| East Sussex County Council | Transport & Logistics | 100 |
| Ministry of Defence | Defence & Security | 77 |
| Post Office Limited | Transport & Logistics | 59 |
| NHS England | Healthcare & Pharma | 53 |
| Newry, Mourne and Down District Council (NMD) | Education & Training | 52 |
| Natural England | Forestry & Wildlife | 48 |
| London Borough of Haringey | Construction & Infrastructure | 45 |
| City & County of Swansea | Construction & Infrastructure | 38 |
| YPO | Construction & Infrastructure | 29 |
| Betsi Cadwaladr University Health Board | Healthcare & Pharma | 28 |
| Scottish Government | IT & Telecom | 28 |
| Caerphilly County Borough Council | Education & Training | 27 |
| Leicester City Council | Education & Training | 27 |
| British Council | Education & Training | 26 |
| NETWORK RAIL INFRASTRUCTURE LIMITED | Transport & Logistics | 26 |
| Chemonics International, Inc. | Transport & Logistics | 25 |
| Newcastle City Council | Construction & Infrastructure | 25 |
| UK Research & Innovation (UKRI) | Construction & Infrastructure | 25 |
| Historic England | Education & Training | 24 |
| University of Strathclyde | Manufacturing & Supply | 24 |
| Durham County Council | Financial & Professional Services | 23 |
| Foreign, Commonwealth and Development Office | Facility Management & Cleaning | 23 |
| NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University NHS Trust) | Healthcare & Pharma | 23 |
| The Mayor and Commonalty and Citizens of the City of London | Construction & Infrastructure | 23 |
| The North Yorkshire Council | Financial & Professional Services | 23 |
| Transport for London | Transport & Logistics | 22 |
| UK Atomic Energy Authority | Energy & Power | 22 |
| Defence Equipment and Support | Defence & Security | 21 |
| Home Office | Defence & Security | 21 |
| Kent County Council | Healthcare & Pharma | 21 |
| Manchester City Council | Sports, Recreation & Events | 21 |
| London Borough of Newham | Transport & Logistics | 20 |
| City of Bradford Metropolitan District Council | Sports, Recreation & Events | 19 |
| Leicestershire County Council | Transport & Logistics | 19 |
| London Borough Of Islington | Facility Management & Cleaning | 19 |
| Science Museum Group | IT & Telecom | 19 |
| The Common Services Agency (more commonly known as Public Services Delivery Scotland) (PSD Scotland) | Healthcare & Pharma | 19 |
| Yorkshire Purchasing Organisation | Healthcare & Pharma | 18 |
| Derbyshire County Council | Healthcare & Pharma | 17 |
| Sheffield City Council | Construction & Infrastructure | 17 |
| United Utilities Water Limited | Water & Environment | 17 |
| COUNTESS OF CHESTER HOSPITAL NHS FOUNDATION TRUST | Healthcare & Pharma | 16 |
| London Borough of Croydon | Healthcare & Pharma | 16 |
| Business Services Organisation Procurement and Logistics Service | Transport & Logistics | 15 |
| Cambridgeshire County Council | Healthcare & Pharma | 15 |
| Coventry City Council | Healthcare & Pharma | 15 |
| Department for Education | Education & Training | 15 |
| Derry City and Strabane District Council | Transport & Logistics | 15 |
| East Riding of Yorkshire Council | Healthcare & Pharma | 15 |
| Foundation Scotland | Water & Environment | 15 |