| Infinity Consortium Ltd | Financial services | 2023 |
| Infinity Enterprise Ltd | Real estate | 2022 |
| Infinity GAS Yorkshire Ltd | Construction | 2025 |
| Infinity Gym Ltd | Arts & recreation | 2025 |
| Infinity Hair Design (2020) Limited | Other services | 2020 |
| Infinity Home Interiors Ltd | Manufacturing | 2026 |
| Infinity Homes Yorkshire Ltd | Construction | 2025 |
| Infinity Mobile Detailing Ltd | Wholesale & retail | 2025 |
| Infinity Nutrition Limited | Health & social care | 2015 |
| Infinity Peak Limited | Wholesale & retail | 2023 |
| Infinity Service Solutions Limited | Transport & logistics | 2021 |
| Infinity Techlinks Ltd | Information & communication | 2023 |
| Infinity Ventilation & Engineering Ltd | Professional & scientific | 2020 |
| Infinity Wellbeing CIC | Education | 2025 |
| Infinityx Commerce Ltd | Wholesale & retail | 2025 |
| Infionis Limited | Professional & scientific | 2025 |
| Infistruct Ltd | Manufacturing | 2025 |
| Infocus Digital Media Ltd | Information & communication | 2019 |
| Informatics Management Ltd | Information & communication | 2011 |
| Informatics Services Ltd | Information & communication | 2015 |
| Informatiq Solutions Limited | Information & communication | 2015 |
| Infoslice Ltd | Information & communication | 2024 |
| ING Leeds Ltd | Hospitality | 2024 |
| Ingcrest Ltd | Hospitality | 2023 |
| Ingersoll Rand Overseas Investments I Limited | Professional & scientific | 2022 |
| Ingersoll Rand Overseas Investments II Limited | Professional & scientific | 2022 |
| Ingersoll Rand Overseas Investments III Limited | Professional & scientific | 2022 |
| Ingersoll Rand Overseas Investments IV Limited | Professional & scientific | 2022 |
| Ingersoll Rand Overseas Investments V Limited | Professional & scientific | 2022 |
| Ingersoll Rand UK Acquisition Ltd | Financial services | 2025 |
| Ingersoll Rand UK Holdco II Limited | Financial services | 2024 |
| Ingersoll Rand UK Holdco Limited | Financial services | 2024 |
| Ingham Consultants Ltd | Real estate | 2010 |
| Ingleby Flooring Limited | Wholesale & retail | 2025 |
| Ingo Lettings Ltd | Real estate | 2018 |
| Ingrow Mart Ltd | Wholesale & retail | 2020 |
| Inhouse Services Ltd | Manufacturing | 2023 |
| Injury Rehab Clinic Ltd | Health & social care | 2019 |
| Inkind Ltd | Health & social care | 2025 |
| Inma Growth CIC | Health & social care | 2025 |
| Inn Business Accounting Limited | Professional & scientific | 2003 |
| Inn Churches | Health & social care | 2012 |
| Inn Power Ltd | Hospitality | 2018 |
| Innaya Heritage Jewellery Ltd | Wholesale & retail | 2017 |
| Inncon Ltd | Construction | 2024 |
| Inner Blueprint Academy Ltd | Information & communication | 2026 |
| Inner City Construction 2018 Ltd | Construction | 2018 |
| Innercity Sports Coaching Limited | Education | 2018 |
| Inno the Great Ltd | Transport & logistics | 2019 |
| INNOV8 Architects Limited | Professional & scientific | 2025 |
| INNOVA8IVE Solutions Ltd | Wholesale & retail | 2015 |
| Innovabuild Group Ltd | Construction | 2025 |
| Innovate and Partners Ltd | Wholesale & retail | 2024 |
| Innovate Build Services Ltd | Construction | 2024 |
| Innovation Bedz Ltd | Manufacturing | 2017 |
| Innovation Homes Limited | Construction | 2021 |
| Innovative Hamper Tops Limited | Manufacturing | 2026 |
| Innovative Structural Design Ltd | Construction | 2021 |
| Innovativeit Consultants Limited | Information & communication | 2025 |
| Innscribe UK Limited | Professional & scientific | 2008 |
| Inpk Constructions Ltd | Construction | 2024 |
| Insa Care Limited | Health & social care | 2025 |
| Insaf Fabrics (Bradford) Limited | Wholesale & retail | 2019 |
| Insaf Group Ltd | Wholesale & retail | 2025 |
| Insant Keepsakes Ltd | Wholesale & retail | 2026 |
| Inshallah Meds Ltd | Professional & scientific | 2009 |
| Insideflyer Ltd | Information & communication | 2021 |
| Insight Optical BFD Ltd | Other services | 2015 |
| Insight Psychological Solutions Ltd | Health & social care | 2013 |
| Insightful Courier Services Limited | Transport & logistics | 2022 |
| Insignia Wedding Albums Limited | Arts & recreation | 2013 |
| Inspectas Compliance Ltd | Professional & scientific | 2013 |
| Inspectas Holdings Limited | Financial services | 2022 |
| Inspira Physiotherapy Ltd | Health & social care | 2026 |
| Inspire Academy Limited | Education | 2014 |
| Inspire Images Ltd | Professional & scientific | 2007 |
| Inspire ME Academy Ltd | Education | 2024 |
| Inspire to Support Limited | Hospitality | 2025 |
| Inspired Living Property Group Ltd | Real estate | 2023 |
| Inspired Neighbourhoods C.I.C. | Health & social care | 2009 |
| Inspired Neighbourhoods Charitable Trust Limited | Health & social care | 2017 |
| Inspired Neighbourhoods Housing Trust | Construction | 2018 |
| Instacooling Ltd | Construction | 2018 |
| Instacoolsolutions Ltd | Construction | 2025 |
| Install Techno Limited | Construction | 2017 |
| INSTALLS247 Limited | Construction | 2023 |
| Instant Assistuk Ltd | Transport & logistics | 2010 |
| Instant Boiler Repair 24/7 Ltd | Construction | 2026 |
| Instead Limited | Professional & scientific | 1997 |
| Instec Technologies Limited | Information & communication | 2024 |
| Instyle Commercial Ltd | Administrative & support | 2017 |
| Instyle Creations Ltd | Wholesale & retail | 2026 |
| Instyle Homes Limited | Construction | 2003 |
| INSULAT3D Limited | Other services | 2025 |
| Insurance Solutions UK Ltd | Financial services | 2006 |
| Insuring Made Simple Ltd | Financial services | 2016 |
| Intake Construction Group Limited | Construction | 2024 |
| Intega Systems Limited | Information & communication | 2005 |
| Integral Business Consultancy Ltd | Professional & scientific | 2025 |
| Integral Steel Limited | Other services | 2017 |