| Espo | Other | 1 | £10m | 22.9% | 2022-07-06 |
| CIRRUS PURCHASING LTDNew | Other | 1 | £10m | 21.9% | 2025-08-27 |
| The Guinness Partnership Ltd | Other | 1 | £3m | 7.6% | 2019-08-21 |
| UK SHARED BUSINESS SERVICES LIMITED | Other | 35 | £3m | 7.0% | 2024-10-01 |
| Department of Health and Social Care (DHSC) | Other | 42 | £3m | 6.8% | 2023-06-28 |
| Competition and Markets Authority | Other | 5 | £2m | 3.9% | 2025-05-19 |
| Hyde Housing Association | Other | 1 | £2m | 3.7% | 2018-10-14 |
| BANK OF ENGLAND | Other | 5 | £971k | 2.1% | 2023-06-02 |
| Nottingham Trent University | Other | 1 | £920k | 2.0% | 2019-10-07 |
| The Water Services Regulation Authority | Other | 12 | £841k | 1.8% | 2022-04-13 |
| UK INFRASTRUCTURE BANK LIMITED | Other | 2 | £800k | 1.8% | 2022-08-31 |
| O F W A T | Other | 8 | £635k | 1.4% | 2026-02-27 |
| Parliamentary and Health Service Ombudsman | Other | 2 | £561k | 1.2% | 2022-01-05 |
| Stevenage Borough Council - Department Of Community Services | Other | 1 | £538k | 1.2% | 2016-02-25 |
| Homes England (the name adopted by the Homes and Communities Agency) | Other | 7 | £530k | 1.2% | 2022-11-28 |
| Great Places Housing Group | Other | 4 | £497k | 1.1% | 2022-11-21 |
| Vehicle Certification Agency | Other | 1 | £423k | 0.9% | 2020-07-20 |
| MCA - Maritime and Coastguard Agency | Other | 8 | £418k | 0.9% | 2026-02-09 |
| CPSNew | Other | 1 | £376k | 0.8% | 2024-09-23 |
| Greater Manchester Combined Authority - Greater Manchester Police | Other | 1 | £360k | 0.8% | 2022-05-11 |
| Department for Culture, Media and Sport | Other | 5 | £338k | 0.7% | 2022-08-15 |
| British Business Bank | Other | 4 | £266k | 0.6% | 2022-11-23 |
| Department of Health & Social Care | Other | 4 | £263k | 0.6% | 2024-01-02 |
| Medicines and Healthcare Products Regulatory Agency | Other | 2 | £241k | 0.5% | 2026-01-08 |
| Intellectual Property Office | Other | 1 | £217k | 0.5% | 2022-03-23 |
| THE UNIVERSITY OF BIRMINGHAM | Other | 6 | £215k | 0.5% | 2021-11-10 |
| UK Health Security Agency | Other | 3 | £214k | 0.5% | 2022-04-27 |
| Nottingham City Council | Other | 1 | £188k | 0.4% | 2023-03-31 |
| National Employment Savings Trust (NEST) | Other | 2 | £175k | 0.4% | 2021-06-28 |
| RESTORATION AND RENEWAL DELIVERY AUTHORITY LTD | Other | 1 | £150k | 0.3% | 2021-03-26 |
| Foreign Commonwealth and Development Office | Other | 1 | £125k | 0.3% | 2022-09-23 |
| HM Revenue & Customs | Other | 2 | £120k | 0.3% | 2019-01-15 |
| Crown Commercial Service | Other | 4 | £118k | 0.3% | 2024-03-22 |
| H M REVENUE & CUSTOMS | Other | 2 | £96k | 0.2% | 2024-02-27 |
| Home Office | Other | 1 | £86k | 0.2% | 2018-11-09 |
| Oldham Council | Other | 1 | £82k | 0.2% | 2023-05-31 |
| Cabinet Office | Other | 2 | £80k | 0.2% | 2021-12-20 |
| NHS Property Services LimitedNew | Other | 1 | £80k | 0.2% | 2026-03-16 |
| Northumbria University Newcastle | Other | 1 | £67k | 0.1% | 2020-04-21 |
| Offshore Renewable Energy Catapult | Other | 3 | £67k | 0.1% | 2021-04-27 |
| University Of The West Of EnglandNew | Other | 1 | £65k | 0.1% | 2026-02-25 |
| National Audit Office | Other | 1 | £60k | 0.1% | 2021-05-03 |
| Isle of Wight Council | Other | 1 | £60k | 0.1% | 2022-09-09 |
| Harborough District Council | Other | 1 | £54k | 0.1% | 2020-11-10 |
| The National Archives | Other | 2 | £54k | 0.1% | 2025-12-01 |
| The Office for Standards in Education, Children's Services and SkillsNew | Other | 2 | £50k | 0.1% | 2026-04-01 |
| DVSA - Driver and Vehicle Standards AgencyNew | Other | 1 | £45k | 0.1% | 2025-02-12 |
| The Arts Council of EnglandNew | Other | 2 | £45k | 0.1% | 2026-04-24 |
| Highways Agency | Other | 1 | £40k | 0.1% | 2017-10-05 |
| South Yorkshire Fire and Rescue Service | Other | 1 | £40k | 0.1% | 2022-12-05 |
| National Citizen Service | Other | 1 | £40k | 0.1% | 2019-07-01 |
| Stevenage Borough CouncilNew | Other | 1 | £36k | 0.1% | 2024-05-28 |
| NHS Business Services AuthorityNew | Other | 1 | £34k | 0.1% | 2025-01-29 |
| London Ambulance Service NHS Trust | Other | 1 | £33k | 0.1% | 2022-12-07 |
| Health Education England | Other | 1 | £32k | 0.1% | 2023-03-30 |
| LEEDS TRINITY UNIVERSITY | Other | 1 | £31k | 0.1% | 2024-04-09 |
| THE UNIVERSITY OF CUMBRIA | Other | 1 | £30k | 0.1% | 2024-02-05 |
| FCDO Services | Other | 1 | £29k | 0.1% | 2020-12-31 |
| CENTRE FOR PROCESS INNOVATION LIMITEDNew | Other | 1 | £28k | 0.1% | 2024-11-08 |
| Department for Education | Other | 1 | £25k | 0.1% | 2023-06-21 |
| Office for Students | Other | 1 | £25k | 0.1% | 2021-12-01 |
| Ambulance Radio Programme (ARP) | Other | 1 | £17k | 0.0% | 2019-08-09 |
| SERIOUS FRAUD OFFICE | Other | 1 | £10k | 0.0% | 2023-09-30 |
| Housing 21 | Other | 1 | £1k | 0.0% | 2020-07-06 |
| Equality and Human Rights CommissionNew | Other | 2 | £0k | 0.0% | 2026-02-13 |
| Ministry of Defence | Other | 1 | £0k | 0.0% | 2019-11-18 |
| Transport for Wales Rail Limited (Utility Buyer) | Other | 1 | £0k | 0.0% | |
| Borough Council of Kings Lynn and West Norfolk | Other | 1 | £0k | 0.0% | |
| LIVEWEST HOMES LIMITED | Other | 12 | £0k | 0.0% | |
| HealthTrust Europe LLP (HTE) acting on behalf of | Other | 1 | £0k | 0.0% | |
| Mid and South Essex NHS Foundation Trust | Other | 1 | £0k | 0.0% | |
| Hyde Housing Association Ltd | Other | 1 | £0k | 0.0% | |
| Southern Universities Purchasing Consortium (SUPC) | Other | 1 | £0k | 0.0% | |