| Ipswich Food Store Ltd | Wholesale & retail | 2024 |
| Ipswich Foot Clinic Limited | Health & social care | 2013 |
| Ipswich Fryery Ltd | Hospitality | 2026 |
| Ipswich Funeral Directors Limited | Other services | 2014 |
| Ipswich Furniture Project | Wholesale & retail | 2004 |
| Ipswich Gardening Excellence Ltd | Professional & scientific | 2024 |
| Ipswich GAS Limited | Construction | 2020 |
| Ipswich Glass Ltd | Manufacturing | 2005 |
| Ipswich Golf Centre Ltd | Arts & recreation | 2009 |
| Ipswich Golf Club Limited | Hospitality | 2016 |
| Ipswich Hair and Beauty Products Ltd | Other services | 2021 |
| Ipswich Happy Shoppers Limited | Wholesale & retail | 2022 |
| Ipswich Historic Churches Trust(The) | Arts & recreation | 1979 |
| Ipswich Homes Limited | Extraterritorial | 1998 |
| Ipswich Housing Action Group Limited | Hospitality | 2004 |
| Ipswich Hydraulics Limited | Manufacturing | 1978 |
| Ipswich Interior Repair Ltd | Wholesale & retail | 2026 |
| Ipswich Itec Services Limited | Professional & scientific | 1990 |
| Ipswich Kiosk and Events Ltd | Hospitality | 2023 |
| Ipswich Kurdish Islamic Cultural Centre Ltd | Other services | 2011 |
| Ipswich Lettings Ltd | Real estate | 2025 |
| Ipswich Linen Limited | Other services | 2023 |
| Ipswich Lock & Safe Limited | Wholesale & retail | 2008 |
| Ipswich Marina Towers Limited | Real estate | 2024 |
| Ipswich Maritime Trust Limited | Education | 1983 |
| Ipswich Mart Ltd | Wholesale & retail | 2026 |
| Ipswich Masonic Hall Limited | Other services | 1995 |
| Ipswich Masonic Trust Company Limited | Other services | 1995 |
| Ipswich Mediterranean Foods Ltd | Wholesale & retail | 2022 |
| Ipswich Migle Ltd | Wholesale & retail | 2019 |
| Ipswich Mill Investments Limited | Real estate | 2024 |
| Ipswich Mint Hand Car Wash Ltd | Other services | 2022 |
| Ipswich Model Engineering Society Limited | Other services | 2016 |
| Ipswich Mortgage Centre Limited | Financial services | 2014 |
| Ipswich MOT Centre Limited | Wholesale & retail | 2020 |
| Ipswich Noodle Bar Ltd | Hospitality | 2019 |
| Ipswich Pizza Shop Ltd | Hospitality | 2025 |
| Ipswich Plant Services Ltd | Construction | 2015 |
| Ipswich Plastics Limited | Wholesale & retail | 1973 |
| Ipswich Plumb Store Ltd | Wholesale & retail | 2020 |
| Ipswich Pro Tiling Ltd | Construction | 2019 |
| Ipswich Railway Modellers Association Limited | Other services | 2024 |
| Ipswich Ripple Community Interest Company | Other services | 2006 |
| Ipswich Romanian Community CIC | Professional & scientific | 2023 |
| Ipswich Roofing Limited | Extraterritorial | 2003 |
| Ipswich School Corporate Trustee Limited | Education | 2022 |
| Ipswich School Enterprises Limited | Arts & recreation | 2000 |
| Ipswich Security & Fire Ltd | Administrative & support | 2023 |
| Ipswich Self Store Ltd | Transport & logistics | 2012 |
| Ipswich Services Limited | Administrative & support | 1985 |
| Ipswich Smart Repair Ltd | Wholesale & retail | 2026 |
| Ipswich Sports Club 2020 Ltd | Arts & recreation | 2019 |
| Ipswich Sports Club Padel Limited | Arts & recreation | 2024 |
| Ipswich Sports Club Services Limited | Real estate | 2016 |
| Ipswich Station Hotel Ltd | Hospitality | 2019 |
| Ipswich Stores Ltd | Wholesale & retail | 2020 |
| Ipswich Suffolk Ltd | Hospitality | 2025 |
| Ipswich Surgery Services Limited | Administrative & support | 2010 |
| Ipswich Taxi Travel Ltd | Transport & logistics | 2021 |
| Ipswich Timber Frame Limited | Manufacturing | 2006 |
| Ipswich Town Foundation | Arts & recreation | 2014 |
| Ipswich Town PLC | Arts & recreation | 2003 |
| Ipswich Town Property Company Limited | Arts & recreation | 2002 |
| Ipswich Town Women’S Football Club Limited | Arts & recreation | 2025 |
| Ipswich Trade Centre Ltd | Wholesale & retail | 2023 |
| Ipswich Trade Frames Limited | Construction | 2003 |
| Ipswich Transport Museum Services Limited | Wholesale & retail | 1993 |
| Ipswich Trichology Limited | Other services | 2011 |
| Ipswich Truck Services Limited | Wholesale & retail | 2005 |
| Ipswich Tuition Centre Ltd | Education | 2025 |
| Ipswich Turf Ltd | Wholesale & retail | 2003 |
| Ipswich Turkish Barbers Ltd | Other services | 2025 |
| Ipswich Tyre & Alignment Centre Ltd | Wholesale & retail | 2020 |
| Ipswich Tyre Centre Limited | Wholesale & retail | 1985 |
| Ipswich Tyre Group Limited | Wholesale & retail | 2018 |
| Ipswich UK Limited | Hospitality | 2024 |
| Ipswich Utilities Limited | Water & waste | 2014 |
| Ipswich Vapes Ltd | Wholesale & retail | 2016 |
| Ipswich Vehicle Refinishers (Suffolk) Ltd | Wholesale & retail | 2021 |
| Ipswich Wanderers FC CIC | Arts & recreation | 2023 |
| Ipswich Windows Ltd | Construction | 2012 |
| Ipswich Windrush Society CIC | Education | 2022 |
| Ipswich WOK and Brew Limited | Wholesale & retail | 2025 |
| Ipswich.Love CIC | Professional & scientific | 2023 |
| Ipswichit Limited | Information & communication | 2020 |
| Ipswichmaid Ltd | Administrative & support | 2021 |
| Iqueue Barbers Limited | Manufacturing | 2014 |
| Irieye Ltd | Information & communication | 2022 |
| IRO by Damilola Ltd | Professional & scientific | 2025 |
| Iron Dynamics Ltd | Wholesale & retail | 2024 |
| Iron Rank Coffee Ltd | Wholesale & retail | 2025 |
| Ironbuild Limited | Construction | 2000 |
| Ironglaze Ltd | Construction | 2008 |
| Ironwebdirect.Com Ltd | Information & communication | 2020 |
| Ironwebholdings Ltd | Real estate | 2020 |
| Irvine Bennett Consulting Ltd | Financial services | 2020 |
| Is&C Limited | Health & social care | 2013 |
| Isaac Fabricators 2023 Limited | Manufacturing | 2023 |
| Isantis Group Limited | Wholesale & retail | 2025 |
| ISC Asset Management Ltd | Real estate | 2018 |