Brief your market
Who could bid the next time Security Industry Authority tenders for it services — from published contract awards, not directories. A tender that reaches more proven suppliers gets more bids; more bids is the evidence of value for money.
Ring 1
Proven with you
Suppliers already holding a published Security Industry Authority award in this category.
- Softcat plc2 awards · latest Jul 2025
SIA 916 - Internet Content Filtering Service
- PricewaterhouseCoopers LLP2 awards · latest Jul 2024
SIA 874 - IT Managed Detection and Response Solution 2024
- Access UK LTD2 awards · latest Sept 2020
Access SelectHR License including migration to Cloud
- CAPGEMINI UK PLC1 award · latest May 2026
SIA 941 - Design, Build & Support of Martyn's Law Regulatory Digital Service
- Nominet1 award · latest Jul 2025
SIA 906 - PSN & DNS Core Services 2025
- PEOPLESAFE LIMITED1 award · latest Jul 2024
SIA 830 - Lone Worker Mobile Application 2023
- Actica Consulting Ltd1 award · latest Jun 2024
Business Continuity Review Services
- Bytes Software Services Limited1 award · latest Apr 2024
iBase Software and Support
- Insight Direct Limited1 award · latest Sept 2020
iBase Software and Support
- Phoenix Software Limited1 award · latest Sept 2020
TOPdesk enterprise platform
Showing 10 of 11.
Ring 2
Proven with buyers like you
Suppliers who have won this category with other Other buyers — ranked by how many different buyers they've won with. This is the shortlist that widens your field.
- Softcat plc 245 awards · 75 buyers · latest Jul 2026
Purchase of Druva Licenses
- insight Direct (UK) Ltd114 awards · 44 buyers · latest Jul 2026
GB-London: Physical Server Hosting
- Deloitte Llp74 awards · 38 buyers · latest Jul 2026
GB-Norwich: Digital Operating Model and Workforce Strategy (HR)
- Phoenix Software Limited52 awards · 37 buyers · latest Jul 2026
Cloud Security Products
- Specialist Computer Centres plc78 awards · 31 buyers · latest Jun 2026
Netbackup / Infoscale Licenses
- Phoenix Software Ltd51 awards · 31 buyers · latest Dec 2025
DDaT25355 - Security Software Consultancy Requirement
- Microsoft Limited51 awards · 31 buyers · latest Jul 2026
Provision of Microsoft Unified Enterprise Support Services
- Capgemini Uk Plc84 awards · 30 buyers · latest Jul 2026
VAT PDF and CAS Proxy Service
- CDW Limited42 awards · 30 buyers · latest Jun 2026
Network Review and Assistance
- Civica Uk Limited46 awards · 28 buyers · latest Feb 2026
Online Migration and Portal Enhancement Services 2025-26
Showing 10 of 5,964.
Ring 3
Proven in the field
Suppliers winning this category anywhere in UK public procurement (excluding those already listed above).
- boxxe Limited128 awards · 68 buyers · latest Jul 2026
ENHT - ClinicalVision Renewal
- Trustmarque Solutions Limited97 awards · 62 buyers · latest Jun 2026
Microsoft Azure Licenced Solution Provider 2026
- Oracle Corporation Uk Limited116 awards · 60 buyers · latest May 2026
Oracle Professional Services
- Kpmg Llp149 awards · 58 buyers · latest Jul 2026
Business Consultancy Services
- British Telecommunications plc74 awards · 55 buyers · latest Feb 2026
Zscaler Renewal
- IBM United kingdom limited107 awards · 52 buyers · latest Jun 2026
Instana licences 2026/27
- Kainos Software Limited106 awards · 50 buyers · latest Jul 2026
"Airlock" Output Checking System OCS Decision Engine Development Partner
- Gartner UK limited71 awards · 50 buyers · latest Jun 2026
Executive Program CIO Membership
- Cgi It Uk Limited95 awards · 47 buyers · latest Jul 2026
Strategic Data Partner
- NEC Software Solutions UK Limited60 awards · 47 buyers · latest Jan 2026
GIS Mapping Software
Showing 10 of 13,189.
The full list — for members
All 5,964 Other suppliers in ring 2 (capped at 400, widest-proven first), copyable as a spreadsheet — so every proven supplier can hear about your next tender, not just the usual three.
Sources: published UK contract award notices in the rfp.quest corpus. “Proven” means a citable award — nothing here is inferred or scraped from directories. Award values are not summed because framework ceilings would inflate them.