & retail | 2014 |
| K J COX Limited | Construction | 2021 |
| K J Foster Building Ltd | Construction | 2025 |
| K W P Property Maintenance Limited | Real estate | 1998 |
| K&A TCG Limited | Wholesale & retail | 2025 |
| K&I Transfers Limited | Transport & logistics | 2022 |
| K.I.G. Construction Limited | Construction | 1987 |
| K2 Installation Services Ltd | Construction | 2014 |
| KA Hill Ltd | Wholesale & retail | 2024 |
| Kaffeen Ltd | Wholesale & retail | 2018 |
| Kaikoura (Swansea) Limited | Real estate | 2000 |
| Kaikoura Investments Limited | Real estate | 1996 |
| Kairn Holding Limited | Manufacturing | 2018 |
| Kairos Carbon Limited | Professional & scientific | 2024 |
| Kaliyoga Europe Limited | Arts & recreation | 2020 |
| Kalmm Solutions Limited | Professional & scientific | 2016 |
| Kalmynji Cottages Ltd | Real estate | 2020 |
| Kamath Medical Services Ltd | Health & social care | 2012 |
| Kambiz Limited | Hospitality | 1988 |
| Kamy Enterprises Ltd | Financial services | 2023 |
| Kandy Apps Ltd | Information & communication | 2023 |
| Kapa Consulting Limited | Extraterritorial | 2019 |
| Kapsule Collection Limited | Health & social care | 2025 |
| Kara Education Ltd | Education | 2025 |
| Karasu Ltd | Information & communication | 2026 |
| Karibu Box Limited | Wholesale & retail | 2020 |
| Karnak Digital Ltd | Professional & scientific | 2026 |
| Kartho Enterprise Ltd | Health & social care | 2018 |
| Kartho Holdings Limited | Health & social care | 2020 |
| Karuna Training Ltd | Health & social care | 2022 |
| Kasumai Ltd | Information & communication | 2022 |
| Kate Garden Health Ltd | Health & social care | 2024 |
| Katherine Raderecht Consultancy Limited | Administrative & support | 2014 |
| Katherine Shields Private Staff Ltd | Administrative & support | 2020 |
| Kathryns Cabin Homes and Lettings Limited | Real estate | 2025 |
| Katie Mullally Ltd | Wholesale & retail | 2015 |
| Katlas Analysis Limited | Information & communication | 2025 |
| Katol Property Ltd | Real estate | 2018 |
| Katy Smart Consultancy Ltd | Professional & scientific | 2025 |
| KAY Design London Ltd | Extraterritorial | 2014 |
| KB Global Services Ltd | Wholesale & retail | 2015 |
| Kbvyse Ltd | Information & communication | 2019 |
| KC Construction Management (Bath) Ltd | Professional & scientific | 2017 |
| KCS Investments Limited | Financial services | 2018 |
| KDB Connections Ltd | Professional & scientific | 2014 |
| KDD Theatre Staffing Limited | Health & social care | 2024 |
| Keeper Clothes Limited | Wholesale & retail | 2023 |
| Kellanet Limited | Information & communication | 2022 |
| Kellard Leadership Services Ltd | Professional & scientific | 2025 |
| Kellard Property Limited | Real estate | 2015 |
| Kelly Jones Limited | Professional & scientific | 2016 |
| Kelly Kilduff Limited | Professional & scientific | 2003 |
| Kelly Marie Kitchen Interiors Limited | Professional & scientific | 2018 |
| Kelly Marie Properties Limited | Real estate | 2019 |
| Kelly Meade Limited | Other services | 2015 |
| Kelly's Animal Therapy CIC | Other services | 2024 |
| Kelso Place Management (Bath) Limited | Households | 1990 |
| Kelson Maintenance Ltd | Construction | 2021 |
| Kelston Farms Limited | Agriculture & fishing | 2018 |
| Kelston House Residents Management Company Limited | Households | 2021 |
| Kelston Knoll Farm Limited | Agriculture & fishing | 2021 |
| Kelston Knoll Real Estate Limited | Construction | 2016 |
| Kelston Parks Limited | Administrative & support | 2011 |
| Kelston Research Limited | Professional & scientific | 1985 |
| Kelston Tump LLP | | 2010 |
| Kelvin Hawkins Limited | Construction | 2008 |
| Kemble Flyers Ltd | Transport & logistics | 2020 |
| Kendall Consulting Ltd | Administrative & support | 2006 |
| Kenilworth Court (Bath) Management Company Limited | Households | 1990 |
| Kennett Surveys Limited | Professional & scientific | 2008 |
| Kensal Rise Properties Ltd | Real estate | 2024 |
| Kensington Court (Bath) Limited | Households | 1990 |
| Kensington Jones Limited | Administrative & support | 1999 |
| Kent Solar Energy Limited | Professional & scientific | 2020 |
| Kenway Trading Limited | Wholesale & retail | 2013 |
| Keppel & Co Limited | Professional & scientific | 2013 |
| Kerenza Cottages Ltd | Real estate | 2022 |
| KERR2MEDICAL Limited | Health & social care | 2019 |
| Kerry Miles Auto Repairs Ltd | Wholesale & retail | 1998 |