# The biggest software and tech companies in London

The software and tech companies registered in London with the highest turnover in their latest filed accounts, ranked, with profit and growth.

Capita is the biggest company among the software and tech companies registered in London by turnover, with £2.31bn in its latest filed accounts. Trainline and Sopra Steria follow. Together the 10 companies below turned over £4.83bn in their latest filed years.

| Rank | Company | Town | Turnover | Year |
| ---: | --- | --- | ---: | --- |
| 1 | [Capita](https://firmfacts.co/company/capita-02081330) | London | £2.31bn | FY to Dec 2025 |
| 2 | [Trainline](https://firmfacts.co/company/trainline-11961132) | London | £453m | FY to Feb 2026 |
| 3 | [Sopra Steria](https://firmfacts.co/company/sopra-steria-04077975) | London | £436m | FY to Dec 2025 |
| 4 | [Kainos Group](https://firmfacts.co/company/kainos-group-09579188) | London | £431m | FY to Mar 2026 |
| 5 | [Amey Ow](https://firmfacts.co/company/amey-ow-01922327) | London | £393m | FY to Dec 2025 |
| 6 | [Irobot UK](https://firmfacts.co/company/irobot-uk-10785183) | London | £200m | FY to Dec 2024 |
| 7 | [Tide Platform](https://firmfacts.co/company/tide-platform-09595646) | London | £199m | FY to Dec 2025 |
| 8 | [Sodexo Live UK](https://firmfacts.co/company/sodexo-live-uk-14270762) | London | £155m | FY to Aug 2025 |
| 9 | [Alfa Financial Software Holdings](https://firmfacts.co/company/alfa-financial-software-holdings-10713517) | London | £127m | FY to Dec 2025 |
| 10 | [Worksome](https://firmfacts.co/company/worksome-11615731) | London | £125m | FY to Dec 2025 |

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Updated 2026-10-26 from the latest filed accounts at Companies House (Open Government Licence v3.0). Page: https://firmfacts.co/blog/biggest-software-and-tech-companies-in-london