| Mersey Developments Design and Build Limited | Construction | 2015 |
| Mersey Developments Ltd | Construction | 2025 |
| Mersey Electrical Ltd | Construction | 2018 |
| Mersey Energy Limited | Other services | 2009 |
| Mersey Entertainment - Parties & Events Ltd | Other services | 2018 |
| Mersey Facilities Management Ltd | Administrative & support | 2022 |
| Mersey Fencing Ltd | Construction | 2002 |
| Mersey Ferries Limited | Transport & logistics | 1990 |
| Mersey Fibre Limited | Information & communication | 2024 |
| Mersey Films Productions Ltd | Information & communication | 2021 |
| Mersey Fire Protection Ltd | Public administration | 2022 |
| Mersey Flowers Ltd | Wholesale & retail | 2024 |
| Mersey Foot Care Ltd | Health & social care | 2021 |
| Mersey Forest Foundation | Agriculture & fishing | 2014 |
| Mersey Forwarding Limited | Transport & logistics | 1971 |
| Mersey Glaze Ltd | Construction | 2013 |
| Mersey Grabs Ltd | Construction | 2019 |
| Mersey Group Ltd | Administrative & support | 2023 |
| Mersey Group NW Ltd | Construction | 2025 |
| Mersey Health Limited | Health & social care | 2025 |
| Mersey Healthcare Services Ltd | Health & social care | 2018 |
| Mersey Heritage CIC | Education | 2024 |
| Mersey Holdings Ltd | Real estate | 2021 |
| Mersey Homes Limited | Real estate | 2001 |
| Mersey Hospitality Group Ltd | Hospitality | 2026 |
| Mersey Hospitality Ltd | Hospitality | 2023 |
| Mersey Hospitality Management Limited | Real estate | 2024 |
| Mersey Houses Ltd | Real estate | 2022 |
| Mersey Housing Ltd | Financial services | 2025 |
| Mersey Interiors Ltd | Construction | 2018 |
| Mersey Inventory Ltd | Households | 2022 |
| Mersey Kebab Shop Ltd | Hospitality | 2026 |
| Mersey Key Properties Ltd | Real estate | 2025 |
| Mersey Kitchen Liverpool Ltd | Hospitality | 2025 |
| Mersey Legal Services Ltd | Professional & scientific | 2016 |
| Mersey Leisure Vehicles Limited | Wholesale & retail | 2022 |
| Mersey Light House | Education | 2024 |
| Mersey Lime Exporters Limited | Extraterritorial | 2014 |
| Mersey Lime Limited | Wholesale & retail | 1961 |
| Mersey Living Properties Ltd | Real estate | 2026 |
| Mersey Loans Ltd | Extraterritorial | 2020 |
| Mersey Logistics Ltd | Information & communication | 2012 |
| Mersey Maintenance Group Ltd | Construction | 2026 |
| Mersey Maintenance Solutions Limited | Construction | 2025 |
| Mersey Marine Fenders Ltd | Manufacturing | 2025 |
| Mersey Maritime Limited | Administrative & support | 2002 |
| Mersey Mechanical Ltd | Construction | 2020 |
| Mersey Mindset CIC | Other services | 2025 |
| Mersey Moment Marketing Limited | Professional & scientific | 2025 |
| Mersey Moonshine Ltd | Manufacturing | 2025 |
| Mersey Motors Ltd | Wholesale & retail | 2019 |
| Mersey Move IT Ltd | Water & waste | 2026 |
| Mersey Paradise Clothing Ltd | Wholesale & retail | 2023 |
| Mersey Prime Ltd | Construction | 2020 |
| Mersey Projects Limited | Professional & scientific | 2019 |
| Mersey Properties Ltd | Real estate | 2018 |
| Mersey Property Consultants Ltd | Professional & scientific | 2024 |
| Mersey Property Investments Limited | Real estate | 2023 |
| Mersey Property Solutions Ltd | Real estate | 2026 |
| Mersey Races Limited | Arts & recreation | 2015 |
| Mersey RAW Ltd | Manufacturing | 2022 |
| Mersey Regeneration 1 Limited | Construction | 2019 |
| Mersey Regeneration Construction Services Limited | Construction | 2019 |
| Mersey Regeneration Ltd | Construction | 2016 |
| Mersey Removals Ltd | Transport & logistics | 2025 |
| Mersey Resin Ltd | Construction | 2025 |
| Mersey Road Logistics Limited | Manufacturing | 2020 |
| Mersey ROD Limited | Administrative & support | 2018 |
| Mersey Roofing Limited | Construction | 2012 |
| Mersey Shield Ltd | Administrative & support | 2019 |
| Mersey Shipping & Logistics Limited | Transport & logistics | 2012 |
| Mersey Sky Surveys Ltd | Construction | 2025 |
| Mersey Spirits Group Ltd | Hospitality | 2019 |
| Mersey Sports Medicine Limited | Health & social care | 2013 |
| Mersey Steakhouse Ltd | Hospitality | 2025 |
| Mersey Store Ltd | Transport & logistics | 2023 |
| Mersey Swing C.I.C. | Education | 2014 |
| Mersey Table and Chair Hire Limited | Administrative & support | 2015 |
| Mersey Tape Limited | Manufacturing | 2016 |
| Mersey Thrive Property Investments Ltd | Real estate | 2025 |
| Mersey Thrive Property Trading Ltd | Real estate | 2025 |
| Mersey Tidal One Limited | Construction | 2018 |
| Mersey Travel Solutions Ltd | Transport & logistics | 2026 |
| Mersey Tuning Limited | Wholesale & retail | 2021 |
| Mersey Tyre Wholesale Limited | Wholesale & retail | 2020 |
| Mersey Tyres (NW) Ltd | Wholesale & retail | 2014 |
| Mersey Urology Limited | Health & social care | 2015 |
| Mersey Valley Educational Services Limited | Education | 2025 |
| Mersey Vending Services Limited | Hospitality | 2025 |
| Mersey Vent Plant Ltd | Construction | 2020 |
| Mersey View (Liverpool) Limited | Other services | 2017 |
| Mersey View Learning Trust | Education | 2011 |
| Mersey View Leisure Ltd | Hospitality | 2024 |
| Mersey View Property Limited | Real estate | 2024 |
| Mersey Waste Holdings Limited | Professional & scientific | 1992 |
| Mersey Waste Limited | Extraterritorial | 1999 |
| Mersey Wheel Limited | Transport & logistics | 2000 |
| Mersey Windows Limited | Manufacturing | 2008 |
| Mersey Wrought Iron Limited | Manufacturing | 2014 |
| MERSEY.87 Ltd | Construction | 2026 |