Updated 26 October 2026 · from filed accounts
The biggest software and tech companies in London
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.
- 1
CapitaLondon · Software & tech · FY to Dec 2025
£2.31bn
-4.5% on the year before
- 2
TrainlineLondon · Software & tech · FY to Feb 2026
£453m
+2.4% on the year before
- 3
Sopra SteriaLondon · Software & tech · FY to Dec 2025
£436m
-5.7% on the year before
- 4
Kainos GroupLondon · Software & tech · FY to Mar 2026
£431m
+17% on the year before
- 5Amey Ow
London · Software & tech · FY to Dec 2025
£393m
+5.9% on the year before
- 6
Irobot UKLondon · Software & tech · FY to Dec 2024
£200m
-18% on the year before
- 7
Tide PlatformLondon · Software & tech · FY to Dec 2025
£199m
+12% on the year before
- 8
Sodexo Live UKLondon · Software & tech · FY to Aug 2025
£155m
Turnover
- 9
Alfa Financial Software HoldingsLondon · Software & tech · FY to Dec 2025
£127m
+15% on the year before
- 10Worksome
London · Software & tech · FY to Dec 2025
£125m
+25% on the year before
How this list is made
From each company's latest accounts filed at Companies House, or its annual report for listed groups: the figures as filed, nothing estimated. Changes compare the two latest filed years. Only companies that report in pounds are ranked; groups that report in dollars or euros aren't converted. Subsidiaries whose figures are part of a listed group's are counted once, in the group. Updated daily as new accounts are filed.