| Gloucestershire Primary Tutors Limited | Education | 2020 |
| Glympton Estates Limited | Professional & scientific | 1997 |
| Glympton Farms Limited | Agriculture & fishing | 1989 |
| Gold Star Recruitment Ltd | Administrative & support | 2009 |
| Green Gables Guest House Limited | Hospitality | 2015 |
| Green Lane (Southern) Limited | Real estate | 2017 |
| Guillain and Guillain Limited | Arts & recreation | 2015 |
| Hannah H.G. Artist Ltd | Arts & recreation | 2024 |
| Hare Property Services Ltd | Real estate | 2023 |
| Hare Style UK Limited | Other services | 2021 |
| Hare Witney Limited | Other services | 2016 |
| Harris & Harris London Limited | Professional & scientific | 2014 |
| HCW Heating & Plumbing Limited | Construction | 2023 |
| Heights Performance Ltd | Extraterritorial | 2024 |
| Henley Property Developments Limited | Administrative & support | 2003 |
| Henley Property Holdings Limited | Administrative & support | 1999 |
| Henson & Webb Ltd | Real estate | 2026 |
| HG Plant Hire Ltd | Administrative & support | 2025 |
| HMK Accountancy Ltd | Professional & scientific | 2019 |
| Hollowback Media Limited | Information & communication | 2014 |
| Home Farm Close (Bladon) Management Company Limited | Real estate | 2016 |
| Home Sweet Home Soft Furnishings Limited | Wholesale & retail | 2002 |
| Homestead England Limited | Wholesale & retail | 2026 |
| Hourhost Limited | Information & communication | 2023 |
| Idea to Shelf Limited | Administrative & support | 2012 |
| Illeso Digital Ltd | Information & communication | 2023 |
| Illeso Ltd | Public administration | 2020 |
| Ilmer Lucas Terrier Club Ltd | Other services | 2013 |
| Ilumina Ltd. | Administrative & support | 2011 |
| Impact RI Limited | Information & communication | 2014 |
| Indulge Media UK Limited | Information & communication | 2016 |
| Infinity Education (Holdings) Limited | Information & communication | 2025 |
| Infinity Education Ltd | Information & communication | 1994 |
| Insight Retail Advisory Limited | Professional & scientific | 2025 |
| Instinctive Aviation Ltd | Professional & scientific | 2016 |
| Insuwall Solutions Limited | Construction | 2025 |
| Iona House Gallery Limited | Wholesale & retail | 2006 |
| Ioonline Ltd | Wholesale & retail | 2020 |
| IS Oxford Design Limited | Professional & scientific | 1984 |
| IS Oxford Employee Ownership Trustee Limited | Extraterritorial | 2016 |
| IS Oxford Limited | Information & communication | 1979 |
| Iterative Impact Ltd | Information & communication | 2025 |
| IXN Ltd | Information & communication | 2022 |
| J B Consulting & Imports Ltd | Professional & scientific | 2020 |
| J F K (Witney) Limited | Construction | 1997 |
| J. a. PYE (Oxford) Limited | Construction | 1957 |
| J.A. PYE (Oxford) Estates Limited | Construction | 1973 |
| JAB Aero Limited | Transport & logistics | 2026 |
| Jate-Well Limited | Real estate | 2021 |
| John Francome Enterprises Limited | Other services | 1977 |
| Jonathan Bargus Ltd | Arts & recreation | 2017 |
| Jonathan Whetter Consulting Limited | Professional & scientific | 2024 |
| JR LVT Flooring Ltd | Administrative & support | 2016 |
| Julian Dalton Limited | Construction | 2002 |
| Justin Howard Elias Ltd | Administrative & support | 2020 |
| Jxn.Co Ltd | Information & communication | 2022 |
| K622 Tech Ltd | Information & communication | 2018 |
| Karen East Business Services Ltd | Administrative & support | 2017 |
| Karros Ltd | Wholesale & retail | 2020 |
| Kbdr Limited | Professional & scientific | 2011 |
| Keith Bailey & Co.(Travel)Limited | Real estate | 1966 |
| Keracycle Ltd | Professional & scientific | 2026 |
| Kerchung! Limited | Manufacturing | 2022 |
| Keys in OUR Hands Limited | Households | 2020 |
| Killingworth Castle Inn Ltd | Hospitality | 2026 |
| Kingham Property Services Limited | Construction | 1994 |
| Kinyard Group Ltd | Real estate | 2024 |
| Kiwy PCN Limited | Health & social care | 2023 |
| KOA Works Limited | Wholesale & retail | 2024 |
| KWC PUB Ltd | Hospitality | 2023 |
| L Maybury Home Limited | Wholesale & retail | 2022 |
| L Morris Properties (Oxford) Limited | Real estate | 2022 |
| L&R Horticulture Limited | Administrative & support | 2021 |
| Landed Capital Ltd | Real estate | 2019 |
| Langley Property Investment (Walthamstow) Limited | Administrative & support | 2011 |
| Langley Property Investment Limited | Administrative & support | 2011 |
| Langley Property Trading (Walthamstow) Limited | Administrative & support | 2011 |
| Langley Property Trading Limited | Administrative & support | 2011 |
| Latent Data Ltd | Information & communication | 2022 |
| Layers Custom Parts Ltd | Manufacturing | 2025 |
| Lee-Tuely Winery Limited | Manufacturing | 2026 |
| Levo Group Holdings Limited | Financial services | 2025 |
| Levo Group Limited | Professional & scientific | 2022 |
| Lewisfield Way (Woodstock) Flats Management Company Limited | Real estate | 2011 |
| Libby RAK Jewellery Ltd | Manufacturing | 2021 |
| Lincoln Grove Management Company Limited | Real estate | 2007 |
| Little Beginnings Ltd | Professional & scientific | 2021 |
| Local Community Homes Ltd | Construction | 2019 |
| London Political Risk Analysis Ltd | Professional & scientific | 2025 |
| Long Close Residents Limited | Households | 2020 |
| Love Water Limited | Administrative & support | 2004 |
| Lovelace Ventures Ltd | Professional & scientific | 2020 |
| Loxwood Partners Limited | Information & communication | 2020 |
| Lucas Terrier Club Ltd | Agriculture & fishing | 2012 |
| Luxury Lovers Limited | Wholesale & retail | 2022 |
| M a Gibson Limited | Construction | 2003 |
| M B Carpets Limited | Wholesale & retail | 2009 |
| Make Noise Ltd | Arts & recreation | 2013 |
| Manor London Limited | Administrative & support | 2009 |
| Manor Oxford Ltd | Real estate | 2020 |