| Improving Lives Locally CIC | Education | 2024 |
| Improving Minds C.I.C. | Hospitality | 2021 |
| Improving Your Future CIC | Administrative & support | 2018 |
| Impulse Electrics Ltd | Construction | 2016 |
| Impulse Productions Limited | Information & communication | 2000 |
| Impulse Professional Services Ltd | Real estate | 2019 |
| Impulse Systems Limited | Information & communication | 1982 |
| Imran Healthcare Ltd | Administrative & support | 2017 |
| Imran Housing Ltd | Real estate | 2025 |
| Imran Jabar Limited | Health & social care | 2019 |
| Imran Masood Limited | Health & social care | 2012 |
| Imran Property Holdings Limited | Real estate | 2014 |
| Imran Securiety Services Ltd | Administrative & support | 2025 |
| Imran Stall Limited | Wholesale & retail | 2026 |
| Imran Yasin Construction Ltd | Construction | 2024 |
| Imranj Transport Ltd | Transport & logistics | 2026 |
| Imrankhalil Limited | Transport & logistics | 2025 |
| Imre Banana Limited | Arts & recreation | 2024 |
| Imre Varadi Sports Management Limited | Arts & recreation | 2017 |
| IMS Consulting Services Limited | Professional & scientific | 2019 |
| IMS Couriers Ltd | Administrative & support | 2020 |
| Imsb Limited | Wholesale & retail | 2022 |
| Imsha Ltd | Real estate | 2024 |
| Imsolver Ltd | Information & communication | 2025 |
| Imtech Aqua Maintenance Ltd | Construction | 1991 |
| Imtiaz & Sons Properties Ltd | Real estate | 2025 |
| Imtiaz Hussain Studio Ltd | Wholesale & retail | 2024 |
| Imullance Ltd | Wholesale & retail | 2022 |
| Imultichannel Ltd | Other services | 2020 |
| IMV Flooring UK Ltd | Manufacturing | 2020 |
| IMV Motors Ltd | Wholesale & retail | 2020 |
| IMZ Developments Limited | Real estate | 2026 |
| IMZ Forwarding Limited | Transport & logistics | 2025 |
| IMZ Limited | Wholesale & retail | 2009 |
| Imzora Ltd | Wholesale & retail | 2026 |
| IN a Nutshell Antiques & Interiors Limited | Wholesale & retail | 2015 |
| IN a Nutshell Collectables & Curios Online Limited | Wholesale & retail | 2016 |
| IN Bloom (2006) Limited | Wholesale & retail | 2006 |
| IN Bocca DI Lupo Limited | Hospitality | 2017 |
| IN Car Telematics Limited | Wholesale & retail | 2016 |
| IN Deep Geek Limited | Information & communication | 2019 |
| IN Harmony Limited | Health & social care | 2013 |
| IN HER Shoes Birmingham CIC | Education | 2019 |
| IN Hour Services Limited | Health & social care | 2004 |
| IN House Concierge Limited | Administrative & support | 2019 |
| IN Leaps & Bounds Limited | Real estate | 2024 |
| IN Line Drywall Ltd | Construction | 2016 |
| IN Property Developments Limited | Real estate | 2018 |
| IN Retirement Services (Reversions) Limited | Financial services | 2003 |
| IN Safe Hands Community Care Services Limited | Health & social care | 2014 |
| IN Stitches Solihull Ltd | Other services | 2024 |
| IN Supreme Housing Limited | Real estate | 2025 |
| IN the Woods Nursery Ltd | Health & social care | 2017 |
| IN Time Developments Ltd | Construction | 2022 |
| IN Time Networks Limited | Information & communication | 2021 |
| IN Unity WE Rise C.I.C. | Education | 2025 |
| IN Your Element Spa Room Ltd | Other services | 2022 |
| IN- Stitches Clothes TEC Limited | Administrative & support | 2017 |
| In-Bowl Limited | Hospitality | 2025 |
| In-Car Cleverness Limited | Extraterritorial | 2008 |
| In-Charge Solutions Limited | Wholesale & retail | 2008 |
| In-House Cadtraining Ltd | Professional & scientific | 2018 |
| In-Tegrate Ltd | Information & communication | 2025 |
| IN2 Education Services Ltd | Education | 2018 |
| IN2PRODUCTIONS Limited | Hospitality | 2023 |
| Inafoods Ltd | Hospitality | 2025 |
| Inajamac Ltd | Information & communication | 2023 |
| Inam Traders Ltd | Wholesale & retail | 2026 |
| Inanjo Ltd | Other services | 2025 |
| Inara Health Ltd | Wholesale & retail | 2025 |
| Inaru Ltd | Other services | 2025 |
| Inavi Consulting Ltd | Professional & scientific | 2025 |
| Inavi Holdings Ltd | Professional & scientific | 2025 |
| Inaya Properties Ltd | Real estate | 2020 |
| Inayah Daycare Limited | Education | 2015 |
| Inayat Pharma Limited | Health & social care | 2022 |
| Inayat Sarwar ( Birmingham ) Limited | Health & social care | 2023 |
| Inbound Safety Services Ltd. | Wholesale & retail | 2017 |
| Inc Associates Limited | Real estate | 2017 |
| Ince House Limited | Professional & scientific | 2002 |
| Inception Capital 18 PTY Ltd | Real estate | 2019 |
| Incispida Limited | Arts & recreation | 2017 |
| Inciti Limited | Real estate | 2010 |
| Incloud IT Limited | Real estate | 2017 |
| Inclusive Attendance International Ltd | Education | 2024 |
| Inclusive Attendance Ltd | Education | 2023 |
| Inclusive Innovation Ltd | Administrative & support | 2024 |
| Inclusive Next Steps CIC | Arts & recreation | 2015 |
| Inclusive Quality Services Ltd | Real estate | 2025 |
| Inclusive Start Ltd | Education | 2024 |
| Inclusive Waves Swim School CIC | Education | 2026 |
| Inclyne Estates Ltd | Households | 2024 |
| Incoherent Limited | Real estate | 2020 |
| Inconvenient Limited | Information & communication | 2024 |
| Incorporated Inc. Ltd | Arts & recreation | 2023 |
| Incrayo Services Limited | Information & communication | 2025 |
| Incredible SHE Ltd | Wholesale & retail | 2024 |
| Incredible Surplus CIC | Hospitality | 2014 |
| Incredose Limited | Administrative & support | 2025 |
| Inddes Ltd | Manufacturing | 2015 |