- ABS Group
 - City of London - Provider of specialised financial industry software. - ACE Software Solutions
- Merton - Provides straight through processing software solutions.
- Amelia Financial Systems Ltd
- Southwark
- Britannia Software plc
- Lewisham - Supplies software to account for, maintain, and track fixed assets, inventory, and software items using one central database.
- CP Corporate Planning
- Richmond-upon-Thames - Offering corporate planning and financial controlling software.
- Exchange Data International
- City of London - Provides financial software and securities data to brokerages, custodians and fund managers in the investment banking industry.
- Financial Objects@
- Westminster
- Global Operations & Administration Ltd
- City of London - Provides withholding tax software and outsourcing services to financial institutions and corporations worldwide.
- Hill Price Davison
- Wandsworth - Software developer that designs and markets software for the factoring and asset based finance marketplace.
- IDOM Consulting Limited
- City of London - Worldwide IT consulting company specialising in the financial sector. Integrates back-office banking systems into front-end Internet delivery systems.
- LatentZero
- Westminster - Specialising in front and middle office solutions for investment management companies.
- MBA Accounting Software
- Islington - Offers payroll, personnel, and accounts software, plus training and development.
- Omni Accounts
- Kingston-upon-Thames - Offers customisable accounting software for small to medium sized businesses.
- QUANTEC Online
- City of London - Providing quantitative construction and analysis tools to investment professionals throughout the world.
- RAFT International
- City of London - Supplies component-based solutions to the financial services industry, specialising in credit risk, collateral, wealth, and risk management.
- Snow Valley
- Westminster - Software developers for the finance sector.
- Speedwell Derivatives Limited
- City of London - Providing software components for a variety of financial services.
- SyMTec Solutions Ltd.
- City of London - Specialising in financial messaging software.
- Xenomorph Software Ltd
- Merton - Specialising in financial software.
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