| Inve-Check Ltd | Financial services | 2024 |
| Invenio Property Limited | Administrative & support | 2006 |
| INVENT7 Technologies Ltd | Information & communication | 2024 |
| Invescopy Limited | Professional & scientific | 2013 |
| Invested Operations Ltd | Professional & scientific | 2023 |
| Investeq Limited | Real estate | 2011 |
| Invictus Solar Ltd | Construction | 2023 |
| Invisible Air Ltd | Transport & logistics | 2023 |
| Invisible Investors Ltd. | Professional & scientific | 2015 |
| Invisible Property Ltd | Real estate | 2023 |
| Ionut Alexandru Ltd | Construction | 2025 |
| Ionut Speed Trans Limited | Transport & logistics | 2020 |
| Iordan Limited | Transport & logistics | 2025 |
| IOT Controls Ltd | Construction | 2012 |
| IP Design Limited | Professional & scientific | 2015 |
| IP Fried Chicken Ltd | Hospitality | 2025 |
| IP Logistics Ltd | Transport & logistics | 2023 |
| IP Telecom (Holdings) Limited | Professional & scientific | 2012 |
| IP Telecom Limited | Professional & scientific | 2000 |
| IP Vehicles Ltd | Wholesale & retail | 2021 |
| IP1 Apartotel Limited | Extraterritorial | 2011 |
| IP2 Holdings Ltd | Professional & scientific | 2020 |
| IP3 Telecom Limited | Information & communication | 2008 |
| Ipco Transport Group Ltd | Transport & logistics | 2018 |
| IPI Estates Ltd | Hospitality | 2018 |
| IPI Homes Vantor Ltd. | Public administration | 2025 |
| IPR Carpentry Ltd | Manufacturing | 2024 |
| IPS Resprays Ltd | Wholesale & retail | 2025 |
| IPS Trading (UK) Limited | Real estate | 2005 |
| Ipserv Direct Services Limited | Professional & scientific | 2018 |
| Ipserv Employers Limited | Professional & scientific | 2022 |
| Ipserv Limited | Professional & scientific | 2017 |
| Ipsiloch Limited | Real estate | 2020 |
| Ipswich 101 Ltd | Hospitality | 2020 |
| Ipswich 34 Ltd | Hospitality | 2025 |
| Ipswich 5 Star Ltd | Wholesale & retail | 2022 |
| Ipswich a Ltd | Other services | 2022 |
| Ipswich Accident Repair Centre Limited | Construction | 2001 |
| Ipswich Accountancy Ltd | Professional & scientific | 2024 |
| Ipswich Accounting Ltd | Professional & scientific | 2011 |
| Ipswich Afro-Caribbean Foods Ltd | Wholesale & retail | 2019 |
| Ipswich Alloy Wheels Ltd | Other services | 2023 |
| Ipswich and District Citizens Advice Bureau | Information & communication | 1997 |
| Ipswich and Suffolk Club Company Limited(The) | Hospitality | 1886 |
| Ipswich and Suffolk Council for Racial Equality | Education | 2002 |
| Ipswich and Suffolk Estate Agents Limited | Real estate | 2016 |
| Ipswich and Suffolk Properties Ltd | Construction | 2016 |
| Ipswich Art & Beauty Studio Limited | Other services | 2016 |
| Ipswich Auto Spares Ltd | Wholesale & retail | 2018 |
| Ipswich Auto Tech Ltd | Wholesale & retail | 2025 |
| Ipswich Barber S Ltd | Other services | 2025 |
| Ipswich Bars Limited | Hospitality | 2021 |
| Ipswich Bazaar Limited | Wholesale & retail | 2024 |
| Ipswich Best Pizza Ltd | Hospitality | 2024 |
| Ipswich Blue Star Limited | Wholesale & retail | 2023 |
| Ipswich Book Festival CIC | Arts & recreation | 2024 |
| Ipswich Borough Assets Developments Limited | Construction | 2020 |
| Ipswich Borough Assets Limited | Real estate | 2016 |
| Ipswich Borough Homes Limited | Extraterritorial | 1998 |
| Ipswich Building Control Limited | Professional & scientific | 1993 |
| Ipswich Building Preservation Trust Limited | Health & social care | 1978 |
| Ipswich Burger Trading Limited | Hospitality | 2019 |
| Ipswich Canteen Cafe Ltd | Hospitality | 2025 |
| Ipswich Car Buyers Limited | Extraterritorial | 2023 |
| Ipswich Car Sales Ltd | Other services | 2026 |
| Ipswich Cardinal Grocery Ltd | Wholesale & retail | 2019 |
| Ipswich Central Limited | Extraterritorial | 2020 |
| Ipswich Chamber of Commerce & Industry Limited | Other services | 2006 |
| Ipswich Chicago Pizza Ltd | Hospitality | 2023 |
| Ipswich Chiro Clinic Limited | Health & social care | 2023 |
| Ipswich Chiropody Service Ltd. | Health & social care | 2002 |
| Ipswich Cleaning Services Ltd | Administrative & support | 2016 |
| Ipswich Clutch Centre Limited | Wholesale & retail | 2015 |
| Ipswich Codfather Ltd | Hospitality | 2016 |
| Ipswich Codfellas Limited | Hospitality | 2020 |
| Ipswich Coffee Limited | Hospitality | 2018 |
| Ipswich Commercial Assets Ltd | Real estate | 2018 |
| Ipswich Community Church | Other services | 2005 |
| Ipswich Community Media CIC | Education | 2015 |
| Ipswich Community Radio C.I.C. | Information & communication | 2004 |
| Ipswich Construction & Landscapes Ltd | Construction | 2021 |
| Ipswich Contractors Ltd | Construction | 2024 |
| Ipswich Contracts Limited | Professional & scientific | 1985 |
| Ipswich Counselling & Psychotherapy Services Ltd | Health & social care | 2019 |
| Ipswich Daily Shawarma Ltd | Hospitality | 2024 |
| Ipswich Decorators Ltd | Construction | 2024 |
| Ipswich Digital Ltd | Information & communication | 2023 |
| Ipswich Driving School Ltd | Education | 2002 |
| Ipswich DRY Cleaners Ltd | Other services | 2016 |
| Ipswich Education Limited | Education | 2017 |
| Ipswich Elite Cars Ltd | Wholesale & retail | 2025 |
| Ipswich Elite Tyre Ltd | Manufacturing | 2024 |
| Ipswich Engineering Company Limited | Construction | 2001 |
| Ipswich Fabrications Limited | Manufacturing | 2018 |
| Ipswich Family Supermarket Ltd | Wholesale & retail | 2024 |
| Ipswich Fast Food Ltd | Hospitality | 2024 |
| Ipswich Film Theatre Trust | Information & communication | 2009 |
| Ipswich Finance Company Limited | Administrative & support | 1987 |
| Ipswich Fireplace Centre Ltd | Manufacturing | 2008 |
| Ipswich Firewood Ltd | Agriculture & fishing | 2022 |