| House of Esme Ltd | Wholesale & retail | 2023 |
| House of Talia Limited | Real estate | 2018 |
| Houseclub Ltd | Real estate | 2015 |
| HRJ (Silverdale) Limited | Professional & scientific | 2022 |
| HS Cardiology Ltd | Professional & scientific | 2014 |
| Hscc Limited | Agriculture & fishing | 2014 |
| HSE Advice UK Ltd | Professional & scientific | 2021 |
| Hsse Global Services Ltd | Administrative & support | 2011 |
| HT ALI Barbers Ltd | Other services | 2017 |
| Humble HEN Ltd | Agriculture & fishing | 2025 |
| Hunter Fabrications Limited | Manufacturing | 2012 |
| Hunter Theatre Arts Limited | Arts & recreation | 2025 |
| Hurst Electrical Group Limited | Construction | 2017 |
| Hxndred Ltd | Wholesale & retail | 2016 |
| Hybrid Instruments Limited | Manufacturing | 2003 |
| Hycontainer Ltd | Manufacturing | 2024 |
| Hynds Paint: Home & Business Ltd | Construction | 2025 |
| I.D. Mechanic Ltd | Wholesale & retail | 2026 |
| I.T. Investment (NW) Ltd | Real estate | 2021 |
| Iaap Mart Ltd | Wholesale & retail | 2025 |
| Iacob & SON Limited | Hospitality | 2013 |
| IAM Tanks Limited | Professional & scientific | 2021 |
| Iamatyourdoor Limited | Financial services | 2017 |
| IAN Proctor Plastering Limited | Construction | 2007 |
| Iasis Limited | Health & social care | 2018 |
| Icon Conservatories Windows & Doors Ltd | Construction | 2026 |
| ICS (1973) Limited | Information & communication | 2007 |
| ICS (2084) Limited | Mining & quarrying | 2007 |
| ICS (Contractors) Ltd | Extraterritorial | 2007 |
| ICS Accountants Ltd | Administrative & support | 2017 |
| ICS Accounting Ltd | Professional & scientific | 2009 |
| ICS Contracting Group Ltd | Professional & scientific | 2009 |
| ICS Directors Limited | Administrative & support | 2002 |
| ICS Nominees Limited | Administrative & support | 2002 |
| ICS Secretaries Limited | Other services | 2002 |
| ICS Umbrella Ltd | Other services | 2002 |
| ICT Reverse Asset Management Limited | Water & waste | 2003 |
| Ideal AI Limited | Manufacturing | 2021 |
| IF Give Ltd | Information & communication | 2022 |
| Ighk Limited | Hospitality | 2019 |
| Iglooo Ltd | Manufacturing | 2005 |
| Ignite Heating Services (NW) Limited | Construction | 2019 |
| Illustries Ltd | Wholesale & retail | 2010 |
| Illyria Building Services Limited | Construction | 2019 |
| Imageon Limited | Wholesale & retail | 1999 |
| Imend.Com Global Limited | Information & communication | 2014 |
| Imitating the Dog Limited | Extraterritorial | 2008 |
| Imitating the Dog Productions Limited | Information & communication | 2024 |
| Improved Performance Limited | Information & communication | 2020 |
| IN Touch Alarms Limited | Health & social care | 2006 |
| Incandescence Couture Limited | Wholesale & retail | 2015 |
| Inclusive Property Management Limited | Real estate | 2020 |
| Incoming Enquiries Ltd | Information & communication | 2022 |
| Independent Contractor Services Limited | Administrative & support | 2002 |
| Independent Divinely Inspired Limited | Information & communication | 2020 |
| Independent Entertainment Ltd | Information & communication | 2018 |
| Indian Food Store Limited | Manufacturing | 2018 |
| Indian Kitchen Lancaster Ltd | Hospitality | 2019 |
| Industry Warehouse Limited | Education | 2024 |
| Infinite Illusion Films Limited | Construction | 2021 |
| Infinity Pre-School Ltd | Education | 2015 |
| Infinity Properties North West Ltd | Real estate | 2023 |
| INFINITY3 Ltd | Information & communication | 2020 |
| Infocusav Limited | Information & communication | 2018 |
| Ingleborough Group Ltd | Professional & scientific | 2025 |
| Ingleborough Hall Ltd | Real estate | 2025 |
| INK Terminal Ltd | Other services | 2021 |
| Innov@Tive IT Limited | Information & communication | 2008 |
| Innoviation Ltd | Manufacturing | 2025 |
| Insightbridge Solutions Limited | Professional & scientific | 2025 |
| Insitufloor Ltd | Construction | 2010 |
| Inspire Academy of Dance Events Limited | Arts & recreation | 2023 |
| Inspire Academy of Dance Limited | Arts & recreation | 2023 |
| Inspire Academy of Dance Surrey Limited | Arts & recreation | 2023 |
| Inspire Academy of Dance West Sussex Limited | Arts & recreation | 2023 |
| Inspire Dance Academy Limited | Arts & recreation | 2025 |
| Inspire Dance Deeping Limited | Arts & recreation | 2025 |
| Inspire Dance Studio Copthorne Ltd | Education | 2017 |
| Inspiring Community Action Limited | Administrative & support | 2024 |
| Instantly Digital Solutions Ltd | Information & communication | 2019 |
| Insurance Data Migrations Limited | Extraterritorial | 2009 |
| Intack Auto Services Limited | Wholesale & retail | 2025 |
| Intack Holdings Limited | Financial services | 2023 |
| Intack Property Developments Limited | Construction | 2023 |
| Intelligent Internet Limited | Information & communication | 2008 |
| Intense Productions Ltd. | Information & communication | 1999 |
| Interact School of Performing Arts Ltd | Arts & recreation | 2020 |
| Interact Workshops Ltd | Health & social care | 2023 |
| International Dyslexia Learning Solutions Limited | Education | 2013 |
| Into the Wild Limited | Hospitality | 2020 |
| Into the Wild Play Limited | Manufacturing | 2025 |
| Invespa Ltd | Real estate | 2025 |
| Invisible Comb Limited | Information & communication | 2017 |
| Invox Ltd | Professional & scientific | 2025 |
| Inza Limited | Real estate | 2011 |
| IOA Consults Limited | Professional & scientific | 2007 |
| Iraqi Cultural Centre Ltd | Education | 2022 |
| Irish Sea RIM Ltd | Professional & scientific | 2025 |
| Ironrose Systems Ltd | Information & communication | 2025 |
| Isaac Ventures Ltd | Information & communication | 2025 |