| Interocean Holdings Limited | Financial services | 2023 |
| Interocean Marine Services Limited | Mining & quarrying | 2007 |
| Intersafe Safety Systems (ISS) Limited | Professional & scientific | 2015 |
| Intersect Limited | Professional & scientific | 2016 |
| Interventek SUB Limited | Professional & scientific | 2026 |
| Interventek Subsea Engineering Limited | Professional & scientific | 2014 |
| Intervention and Coiled Tubing Association Limited | Other services | 1994 |
| Intervention Engineering Ltd. | Professional & scientific | 2011 |
| Interwell Limited | Mining & quarrying | 2011 |
| Intmech Ltd | Professional & scientific | 2021 |
| Intmedical Limited | Health & social care | 2020 |
| Intrack Consultants Limited | Professional & scientific | 2001 |
| Intrinsic Safety Limited | Professional & scientific | 2004 |
| Intro Creative Group Ltd | Professional & scientific | 2022 |
| Introspexion Wellbeing Ltd | Professional & scientific | 2024 |
| Invercauld Services Limited | Manufacturing | 2021 |
| Inverflo Design Limited | Professional & scientific | 2025 |
| Inverness First AID School Limited | Health & social care | 2003 |
| Inverted Circus Movement CIC | Arts & recreation | 2025 |
| Inverted: Circus and Pole Fitness Limited | Arts & recreation | 2015 |
| Inverurie Laundry Company Limited | Other services | 2014 |
| Investforfuture Limited | Real estate | 2018 |
| Invigorate IT Ltd | Information & communication | 2011 |
| IO IT Services Ltd | Information & communication | 2019 |
| Ioannou Engineering Consultants Limited | Professional & scientific | 2023 |
| IOI Group Ltd | Manufacturing | 2019 |
| ION Matters Healthtech Solutions Limited | Information & communication | 2023 |
| IP Consulcium Limited | Information & communication | 2025 |
| IPG USA SCO LP | | 2018 |
| Iplanning Limited | Other services | 2007 |
| Iplux Ltd | Real estate | 2010 |
| Iprocessxyz Limited | Professional & scientific | 2015 |
| Iprs (Scotland) Ltd | Health & social care | 2013 |
| IPS (Aberdeen) Limited | Manufacturing | 2017 |
| Ipss (Scotland) Limited | Mining & quarrying | 2021 |
| IPT Global UK Limited | Mining & quarrying | 2025 |
| IQM Limited | Professional & scientific | 2012 |
| Iqra Educator Limited | Education | 2024 |
| IR Power Limited | Professional & scientific | 2023 |
| Irah Limited | Information & communication | 2020 |
| Iran Online Ltd | Wholesale & retail | 2026 |
| Iranian Ltd. | Professional & scientific | 2025 |
| Ironfield Tech Services Ltd | Professional & scientific | 2018 |
| Ironhide Accident Repair Centre Ltd | Manufacturing | 2016 |
| IRV Consultancy Limited | Mining & quarrying | 2016 |
| IS Robertson Landholdings(Moray) | Real estate | 1976 |
| ISA Baba Ltd | Hospitality | 2025 |
| Isaac Granite Homes Limited | Real estate | 2025 |
| Isaac Joinery Services Limited | Construction | 2013 |
| Ises Technical Services Limited | Other services | 2008 |
| Isft Limited | Wholesale & retail | 2009 |
| ISG Freelance Ltd | Professional & scientific | 2023 |
| Isla Seafoods Limited | Wholesale & retail | 2022 |
| Island Drilling Ltd | Mining & quarrying | 2022 |
| Island Offshore Subsea UK Limited | Professional & scientific | 2014 |
| Island Offshore UK Limited | Professional & scientific | 2014 |
| Ismc Chmielewski Ltd | Construction | 2015 |
| ISOL8 (Holdings) Limited | Financial services | 2019 |
| ISOL8 Limited | Mining & quarrying | 2017 |
| Isonova Limited | Professional & scientific | 2008 |
| Ispiro Ltd | Other services | 2019 |
| IST3 UK GP Holding Ltd. | Financial services | 2019 |
| IST3 UK Holding LP | | 2019 |
| Istolexis Limited | Information & communication | 2022 |
| ISW Corporate Limited | Professional & scientific | 2021 |
| IT Central (Scotland) Limited | Other services | 2015 |
| IT Northstar Solutions Ltd | Transport & logistics | 2026 |
| IT STR8 2 U Limited | Information & communication | 2008 |
| It-Worx EOT Limited | Extraterritorial | 2020 |
| It-Worx Solutions Limited | Information & communication | 2010 |
| ITB Competence Assurance Ltd. | Professional & scientific | 2001 |
| Itcc Limited | Information & communication | 2009 |
| Iteco Oilfield Supply UK Limited | Administrative & support | 2008 |
| Itgs Powder Coating Ltd | Manufacturing | 2025 |
| Ithaca Energy (North Sea) PLC | Mining & quarrying | 2018 |
| Ithaca Energy (UK) Limited | Mining & quarrying | 2004 |
| Ithaca Energy Holdings (UK) Limited | Mining & quarrying | 2012 |
| Ithaca Ma(Ns) Limited | Mining & quarrying | 2002 |
| Ithaca Minerals (North Sea) Limited | Mining & quarrying | 2004 |
| ITO Projects U.K. Limited | Professional & scientific | 2022 |
| ITP 4CARS Ltd | Wholesale & retail | 2025 |
| Itracoons Ltd | Education | 2024 |
| ITS a People Business Limited | Professional & scientific | 2014 |
| ITS Egypt Holdings 1, Ltd | Professional & scientific | 2014 |
| ITS Egypt Holdings 2, Ltd | Professional & scientific | 2014 |
| Itsthedc Limited | Information & communication | 2015 |
| Ivaya Engineering Ltd | Professional & scientific | 2023 |
| Ivee Solutions Ltd | Professional & scientific | 2023 |
| Ivers Electrical Ltd | Construction | 2012 |
| Ivory Grace Bridal Limited | Wholesale & retail | 2015 |
| IVY Dyce Limited | Hospitality | 2023 |
| IVY M Properties Ltd | Real estate | 2025 |
| IVY Paterson and Grampian Regional Council | | 1992 |
| Ivygarioch Ltd | Other services | 2022 |
| IWC Interventions Limited | Mining & quarrying | 2007 |
| IWM Communications Ltd | Wholesale & retail | 2018 |
| IWM Safety Engineering Ltd | Professional & scientific | 2009 |
| IWR Limited | Real estate | 2023 |
| Iwsc Ltd | Education | 2023 |
| Iyalode Afrique by Doyen Limited | Wholesale & retail | 2025 |